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Mineralized Calderas in Colorado
May 2002 by Edgar B. Heylmun, PhD
A caldera is a large circular volcanic depression caused by collapse due to the removal of molten magma from an underlying magma chamber. The removal of magma is due to explosive venting of lava and pyroclastic material.
Miners Win Again in SREP vs. USFS
It’s been three years since the Siskiyou Regional Education Project (SREP) filed a lawsuit against the Siskiyou National Forest (SNF) in an attempt to require a Plan of Operation and financial guarantee (bond) for all mining located in Riparian Reserves (in or near water).
Ask the Experts
Heading for Australia to metal detect for gold. Tips? Suggestions?
Ask The Experts
Geologic references for northern Nevada
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.
Ask the Experts
• Gold in West Virginia?
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.
House Chair Requests Records on Forest Decision
House Resources Chairman Don Young is asking the White House and Agriculture Department for records related to President Clinton's decision to place 40 million acres of remote, federal forest land off-limits for development.
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The Bawl Mill
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