Stamp mills were a proven method of proccessing in early mining.
 

There are currently about 170 commercial-scale placer operations in Alaska. Most of these are small operations with just a few people working; they are often family affairs that operate seasonally only during favorable weather.

PolyMet contends the project will actually reduce mercury and sulfate discharges into the St. Louis River watershed because it will clean up an old iron mining waste pond at the processing plant site.

• NEPA comments due
• Update on latest US Supreme Court suction gold dredging appeal
• Washington State tries to restrict suction gold dredging

The critical metals are essential to the modern lives we lead. The prices of critical metals are moving up even faster than government published rates of inflation, with little sign of slowing down.

…2017 was just the first year with a small increase after a huge drop off in exploration activity. It may take many years of future increases to get back to where the activity was in 2012, as projected increases in exploration spending are seen to be slow and steady.