Earnings release
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Buenaventura Announces Third Quarter and Nine-Month 2026 Results Lima, Peru, October 29, 2026 – Compañía de Minas Buenaventura S.A.A. (“Buenaventura” or “the Company”) (NYSE: BVN; Lima Stock Exchange: BUE.LM), Peru’s largest publicly-traded precious metals mining company, today announced results for the third quarter (3Q26) and nine months ended September 30, 2026 (9M26). Financial results are prepared in accordance with International Financial Reporting Standards (IFRS), except for certain non -IFRS financial measures identified herein. All amounts are stated in U.S. dollars (US$), unless otherwise indicated. Third Quarter 2026 Highlights: • Direct operations copper production increased by 7% year-over-year (YoY), primarily driven by higher ore throughput at El Brocal. Direct operations gold production decreased by 6% YoY, while equity-attributable gold production, including associated companies, increased by 7% YoY, primarily reflecting a full quarter of operations at nameplate capacity at Coimolache, partially offset by lower production at La Zanja, Orcopampa and Tambomayo. Direct operations silver production decreased by 21 % YoY, primarily due to lower planned silver grades at Yumpag. Lead and zinc production decreased by 1 2% and 1% YoY, respectively, with the decline in lead production primarily reflecting lower grades at Uchucchacua. • 3Q26 EBITDA from direct operations was US$ 261.2 million, compared with US$ 195.3 million reported in 3Q25. EBITDA from direct operations for the first nine months of 2026 was US$ 882.0 million, compared with US$ 434.1 million reported in the corresponding period of 2025. • 3Q26 net income was US$ 268.4 million, compared with US$ 179.0 million reported in 3Q25. Net income for the first nine months of 2026 was US$ 825.4 million, compared with US$ 424.2 million in net income for the corresponding period of 2025. • Processing at San Gabriel remained constrained for most of the quarter as the first phase of reinforcement work on the tailings filtration system was completed. Processing resumed during the final week of September. Additional reinforcement work is planned to be carried out progressively over the next six months. Mining activities continued throughout the quarter, resulting in an ore stockpile of approximately 100,000 metric tons at quarter-end. • Buenaventura reported a cash balance of US$ 1,000.6 million as of September 30, 2026, and negative net debt of US$ 307.3 million, representing a net cash position. The Company’s reported leverage ratio was negative 0.25x. • Buenaventura’s Board of Directors approved a dividend of US$ 0.5508 per share or American Depositary Shares (ADS). Financial Highlights (US$ millions, except earnings per share): 3Q26 3Q25 Var % 9M26 9M25 Var % Total Revenues 545.3 431.0 27% 1,698.9 1,108.2 53% Operating Income 226.4 154.3 47% 777.9 336.1 131% EBITDA Direct Operations (1) 261.2 195.3 34% 882.0 434.1 103% EBITDA Including Affiliates 509.5 338.1 51% 1,534.7 811.4 89% Net Income (2) 268.4 179.0 50% 825.4 424.2 95% EPS (2)(3) 1.06 0.70 50% 3.25 1.67 95% (1) Beginning in 3Q26, the Company revised its EBITDA calculation methodology and restated for comparative figures to present them on a consistent basis. See Appendix 3 for additional information. (2) Total net income for the period. (3) Earnings per share is calculated based on the weighted-average number of shares outstanding during the period. The weighted average number of shares outstanding for the period ended September 30, 2026, was 253,986,867.
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CAPEX CAPEX totaled US$ 97. 4 million in 3Q26, compared with US$ 1 30.7 million in 3Q25. Spending during 3Q26 was primarily allocated to San Gabriel (US$ 43.9 million), El Brocal (US$ 24.7 million) and Uchucchacua/Yumpag (US$ 18.5 million). Operating Revenues Net sales totaled US$ 545.3 million in 3Q26, compared with US$ 431.0 million in 3Q25. The increase was primarily driven by higher realized gold, silver, zinc and copper prices, together with higher copper sales volumes attributable to El Brocal. The Company recorded a negative provisional pricing adjustment of US$ 7.1 million in 3Q26, comprising a US$ 26.8 million negative adjustment related to prior -period liquidations, partially offset by a US$ 19.7 million increase in the fair value of accounts receivables. This compared with a positive provisional pricing adjustment of US$ 18.6 million in 3Q25. Operating Highlights 3Q26 3Q25 % 9M26 9M25 % Net Sales (millions of US$) 545.3 431.0 27% 1,698.9 1,108.2 53% Average Gold Price (US$/oz.) Direct Operations (1)(2) 4,216 3,594 17% 4,475 3,287 36% Average Gold Price (US$/oz.) incl Associated (2)(3) 4,217 3,580 18% 4,470 3,284 36% Average Silver Price (US$/oz.) (1)(2) 57.82 40.81 42% 82.07 36.08 127% Average Lead Price (US$/MT) (1)(2) 1,612 1,903 -15% 1,751 1,892 -7% Average Zinc Price (US$/MT) (1)(2) 3,987 2,811 42% 3,585 2,710 32% Average Copper Price (US$/MT) (1)(2) 15,190 9,989 52% 14,343 9,632 49% Volume Sold 3Q26 3Q25 % 9M26 9M25 % Gold Oz Direct Operations (1) 25,321 28,038 -10% 78,431 78,661 0% Gold Oz incl. Associated (3) 34,891 33,424 4% 105,329 94,018 12% Silver Oz (1) 3,589,290 4,121,632 -13% 10,576,599 11,110,268 -5% Lead MT (1) 3,970 4,586 -13% 11,619 12,341 -6% Zinc MT (1) 5,724 5,973 -4% 17,338 17,266 0% Copper MT (1) 14,821 14,223 4% 41,722 42,481 -2% (1) Buenaventura consolidated figures include 100% of Buenaventura’s operating units, 100% of La Zanja, 100% of El Brocal and 100% of Buenaventura Trading. (2) Realized prices include both provisional sales and final adjustments for price changes. (3) Based on 100% of Buenaventura’s operating units, 100% of La Zanja, 100% of El Brocal, 100% of Buenaventura Trading and 40.094% of Coimolache. Production and Operating Costs • Equity gold production totaled 37,375 ounces in 3Q26, compared with 34,950 ounces in 3Q25. The increase was primarily attributable to higher production at Coimolache, partially offset by lower production at Tambomayo, Orcopampa and La Zanja. • Direct operations silver production totaled 3,209,984 ounces in 3Q26, compared with 4,041,451 ounces in 3Q25. The decrease primarily reflected lower production at Yumpag, El Brocal and Tambomayo. Lead and zinc production decreased by 1 2% and 1% YoY, respectively.
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• Direct operations copper production totaled 8,382 metric tons in 3Q26, compared with 7,902 metric tons in 3Q25, primarily reflecting higher copper production at El Brocal. Equity Production 3Q26 3Q25 % 9M26 9M25 % Gold Oz Direct Operations (1) 27,184 28,953 -6% 84,327 80,277 5% Gold Oz including Associated Companies (2) 37,375 34,950 7% 112,437 96,896 16% Silver Oz Direct Operations (1) 3,209,984 4,041,451 -21% 10,353,308 10,964,140 -6% Silver Oz including Associated Companies (3) 3,435,734 4,247,611 -19% 11,003,204 11,549,596 -5% Lead MT 4,270 4,874 -12% 12,406 13,121 -5% Zinc MT 6,938 6,989 -1% 21,678 20,538 6% Copper MT Direct Operations (1) 8,382 7,902 6% 23,405 23,597 -1% Copper MT including Associated Companies (4) 27,828 28,159 -1% 79,490 81,730 -3% Consolidated Production 3Q26 3Q25 % 9M26 9M25 % Gold Oz (5) 29,009 30,894 -6% 89,556 86,155 4% Silver Oz (5) 3,360,520 4,278,658 -21% 10,881,170 11,520,791 -6% Lead MT (5) 4,270 4,874 -12% 12,406 13,121 -5% Zinc MT (5) 6,938 6,989 -1% 21,678 20,538 6% Copper MT (5) 13,602 12,770 7% 37,975 38,162 0% (1) Buenaventura’s Direct Operations include 100% of Buenaventura’s operating units, 100% of La Zanja and 61.43% of El Brocal. (2) Based on 100% of Buenaventura ’s operating units, 100% of La Zanja, 61.43% of El Brocal and 40.094% of Coimolache. (3) Based on 100% of Buenaventura ’s operating units, 100% of La Zanja, 61.43% of El Brocal, 40.094% of Coimolache and 19.58% of Cerro Verde. (4) Based on 100% of Buenaventura’s operating units, 61.43% of El Brocal and 19.58% of Cerro Verde. (5) Based on 100% of Buenaventura’s operating units, 100% of La Zanja and 100% of El Brocal. Uchucchacua & Yumpag (100% owned by Buenaventura) Production 3Q26 3Q25 Var % 9M26 9M25 Var % Silver - Uchucchacua Oz 565,020 585,095 -3% 1,687,023 1,548,887 9% Silver - Yumpag Oz 1,915,570 2,312,100 -17% 6,319,491 6,742,691 -6% Zinc MT 6,433 6,395 1% 20,419 18,539 10% Lead MT 3,702 4,055 -9% 10,740 10,752 0% Cost Highlights 3Q26 3Q25 Var % 9M26 9M25 Var % Silver CAS US$/Oz 16.61 14.95 11% 21.05 14.25 48% Silver Cash Cost US$/Oz 11.04 9.02 22% 12.06 10.39 16% • Uchucchacua’s 3Q26 silver production decreased by 3% YoY, while Yumpag’s silver production decreased by 17% YoY. The decrease at both units primarily reflected lower silver grades, in line with the mine plan, while higher ore throughput at Uchucchacua partially offset the impact of lower grades. • Silver cash cost increased to US$ 11.04 per ounce in 3Q26 from US$ 9.02 per ounce in 3Q25, primarily due to higher operating costs associated with the continued use of the more selective OCF (Over Cut-and-Fill) mining method at Yumpag, including increased ground support requirements . These ground support efforts are also expected to benefit the
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production of approximately 100 koz of silver in the following quarter. Additional costs were associated with the ongoing transition to an owner-operated mining fleet. This transition involved the onboarding of additional personnel and higher equipment-related costs during implementation. Lower planned silver grades also contributed to the increase. These impacts were partially offset by higher by -product credits, driven by higher zinc prices and lower commercial deductions. The impact of price -based escalators decreased during the quarter, as expected. El Brocal (61.43% owned by Buenaventura) Production 3Q26 3Q25 Var % 9M26 9M25 Var % Copper MT 13,534 12,621 7% 37,775 37,763 0% Silver Oz 390,292 615,004 -37% 1,368,582 1,443,222 -5% Cost Highlights 3Q26 3Q25 Var % 9M26 9M25 Var % Copper CAS US$/MT 6,845 6,074 13% 6,563 6,299 4% Copper Cash Cost US$/MT 5,474 5,273 4% 4,663 5,814 -20% • El Brocal’s 3Q26 copper production increased by 7% YoY, primarily due to higher ore throughput, partially offset by lower copper grades and metallurgical recoveries. The operation achieved a processing rate of 13,500 metric tons per day (tpd) by quarter-end. • Silver production decreased by 37% YoY, primarily reflecting a higher comparative production base in 3Q25, when the operation processed stockpiles with higher precious metals content. • Copper cash cost increased to US$ 5,474 per metric ton in 3Q26 from US$ 5,273 per metric ton in 3Q25, primarily reflecting the higher operating costs associated with increased cement consumption for tailings management, scheduled maintenance activities and the ongoing transition to owner -operated equipment. These factors, together with lower by - product credits, were partially offset by higher payable copper production and lower commercial deductions. San Gabriel (100% owned by Buenaventura) Production 3Q26 3Q25 Var % 9M26 9M25 Var % Gold Oz 599 N.A. N.A. 5,059 N.A. N.A. Cost Highlights 3Q26 3Q25 Var % 9M26 9M25 Var % Gold CAS US$/Oz N.A. N.A. N.A. N.A. N.A. N.A. Gold Cash Cost US$/Oz N.A. N.A. N.A. N.A. N.A. N.A. • San Gabriel continued to ramp up during 3Q26. Gold production totaled 599 ounces, with processing throughput constrained for most of the quarter as the first phase of reinforcement work on the tailings filtration system was completed. Processing resumed during the final week of September, with processing throughput reaching approximately 1,300 tpd by quarter -end. Additional reinforcement work is planned to be carried out progressively, one filter at a time, over the next six months, to support continued ramp -up and address the remaining processing constraint s during the first half of 2027. While processing remained constrained, mining activities continued throughout the quarter, with the mining rate stabilizing at 1,700 tpd by quarter -end, resulting in a n ore stockpile of approximately 100,000 metric tons at quarter-end. • As San Gabriel remains in the ramp -up phase, its unit costs are not yet representative of the operation’s expected steady-state cost profile.
