History & Geology
Epithermal Gold and Silver Deposits
April 2017 by Chris Ralph
Epithermal deposits form in the ground at shallow depths. They are popular with prospectors because can yield very rich deposits and they are widespread in the Western US.
The Long Road to Gold Point, Nevada
Apart from the hard rock mines, there are abundant gold-bearing placers, especially in the areas in and around Oriental Wash.
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.
PGMs in the United States
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.
The Goldfield Mining District, Nevada—Part II
The majority of the gold produced in Goldfield has come from ores that are close enough to the surface to be oxidized by the air. This oxidized ore is normally a soft, shattered, earthy material usually stained yellow to brown by oxides of iron.
ICMJ Visits Colfax, California
February 2023Understanding and Prospecting Benches
The most obvious benches are usually near the valley floor, but they can be thousands of feet above the valley floor. Since benches were made by streams, they can contain placer deposits.
Reese River Silver Mining District, Nevada
The strike and the dip of the veins can be broken down into two categories: veins in the eastern area and along Lander Hill, and the veins in the southwestern portion of the district.
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The Bawl Mill
• Legislative and Regulatory Update
• Ask The Experts: Is an XRF gun useful for prospecting and mineral identification?
• Ask The Experts: Is this deposit worth working?
• Ask The Experts: Can a long range locator probe detect gold in quartz?
• Weathering, Erosion and Placers
• The PIGMI—a DIY Crevice Tool
• Diary of a Diamond Prospector
• The Ups and Downs of Nugget Hunting
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
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