One of the U.S.'s biggest publicly traded crypto mining companies showed how well it fared over the rough-and-tumble months of April to June. It was mostly not good. Why it matters : Mining companies are considered the last line of defense, often the last to sell amid downturns, because their business models can withstand the volatile swings of the digital assets they mine with high-powered computer equipment. But they have recently shown signs of stress. Driving the news: Marathon Digital Holdings yesterday said losses widened in the second quarter to $191.6 million, due in large part to a $127.6 million impairment on its bitcoin holdings as prices declined 56% in the period. Details: It suffered from operational challenges related to rising energy costs, maintenance issues and weather impacting production. By the numbers : Marathon reported $24.9 million of revenue in the second quarter, about a 15% decline from the prior year quarter of $29.3 million.