History & Geology
PGMs in the United States
August 1999 by Edgar B. Heylmun, PhD
Until just recently, platinum-group metals (PGMs), especially palladium, had been holding their own on the market. But, Russia has now resumed shipments and it has brought prices down.
Gold Depositiion and Gradients of Placer Streams—Part II
The steeper the gradient is, the more potential erosive power to move gold and other bedload sediments, and the more power to remove obstacles to flow.
The Batteries Metal Rush
There is a major change coming in the economy of the world and now is the time for prospectors and miners to grab a ticket and get on board.
Third Largest Nugget in Existence Returns to Dallas
While the bullion value of the nugget is already substantial, the size and rarity of the Ausrox Nugget combine to make its worth invaluable in the collector market.
All About Chalcopyrite
…there are loads of different copper minerals, but a large number of them form first in the ground as chalcopyrite and then through the effects of weathering are changed into other minerals like malachite, cuprite and chrysocolla.
The Seven Troughs Mining District
The favorable geology of the northeastern and central parts of the Seven Troughs Range are the parts most interesting to prospectors. They are underlain by a thick sequence of Tertiary volcanic rocks, mostly rhyolites and andesites.
Detecting for Gold in Australia—The Kimberley Trip
The hair stood up on the back of my neck when I saw this, especially the nice patches of wash in the bottoms of the gullies, a sure sign of an auriferous source being nearby.
Las Médulas—The Gem of the Roman Gold Mines
This mine was a real wonder of engineering, and the water supply and drifts had to be carefully managed to keep it in operation. In fact, it didn’t close due to lack of gold, but instead closed with the fall of the Roman Empire.
Subscription Required:
The Bawl Mill
• Our Readers Say
• New Oregon Mining Legislation Friendly to Small Miner
• Cutbacks at S. African Mines—Britain Blamed
• BLM Reports That 'Mining' Brings Most Public Reward
• Long-Term Camping Plan at Fortymile Proposed by BLM
• "No Gold Sales" Says Nevada Senator
• Panel Cuts Park Monies, Eases Mining Restrictions
• State May Re-Examine Plans on Dredge Use Near Hope
• Company Notes
• Jim Butler's Political Career
• Picks & Pans: Gold Recovery in Placer Mining Operations
• Nevada Looks to Tourism to Fill Mining's Gap
• Miners Claim Victory in Fight That Began with Protest
• U.S. Admits Botching Indian Funds Accounts
• Gold Fever
• Roads Protecting Grizzlies Reopen
• Guanajuato Silver, Mexico
• Roosevelt: From Boom Town to Mountain Lake
• Dollar Must Slip for Gold to Rise
• Looking Back
• 1999 National Mining Hall of Fame Inductees
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
Free:
Legislative Update
