Base metals industry

In this Thursday, Aug. 15, 2019, photo several dead fish float along the bank of Burns Ditch near the Portage Marina in Portage, Ind. Some beaches along northwestern Indiana's Lake Michigan shoreline are closed after authorities say a chemical spill in a tributary caused a fish kill. (John Luke/The Times via AP)

FILE - In this May 13, 2019, file photo, 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. A federal judge on Wednesday, July 31, 2019, has overturned the U.S. Forest Service's approval of a Canadian company's planned new copper mine in southeastern Arizona. The judge ruled the agency improperly evaluated and considered water use issues associated with the Rosemont Mine planned in the Santa Rita Mountains on part of the Coronado National Forest. (AP Photo/Anita Snow, File)

This undated photo provided by 4th Row Films shows Fernando Serrano, 23, who plays a striking miner in "Bisbee '17," a story of how some 1,200 miners, most of them immigrants, were pulled violently from their homes in Bisbee, Ariz., by a private police force and put on cattle cars for deportation to a desolate area of New Mexico in 1917. The dark history of Bisbee was largely an open secret for decades in the funky old copper town just seven miles north of the U.S.-Mexico border. It's the sixth film of director Robert Greene, who said he learned about the town southeastern Arizona around 15 years ago. (Jarred Alterman/4th Row Films via AP)

FILE - This Feb. 10, 2016, file photo, shows a former iron ore processing plant near Hoyt Lakes, Minn., that would become part of a proposed PolyMet copper-nickel mine. Environmental Protection Agency documents show that its staffers were critical of how Minnesota regulators drafted a key permit for the planned PolyMet copper-nickel mine. And they show the EPA officials concluded the permit would violate federal law because it lacked specific water pollution limits. The EPA released the documents after a court challenge by WaterLegacy. Environmental attorney Paula Maccabee says the EPA's concerns weren't reflected in PolyMet's final water pollution permit. (AP Photo/Jim Mone, File)

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)