Mineralized Calderas in Colorado
May 2002 by Edgar B. Heylmun, PhDA 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.
Have you ever wondered how accurate specific gravity tests are in determining the amount of gold in a specimen?
The Umpqua River, located in the heart of western Oregon, flows for several miles nearly alongside Interstate Highway Five.
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In August 1862, prospectors from Walla Walla, Washington, led by George Grimes, discovered gold near the present townsite of Pioneer City. Grimes was killed by Indians shortly after the discovery. The remaining argonauts retreated to Walla Walla. On October 10, 1862, 52 men returned to Grimes Creek. They built a fort and several cabins before continuing their quest for gold.
Portable, hand-operated, bellows drywashers have been used for over a hundred years to recover gold in the deserts of Arizona, New Mexico, California and Nevada. Drywashers were considered a last resort over...
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Gov. Bill Owens announced to members of the mining industry that he would consider a proposal that provides significant tax reductions for mining companies.
The Bawl Mill • Our Readers Say • California Wilderness Coalition and The Nature Conservancy Recruit Government Employees to Carry Out Huge Land Grab • Drywashing Rules Clarified • The Keystone Gold-Copper District, Medicine Bow Mountains, Southeastern Wyoming • Picks & Pans: Mining Tungsten Ore—A Case History • Gold in Oregon • Aussie Gold—A Look at the Northern Territory • The Phoenix Gold Mine: A Brief History • Calico Mine • Mining Stock Quotes and Mineral & Metal Prices • Looking Back • Melman on Gold & Silver