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Coimolache (40.09% owned by Buenaventura) Production 3Q26 3Q25 Var % 9M26 9M25 Var % Gold Oz 25,418 14,958 70% 70,112 41,450 69% Silver Oz 113,074 68,362 65% 336,929 236,850 42% Cost Highlights 3Q26 3Q25 Var % 9M26 9M25 Var % Gold CAS US$/Oz 1,512 1,420 6% 1,458 1,411 3% Gold Cash Cost US$/Oz 1,103 1,405 -21% 970 1,313 -26% • 3Q26 gold production increased by 70% YoY, while silver production increased by 65% YoY, primarily reflecting a full quarter of operations at nameplate capacity, compared with 3Q25, when the mine and leach pad operated at full capacity only during September. • Gold cash cost decreased to US$ 1,103 per ounce in 3Q26 from US$ 1,405 per ounce in 3Q25, primarily due to higher payable gold production and increased by-product credits. Julcani (100% owned by Buenaventura) Production 3Q26 3Q25 Var % 9M26 9M25 Var % Silver Oz 291,370 366,120 -20% 754,835 1,005,561 -25% Gold Oz 3,735 2,452 52% 8,949 6,416 39% Cost Highlights 3Q26 3Q25 Var % 9M26 9M25 Var % Silver CAS US$/Oz 29.34 24.61 19% 41.05 24.51 68% Silver Cash Cost US$/Oz -0.35 13.86 N.A. 5.81 17.21 -66% • 3Q26 silver production decreased by 20% YoY, reflecting a lower contribution from silver - rich zones during the quarter. In contrast, gold production increased by 52% YoY, primarily due to a higher contribution from gold-rich zones. • Silver cash cost decreased to negative US$ 0.35 per ounce in 3Q26 from US$ 13.86 per ounce in 3Q25, primarily due to higher by -product credits associated with the greater contribution from gold -rich zones during the quarter. These credits more than offset operating costs, commercial deductions and selling expenses attributable to silver. Tambomayo (100% owned by Buenaventura) Production 3Q26 3Q25 Var % 9M26 9M25 Var % Gold Oz 4,034 4,954 -19% 10,030 10,973 -9% Silver Oz 182,691 380,818 -52% 703,060 733,392 -4% Cost Highlights 3Q26 3Q25 Var % 9M26 9M25 Var % Gold CAS US$/Oz 3,182 2,762 15% 2,387 2,822 -15% Gold Cash Cost US$/Oz 1,550 1,172 32% -202 2,527 -108% • 3Q26 gold production decreased by 19% YoY and silver production decreased by 52% YoY, primarily due to lower ore throughput consistent with planned lower activity levels. The decline in silver production was further impacted by lower silver grades.
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• Gold cash cost increased to US$ 1,550 per ounce in 3Q26 from US$ 1,172 per ounce in 3Q25, primarily due to the lower production levels recorded during the quarter. Orcopampa (100% owned by Buenaventura) Production 3Q26 3Q25 Var % 9M26 9M25 Var % Gold Oz 12,362 13,314 -7% 41,335 39,878 4% Cost Highlights 3Q26 3Q25 Var % 9M26 9M25 Var % Gold CAS US$/Oz 1,991 1,508 32% 1,720 1,544 11% Gold Cash Cost US$/Oz 2,329 1,879 24% 2,031 1,833 11% • 3Q26 gold production decreased by 7% YoY, primarily due to lower gold grades, partially offset by higher ore throughput. • Gold cash cost increased to US$ 2,329 per ounce in 3Q26 from US$ 1,879 per ounce in 3Q25, primarily due to higher mine development and ground support costs, increased royalties, and lower payable gold production. Share in Associated Companies Buenaventura’s share of net income from associated companies was US$ 134.2 million in 3Q26, compared with US$ 71.1 million in 3Q25, comprising the following contributions: Share in the Result of Associates 3Q26 3Q25 Var % 9M26 9M25 Var % (in millions of US$) Cerro Verde 119.5 63.2 89% 301.5 166.5 81% Coimolache 15.2 8.2 85% 52.1 20.2 158% Other minor -0.4 -0.3 N.A. 1.2 0.3 N.A. Total 134.2 71.1 89% 354.7 187.1 90% Cerro Verde (19.58% owned by Buenaventura) • Copper production at Cerro Verde totaled 99,316 MT, of which 19,446 MT were attributable to Buenaventura. This compared with a total copper production of 103,457 MT in 3Q25, of which 20,257 MT were attributable to Buenaventura. • Cerro Verde reported net income of US$ 608.0 million in 3Q26, compared with US$ 323.9 million in 3Q25. This increase was primarily driven by higher net sales, reflecting a higher average realized copper price of US$ 6.55 per pound in 3Q26, compared with US $ 4.60 per pound in 3Q25, as well as a higher average realized molybdenum price of US$ 31.24 per pound, compared with US$ 22.63 per pound in 3Q25. These impacts were partially offset by lower copper sales volumes. • Capital expenditures at Cerro Verde totaled US$ 90.9 million in 3Q26. Coimolache (40.09% owned by Buenaventura) • Coimolache reported net income of US$ 37.5 million in 3Q26, compared with US$ 20.5 million in 3Q25.
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*** Company Description Compañía de Minas Buenaventura S.A.A. is Peru’s largest publicly traded precious and base metals mining company and a major holder of mining rights in Peru. The Company engages in the exploration, development, mining, processing and sale of gold, silver and base metals through its wholly-owned operations and interests in joint ventures. Buenaventura currently operates several mines in Peru (Orcopampa*, Uchucchacua*, Julcani*, Tambomayo*, La Zanja*, San Gabriel*, El Brocal and Coimolache). The Company holds a 19.58% ownership interest in Sociedad Minera Cerro Verde, a major Peruvian copper producer, alongside Freeport-McMoRan Inc. and Sumitomo Corporation. (*) Wholly owned operations. For a printed copy of the Company’s 2025 Form 20 -F, please contact Investor Relations or download the PDF version from the Company’s website at www.buenaventura.com. Note on Forward-Looking Statements This press release may contain forward-looking statements (as defined in the U.S. Private Securities Litigation Reform Act of 1995) that involve risks and uncertainties. Words such as "anticipate," "believe," "estimate," "expect," "guidance," "intend," "pl an," "project," "target," "will" and similar expressions are intended to identify forward -looking statements. Forward -looking statements include those concerning Compañía de Minas Buenaventura S.A.A.’s (the "Company") and Sociedad Minera Cerro Verde S.A.A.’s production guidance, operating performance, costs and expenses, mine development and ramp -up schedules, results of exploration, improvements in operating efficiency, p revailing market prices of gold, silver, copper and other metals mined, the success of joint ventures, estimates of future exploration, development and production, the Company's and its subsidiaries' plans for capital expenditures and estimates of reserves . These forward-looking statements reflect the Company's current expectations and assumptions regarding its future operating and financial performance and are not guarantees of future performance. Actual results could differ materially from those expressed or implied by the forward-looking statements as a result of these and other risks and uncertainties, including those discussed in the Company's filings with the U.S. Securities and Exchange Commission. Forward-looking statements speak only as of the date of this release, and the Company undertakes no obligation to update or revise them, except as required by applicable law. **Tables to follow**
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APPENDIX 1 Equity Participation in Subsidiaries and Associates (as of September 30, 2026) BVN Operating Equity % Mines / Business El Molle Verde S.A.C* 100.00 Trapiche Project Minera La Zanja S.A* 100.00 La Zanja Sociedad Minera El Brocal S.A.A* 61.43 Colquijica and Marcapunta Compañía Minera Coimolache S.A** 40.09 Tantahuatay Sociedad Minera Cerro Verde S.A.A** 19.58 Cerro Verde Processadora Industrial Rio Seco S.A.C* 100.00 Rio Seco chemical plant Consorcio Energético de Huancavelica S.A* 100.00 Energy – Huanza Hydroelectrical plant Buenaventura Trading SAS* 100.00 Trading (*) Consolidated (**) Equity Accounting APPENDIX 2 Gold Production 15 18 Mining Unit Operating Results Unit 3Q26 3Q25 △% 9M26 9M25 △% Underground Ore Milled DMT 91,602 118,484 -23% 267,353 274,715 -3% Ore Grade Gr/MT 1.74 1.72 1% 1.48 1.60 -7% Recovery Rate % 78.50 75.58 4% 78.97 77.89 1% Ounces Produced Oz 4,034 4,954 -19% 10,030 10,973 -9% Ore Milled DMT 59,632 52,256 14% 170,319 166,809 2% Ore Grade Gr/MT 6.89 8.44 -18% 7.97 7.86 1% Recovery Rate % 93.53 93.84 0% 94.69 94.61 0% Ounces Produced* Oz 12,362 13,314 -7% 41,335 39,878 4% Ore Milled DMT 1,222,449 976,139 25% 3,270,201 3,023,547 8% Ore Grade Gr/MT 0.47 0.57 -18% 0.48 0.56 -15% Recovery Rate % 25.70 28.03 -8% 26.90 27.76 -3% Ounces Produced* Oz 4,731 5,032 -6% 13,557 15,240 -11% Julcani Pb - Ag Ounces Produced Oz 323 205 58% 703 446 58% Julcani Cu - Au Ounces Produced Oz 3,412 2,248 52% 8,246 5,970 38% Ore Milled DMT 7,985 0 N.A. 111,654 0 N.A. Ore Grade Gr/MT 3.53 0.00 N.A. 2.61 0.00 N.A. Recovery Rate % 66.20 0.00 N.A. 53.91 0.00 N.A. Ounces Produced* Oz 599 0 N.A. 5,059 0 N.A. Open Pit La Zanja Ounces Produced Oz 3,547 5,143 -31% 10,625 13,648 -22% Coimolache Ounces Produced Oz 25,418 14,958 70% 70,112 41,450 69% Tambomayo Orcopampa Marcapunta San Gabriel
