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Basic Drywashing Principles

Within the arid desert regions of the American Southwest and Western Australia, drywashers have proven to be a simple and inexpensive method for concentrating placer gold. Drywashers are not limited to desert operations...

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Turning Acid Mine Drainage Into Drinking Water?—Grass Valley Company May Have the Answer


HPT Research recently tested their patented process for treating Acid Mine Drainage (AMD) on thousands of gallons of contaminated water at the Mammoth Mine.

BLM 3809 Final Rule Implications


Many readers of ICMJ have asked for more information regarding the BLM’s 3809 regulation changes that were pushed through just prior to the departure of the Clinton Administration.

Underground Mining: Stoping Methods


In an old mine that does not have stopes, you know the old miners did not take much if any ore out of that excavation. On the other hand, if you see large stopes within the mine you know that it is these places where the miners found profitable ore deposits within the vein.

Early Summer Mining in Wyoming


Old tailing piles extend for miles. There was still plenty of water flowing here, so WPA members set up highbankers at several settling ponds.

Evaluating a Placer Discovery


Gold mineralization is usually first noted in an area by examining material weathered from the source and liberated or washed downhill from it.

Specialized Equipment Available for Hire


Since we’ve already covered the basics of permitting a “Notice Level” mining operation, it’s time to talk actual mining.

Detecting in Australia's Etheridge Goldfield


This remote goldfield covers an area of over 13,000 square miles of the Savanna Gulf country of Far North Queensland, Australia.

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