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Small Mining Operations

Prospecting for Copper—What to Look for on the Outcrop

For the prospector, knowing what oxidized hydrothermal alteration looks like in the field is an important exploration tool.

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Dredging Tips and Tricks: A Measure of Water Pump Efficiency


…as an academic argument, when mated to the appropriate engine, is the pump really moving water at the rate of 400 GPM?

Selenium, Mercury and Suction Dredging—Studies Contradict CA State Water Resources Board


Federal and state regulatory agencies often cite mercury and methyl mercury in our waterways as a major factor for further restrictions on placer mining, and on suction gold dredge mining, in particular. However, these regulatory agencies are minimizing selenium and its neutralizing effects.

Gary It's There


This year was a test. We had never done anything like this before, yet we grossed $30,000 in the short time we had to mine.

Proper Spacing of Placer Sample Sites


The zone of influence of each sample must be carefully considered when deciding how far sample sites should be spaced from each other.

Northwestern Alaska Mineral Resources


Gold and jade are actually only minor mineral resources for the Northwestern Alaska region as a whole. Modern prospecting has focused more on base metal than precious metal resources.

Montana Gold and Sapphires Revisited


I had a chance to visit the operation in person and talk with Neal. I was very impressed and I think our readers could learn a lot about building up a commercial placer operation from scratch…

Cyanide-Free Gold Separation


Some ores—mostly those with a high free gold content—are very amenable to gravity concentration. Well oxidized ores containing coarse gold are usually best for non-cyanide processes. Ores with significant sulfide content may require the...

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