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Silver Production Mining Unit Operating Results Unit 3Q26 3Q25 △% 9M26 9M25 △% Underground Ore Milled DMT 91,602 118,484 -23% 267,353 274,715 -3% Ore Grade Oz/MT 2.31 3.80 -39% 3.05 3.14 -3% Recovery Rate % 86.45 84.66 2% 86.20 85.02 1% Ounces Produced Oz 182,691 380,818 -52% 703,060 733,392 -4% Ore Milled DMT 59,632 52,256 14% 170,319 166,809 2% Ore Grade Oz/MT 0.09 0.11 -17% 0.09 0.13 -33% Recovery Rate % 58.98 69.03 -15% 61.45 69.76 -12% Ounces Produced Oz 3,227 3,827 -16% 9,253 15,462 -40% Ore Milled DMT 187,159 159,153 18% 511,427 461,238 11% Ore Grade Oz/MT 3.78 4.57 -17% 4.13 4.22 -2% Recovery Rate % 79.76 80.42 -1% 79.83 79.53 0% Ounces Produced Oz 565,020 585,095 -3% 1,687,023 1,548,887 9% Ore Milled DMT 94,385 97,811 -4% 276,854 276,643 0% Ore Grade Oz/MT 21.30 24.84 -14% 23.77 25.56 -7% Recovery Rate % 95.28 95.15 0% 96.02 95.35 1% Ounces Produced Oz 1,915,570 2,312,100 -17% 6,319,491 6,742,691 -6% Ore Milled DMT 17,597 16,433 7% 43,645 43,709 0% Ore Grade Oz/MT 13.55 14.64 -7% 13.17 14.83 -11% Recovery Rate % 96.83 95.91 1% 96.75 96.52 0% Ounces Produced* Oz 230,912 230,802 0% 555,922 625,703 -11% Ore Milled DMT 24,356 22,558 8% 67,224 59,205 14% Ore Grade Oz/MT 2.64 6.20 -57% 3.11 6.61 -53% Recovery Rate % 94.17 96.79 -3% 95.03 97.01 -2% Ounces Produced Oz 60,458 135,318 -55% 198,913 379,859 -48% Ore Milled DMT 1,222,449 976,139 25% 3,270,201 3,023,547 8% Ore Grade Oz/MT 0.58 0.80 -28% 0.60 0.75 -20% Recovery Rate % 55.15 57.53 -4% 55.24 56.37 -2% Ounces Produced Oz 390,292 448,308 -13% 1,085,378 1,276,526 -15% Ore Milled DMT 7,985 0 N.A. 111,654 0 N.A. Ore Grade Oz/MT 4.38 0.00 N.A. 3.66 0.00 N.A. Recovery Rate % 37.37 0.00 N.A. 20.91 0.00 N.A. Ounces Produced* Oz 420 0 N.A. 2,748 0 N.A. Open Pit Ore Milled DMT 0 123,353 -100% 230,690 123,353 87% Ore Grade Oz/MT 0.00 3.50 -100% 3.59 3.50 3% Recovery Rate % 0.00 38.66 -100% 34.22 38.66 -11% Ounces Produced Oz 0 166,696 -100% 283,203 166,696 70% La Zanja Ounces Produced Oz 11,929 15,694 -24% 36,178 31,575 15% Coimolache Ounces Produced Oz 113,074 68,362 65% 336,929 236,850 42% Lead Production Mining Unit Operating Results Unit 3Q26 3Q25 △% 9M26 9M25 △% Underground Ore Milled DMT 91,602 118,484 -23% 267,353 274,715 -3% Ore Grade % 0.58 0.63 -9% 0.54 0.81 -34% Recovery Rate % 86.33 83.36 4% 87.55 84.72 3% MT Produced MT 456 626 -27% 1,259 1,895 -34% Ore Milled DMT 187,159 159,153 18% 511,427 461,238 11% Ore Grade % 2.27 2.80 -19% 2.39 2.57 -7% Recovery Rate % 87.07 91.11 -4% 87.92 90.61 -3% MT Produced MT 3,702 4,055 -9% 10,740 10,752 0% Ore Milled DMT 17,597 16,433 7% 43,645 43,709 0% Ore Grade % 0.68 1.25 -46% 0.98 1.15 -15% Recovery Rate % 93.55 94.15 -1% 94.84 94.38 0% Ounces Produced* MT 112 193 -42% 406 474 -14% Zinc Production Mining Unit Operating Results Unit 3Q26 3Q25 △% 9M26 9M25 △% Underground Ore Milled DMT 91,602 118,484 -23% 267,353 274,715 -3% Ore Grade % 0.87 0.84 3% 0.76 1.08 -29% Recovery Rate % 63.59 59.59 7% 61.86 67.64 -9% MT Produced MT 505 594 -15% 1,259 2,000 -37% Ore Milled DMT 187,159 159,153 18% 511,427 461,238 11% Ore Grade % 3.98 4.68 -15% 4.58 4.63 -1% Recovery Rate % 86.31 85.85 1% 87.21 86.79 0% MT Produced MT 6,433 6,395 1% 20,419 18,539 10% Copper Production Mining Unit Operating Results Unit 3Q26 3Q25 △% 9M26 9M25 △% Underground Ore Milled DMT 1,222,449 976,139 25% 3,270,201 3,023,547 8% Ore Grade % 1.31 1.46 -10% 1.34 1.43 -6% Recovery Rate % 84.65 88.31 -4% 85.97 87.57 -2% MT Produced MT 13,534 12,621 7% 37,775 37,763 0% Julcani Pb - Ag MT Produced MT 33 30 9% 80 76 5% Julcani Cu - Au MT Produced MT 35 96 -63% 120 272 -56% Tambomayo MT Produced MT 0 23 -100% 0 52 -100% Tambomayo Orcopampa Uchucchacua Yumpag Julcani Pb - Ag Julcani Cu - Au Marcapunta San Gabriel Tajo Norte Pb - Zn Tambomayo Uchucchacua Julcani Pb - Ag Tambomayo Uchucchacua Marcapunta
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APPENDIX 3 Cerro Verde’s EBITDA accounts for D&A related to the capitalization of the stripping. Note: Beginning in 3Q26, the Company revised its EBITDA calculation methodology to include workers’ profit sharing and performance-based compensation, which were previously excluded, and restated the comparative figures to present them on a consistent basis. EBITDA (Buenaventura Direct Operations) consists of operating income adjusted for depreciation and amortization and certain non -cash and other operating items, including impairment (reversal) of inventories, provision (reversal) for contingencies, changes in provision for exploration activities, and write-offs and impairments, as applicable. EBITDA (including associated companies) consists of EBITDA (Buenaventura Direct Operations), plus (1) Buenaventura’s equity share of EBITDA (Cerro Verde), plus (2) Buenaventura’s equity share of EBITDA (Coimolache). All EBITDA amounts were similarly calcul ated using financial information provided to Buenaventura by the associated companies. Buenaventura presents EBITDA (Buenaventura Direct Operations) and EBITDA (including associated companies) to provide further information with respect to its operating performance and the operating performance of its associated companies. EBITDA (Buenaventura Direct Operations) and EBITDA (including associated companies) are not measures of financial performance under IFRS and may not be comparable to similarly titled measures of other companies. You should not consider EBITDA (Buenaventura Direct Operations) and EBITDA (including associated companies) as alternatives to operating income or net income determined in accordance with IFRS, as indicators of Buenaventura’s and its associated companies’ operating performance, or as alternatives to cash flows from operating activities. 3Q26 3Q25 9M26 9M25 Operating Income 226,418 154,312 777,868 336,055 Add / Substract: 34,760 41,017 104,175 98,093 Depreciation and amortization in costs of sales 36,801 31,569 99,976 86,986 Impairment (reversal) of inventories (12,152) 6,862 (8,307) 4,879 Depreciation and amortization in administration expenses 410 411 1,227 1,236 Depreciation and amortization in other, net 6 15 32 39 Provision (reversal) for contingencies 2,898 1,075 3,350 752 Changes in provision of exploration activities 4,282 1,085 5,382 1,085 Write-off of fixed assets - - - 3,116 Write-off of accounts receivables 2,515 - 2,515 - Impairment of mill equipment - - - - EBITDA Buenaventura Direct Operations 261,178 195,329 882,043 434,148 EBITDA Cerro Verde (19.58%) 221,123 131,453 567,577 347,961 EBITDA Coimolache (40.095%) 27,182 11,294 85,059 29,296 EBITDA Buenaventura + All Associates 509,484 338,076 1,534,679 811,406 EBITDA (in thousand US$) For the three-month and nine-month periods ended September 30, 2026 and 2025
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APPENDIX 4: COST APPLICABLE TO SALES RECONCILIATION Reconciliation of Costs Applicable to Sales and Cost Applicable to Sales per Unit Sold Cost applicable to sales consists of cost of sales, excluding depreciation and amortization, plus selling expenses. Cost applicable to sales per unit sold for each mine consists of cost applicable to sales for a particular metal produced at a given mine divided by the volume of such metal produced at such mine in the specified period. Cost applicable to sales is not directly comparable to the cash operating cost figures disclosed in the Company’s previous earnings releases. Cost applicable to sales and Cost applicable to sales per unit of mineral sold are not measures of financial performance under IFRS and may not be comparable to similarly titled measures of other companies. The Company considers Cost applicable to sales and Cost applicable to sales per unit of mineral sold to be key measures in managing and evaluating the Company’s operating performance. These measures are widely reported in the precious metals industry as a benchmark for performance, but do not have standardized meanings. You should not consider Cost applicable to sales or Cost applicable to sales per unit of mineral sold as alternatives to cost of sales determined in accordance with IFRS, as indicators of Buenaventura’s operating performance. Cost applicable to sales and Cost applicable to sales per unit of mineral sold are calculated without adjusting for by-product revenue amounts. The tables below set forth (i ) a reconciliation of consolidated Cost of sales, excluding depreciation and amortization to consolidated Cost applicable to sales, (ii) reconciliations of the components of Cost applicable to sales (by mine and mineral) to the corresponding consolidated line items set forth in Buenaventura’s consolidated statements of profit or loss for the three and nine months ended September 30, 2026 and 2025 and (iii) reconciliations of Cost of sales, excluding depreciation and amortization to Cost applicable to sales for each of the Company’s mining units. The amounts set forth in Cost applicable to sales and Cost applicable to sales per unit sold for each mine and mineral indicated in the tables below can be reconciled to the amounts set forth on Buenaventura’s consolidated statements of profit or loss for the three and nine months ended September 30, 2026 and 202 5 by reference to the reconciliations of Cost of sales, excluding depreciation and amortization (by mine and mineral), Selling Expenses (by mine and metal) expenses and Exploration in units in operations (by mine and mineral) to consolidated Cost of sales, excluding depreciation and amortization, consolidated Selling Expenses and consolidated Exploration in units in operations expenses, respectively, set forth below.
