History & Geology
Gold From Cemented Gravels
November 2011 by Chris Ralph
The truth is that cemented gravels are really not all that complex. There is no mystery of how gold grew there or somehow wormed its way into these solid gravels.Prospecting Homonyms
Three homonyms come to mind when I think of gemstones, gold and vegetables: carrot, carat and karat. Let’s look at carrot first.
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.
Gold in Quartz
Because quartz and gold may be deposited together across a considerable range of temperatures, not all quartz veins are the same, and there are several different types of gold-quartz deposits.
Strategic Metals—Part II
There are literally thousands of abandoned wasterock and ore dumps that dot the United States that could hold many tones of strategic metals.
Mohave County, Arizona: The Oatman/San Francisco Mining District
The Oatman/San Francisco Mining District’s historic gold production of 2.2 million ounces of gold since the 1880s makes this area Arizona’s greatest primary gold producing district.
Historic Dredge Uncovered in North Carolina
The Robinson is a wooden bucket-line dredge that was built in the early 1900s in New York and shipped in pieces to Nash County in North Carolina by train for reassembly.
The Goldfield Mining District -- Then and Now
In 1983, some of the ore yielded more than 2,500 ounces of gold within 30 feet of the surface. The shoot pinched to a narrow vein.
Subscription Required:
The Bawl Mill
• Legislative And Regulatory Update
• Ask The Experts—Compensation for closed mining claim?
• Ask The Experts—Inconsistent fire assays
• Evolution Of A Gold Prospect
• Gold, Quartz & Chalcedony—Part II
• Alaska to Target Rare-Earths
• Minnesota Delays Decision on Mineral Leases
• Alaska's Cripple Creek Mining District
• The Gold Of Horseshoe Bend
• Tyrie's Roadway Nugget
• Melman on Gold & Silver
Free:
Are Permits Needed For Highbanking In California?
• Prospecting Australia—Part II: There and Back Again
