The signs of copper, which the prospector most commonly sees in the field in outcrops and on the surface, are secondary minerals caused by the action of air and water on the original copper-bearing sulfides that were deposited deep...
Governor Brian Schweitzer is calling on the Obama administration to force General Motors to honor its contract with a Montana mining company instead of going overseas to buy the precious metals used to control vehicle pollution.
The agency said managers “showed a disregard for the miners’ welfare” and acted with “more than ordinary negligence” before the victim fell through a sinkhole while operating a large loader about 200 feet below the entrance of the mine.
After picking up a large grey rock, ready to discard it, I immediately noted it was extremely heavy. My eyes started getting bigger and bigger as I wiped off the surface dirt and moistened it—the color yellow started showing.
With all of the erosion patterns wearing away the channels down into the North Fork of the Middle Fork, we assumed placer gold was still available in the river. The question became: How do we get down the 1,600-foot elevation drop to reach the river?
Bribery allegations against four Rio Tinto employees detained in China are “wholly without foundation,” the mining company said, as Australia continued to press Beijing for details of a case that is straining ties between the two nations.