Metals and minerals industry

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)

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)

FILE - IN this Sept. 26, 2017, file photo, U.S. Ambassador to Canada Kelly Knight Craft stands during her swearing in ceremony in the Indian Treaty Room in the Eisenhower Executive Office Building on the White House grounds in Washington. Three Democratic senators are calling on President’s Donald Trump’s nominee to be U.S. ambassador to the United Nation to clarify that she will put U.S. interests ahead of her own financial interests when it comes to climate change. The Democrats say Craft, who was nominated to the U.N. post last week, has invested more than $60 million in oil companies and other fossil fuel interests. Her husband, Joe Craft, is CEO of Alliance Resource Partners, one of the largest U.S. coal producers. (AP Photo/Alex Brandon, File)

Democratic presidential candidate Sen. Cory Booker, D-N.J., answers questions during a presidential forum held by She The People on the Texas State University campus Wednesday, April 24, 2019, in Houston. (AP Photo/Michael Wyke)

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)