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History & Geology

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Geology and stories from the past

Ganes Creek After The Flood


Doug told me that there had been a 100-year flood that took place in October of 2013 and it washed out part of the mile-long landing strip. It also washed a large, wide gully down below and above the camp.

Gold Ores of the Delamar District, Nevada


Even as late as 1906, Delamar was second only to Tonopah and Goldfield in production outshining many better known areas. Since the first discoveries, more than 700,000 ounces of gold have been produced from the mines here.

The Giant King Mine


Most gold-bearing veins in this region are controlled by fractures associated with the Melones Fault, a late Cretaceous structure that is 108 to 127 million years old.
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Picks & Pans: Gold Recovery in Placer Mining Operations


Two of the major factors affecting the profitability of a placer mining enterprise are the relative efficiency of the mining equipment, and the rate and percentage of recovery obtained while conducting mining operations.

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.
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Silver and Base Metal Deposits of the Pioche District


The areas that were mineralized with the bedded ore were huge and vast tonnages were indicated, although they had no idea at the time.

Round Mountain, Nevada


There are a number of veins in the disseminated mineralization, but the principle ones on Round Mountain are known as the Los Gazabo and the Keane.

Gold Deposits of the Ivory Coast


Ivory Coast has considerable gold reserves, and this nation has the largest area of greenstone belts prospective for gold in the continent.
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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.

Gold of the Iditarod Mining District, Alaska


It was the middle of winter and the valley was covered in snow, making prospecting a matter of sinking shafts in the ground.

Natural Gold Alloys


Natural gold is never 100% pure; all natural nuggets contain at least some impurities. We're going to take a look at just what some of those impurities might be.
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Eolian Gold Deposits


Prospectors who specialize in electronic detecting for nuggets in desert areas are especially interested in this type of deposit, as it yields nuggets that are close to the surface of the ground...

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.

Critical Metals: Lithium


Prospecting for lithium deposits can take a number of different directions, because this metal can be extracted from a variety of geologically differnet sources.
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Sierra County Gold—Part II


...we will continue our examination of the rich streams and mining districts, and then take a look at some of the big nuggets that have been found here.

The Silver Islet Mountains of Utah


Apparent fault offset.I set up my dry washer on the north side of the cut and sampled the bed rock and dumps around me. As I was only sampling, I ran for 20-30 minutes, shoveling from a variety of areas.

Gold Placers of the Kenai Peninsula, Alaska


The biggest obstacle is that like many streams on the Kenai Peninsula, high water during the summer months from snow melt and rain can make dredging nearly impossible. The best dredging is in the colder months of the year.
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Prospecting for Diamonds in Kimberlite


Kimberlite is very difficult for geologists to find, let alone prospectors and rock hounds. This is because kimberlite is rarely exposed on the surface and few people know how to identify the rock.

Sierra County Gold—Part I


...this county contained some of the richest placer ground found in all of California and still produces some pretty impressive finds to this day.

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