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Exhibit 99.1 ARCH RESOURCES NEWS RELEASE Investor Relations 314 / 994-2916 FOR IMMEDIATE RELEASE Arch Resources Reports Third Quarter 2021 Results Delivers nearly 100 - percent sequential increase in core metallurgical segment gross margin Commences longwall operations at transformational Leer South mine Drives forward with thermal strategy of harvesting cash and rationalizing footprint Announces resumption of quarterly cash dividend 1 ST . LOUIS , October 26 , 2021 - Arch Resources , Inc. ( NYSE : ARCH ) today reported net income of $ 89.1 million , or $ 4.92 per diluted share , in the third quarter of 2021 , compared with a net loss of $ 191.5 million , or $ 12.64 per diluted share , in the prior - year period . Arch had adjusted earnings before interest , taxes , depreciation , depletion , amortization , accretion on asset retirement obligations ( ARO ) , and non - operating expenses ( " adjusted EBITDA ” ) ¹ of $ 131.6 million in the third quarter of 2021 , which included a $ 19.6 million non - cash mark - to - market loss associated with the company's coal - hedging activities . This compares to $ 17.4 million of adjusted EBITDA in the third quarter of 2020 , which included a $ 2.6 million non - cash mark - to- market loss associated with the company's coal - hedging activities . Revenues totaled $ 594.4 million for the three months ended September 30 , 2021 , versus $ 382.3 million in the prior - year quarter . In the third quarter of 2021 , Arch made significant progress on numerous strategic priorities and objectives : Commenced highly anticipated longwall operations at its world - class Leer South mine , where the ramp towards full production is expected to be completed in early 2022 ; Captured a nearly 100 - percent step - up in coking coal margins in its core metallurgical segment , reflecting a robust and strengthening pricing environment throughout Q3 ; Achieved another strong shipping quarter for its metallurgical segment ; Generated high levels of cash with its legacy thermal segment , while simultaneously reducing its long - term closure obligations in a responsible and systematic way ; Effectively sold out its thermal mines for 2022 at highly advantageous pricing levels as part of a significant and newly built book of future business ; and Delivered an exceptional environmental and safety performance , furthering its strong execution against a wide range of environmental , social and governance ( ESG ) metrics . 1 Adjusted EBITDA is defined and reconciled in the " Reconciliation of Non - GAAP measures " in this release . 1