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Set forth below is a reconciliation of consolidated Cost of sales, excluding depreciation and amortization, to consolidated Cost applicable to sales: 2026 2025 2026 2025 Consolidated Cost of sales and services excluding depreciation and amortization 220,020 187,354 640,678 531,584 Add: Consolidated Exploration in units in operation 20,261 12,518 54,472 36,231 Consolidated Commercial deductions 20,906 30,412 91,148 86,301 Consolidated Selling expenses 9,333 8,436 24,342 20,284 Consolidated Cost applicable to sales 270,520 238,720 810,640 674,400 Set forth below is a reconciliation of Cost of sales and services, excluding depreciation and amortization (by mine and mineral) to consolidated Cost of sales and services: 2026 2025 2026 2025 Cost of sales by mine and mineral Julcani, Gold 6,651 3,577 13,346 9,890 Julcani, Silver 6,143 6,687 19,974 17,820 Julcani, Lead 47 160 190 426 Julcani, Zinc 0 0 0 0 Julcani, Copper 43 72 74 182 Orcopampa, Gold 21,638 18,626 62,963 57,638 Orcopampa, Silver 107 65 279 268 Orcopampa, Copper 0 0 0 0 Uchucchacua/Yumpag, Gold 0 0 0 0 Uchucchacua/Yumpag, Silver 33,164 30,884 105,835 89,389 Uchucchacua/Yumpag, Lead 1,146 1,994 2,963 6,105 Uchucchacua/Yumpag, Zinc 4,286 4,171 9,470 13,139 Tambomayo, Gold 9,610 11,162 18,445 24,354 Tambomayo, Silver 5,877 9,886 27,516 19,272 Tambomayo, Zinc 362 633 1,506 2,935 Tambomayo, Lead 919 810 660 2,062 Tambomayo, Copper 822 655 1,355 2,088 La Zanja, Gold 7,912 7,582 28,107 27,498 La Zanja, Silver 454 390 2,005 1,498 El Brocal, Gold 3,077 3,825 9,837 12,106 El Brocal, Silver 6,006 8,892 30,963 19,314 El Brocal, Lead 0 0 0 0 El Brocal, Zinc 0 0 0 0 El Brocal, Copper 68,352 48,328 177,222 150,221 San Gabriel, Gold 6,950 0 22,916 0 San Gabriel, Silver 28 0 126 0 Buenaventura Trading, Silver 1,400 846 5,153 2,209 Buenaventura Trading, Copper 33,575 22,900 93,326 64,790 Non Mining Units 1,450 5,210 6,445 8,380 Consolidated Cost of sales, excluding depreciation and amortization 220,020 187,354 640,678 531,584 2026 2025 2026 2025 Exploration expenses in units in operation by mine and mineral Julcani, Gold 1,425 725 3,057 2,318 Julcani, Silver 1,316 1,356 4,575 4,177 Julcani, Lead 10 32 44 100 Julcani, Zinc 0 0 0 0 Julcani, Copper 9 15 17 43 Orcopampa, Gold 2,669 2,032 7,345 4,705 Orcopampa, Silver 13 7 33 22 Orcopampa, Copper 0 0 0 0 Uchucchacua/Yumpag, Gold 0 0 0 0 Uchucchacua/Yumpag, Silver 6,704 4,119 17,425 10,697 Uchucchacua/Yumpag, Lead 232 266 488 731 Uchucchacua/Yumpag, Zinc 866 556 1,559 1,572 Tambomayo, Gold 1,954 725 2,876 1,879 Tambomayo, Silver 1,195 642 4,290 1,487 Tambomayo, Lead 74 41 103 159 Tambomayo, Zinc 187 53 235 226 Tambomayo, Copper 167 43 211 161 La Zanja, Gold 0 0 0 0 La Zanja, Silver 0 0 0 0 El Brocal, Gold 100 119 417 530 El Brocal, Silver 196 278 1,312 846 El Brocal, Lead 0 0 0 0 El Brocal, Zinc 0 0 0 0 El Brocal, Copper 2,231 1,509 7,507 6,579 San Gabriel, Gold 907 0 2,964 0 San Gabriel, Silver 4 0 16 0 Buenaventura Trading, Silver 0 0 0 0 Buenaventura Trading, Copper 0 0 0 0 Non Mining Units 0 0 0 0 Consolidated Exploration expenses in units in operation 20,261 12,518 54,472 36,231 Set forth below is a reconciliation of Commercial Deductions in units in operation (by mine and mineral) to consolidated Commercial deductions: (in thousands of US$) Set forth below is a reconciliation of Exploration expenses in units in operation (by mine and mineral) to consolidated Exploration expenses in mining units: For the 3 months ended September 30 For the 9 months ended September 30 (in thousands of US$) For the 3 months ended September 30 For the 9 months ended September 30 (in thousands of US$) Note: For this calculation, the account Consolidated Cost of Sales and Services Excluding Depreciation and Amortization includes the line items Consolidated Cost of Sales Excluding Depreciation and Amortization, which comprises the costs of both the mining units and Buenaventura Trading, and Consolidated Cost of Services Excluding Depreciation and Amortization. For the 3 months ended September 30 For the 9 months ended September 30
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2026 2025 2026 2025 Commercial Deductions in units in operation by mine and mineral Julcani, Gold -723 38 -1,147 117 Julcani, Silver -210 385 510 770 Julcani, Lead -3 16 -1 29 Julcani, Zinc 0 0 0 0 Julcani, Copper -12 6 -8 10 Orcopampa, Gold 43 -16 164 19 Orcopampa, Silver 1 0 2 0 Orcopampa, Copper 0 0 0 0 Uchucchacua/Yumpag, Gold 0 1 0 1 Uchucchacua/Yumpag, Silver 3,697 4,122 37,965 8,417 Uchucchacua/Yumpag, Lead 268 103 1,307 414 Uchucchacua/Yumpag, Zinc 3,915 833 8,739 1,408 Tambomayo, Gold -135 510 -171 1,233 Tambomayo, Silver -158 635 369 1,191 Tambomayo, Lead -17 30 -25 107 Tambomayo, Zinc 212 286 428 969 Tambomayo, Copper -31 28 -39 95 La Zanja, Gold 10 12 108 85 La Zanja, Silver 1 1 6 4 El Brocal, Gold 555 1,564 2,278 4,846 El Brocal, Silver 1,682 2,403 5,925 6,522 El Brocal, Lead 0 0 0 1 El Brocal, Zinc 0 0 0 -13 El Brocal, Copper 13,446 20,082 39,511 61,434 San Gabriel, Gold 14 0 25 0 San Gabriel, Silver 0 0 0 0 Buenaventura Trading, Silver -68 -22 -251 -45 Buenaventura Trading, Copper -1,581 -603 -4,548 -1,312 Non Mining Units 0 0 0 0 Consolidated Commercial deductions in units in operation 20,906 30,412 91,148 86,301 Set forth below is a reconciliation of Selling expenses (by mine and mineral) to consolidated Selling expenses: 2026 2025 2026 2025 Selling expenses by mine and mineral Julcani, Gold 465 157 883 382 Julcani, Silver 429 294 1,321 688 Julcani, Lead 3 7 13 16 Julcani, Zinc 0 0 0 0 Julcani, Copper 3 3 5 7 Orcopampa, Gold 250 132 746 455 Orcopampa, Silver 1 0 3 2 Orcopampa, Copper 0 0 0 0 Uchucchacua/Yumpag, Gold 0 0 0 0 Uchucchacua/Yumpag, Silver 4,243 3,642 10,878 7,801 Uchucchacua/Yumpag, Lead 147 235 305 533 Uchucchacua/Yumpag, Zinc 548 492 973 1,147 Tambomayo, Gold 458 208 551 327 Tambomayo, Silver 280 185 822 259 Tambomayo, Lead 17 12 20 28 Tambomayo, Zinc 44 15 45 39 Tambomayo, Copper 39 12 40 28 La Zanja, Gold 72 77 253 213 La Zanja, Silver 4 4 18 12 El Brocal, Gold 85 145 288 472 El Brocal, Silver 167 338 907 753 El Brocal, Lead 0 0 0 0 El Brocal, Zinc 0 0 0 0 El Brocal, Copper 1,898 1,838 5,189 5,854 San Gabriel, Gold 16 0 43 0 San Gabriel, Silver 0 0 0 0 Buenaventura Trading, Silver 0 0 0 0 Buenaventura Trading, Copper 0 0 0 0 Non Mining Units 164 637 1,040 1,268 Consolidated Selling expenses 9,333 8,436 24,342 20,284 (in thousands of US$) For the 3 months ended September 30 For the 9 months ended September 30 (in thousands of US$) For the 3 months ended September 30 For the 9 months ended September 30
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GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL Cost of Sales (without D&A) (US$000) 6,651 6,143 47 - 43 12,884 3,577 6,687 160 - 72 10,495 Cost of Sales (without D&A) (US$000) 13,346 19,974 190 - 74 33,584 9,890 17,820 426 - 182 28,318 Add: Add: Exploration Expenses (US$000) 1,425 1,316 10 - 9 2,761 725 1,356 32 - 15 2,128 Exploration Expenses (US$000) 3,057 4,575 44 - 17 7,692 2,318 4,177 100 - 43 6,637 Commercial Deductions (US$000) -723 -210 -3 - -12 -948 38 385 16 - 6 445 Commercial Deductions (US$000) -1,147 510 -1 0 -8 -645 117 770 29 - 10 925 Selling Expenses (US$000) 465 429 3.26 - 3 900 157 294 7 - 3 462 Selling Expenses (US$000) 883 1,321 13 - 5 2,221 382 688 16 - 7 1,094 Cost Applicable to Sales (US$000) 7,819 7,678 57 - 44 15,597 4,497 8,722 216 - 95 13,530 Cost Applicable to Sales (US$000) 16,138 26,379 246 0 88 42,852 12,706 23,455 570 - 242 36,974 Divide: Divide: Volume Sold 3,448 261,716 79 - 14 Not Applicable 2,232 354,445 178 - 16 Not Applicable Volume Sold 8,119 642,601 288 - 22 Not Applicable 5,788 957,142 425 - 37 No Aplicable CAS 2,268 29.34 720 - 3,140 Not Applicable 2,014 24.61 1,217 - 5,981 Not Applicable CAS 1,988 41.05 854 - 3,979 No Applicable 2,195 24.51 1,343 - 6,567 No Applicable GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL Cost of Sales (without D&A) (US$000) 21,638 107 - - - 21,745 18,626 65 - - - 18,691 Cost of Sales (without D&A) (US$000) 62,963 279 - - - 63,242 57,638 268 - - - 57,906 Add: - Add: Exploration Expenses (US$000) 2,669 13 - - - 2,682 2,032 7 - - - 2,039 Exploration Expenses (US$000) 7,345 33 - - - 7,378 4,705 22 - - - 4,727 Commercial Deductions (US$000) 43 1 - - 0 44 -16 -0 - - - -16 Commercial Deductions (US$000) 164 2 - - 0 166 19 -0 - - - 19 Selling Expenses (US$000) 250 1 - - - 251 132 0 - - - 132 Selling Expenses (US$000) 746 3 - - - 749 455 2 - - - 457 Cost Applicable to Sales (US$000) 24,599 122 - - 0 24,722 20,774 72 - - - 20,846 Cost Applicable to Sales (US$000) 71,218 317 - - 0 71,535 62,817 292 - - - 63,109 Divide: Divide: Volume Sold 12,353 3,946 - - - Not Applicable 13,776 4,203 - - - Not Applicable Volume Sold 41,407 10,226 - - - Not Applicable 40,680 17,611 - - - Not Applicable CAS 1,991 31.03 - - - Not Applicable 1,508 17.09 - - - Not Applicable CAS 1,720 30.98 - - - No Applicable 1,544 16.56 - - - No Applicable GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL Cost of Sales (without D&A) (US$000) - 33,164 1,146 4,286 - 38,596 - 30,884 1,994 4,171 - 37,049 Cost of Sales (without D&A) (US$000) - 105,835 2,963 9,470 - 118,268 - 89,389 6,105 13,139 - 108,633 Add: Add: Exploration Expenses (US$000) - 6,704 232 866 - 7,802 - 4,119 266 556 - 4,941 Exploration Expenses (US$000) - 17,425 488 1,559 - 19,472 - 10,697 731 1,572 - 13,000 Commercial Deductions (US$000) - 3,697 268 3,915 - 7,880 1 4,122 103 833 - 5,059 Commercial Deductions (US$000) - 37,965 1,307 8,739 - 48,012 1 8,417 414 1,408 - 10,240 Selling Expenses (US$000) - 4,243 147 548 - 4,938 - 3,642 235 492 - 4,369 Selling Expenses (US$000) - 10,878 305 973 - 12,156 - 7,801 533 1,147 - 9,480 Cost Applicable to Sales (US$000) - 47,807 1,793 9,616 - 59,216 1 42,767 2,598 6,052 - 51,418 Cost Applicable to Sales (US$000) - 172,103 5,063 20,742 - 197,908 1 116,304 7,782 17,265 - 141,353 Divide: - - Divide: Volume Sold 2,877,409 3,561 5,364 - Not Applicable - 2,860,471 3,940 5,563 - Not Applicable Volume Sold - 8,174,740 10,432 16,423 - Not Applicable - 8,162,160 10,427 15,754 - Not Applicable CAS - 16.61 504 1,792 - No Applicable - 14.95 659 1,088 - No Applicable CAS - 21.05 485 1,263 - No Applicable - 14.25 746 1,096 - No Applicable GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL Cost of Sales (without D&A) (US$000) 9,610 5,877 362 919 822 17,590 11,162 9,886 633 810 655 23,146 Cost of Sales (without D&A) (US$000) 18,445 27,516 660 1,506 1,355 49,483 24,354 19,272 2,062 2,935 2,088 50,711 Add: Add: Exploration Expenses (US$000) 1,954 1,195 74 187 167 3,577 725 642 41 53 43 1,504 Exploration Expenses (US$000) 2,876 4,290 103 235 211 7,715 1,879 1,487 159 226 161 3,912 Commercial Deductions (US$000) -135 -158 -17 212 -31 -129 510 635 30 286 28 1,488 Commercial Deductions (US$000) -171 369 -25 428 -39 562 1,233 1,191 107 969 95 3,595 Selling Expenses (US$000) 458 280 17 44 39 838 208 185 12 15 12 432 Selling Expenses (US$000) 551 822 20 45 40 1,478 327 259 28 39 28 681 Cost Applicable to Sales (US$000) 11,887 7,194 436 1,361 998 21,876 12,605 11,348 716 1,163 738 26,570 Cost Applicable to Sales (US$000) 21,702 32,998 757 2,213 1,568 59,238 27,792 22,209 2,356 4,171 2,372 58,899 Divide: Divide: Volume Sold 3,736 164,608 331 359 85 Not Applicable 4,564 347,563 469 409 104 Not Applicable Volume Sold 9,092 626,359 899 914 193 Not Applicable 9,849 663,409 1,489 1,513 283 Not Applicable CAS 3,182 43.71 1,318 3,787 11,705 No Applicable 2,762 32.65 1,528 2,841 7,101 No Applicable CAS 2,387 52.68 843 2,421 8,122 No Applicable 2,822 33.48 1,582 2,757 8,385 Not Applicable GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL Cost of Sales (without D&A) (US$000) 7,912 454 - - - 8,366 7,582 390 - - - 7,972 Cost of Sales (without D&A) (US$000) 28,107 2,005 - - - 30,112 27,498 1,498 - - - 28,996 Add: Add: Exploration Expenses (US$000) - - - - - - - - - - - - Exploration Expenses (US$000) - - - - - - - - - - - - Commercial Deductions (US$000) 10 1 - - - 11 12 1 - - - 13 Commercial Deductions (US$000) 108 6 - - - 114 85 4 - - - 89 Selling Expenses (US$000) 72 4 - - - 76 77 4 - - - 81 Selling Expenses (US$000) 253 18 - - - 271 213 12 - - - 225 Cost Applicable to Sales (US$000) 7,993 459 - - - 8,453 7,671 395 - - - 8,066 Cost Applicable to Sales (US$000) 28,468 2,030 - - - 30,497 27,796 1,514 - - - 29,310 Divide: Divide: Volume Sold 2,392 9,235 - - - Not Applicable 4,910 21,775 - - - Not Applicable Volume Sold 9,555 43,167 - - - Not Applicable 13,877 68,177 - - - Not Applicable CAS 3,342 49.74 - - - Not Applicable 1,562 18.13 - - - Not Applicable CAS 2,979 47.01 - - - No Applicable 2,003 22.20 - - - Not Applicable GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL Cost of Sales (without D&A) (US$000) 3,077 6,006 - - 68,352 77,436 3,825 8,892 - - 48,328 61,045 Cost of Sales (without D&A) (US$000) 9,837 30,963 - - 177,222 218,023 12,106 19,314 - - 150,221 181,641 Add: Add: Exploration Expenses (US$000) 100 196 - - 2,231 2,528 119 278 - - 1,509 1,906 Exploration Expenses (US$000) 417 1,312 - - 7,507 9,235 530 846 - - 6,579 7,955 Commercial Deductions (US$000) 555 1,682 - - 13,446 15,683 1,564 2,403 - - 20,082 24,049 Commercial Deductions (US$000) 2,278 5,925 - - 39,511 47,714 4,846 6,522 1 -13 61,434 72,790 Selling Expenses (US$000) 85 167 - - 1,898 2,150 145 338 - - 1,838 2,322 Selling Expenses (US$000) 288 907 - - 5,189 6,384 472 753 - - 5,854 7,078 Cost Applicable to Sales (US$000) 3,818 8,051 - - 85,928 97,797 5,654 11,911 - - 71,757 89,322 Cost Applicable to Sales (US$000) 12,820 39,107 - - 229,430 281,356 17,954 27,434 1 -13 224,088 269,464 Divide: Divide: Volume Sold 1,974 251,641 - - 12,554 Not Applicable 2,555 513,067 - - 11,813 Not Applicable Volume Sold 5,638 1,015,437 - - 34,956 Not Applicable 8,468 1,182,210 - - 35,577 Not Applicable CAS 1,934 31.99 - - 6,845 Not Applicable 2,213 23.22 - - 6,074 Not Applicable CAS 2,274 38.51 - - 6,563 No Applicable 2,120 23.21 - - 6,299 Not Applicable JULCANI JULCANI 3Q 2026 3Q 2025 9M 2026 9M 2025 ORCOPAMPA ORCOPAMPA 3Q 2026 3Q 2025 9M 2026 9M 2025 UCHUCCHACUA/YUMPAG UCHUCCHACUA/YUMPAG 3Q 2026 3Q 2025 9M 2026 9M 2025 TAMBOMAYO TAMBOMAYO 3Q 2026 3Q 2025 9M 2026 9M 2025 LA ZANJA LA ZANJA 3Q 2026 3Q 2025 9M 2026 9M 2025 BROCAL BROCAL 3Q 2026 3Q 2025 9M 2026 9M 2025
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GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL Cost of Sales (without D&A) (US$000) 6,950 28 - - - 6,978 - - - - - - Cost of Sales (without D&A) (US$000) 22,916 126 - - - 23,042 - - - - - - Add: Add: Exploration Expenses (US$000) 907 4 - - - 911 - - - - - - Exploration Expenses (US$000) 2,964 16 - - - 2,980 - - - - - - Commercial Deductions (US$000) 14 - - - - 14 - - - - - - Commercial Deductions (US$000) 25 - - - - 25 - - - - - - Selling Expenses (US$000) 16 0 - - - 16 - - - - - - Selling Expenses (US$000) 43 0 - - - 43 - - - - - - Cost Applicable to Sales (US$000) 7,887 32 - - - 7,919 - - - - - - Cost Applicable to Sales (US$000) 25,947 143 - - - 26,090 - - - - - - Divide: Divide: Volume Sold 1,418 370 - - - Not Applicable - - - - - Not Applicable Volume Sold 4,621 1,624 - - - Not Applicable - - - - - Not Applicable CAS 5,562 85.97 - - - Not Applicable - - - - - Not Applicable CAS 5,615 87.87 - - - No Applicable - - - - - Not Applicable GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL Cost of Sales (without D&A) (US$000) - 1,400 - - 33,575 34,975 - 846 - - 22,900 23,746 Cost of Sales (without D&A) (US$000) - 5,153 - - 93,326 98,479 - 2,209 - - 64,790 66,999 Add: Add: Exploration Expenses (US$000) - - - - - - - - - - - - Exploration Expenses (US$000) - - - - - - - - - - - - Commercial Deductions (US$000) - -68 - - -1,581 -1,649 - -22 - - -603 -625 Commercial Deductions (US$000) - -251 - - -4,548 -4,800 - -45 - - -1,312 -1,357 Selling Expenses (US$000) - - - - - - - - - - - - Selling Expenses (US$000) - - - - - - - - - - - - Cost Applicable to Sales (US$000) - 1,332 - - 31,994 33,326 - 825 - - 22,296 23,121 Cost Applicable to Sales (US$000) - 4,902 - - 88,778 93,679 - 2,164 - - 63,478 65,642 Divide: Divide: Volume Sold - 20,365 - - 2,168 Not Applicable - 20,108 - - 2,289 Not Applicable Volume Sold - 62,446 - - 6,551 Not Applicable - 59,559 - - 6,584 Not Applicable CAS - 65.41 - - 14,755 Not Applicable - 41.01 - - 9,739 Not Applicable CAS - 78.50 - - 13,551 No Applicable - 36.34 - - 9,641 Not Applicable GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL Cost of Sales (without D&A) (US$000) - - - - - - - - - - - 4,165 Cost of Sales (without D&A) (US$000) - - - - - 3,099 - - - - - 4,888 Cost of Services (without D&A) (US$000) - - - - - 1,450 - - - - - 1,045 Cost of Services (without D&A) (US$000) - - - - - 3,346 - - - - - 3,492 Add: Add: Selling Expenses (US$000) - - - - - 164 - - - - - 637 Selling Expenses (US$000) - - - - - 1,040 - - - - - 1,268 Total (US$000) - - - - - 1,614 - - - - - 5,847 Total (US$000) - - - - - 7,485 - - - - - 9,648 GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL Cost of Sales (without D&A) (US$000) 55,838 51,779 1,555 5,205 69,218 183,595 44,772 56,803 2,788 4,981 49,055 162,563 Cost of Sales (without D&A) (US$000) 155,614 186,699 3,814 10,976 178,651 538,853 131,486 147,561 8,593 16,074 152,491 461,093 Cost of Services (without D&A) (US$000) 1,450 1,045 Cost of Services (without D&A) (US$000) 3,346 3,492 Add: Add: Exploration Expenses (US$000) 7,056 9,428 315 1,053 2,408 20,261 3,602 6,402 340 609 1,566 12,518 Exploration Expenses (US$000) 16,658 27,650 634 1,794 7,735 54,472 9,432 17,228 989 1,799 6,783 36,231 Commercial Deductions (US$000) -236 5,012 248 4,127 13,404 22,554 2,108 7,545 149 1,118 20,116 31,037 Commercial Deductions (US$000) 1,257 44,778 1,281 9,167 39,465 95,947 6,301 16,904 550 2,364 61,539 87,658 Selling Expenses (US$000) 1,345 5,124 167 592 1,940 9,169 720 4,463 254 507 1,854 7,798 Selling Expenses (US$000) 2,763 13,949 337 1,018 5,235 23,302 1,849 9,514 577 1,186 5,889 19,015 Cost Applicable to Sales (US$000) 64,003 71,344 2,285 10,977 86,970 237,193 51,202 75,214 3,531 7,215 72,590 215,598 Cost Applicable to Sales (US$000) 176,293 273,076 6,066 22,956 231,086 716,960 149,067 191,207 10,709 21,423 226,702 608,757 Divide: Divide: Volume Sold 25,321 3,568,925 3,970 5,724 12,653 Not Applicable 28,038 4,101,524 4,586 5,973 11,933 Not Applicable Volume Sold 78,431 10,514,153 11,619 17,338 35,171 Not Applicable 78,661 11,050,709 12,341 17,266 35,896 Not Applicable CAS 2,528 19.99 576 1,918 6,873 Not Applicable 1,826 18.34 770 1,208 6,083 Not Applicable CAS 2,248 25.97 522 1,324 6,570 Not Applicable 1,895 17.30 868 1,241 6,315 Not Applicable GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL GOLD (OZ) SILVER (OZ) LEAD (MT) ZINC (MT) COPPER (MT) TOTAL Cost of Sales (without D&A) (US$000) 33,275 2,151 - - - 35,426 17,863 940 - - - 18,803 Cost of Sales (without D&A) (US$000) 91,297 6,921 - - - 98,218 50,423 3,185 - - - 53,608 Add: Add: Exploration Expenses (US$000) 2,297 148 - - - 2,445 912 48 - - - 960 Exploration Expenses (US$000) 4,866 369 - - - 5,235 2,722 172 - - - 2,894 Commercial Deductions (US$000) 115 6 - - - 121 73 3 - - - 76 Commercial Deductions (US$000) 342 22 - - - 364 241 15 - - - 256 Selling Expenses (US$000) 407 26 - - - 433 230 12 - - - 242 Selling Expenses (US$000) 1,331 101 - - - 1,432 642 41 - - - 683 Cost Applicable to Sales (US$000) 36,094 2,331 - - - 38,425 19,078 1,003 - - - 20,081 Cost Applicable to Sales (US$000) 97,836 7,413 - - - 105,249 54,029 3,412 - - - 57,441 Divide: Divide: Volume Sold 23,868 106,343 - - - Not Applicable 13,433 61,683 - - - Not Applicable Volume Sold 67,088 322,176 - - - Not Applicable 38,302 223,473 - - - Not Applicable CAS 1,512 21.92 - - - Not Applicable 1,420 16.26 - - - Not Applicable CAS 1,458 23.01 - - - No Applicable 1,411 15.27 - - - Not Applicable SAN GABRIEL SAN GABRIEL 3Q 2026 3Q 2025 9M 2026 9M 2025 BUENAVENTURA TRADING BUENAVENTURA TRADING 3Q 2026 3Q 2025 9M 2026 9M 2025 NON MINING COMPANIES NON MINING COMPANIES 3Q 2026 3Q 2025 9M 2026 9M 2025 BUENAVENTURA CONSOLIDATED BUENAVENTURA CONSOLIDATED 3Q 2026 3Q 2025 9M 2026 9M 2025 Note: The calculation of Buenaventura’s Consolidated CAS per metal excludes the effects of Buenaventura Trading and Non-Mining Companies to avoid distorting the analysis. The objective is for this indicator to accurately reflect the CAS of the mining units. COIMOLACHE COIMOLACHE 3Q 2026 3Q 2025 9M 2026 9M 2025
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APPENDIX 5: C1 CASH COST RECONCILIATION Reconciliation of Consolidated Total Cost of Sales to C1 Cash Cost of Mining Units C1 Cash Cost consists of mine site costs of the Company’s mining units, plus mining royalties payable to third parties, commercial deductions and selling expenses, net of by -product credits. Mine site costs start from consolidated total cost of sales, whic h is the most directly comparable measure calculated in accordance with IFRS. The following items are excluded: depreciation and amortization, workers’ profit sharing, the IFRS 16 lease costs , mining royalties, provisions for impairment of inventories, unabsorbed costs due to production stoppage, exploration in operating units, cost of services, and the costs of Buenaventura Trading and non -mining units. The result is then adjusted for changes in inventories. Mining royalties payable to the Peruvian Government are excluded from C1 Cash Cost, while mining royalties payable to third parties are deducted from mine site costs and then included as a separate component of C1 Cash Cost . Other mining companies may exclude all royalties from cash cost measures and include them only in sustaining or all -in sustaining cost measures. C1 Cash Cost does not include sustaining capital expenditures. Commercial deductions are calculated on the volumes produced in the period and therefore differ from those reported in the consolidated statements of profit or loss, which correspond to volumes sold. By -product credits reflect only the payable value of by -product metals and exclude non - payable content. C1 Cash Cost per unit for each mine consists of that mine’s C1 Cash Cost divided by the payable volume of its primary metal produced in the specified period, expressed in US$ per payable ounce for gold and silver and in US$ per payable metric ton for copp er. Because C1 Cash Cost per unit is calculated on payable rather than total production, it may not be comparable to per- unit measures that other companies report on a produced basis. C1 Cash Cost will replace Cost applicable to sales, which the Company will discontinue beginning next quarter. The two measures are not directly comparable. C1 Cash Cost and C1 Cash Cost per unit are not measures of financial performance under IFRS and may not be comparable to similarly titled measures of other companies. The Company considers these measures key in managing and evaluating its operating performance. They are widely reported in the mining industry as a benchmark for performance, but do not have a standardized meaning . C1 Cash Cost and C1 Cash Cost per unit are intended to provide supplemental information and should not be considered in isolation or as a substitute for cost of sales or other measures of performance determined in accordance with IFRS. Unlike Cost applicable to sales, C1 Cash Cost is calculate d net of by -product credits and, as a result, may be negative for a mine in periods in which by-product credits exceed that mine’s costs. The tables below set forth the following reconciliations for the three and nine months ended September 30, 2026 and 2025: (i) consolidated Total cost of sales to consolidated C1 Cash Cost of mining units; (ii) Total cost of sales by mine to consolidated Total cost of sales; (iii) Selling expenses by mine to consolidated Selling expenses. Except for commercial deductions and by -product credits, which are calculated on a production basis, these amounts can be reconciled to Buenaventura’s consolidated statements of profit or loss for the same periods.
