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UNITED LIME & STATES MINERALS United States Lime & Minerals Reports Second Quarter 2021 Results and Declares Regular Quarterly Cash Dividend DALLAS , July 28 , 2021 ( GLOBE NEWSWIRE ) United States Lime & Minerals , Inc. ( NASDAQ : USLM ) today reported second quarter 2021 results : The Company's revenues in the second quarter 2021 were $ 49.2 million , compared to $ 37.5 million in the second quarter 2020 , an increase of $ 11.6 million , or 30.9 % . For the first six months 2021 , revenues were $ 90.8 million , compared to $ 76.0 million in the first six months 2020 , an increase of $ 14.8 million , or 19.5 % . The Company's revenues from its lime and limestone operations in the second quarter and first six months 2021 were $ 48.7 million and $ 90.1 million , respectively , compared to $ 37.4 million and $ 75.6 million , respectively , in the comparable 2020 periods . Lime and limestone revenues increased $ 11.4 million , or 30.5 % , and $ 14.5 million , or 19.2 % , in the second quarter and first six months 2021 , respectively , compared to the second quarter and first six months 2020. In the second quarter 2020 , the COVID - 19 pandemic and related restrictions on business activities resulted in a general economic slowdown , which disproportionately impacted certain industries that purchase the Company's products , including oil and gas services , environmental , and steel . Carthage Crushed Limestone ( " Carthage " ) , which the Company acquired on July 1 , 2020 , contributed $ 2.5 million and $ 4.7 million to the Company's lime and limestone revenues for the second quarter and first six months 2021 , respectively . Carthage revenues were primarily from agriculture , roofing , and construction customers . In addition to the added Carthage revenues , the increases in lime and limestone revenues in the second quarter and first six months 2021 , compared to the comparable 2020 periods , resulted primarily from increased sales to the Company's construction , steel , roofing , and environmental customers . In the second quarter 2021 , demand from the Company's oil and gas services customers also increased compared to the second quarter 2020. Second quarter and first six months 2021 revenues were also favorably impacted by increases in the average selling prices for the Company's lime and limestone products . The Company's gross profit was $ 16.8 million in the second quarter 2021 , compared to $ 10.4 million in the second quarter 2020 , an increase of $ 6.4 million , or 62.2 % . Gross profit in the first six months 2021 was $ 28.6 million , an increase of $ 8.4 million , or 41.3 % , from $ 20.2 million in the first six months 2020. Our lime and limestone gross profit was $ 16.7 million in the second quarter 2021 , compared to $ 10.5 million in the second quarter 2020 , an increase of $ 6.2 million or 58.8 % . Our lime and limestone gross profit in the first six months 2021 was $ 28.5 million , compared to $ 20.5 million in the first six months 2020 , an increase of $ 8.0 million , or 38.7 % . The increase in gross profit in the 2021 periods , compared to the comparable 2020 periods , resulted primarily from the increased revenues discussed above and increased operating efficiencies . Selling , general and administrative ( " SG & A " ) expenses were $ 3.0 million in the second quarter 2021 , compared to $ 2.9 million in the second quarter 2020 , an increase of $ 0.1 million , or 2.6 % .