Metals and minerals industry

FILE - In this April 4, 2013, file photo, a mechanized shovel loads a haul truck with coal at the Spring Creek coal mine near Decker, Mont. A federal judge in Montana says the Trump administration failed to consider the environmental effects of resuming coal sales from federal lands, but stopped short of halting future sales. U.S. District Judge Brian Morris on Friday, April 19, 2019, ordered government attorneys to enter negotiations with states and environmental groups that had sued to stop the lease sales. (AP Photo/Matthew Brown, File)

Pura Castell walks to a government-run butcher shop to buy chicken, after failing to find chicken the previous day in Bauta, Cuba, Friday, April 12, 2019. A neighbor informed her that chicken had arrived at the government store that distributes almost free monthly food rations. (AP Photo/Ramon Espinosa)

FILE - In this Dec. 11, 2018 file photo, then-Secretary of the Interior Ryan Zinke speaks at EPA headquarters in Washington. Zinke has landed a more than $100,000-a-year job with a Nevada gold-mining firm. Zinke confirmed by phone Tuesday, April 16, he has accepted a consulting and board position with U.S. Gold Corp., a company with business before Zinke's former agency, the Interior Department. (AP Photo/Cliff Owen, File)

This 2002 photo released by Redbush Classics Records shows rockabilly Hall of Famer Billy Adams performing in Hemsby, England. Adams, who wrote and recorded a rockabilly staple “Rock, Pretty Mama,” died Saturday, March 30, 2019, in Westmoreland, Tenn. He was 79. (Redbush Classics Records via AP)

FILE - In this Feb. 10, 2016, file photo, the closed LTV Steel taconite plant is abandoned near Hoyt Lakes, Minn. The Army Corps of Engineers has awarded the planned PolyMet copper-nickel mine in northeastern Minnesota the final permit it needs to proceed. The permit deals with how PolyMet will mitigate its effects on wetlands. PolyMet calls it a "historic achievement" that will let it move forward with Minnesota's first copper-nickel mine. Minnesota regulators issued the other key permits for the project last year, but the mine still faces court challenges. (AP Photo/Jim Mone, File)

Retired coal miner John Robinson uses a nebulizer during his daily breathing treatments for black lung disease on Thursday, Jan. 24, 2019 in Coeburn, Va. Robinson was 47 when he was diagnosed with black lung disease, part of a new generation of black lung sufferers who are contracting the deadly disease at younger ages. (AP Photo/Dylan Lovan)

An island of solar panels floats in a pond at the Los Bronces mining plant, about 65 kilometers (approximately 40 miles) from Santiago, Chile, Thursday, March 14, 2019. The island of solar panels could give purpose to mine refuse in Chile by using them to generate clean energy and reduce water evaporation.(AP Photo / Esteban Felix)