All Articles
Greenstone Belts in Minnesota
August 2005 by Edgar B. Heylmun, PhD
Greenstone is a dark greenish-black basaltic rock which, along with chloritized schist, forms belts up to 50 miles wide in northern Minnesota, in rocks of Late Archean age. Most belts are 2.6 to 2.9 billion years old.Additional articles that might interest you...
Legislative and Regulatory Update
August 2001
• The next step towards implementing the Wildlands Project
• Former timber lobbyist named to oversee Forest Service
• The next step towards implementing the Wildlands Project
• Former timber lobbyist named to oversee Forest Service
Ask the Experts
August 2007
Q: Does anyone know of an electrowinning instrument that will plate (heavy plate) rhodium and iridium? I have both in solution. (Solution content = 262.9 oz/ton of iridium; 14.9 oz/ton rhodium.)
If I have precious metals in solution in bulk, say 620 to 1,000 gallons, is there a facility to extract the precious metals out? If so, can each be isolated?
Q: Does anyone know of an electrowinning instrument that will plate (heavy plate) rhodium and iridium? I have both in solution. (Solution content = 262.9 oz/ton of iridium; 14.9 oz/ton rhodium.)
If I have precious metals in solution in bulk, say 620 to 1,000 gallons, is there a facility to extract the precious metals out? If so, can each be isolated?
Sierra County Gold—Part I
December 2013
...this county contained some of the richest placer ground found in all of California and still produces some pretty impressive finds to this day.
...this county contained some of the richest placer ground found in all of California and still produces some pretty impressive finds to this day.
Melman on Gold & Silver
March 2014
...it is beginning to appear that we are recently witnessing a gradual buildup of background information that could lend strength to the arguments for ultimately higher gold and silver prices.
...it is beginning to appear that we are recently witnessing a gradual buildup of background information that could lend strength to the arguments for ultimately higher gold and silver prices.
Ask The Experts: Potential for developing magnesite deposit
March 2017
Q: What I would like to know is how to confirm if it is magnesite and the quality.
Countries Want More Concessions From Miners
September 2006
Bulgaria has followed the recent moves of Mongolia and Venezuela, demanding renegotiation of existing agreements and more concessions from mining companies.
Bulgaria has followed the recent moves of Mongolia and Venezuela, demanding renegotiation of existing agreements and more concessions from mining companies.
Detecting Invisible Gold
April 2009
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How to find gold with a metal detector: The technology certainly has improved quite a bit over the years, so when these owners are testing various types of gold on their machines and they find that some gold responds poorly or not at all...
How to find gold with a metal detector: The technology certainly has improved quite a bit over the years, so when these owners are testing various types of gold on their machines and they find that some gold responds poorly or not at all...
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The Bawl Mill
• Our Readers Say
• 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