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Set forth below is a reconciliation of consolidated Total cost of sales, to consolidated C1 Cash Cost of mining units: 2026 2025 2026 2025 Consolidated Total cost of sales 283,418 235,637 815,854 669,741 Less: Depreciation and amortization -36,801 -31,569 -99,976 -86,986 Workers’ profit sharing -7,854 -4,985 -30,846 -10,018 IFRS 16 lease costs 436 588 1,226 1,725 Mining royalties payable to the Peruvian Government 0 -1 0 -1,724 Mining royalties to third parties -4,436 -3,922 -15,472 -10,998 Provision for impairment of finished goods and products in process 2,773 -1,236 -1,072 747 Unabsorbed cost due to production stoppage -1,900 -274 -5,256 -2,219 Exploration in operating units -9,922 -6,060 -22,793 -14,944 Cost of sales of services, excluding depreciation and amortization -1,443 -1,044 -3,346 -3,492 Cost of sales of Buenaventura Trading -34,975 -23,746 -98,479 -66,999 Cost of sales of Non Mining Units & consolidation adjustments 3,385 -2,701 3,778 -15 (Increase) decrease in inventories 5,993 4,288 13,465 6,225 Consolidated mine site costs 198,673 164,975 557,083 481,043 Plus: Mining royalties to third parties 4,436 3,922 15,472 10,998 Commercial deductions (on a production basis) 25,146 33,274 94,637 104,131 Selling expenses of mining units 9,131 7,755 23,164 18,883 Less: By-product Credits -81,518 -77,472 -282,776 -185,550 Consolidated C1 Cash Cost of mining units 155,867 132,454 407,581 429,505 Set forth below is a reconciliation of Total cost of sales by mine to consolidated Total cost of sales: 2026 2025 2026 2025 Total cost of sales by mine Uchucchacua/Yumpag 58,103 43,142 166,465 137,150 El Brocal 96,571 74,848 273,431 227,577 San Gabriel 7,903 0 26,058 0 Julcani 19,625 18,246 51,491 47,936 Orcopampa 31,911 27,889 93,619 82,288 Tambomayo 26,893 32,326 73,610 75,046 La Zanja 8,729 9,458 29,789 26,674 Total cost of sales of mining units 249,736 205,909 714,462 596,672 Buenaventura Trading 34,975 23,746 98,479 66,999 Non-mining units and consolidation adjustments -1,293 5,982 2,913 6,070 Consolidated Total cost of sales 283,418 235,637 815,854 669,741 Set forth below is a reconciliation of Selling expenses (by mine) to consolidated Selling expenses: 2026 2025 2026 2025 Selling expenses by mine Uchucchacua/Yumpag 4,938 4,369 12,158 9,480 El Brocal 2,150 2,323 6,386 7,079 San Gabriel 15 0 43 0 Julcani 901 462 2,223 1,094 Orcopampa 250 132 749 457 Tambomayo 838 432 1,488 681 La Zanja 37 37 119 92 Selling expenses of mining units 9,131 7,755 23,164 18,883 Buenaventura Trading 0 0 0 0 Non-mining units and consolidation adjustments 202 681 1,178 1,401 Consolidated selling expenses 9,333 8,436 24,342 20,284 For the 3 months ended September 30 For the 9 months ended September 30 (in thousands of US$) (in thousands of US$) For the 3 months ended September 30 For the 9 months ended September 30 (in thousands of US$) For the 3 months ended September 30 For the 9 months ended September 30
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Mine Primary metal 3Q25 3Q26 9M25 9M26 Uchucchacua - Yumpag Ag (oz) Payable production (oz) 2,689,817 2,252,833 7,647,554 7,318,455 Mine site costs (US$ 000) 36,495 41,465 113,319 121,459 Mining royalties to third parties (US$ 000) - - - - Commercial deductions, on a production basis (US$ 000) 5,886 5,280 19,462 33,689 Selling expenses (US$ 000) 4,369 4,938 9,480 12,158 Less: By-product credits (US$ 000) (22,496) (26,802) (62,801) (79,075) C1 Cash Cost (US$ 000) 24,254 24,881 79,459 88,231 C1 Cash Cost (US$/oz) 9.02 11.04 10.39 12.06 El Brocal Cu (MT) Payable production (MT) 11,978 12,787 35,916 35,743 Mine site costs (US$ 000) 64,277 73,105 190,009 208,227 Mining royalties to third parties (US$ 000) - - - - Commercial deductions, on a production basis (US$ 000) 25,752 20,335 79,429 59,627 Selling expenses (US$ 000) 2,323 2,150 7,079 6,386 Less: By-product credits (US$ 000) (29,193) (25,595) (67,683) (107,573) C1 Cash Cost (US$ 000) 63,158 69,996 208,834 166,666 C1 Cash Cost (US$/MT) 5,273 5,474 5,814 4,663 San Gabriel Au (oz) Payable production (oz) - 599 - 5,058 Mine site costs (US$ 000) - 15,129 - 33,635 Mining royalties to third parties (US$ 000) - - - - Commercial deductions, on a production basis (US$ 000) - 4 - 18 Selling expenses (US$ 000) - 15 - 43 Less: By-product credits (US$ 000) - (25) - (201) C1 Cash Cost (US$ 000) - 15,124 - 33,494 C1 Cash Cost (US$/oz) - 25,240 6,622 Julcani Ag (oz) Payable production (oz) 341,048 268,924 944,190 698,180 Mine site costs (US$ 000) 12,053 13,809 33,766 38,819 Mining royalties to third parties (US$ 000) - - - - Commercial deductions, on a production basis (US$ 000) 339 (342) 1,236 (296) Selling expenses (US$ 000) 462 901 1,094 2,223 Less: By-product credits (US$ 000) (8,126) (14,461) (19,847) (36,693) C1 Cash Cost (US$ 000) 4,728 (93) 16,249 4,054 C1 Cash Cost (US$/oz) 13.86 (0.35) 17.21 5.81 Orcopampa Au (oz) Payable production (oz) 13,289 12,312 39,777 41,219 Mine site costs (US$ 000) 21,128 24,235 62,051 68,301 Mining royalties to third parties (US$ 000) 3,922 4,436 10,998 15,472 Commercial deductions, on a production basis (US$ 000) (74) (48) (99) (170) Selling expenses (US$ 000) 132 250 457 749 Less: By-product credits (US$ 000) (145) (196) (504) (646) C1 Cash Cost (US$ 000) 24,964 28,677 72,903 83,705 C1 Cash Cost (US$/oz) 1,879 2,329 1,833 2,031 Tambomayo Au (oz) Payable production (oz) 4,534 3,665 9,977 9,123 Mine site costs (US$ 000) 21,053 19,148 55,746 52,483 Mining royalties to third parties (US$ 000) - - - - Commercial deductions, on a production basis (US$ 000) 753 (587) 2,406 179 Selling expenses (US$ 000) 432 838 681 1,488 Less: By-product credits (US$ 000) (16,922) (13,717) (33,618) (55,994) C1 Cash Cost (US$ 000) 5,316 5,682 25,216 (1,844) C1 Cash Cost (US$/oz) 1,172 1,550 2,527 (202) La Zanja Au (oz) Payable production (oz) 4,936 3,398 13,077 10,194 Mine site costs (US$ 000) 9,969 11,782 26,151 34,158 Mining royalties to third parties (US$ 000) - - - - Commercial deductions, on a production basis (US$ 000) 618 504 1,697 1,590 Selling expenses (US$ 000) 37 37 92 119 Less: By-product credits (US$ 000) (590) (723) (1,097) (2,593) C1 Cash Cost (US$ 000) 10,034 11,600 26,843 33,275 C1 Cash Cost (US$/oz) 2,033 3,414 2,053 3,264 Coimolache Au (oz) Payable production (oz) 14,943 25,643 41,383 72,338 Mine site costs (US$ 000) 23,387 34,978 61,573 94,226 Mining royalties to third parties (US$ 000) - - - - Commercial deductions, on a production basis (US$ 000) 48 71 205 221 Selling expenses (US$ 000) 242 433 683 1,432 Less: By-product credits (US$ 000) (2,688) (7,197) (8,141) (25,732) C1 Cash Cost (US$ 000) 20,989 28,286 54,321 70,147 C1 Cash Cost (US$/oz) 1,405 1,103 1,313 970
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Mine Primary metal 1Q24 2Q24 3Q24 4Q24 1Q25 2Q25 3Q25 4Q25 1Q26 2Q26 3Q26 Uchucchacua - Yumpag Ag (oz) Payable production (oz) 1,350,161 2,692,270 2,987,493 2,678,406 2,482,754 2,474,983 2,689,817 2,620,666 2,475,641 2,589,981 2,252,833 Mine site costs (US$ 000) 24,440 35,104 35,547 41,546 37,870 38,954 36,495 43,725 39,034 40,960 41,465 Mining royalties to third parties (US$ 000) - - - - - - - - - - - Commercial deductions, on a production basis (US$ 000) 9,734 11,004 12,067 8,678 8,011 5,565 5,886 10,038 12,471 15,938 5,280 Selling expenses (US$ 000) 1,061 1,882 2,076 2,327 2,044 3,067 4,369 3,923 3,256 3,965 4,938 Less: By-product credits (US$ 000) (18,409) (17,267) (21,391) (16,875) (18,415) (21,891) (22,496) (30,067) (25,875) (26,398) (26,802) C1 Cash Cost (US$ 000) 16,826 30,723 28,300 35,676 29,511 25,695 24,254 27,619 28,886 34,465 24,881 C1 Cash Cost (US$/oz) 12.46 11.41 9.47 13.32 11.89 10.38 9.02 10.54 11.67 13.31 11.04 El Brocal Cu (MT) Payable production (MT) 14,714 9,653 15,996 13,528 11,482 12,456 11,978 13,392 10,227 12,729 12,787 Mine site costs (US$ 000) 58,616 56,993 63,446 68,044 60,447 65,286 64,277 76,448 67,535 67,587 73,105 Mining royalties to third parties (US$ 000) - - - - - - - - - - - Commercial deductions, on a production basis (US$ 000) 44,899 23,455 37,946 31,907 26,781 26,896 25,752 26,955 19,174 20,118 20,335 Selling expenses (US$ 000) 2,901 2,946 3,870 3,008 2,251 2,505 2,323 2,416 2,080 2,155 2,150 Less: By-product credits (US$ 000) (29,494) (12,058) (20,947) (20,075) (17,996) (20,494) (29,193) (30,997) (53,587) (28,392) (25,595) C1 Cash Cost (US$ 000) 76,923 71,335 84,314 82,885 71,483 74,193 63,158 74,821 35,202 61,469 69,996 C1 Cash Cost (US$/MT) 5,228 7,390 5,271 6,127 6,226 5,956 5,273 5,587 3,442 4,829 5,474 San Gabriel Au (oz) Payable production (oz) - - - - - - - - 1,685 2,773 599 Mine site costs (US$ 000) - - - - - - - - 4,641 13,865 15,129 Mining royalties to third parties (US$ 000) - - - - - - - - - - - Commercial deductions, on a production basis (US$ 000) - - - - - - - - 5 8 4 Selling expenses (US$ 000) - - - - - - - - - 27 15 Less: By-product credits (US$ 000) - - - - - - - - (67) (109) (25) C1 Cash Cost (US$ 000) - - - - - - - - 4,579 13,792 15,124 C1 Cash Cost (US$/oz) - - - - - - - - 2,717 4,973 25,240 Julcani Ag (oz) Payable production (oz) 365,059 419,738 248,014 296,910 322,699 280,442 341,048 338,795 279,395 149,862 268,924 Mine site costs (US$ 000) 9,247 10,215 9,859 9,826 10,521 11,192 12,053 12,466 12,688 12,322 13,809 Mining royalties to third parties (US$ 000) - - - - - - - - - - - Commercial deductions, on a production basis (US$ 000) 555 962 530 600 668 229 339 1,117 368 (321) (342) Selling expenses (US$ 000) 132 217 284 310 263 369 462 502 633 689 901 Less: By-product credits (US$ 000) (1,286) (2,993) (3,585) (4,234) (5,165) (6,556) (8,126) (8,866) (11,013) (11,219) (14,461) C1 Cash Cost (US$ 000) 8,648 8,400 7,088 6,502 6,288 5,233 4,728 5,219 2,675 1,472 (93) C1 Cash Cost (US$/oz) 23.69 20.01 28.58 21.90 19.48 18.66 13.86 15.40 9.58 9.82 (0.35)
