A multiyear downturn in the energy commodity, used to generate electricity and make steel, is worsening as miners continue to produce too much supply and China’s economy slows, said Mike Henry. China’s restrictions on certain types of highly polluting coa l, introduced earlier this year as part of an accelerating campaign to clean up its air, have added to a significant glut in the global market for the fuel, the mining executive said on Friday. “There are no signs of things getting better in the immediate term,” he said during a speech in Brisbane, Australia, according to prepared remarks. Coal prices have been tumbling since 2011 as cooling demand for the fuel was met by rising supplies from new mines planned when the market was booming. Price declines have deepened this year. The value of metallurgical coal, which is burned for steelmaking, is down as much as 30% from […]