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Little Rocky Mountains, Montana
February 2000 by Edgar B. Heylmun, PhD
The Little Rocky Mountains are a group of wooded hills, 10 miles long and 8 miles wide, which form an island in the Great Plains of north-central Montana. They rise to 5,708 feet, 2,000 feet above the surrounding plains.
Wall-Rock Alteration
Wall-rock (country rock) alteration is found in all hard-rock mining districts and has been caused by hydrothermal solutions in the past history of the region. The zones of alteration have a bearing on where one might drill for ore bodies. The weekend prospector does not have the tools nor knowledge to block out ore deposits, but he can narrow down his search dramatically by understanding the zones of wall-rock alteration that he sees.
The Sunbaker
My hunch was that the gold is coming down the apron, falling off to both sides and into both gulches. I say that because the gold we found previously has the same characteristics and color across the entire area.
San Manuel Mine Officially Closes With a Bang
One of the largest underground copper mines in the world officially closed mid-January, as demolition crews blasted its twin smelter stacks.
Customizing Your Dredge
I am going to suggest dozens of ways you can increase suction power, dredge to greater depths, and improve recovery methods in your sluice box.
Guinea Africa: Gold, Ebola, and A Monkey Barbecue
Doubters be informed, yes, there is gold in Africa—lots of gold—and all the good and bad that comes with it.
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