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August 2005 by Staff
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Solar-Powered Placer Sampling Equipment
December 2002
One hundred and seven years ago the world’s first electric-powered bucket line dredge started to work in Montana. This summer, Montana likely saw its first solar-powered Denver Gold Saver put to work.
One hundred and seven years ago the world’s first electric-powered bucket line dredge started to work in Montana. This summer, Montana likely saw its first solar-powered Denver Gold Saver put to work.
Synclinal Oil
April 2005
Most oilfields are found in anticlinal faults, or stratigraphic traps. Oil floats on water, so that it will rise to the highest point possible, above the water. If the porous or fractured sandstone or limestone that contains the oil is overlain by impervious shale, the oil can no longer rise. If the porous bed is arched upward...
Most oilfields are found in anticlinal faults, or stratigraphic traps. Oil floats on water, so that it will rise to the highest point possible, above the water. If the porous or fractured sandstone or limestone that contains the oil is overlain by impervious shale, the oil can no longer rise. If the porous bed is arched upward...
Gold Deposits in Skarn
July 2003
Skarn consists of coarse-grained calcium, magnesium, iron, and aluminum silicates formed by hydrothermal solutions, which replace limestone or dolomite near the contact with an igneous intrusion. The contact metamorphism is usually caused by an intrusion such as quartz monzonite, granodiorite, or similar rock type, which may or may not be mineralized.
Skarn consists of coarse-grained calcium, magnesium, iron, and aluminum silicates formed by hydrothermal solutions, which replace limestone or dolomite near the contact with an igneous intrusion. The contact metamorphism is usually caused by an intrusion such as quartz monzonite, granodiorite, or similar rock type, which may or may not be mineralized.
Ask The Experts—Is it possible for a mountain range to have good lode gold deposits and yet the area streams not carrying like deposits of gold?
May 2011
Q: Is it possible for a mountain range to have good lode gold deposits and yet the area streams not carrying like deposits of gold? Or do the two go hand-in-hand?
Q: Is it possible for a mountain range to have good lode gold deposits and yet the area streams not carrying like deposits of gold? Or do the two go hand-in-hand?
Miners Resume Search for Platinum Near Platinum
October 2001
Goodnews Bay Platinum Mine, owned by Hanson Industries in Spokane, Washington, has resurrected a 60-year-old bucketline dredge to claw the steel-gray metal from the river drainages around Red Mountain on Cape Nushagak.
Goodnews Bay Platinum Mine, owned by Hanson Industries in Spokane, Washington, has resurrected a 60-year-old bucketline dredge to claw the steel-gray metal from the river drainages around Red Mountain on Cape Nushagak.
Dredging Tips and Tricks: T-80 Air Compressor Maintenance
June 2020
The next morning, I retrieved the compressor and again attacked the sticky head bolt. As if by magic (and some applied physics) the head bolt sighed and finally broke loose.
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The Bawl Mill
• Greenstone Belts in Minnesota
• The Paradox Basin—Part II
• A Sleeping Giant
• Buying a Used Gold Dredge
• Looking Back
• Gold in Vermont
• Picks & Pans: Prospecting on Perry Creek
• 9th Circuit Court Hears Pilgrim Family Case
• The First Mine in America
• National Mining Hall of Fame to Induct Five
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
