Re: Plenty on US soil
One of the reasons mining is rarer is that the mine owners now have to remediate the mines. Mine waste is highly toxic and has to go somewhere. China doesn't enforce environmental regulations so it's not a concern. If you want to see a worse case of what happens with the leftovers take a visit to the Berkeley pit in Montana. Visited it when I worked for the US DOE. https://en.wikipedia.org/wiki/Berkeley_Pit . The Berkeley Pit is a former open pit copper mine in the western United States, located in Butte, Montana. It is one mile (1.6 km) long by one-half mile (800 m) wide, with an approximate maximum depth of 1,780 feet (540 m). It is filled to a depth of about 900 feet (270 m) with water that is acidic (4.1 - 4.5 pH level), about the acidity of beer or tomatoes.[1] As a result, the pit's water is laden with heavy metals and dissolved metals that leach from the rock in a natural process known as acid rock drainage. The pit's water content includes (but is not limited to) dissolved copper, arsenic, cadmium, zinc, and sulfuric acid.