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Mine Primary metal 1Q24 2Q24 3Q24 4Q24 1Q25 2Q25 3Q25 4Q25 1Q26 2Q26 3Q26 Orcopampa Au (oz) Payable production (oz) 18,886 17,501 17,768 16,393 14,244 12,245 13,289 15,733 14,970 13,938 12,312 Mine site costs (US$ 000) 18,326 21,848 22,297 23,519 19,968 20,955 21,128 24,493 21,435 22,631 24,235 Mining royalties to third parties (US$ 000) 3,336 3,415 4,702 3,658 3,668 3,408 3,922 5,628 5,974 5,062 4,436 Commercial deductions, on a production basis (US$ 000) 134 56 57 65 47 (73) (74) (83) (75) (46) (48) Selling expenses (US$ 000) 156 120 158 196 163 161 132 270 263 235 250 Less: By-product credits (US$ 000) (172) (212) (184) (182) (144) (215) (145) (151) (208) (243) (196) C1 Cash Cost (US$ 000) 21,780 25,226 27,029 27,256 23,702 24,237 24,964 30,158 27,389 27,639 28,677 C1 Cash Cost (US$/oz) 1,153 1,441 1,521 1,663 1,664 1,979 1,879 1,917 1,830 1,983 2,329 Tambomayo Au (oz) Payable production (oz) 8,054 8,216 7,448 7,205 2,786 2,656 4,534 4,534 2,678 2,780 3,665 Mine site costs (US$ 000) 17,433 19,410 20,635 22,192 16,192 18,502 21,053 21,600 16,352 16,983 19,148 Mining royalties to third parties (US$ 000) - - - - - - - - - - - Commercial deductions, on a production basis (US$ 000) 1,627 2,142 1,811 2,038 1,072 582 753 1,378 1,649 (883) (587) Selling expenses (US$ 000) 732 843 772 576 88 161 432 568 397 253 838 Less: By-product credits (US$ 000) (11,337) (15,633) (16,500) (12,489) (6,847) (9,848) (16,922) (24,462) (25,214) (17,063) (13,717) C1 Cash Cost (US$ 000) 8,456 6,762 6,717 12,317 10,505 9,396 5,316 (916) (6,816) (710) 5,682 C1 Cash Cost (US$/oz) 1,050 823 902 1,709 3,770 3,537 1,172 (202) (2,545) (255) 1,550 La Zanja Au (oz) Payable production (oz) 1,352 2,207 4,757 6,801 3,915 4,226 4,936 6,146 3,548 3,247 3,398 Mine site costs (US$ 000) 4,051 5,055 7,437 8,022 7,808 8,374 9,969 11,789 10,026 12,351 11,782 Mining royalties to third parties (US$ 000) - - - - - - - - - - - Commercial deductions, on a production basis (US$ 000) 122 216 478 710 429 650 618 1,156 584 502 504 Selling expenses (US$ 000) 6 22 29 39 25 30 37 47 45 36 37 Less: By-product credits (US$ 000) (52) (103) (253) (263) (204) (302) (590) (907) (1,118) (751) (723) C1 Cash Cost (US$ 000) 4,128 5,190 7,691 8,508 8,057 8,752 10,034 12,084 9,537 12,138 11,600 C1 Cash Cost (US$/oz) 3,053 2,352 1,617 1,251 2,058 2,071 2,033 1,966 2,688 3,738 3,414 Coimolache Au (oz) Payable production (oz) 22,773 7,383 8,360 9,557 13,330 13,111 14,943 22,700 23,456 23,239 25,643 Mine site costs (US$ 000) 19,331 12,569 13,757 17,116 18,253 19,933 23,387 30,034 28,634 30,614 34,978 Mining royalties to third parties (US$ 000) - - - - - - - - - - - Commercial deductions, on a production basis (US$ 000) 127 74 24 89 54 102 48 189 75 75 71 Selling expenses (US$ 000) 262 148 139 171 172 269 242 444 469 530 433 Less: By-product credits (US$ 000) (2,420) (1,028) (1,138) (1,793) (2,865) (2,587) (2,688) (5,021) (9,912) (8,624) (7,197) C1 Cash Cost (US$ 000) 17,300 11,763 12,783 15,583 15,614 17,717 20,989 25,647 19,267 22,595 28,286 C1 Cash Cost (US$/oz) 760 1,593 1,529 1,631 1,171 1,351 1,405 1,130 821 972 1,103
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APPENDIX 6: All-in Sustaining Cost All-in Beginning 4Q26, the Company will report All-in Sustaining Cost (AISC) by mine, expressed per unit of each mine’s primary metal, together with historical quarterly figures similar to those provided for C1 Cash Cost. All-in Sustaining Cost for 3Q26 - Gold Au Ounces Sold Net 20,955 2,392 1,974 25,321 23,868 Income Statement & Cash Flow US$ 000' US$/Oz Au US$ 000' US$/Oz Au US$ 000' US$/Oz Au US$ 000' US$/Oz Au US$ 000' US$/Oz Au Cost of Sales 102,227 4,878 7,720 3,228 77,563 39,289 187,510 7,405 35,426 1,484 Exploration in Operating Units 17,793 849 0 0 2,533 1,283 20,326 803 2,445 102 Royalties 4,437 212 0 0 0 0 4,437 175 0 0 Comercial Deductions3 6,860 327 10.7 4 15,683 7,944 22,554 891 120.8 5 Selling Expenses 6,941 331 37 15 2,150 1,089 9,128 360 433 18 Administrative Expenses 13,279 634 454 190 2,730 1,383 16,463 650 1,366 57 Other, net -3,632 -173 -610 -255 25 13 -4,217 -167 52 2 Sustaining Capex4 20,767 991 618 258 24,306 12,312 45,690 1,804 8,584 360 By-product Credit -219,243 -10,462 -580 -243 -209,414 -106,077 -429,237 -16,952 -6,508 -273 All-in Sustaining Cost -50,571 -2,413 7,650 3,198 -84,424 -42,764 -127,346 -5,029 41,919 1,756 All-in Sustaining Cost for 3Q26 - Copper Cu MT Sold Net 99 0 12,554 12,653 Income Statement & Cash Flow US$ 000' US$/TM Cu US$ 000' US$/TM Cu US$ 000' US$/TM Cu US$ 000' US$/TM Cu Cost of Sales 102,227 1,029,062 7,720 - 77,563 6,178 187,510 14,819 Exploration in Operating Units 17,793 179,112 0 - 2,533 202 20,326 1,606 Royalties 4,437 44,665 0 - 0 0 4,437 351 Comercial Deductions3 6,860 69,058 11 - 15,683 1,249 22,554 1,782 Selling Expenses 6,941 69,871 37 - 2,150 171 9,128 721 Administrative Expenses 13,279 133,672 454 - 2,730 217 16,463 1,301 Other, net -3,632 -36,561 -610 - 25 2 -4,217 -333 Sustaining Capex4 20,767 209,045 618 - 24,306 1,936 45,690 3,611 By-product Credit -305,914 -3,079,463 -10,684 - -25,582 -2,038 -342,180 -27,043 All-in Sustaining Cost -137,242 -1,381,539 -2,454 - 99,408 7,919 -40,289 -3,184 *All-in Sustaining Cost does not include: Depreciation and Amortization, Stoppage of mining units, Exploration in non-operating areas. Notes: 1. Non-consolidated financial statements for Compañia De Minas Buenaventura S.A.A. 2. Considers 100% from Compañia De Minas Buenaventura S.A.A., 100% from La Zanja and 100% from El Brocal. 3. For all metals produced. 4. Sustaining Capex + Growth Capex equals Acquisitions of mining concessions, development costs, property, plant and equipment. Buenaventura 1 La Zanja El Brocal Consolidated 2 3Q26 3Q26 3Q26 3Q26 3Q26 3Q26 3Q26 3Q26 3Q26 Buenaventura 1 La Zanja El Brocal Consolidated 2 Tantahuatay
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All-in Sustaining Cost for 9M26 - Gold Au Ounces Sold Net 63,239 9,555 5,638 78,431 67,088 Income Statement & Cash Flow US$ 000' US$/Oz Au US$ 000' US$/Oz Au US$ 000' US$/Oz Au US$ 000' US$/Oz Au US$ 000' US$/Oz Au Cost of Sales 296,530 4,689 26,345 2,757 218,413 38,743 541,288 6,901 98,218 1,464 Exploration in Operating Units 45,428 718 0 0 9,250 1,641 54,678 697 5,235 78 Royalties 15,472 245 0 0 0 0 15,472 197 0 0 Comercial Deductions3 48,118 761 114 12 47,714 8,464 95,946 1,223 364 5 Selling Expenses 16,645 263 118 12 6,384 1,132 23,147 295 1,432 21 Administrative Expenses 48,026 759 1,410 148 8,228 1,460 57,664 735 4,098 61 Other, net -4,758 -75 -947 -99 -291 -52 -5,996 -76 -1,347 -20 Sustaining Capex4 43,775 692 3,285 344 56,518 10,025 103,578 1,321 20,997 313 By-product Credit -857,896 -13,566 -2,999 -314 -587,229 -104,165 -1,448,125 -18,464 -22,664 -338 All-in Sustaining Cost -348,661 -5,513 27,326 2,860 -241,013 -42,752 -562,348 -7,170 106,333 1,585 All-in Sustaining Cost for 9M26 - Copper Cu MT Sold Net 215 0 34,956 35,171 Income Statement & Cash Flow US$ 000' US$/TM Cu US$ 000' US$/TM Cu US$ 000' US$/TM Cu US$ 000' US$/TM Cu Cost of Sales 296,530 1,378,312 26,345 - 218,413 6,248 541,288 15,390 Exploration in Operating Units 45,428 211,156 0 - 9,250 265 54,678 1,555 Royalties 15,472 71,916 0 - 0 0 15,472 440 Comercial Deductions3 48,118 223,659 114 - 47,714 1,365 95,946 2,728 Selling Expenses 16,645 77,368 118 - 6,384 183 23,147 658 Administrative Expenses 48,026 223,231 1,410 - 8,228 235 57,664 1,640 Other, net -4,758 -22,116 -947 - -291 -8 -5,996 -170 Sustaining Capex4 43,775 203,470 3,285 - 56,518 1,617 103,578 2,945 By-product Credit -1,136,113 -5,280,806 -45,038 - -115,089 -3,292 -1,296,239 -36,855 All-in Sustaining Cost -626,877 -2,913,810 -14,712 - 231,127 6,612 -410,462 -11,670 *All-in Sustaining Cost does not include: Depreciation and Amortization, Stoppage of mining units, Exploration in non-operating areas. Notes: 1. Non-consolidated financial statements for Compañia De Minas Buenaventura S.A.A. 2. Considers 100% from Compañia De Minas Buenaventura S.A.A., 100% from La Zanja and 100% from El Brocal. 3. For all metals produced. 4. Sustaining Capex + Growth Capex equals Acquisitions of mining concessions, development costs, property, plant and equipment. Buenaventura 1 La Zanja El Brocal Consolidated 2 9M26 9M26 9M26 9M26 9M26 9M26 9M26 9M26 9M26 Buenaventura 1 La Zanja El Brocal Consolidated 2 Tantahuatay
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All-in Sustaining Cost for 3Q25 - Gold Au Ounces Sold Net 20,572 4,910 2,555 28,038 13,433 Income Statement & Cash Flow US$ 000' US$/Oz Au US$ 000' US$/Oz Au US$ 000' US$/Oz Au US$ 000' US$/Oz Au US$ 000' US$/Oz Au Cost of Sales 88,161 4,285 8,953 1,823 61,226 23,961 158,340 5,647 18,803 1,400 Exploration in Operating Units 10,616 516 1 0 1,906 746 12,523 447 961 72 Royalties 3,922 191 0 0 0 0 3,922 140 0 0 Comercial Deductions3 6,976 339 13 3 24,049 9,411 31,037 1,107 76 6 Selling Expenses 5,395 262 36 7 2,322 909 7,753 277 243 18 Administrative Expenses 13,071 635 433 88 2,373 929 15,877 566 947 70 Other, net 4,393 214 -93 -19 2,085 816 6,385 228 821 61 Sustaining Capex4 13,298 646 3,194 651 13,887 5,435 30,379 1,083 3,048 227 By-product Credit -171,397 -8,331 -907 -185 -140,035 -54,803 -312,339 -11,140 -2,480 -185 All-in Sustaining Cost -25,565 -1,243 11,630 2,368 -32,187 -12,597 -46,122 -1,645 22,419 1,669 All-in Sustaining Cost for 3Q25 - Copper Cu MT Sold Net 120 0 11,813 11,933 Income Statement & Cash Flow US$ 000' US$/TM Cu US$ 000' US$/TM Cu US$ 000' US$/TM Cu US$ 000' US$/TM Cu Cost of Sales 88,161 735,533 8,953 - 61,226 5,183 158,340 13,269 Exploration in Operating Units 10,616 88,570 1 - 1,906 161 12,523 1,049 Royalties 3,922 32,722 0 - 0 0 3,922 329 Comercial Deductions3 6,976 58,203 13 - 24,049 2,036 31,037 2,601 Selling Expenses 5,395 45,011 36 - 2,322 197 7,753 650 Administrative Expenses 13,071 109,052 433 - 2,373 201 15,877 1,330 Other, net 4,393 36,651 -93 - 2,085 176 6,385 535 Sustaining Capex4 13,298 110,945 3,194 - 13,887 1,176 30,379 2,546 By-product Credit -244,090 -2,036,462 -18,527 - -31,123 -2,635 -293,740 -24,615 All-in Sustaining Cost -98,258 -819,774 -5,990 - 76,724 6,495 -27,524 -2,306 *All-in Sustaining Cost does not include: Depreciation and Amortization, Stoppage of mining units, Exploration in non-operating areas. Notes: 1. Non-consolidated financial statements for Compañia De Minas Buenaventura S.A.A. 2. Considers 100% from Compañia De Minas Buenaventura S.A.A., 100% from La Zanja and 100% from El Brocal. 3. For all metals produced. 4. Sustaining Capex + Growth Capex equals Acquisitions of mining concessions, development costs, property, plant and equipment. Buenaventura1 La Zanja El Brocal Consolidated 2 Tantahuatay 3Q25 3Q25 3Q25 3Q25 3Q25 Buenaventura1 La Zanja El Brocal Consolidated 2 3Q25 3Q25 3Q25 3Q25
