History & Geology
Exploring A Historic Lode Mine
August 2016 by James Erhart
Climbing up the debris, I pointed my flashlight up a shaft ascending straight up as far as my light would shine. It was the stope of the pay shoot leading to the old tunnel above!Mineralized Faults and Contacts in the Search for Gold
Fault zones and rock contacts are important because the vast majority of gold and silver deposits, as well as those of many other metals, are formed by hot, mineralized water solutions.Gold, Quartz & Chalcedony—Part II
The specific gravity of chalcedony is 2.58 to 2.64. This is slightly lower than coarsely crystalline quartz because of slight porosity in chalcedony. Being so light, it will easily wash out of a gold pan.
Arizona's Vulture Gold Mine and Lost Dutchman
When prospectors and treasure hunters talk of gold in Arizona, it is the Lost Dutchman or Vulture mine they usually think of. The Lost Dutchman gold mine is just that—a myth chalked full of holes that has been embellished over time as any good legend should be.
Copper Deposits of Alaska
Only the famous Kennecott copper mine was able to continue operating through the Depression owing to the exceptional richness of its ore.
Jadeite in California
...two jadeite locations in California have been thoroughly researched by geologists. There are no doubt others that lie in wait.
It Pays to Know Your Bedrock
On our last trip, we brought ropes and went down the first waterfall forty vertical feet, only to be confronted by a second, sixty-foot-high, overhanging waterfall that emptied into a slot canyon.
Iron Ores and Iron Mining
For more than 40 years, iron ore prices have been decided by private negotiations conducted between the largest of the iron miners and the largest steel producers. These two sides dominate both the spot and contract iron ore markets.
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The Bawl Mill
• Legislative and Regulatory Update
• Ask The Experts
• Ask The Experts
• Revisiting the Rocker Box
• Can You Recognize Valuable Ores?
• Follow Up to "Just One More Time"
• The Highs and Lows of Drywashing
• Successful Detecting Requires Attention to Detail—Part I
• Panning for Gold on Canyon Creek
• China Closing More Than 1,000 Mines
• Habits, Procedure, and Where Is The Gold?
• Mining Stock Quotes and Mineral & Metal Prices
• Melman on Gold & Silver
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