Base metals industry

FILE - This Dec. 13, 2016, file photo, shows the former Anaconda smelter smokestack behind sculptures of miners at the Anaconda Smelter Stack State Park viewing area in Anaconda, Montana. Residents in the nearby community of Opportunity are suing to get the Atlantic Richfield Co. to do a more thorough cleanup of arsenic in residential yards. The Montana Supreme Court ruled in December 2017 that they could move forward with their 2008 lawsuit. Arco appealed, arguing a state lawsuit shouldn't be able to interfere with an ongoing cleanup. The U.S. Supreme Court said Monday, June 10, 2019, it will hear the appeal. (AP Photo/Matt Volz, File)

In this photo taken Monday, May 13, 2019, a sign for Sonoita stands in the heart of southeastern Arizona where owners of wineries and other small tourism operations worry that the Rosemont Copper Mine proposed to be built in the nearby Santa Rita Mountains could harm their businesses with mining trucks rumbling down scenic state highway 83 that runs past the range. Native American tribes are seeking an injunction to halt work on the copper mine project they say will desecrate burial and other sacred sites in the Santa Rita Mountains of southeastern Arizona. (AP Photo/Anita Snow)

Martin Tower, former world headquarters of Bethlehem Steel, implodes Sunday May 19, 2019 in Bethlehem, Pa. Crowds gathered to watch the demolition of the area's tallest building, a 21-story monolith that opened at the height of Bethlehem Steel's power and profitability but had stood vacant for a dozen years after America's second-largest steelmaker went out of business. (AP Photo/Jacqueline Larma)

President Donald Trump speaks at the National Association of REALTORS Legislative Meetings and Trade Expo, Friday, May 17, 2019, in Washington. (AP Photo/Alex Brandon)

This May 8, 2019, photo shows Martin Tower in Bethlehem, Pa. The 21-story building, the former global headquarters of defunct steelmaker Bethlehem Steel Corp., is set to be imploded on May 19, 2019. (AP Photo/Michael Rubinkam)

A power plant steams behind steel works of German steelmaker Thyssenkrupp in Duisburg, Germany, Thursday, May 9, 2019. Steelmaking giant Thyssenkrupp of Germany says it expects European antitrust regulators to block its plan to combine its European operations with India's Tata Steel. (AP Photo/Martin Meissner)

FILE - In this May 31, 2012 file photo, an Iranian worker cuts a steel roll at the Mobarakeh Steel Complex, some 280 miles (460 kilometers) south of the capital Tehran, and some 40 miles, 65 kilometers, southwest of central Iranian city of Isfahan. President Donald Trump ordered new sanctions on Iran Wednesday targeting Iran's steel, aluminum, copper and iron sectors, which provide foreign currency earnings for the nation's sagging economy. (AP Photo/Vahid Salemi, 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-This Aug. 22, 2018, file photo shows a sign declaring the future home of Braidy Industries' aluminum mill in Ashland, Ky. An aluminum company planning to build a $1.7 billion plant in Appalachia is forming a partnership with a Russian company that until recently faced U.S. sanctions. Russian aluminum giant Rusal wants to invest $200 million in an aluminum rolling mill that Braidy Industries intends to build near Ashland, Kentucky. Rusal says it would assume a 40 percent ownership share in the mill in return for the investment. Braidy Industries would hold the other 60 percent share. (AP Photo/Adam Beam, File)