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APPENDIX 7 Compañía de Minas Buenaventura S.A.A. and Subsidiaries Interim consolidated statements of financial position As of September 30, 2026 (unaudited) and December 31, 2025 (audited) 2026 2025 US$(000) US$(000) Assets Current assets Cash and cash equivalents 1,000,617 529,839 Trade and other receivables 361,774 532,463 Inventories 110,865 75,668 Income tax assets 1,249 602 Prepaid expenses 14,152 17,944 1,488,657 1,156,516 Non-current assets Trade and other receivables 635,120 646,415 Investments in associates and joint venture 1,789,329 1,738,408 Property, plant, equipment and development cost 2,516,193 2,314,432 Prepaid expenses 19,712 20,376 Current income tax asset 1,802 1,839 Deferred income tax asset 22,059 80,740 Other non-financial assets 62,949 64,110 5,047,164 4,866,320 Total assets 6,535,821 6,022,836 Liabilities and equity Current liabilities Trade and other payables 392,982 457,441 Financial obligations 9,534 8,929 Provisions 60,912 62,075 Current income tax payable 71,490 43,422 Contingent consideration liability 5,078 4123 539,996 575,990 Non-current liabilities Trade and other payables 26,386 32,897 Financial obligations 683,815 700,738 Provisions 413,969 370,528 Contingent consideration liability 30,250 35,224 Deferred income tax liabilities 30,614 39,994 1,185,034 1,179,381 Total liabilities 1,725,030 1,755,371 Equity Capital stock 750,497 750,497 Investment shares 791 791 Additional paid-in capital 218,450 218,450 Legal reserve 163,544 163,544 Other reserves 31,897 31,897 Other reserves of equity -96 -96 Retained earnings 3,404,325 2,896,807 Shareholders’ equity attributable to owners of the parent 4,569,408 4,061,890 Non-controlling interest 241,383 205,575 Total equity 4,810,791 4,267,465 Total liabilities and equity 6,535,821 6,022,836
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2026 2025 2026 2025 US$(000) US$(000) US$(000) US$(000) 540,625 428,414 1,689,443 1,099,759 4,700 2,624 9,434 8,485 545,325 431,038 1,698,877 1,108,244 (218,577) (186,310) (637,332) (528,092) (1,900) (274) (5,256) (2,219) (1,443) (1,044) (3,346) (3,492) (36,801) (31,569) (99,976) (86,986) (20,261) (12,518) (54,472) (36,231) (4,436) (3,922) (15,472) (12,721) (283,418) (235,637) (815,854) (669,741) 261,907 195,401 883,023 438,503 (17,710) (17,032) (61,462) (50,616) (9,333) (8,436) (24,342) (20,284) (9,249) (6,805) (20,899) (17,372) (2,898) (1,075) (3,350) (752) 3,701 (7,741) 4,898 (13,424) (35,489) (41,089) (105,155) (102,448) 226,418 154,312 777,868 336,055 134,214 71,115 354,739 187,060 (4,562) 11,605 (13,001) 45,541 11,941 4,338 22,833 20,906 (15,790) (20,520) (51,323) (59,922) 352,221 220,850 1,091,116 529,640 (49,012) (34,428) (212,902) (67,369) (34,439) (7,199) (49,301) (34,424) (83,451) (41,627) (262,203) (101,793) 268,770 179,223 828,913 427,847 (400) (224) (3,515) (3,689) 268,370 178,999 825,398 424,158 245,090 167,149 759,082 398,540 23,280 11,850 66,316 25,618 268,370 178,999 825,398 424,158 1.06 0.70 3.25 1.67 0.96 0.66 2.99 1.57 Compañía de Minas Buenaventura S.A.A. and Subsidiaries Interim consolidated statements of profit or loss (unaudited) For the three-month and nine-month periods ended September 30, 2026 and 2025 Attributable to owners of parent Attributable to owners Basic and diluted profit per share, stated in U.S. dollars Net profit Non-controlling interest Owners of the parent Profit attributable to: Net profit Loss from discontinued operations, net of taxes Discontinued operations Profit from continuing operations Deferred income tax Current income tax Profit before income tax Finance costs Finance income Foreign currency exchange difference Share in the results of associates and joint venture Operating income Total operating income (expenses), net Other, net Reversal (provision) of contingencies Exploration in non-operating areas Selling expenses Administrative expenses Operating income (expenses), net Gross profit (loss) Total cost of sales Mining royalties Exploration in operating units Depreciation and amortization Cost of sales of services, excluding depreciation and amortization Unabsorbed cost due to production stoppage Cost of sales of goods, excluding depreciation and amortization Cost of sales Continuing operations Total operating income Sales of services Sales of goods Operating income For the three-month periods For the nine-month periods ended September 30, ended September 30,
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Notes 2026 2025 2026 2025 US$(000) US$(000) US$(000) US$(000) Cash flows from operating activities Proceeds from sales of goods and services 559,197 383,156 1,851,037 1,007,963 Dividends received from associates 18(a) 126,493 62,046 303,878 113,900 Recovery of taxes 2,414 8,203 17,652 52,237 Interest received 7,314 6,782 17,209 15,468 Dividends received from investments - - 1,000 1,050 Payments to suppliers and third parties, and others net (172,419) (171,699) (580,976) (547,422) Payments to employees (46,334) (39,068) (175,656) (133,995) Interest paid (22,000) (27,061) (46,136) (44,643) Income tax and royalties paid to the Peruvian Government (71,973) (33,117) (234,050) (112,205) Payment of royalties to third parties (4,804) (3,363) (16,779) (10,735) Payments for tax litigation - - - - Net cash flows generated from operating activities 377,888 185,879 1,137,179 341,618 Cash flows from investing activities Collection from the sale of shares of the subsidiary Chaupiloma Dos de Cajamarca S.C.R.L. - - - - Proceeds from sale of property, plant and equipment 290 1,148 464 1,712 Proceeds from sale of investments in Contacto Corredores de Seguro S.A. - - - - Payments for acquisition of property, plant and equipment and development costs 7(a) (126,035) (136,815) (363,580) (322,629) Payments for acquisition of other assets - - - (6,900) Cash contribution in associates - - - - Net cash flows used in investing activities (125,745) (135,667) (363,116) (327,817) Cash flows from (used in) financing activities Issuance of Senior Notes, net of issuance costs - - - 634,344 Decrease (increase) of bank accounts in trust 4(a) (1,989) (1,033) (1,931) (1,013) Dividends paid to controlling interest - - (251,564) (74,220) Payments of financial obligations 9(d) - (150,296) (17,321) (555,063) Lease payments 9(d) (699) (1,696) (1,961) (2,631) Dividends paid to non-controlling interest (7,748) - (30,508) (7,929) Net cash flows from (used in) financing activities (10,436) (153,025) (303,285) (6,512) Increase (decrease) in cash and cash equivalents during the period, net 241,707 (102,813) 470,778 7,289 Cash and cash equivalents at beginning of period 758,910 588,537 529,839 478,435 Cash and cash equivalents at the end of the period 3 1,000,617 485,724 1,000,617 485,724 Reconciliation of net profit to cash and cash equivalents provided by operating activities Net profit 268,370 178,999 825,398 424,158 Plus (less): Share in the results of associates and joint venture (134,214) (71,115) (354,739) (187,060) Deferred income tax 34,438 7,199 49,300 34,424 Current income tax 31,721 24,283 138,951 47,980 Exchange difference 4,562 (11,605) 13,001 (45,541) Contingencies 3,300 557 5,036 3,723 Depreciation and amortization in cost of sales 36,801 31,569 99,976 86,986 Depreciation and amortization in others 418 251 1,261 1,100 Finance costs 5,958 4,581 11,780 13,829 Mining Royalties and Special Mining Tax 17,291 10,146 73,951 19,390 (Reversal) provision for impairment of value of inventory (12,152) 6,861 (8,307) 4,878 Finance (income) costs for contingent consideration liability (6,693) 977 (4,019) 2,788 Bonus provision - executives & employes (25,194) 12,425 17,304 29,989 Fair value of accounts receivables and adjustments to prior period liquidations 7,094 (18,551) 122,418 (40,576) Environmental liabilities 4,573 - 7,504 Other minors (16) 705 223 1,624 Net changes in operating assets and liabilities: Decrease (increase) in operating assets - Trade and other accounts receivable 3,492 (30,600) 46,565 (43,382) Inventories (13,096) (2,546) (26,890) (2,131) Prepaid expenses 5,880 6,715 4,456 6,958 Investments in associates 126,472 62,020 303,818 113,824 Increase (decrease) in operating liabilities - Trade and other accounts payable 49,053 (9,797) (65,142) (48,471) Provisions (4,507) (6,138) (12,020) (11,744) Income tax payable (25,663) (11,057) (112,646) (71,128) Net cash and cash equivalents used in operating activities 377,888 185,879 1,137,179 341,618 ended September 30, ended September 30, Compañía de Minas Buenaventura S.A.A. and Subsidiaries Interim consolidated statements of cash flows (unaudited) For the three-month and nine-month periods ended September 30, 2026 and 2025 For the three-month periods For the nine-month periods