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Oil Seeps in Northern California
July 2001 by Edgar B. Heylmun, PhD
Indians used asphalt from oil seeps in California for caulking boats and other objects long before the white man arrived. Spaniards noted seeps as early as 1542, and the Portola expedition in 1769 used oil for wagon axles and as a fuel. Spaniards also used crude stills for obtaining lamp oil for use in the missions.Ask The Experts - Where can I get geological maps?
A New Look at Old Mines
Exploration companies are actively looking for properties with profitable potential, even if the ground was once cast off as too low in grade to be economically viable. This is especially true in states that are reasonably friendly toward...
Hands-on at Iowa Hill
A number of crevices were still waiting to be cleaned out. A lot of the gold remaining in the pit was very fine sized, but a few small nuggets were also recovered.
Exploring The Historic Rand Mining District, Southern California
My largest nugget from this area is almost one-half ounce. I’ve found several smaller chunks and many pickers in addition to the fines and flakes that I put in my poke.
Prospecting for Diamonds
Let’s take a look at diamonds and diamond mining and see how they form, how they are used beyond just jewelry, and what leads geologists to find diamond deposits.
Proper Placer Sample Processing
...your sampling procedures should not be designed to catch gold your mining technique will never recover.
The Carson City Mint
In the early 1860s, the rich mines of Virginia City and the surrounding area were pouring forth millions of dollars in gold and silver each year. Additional mines located at White Pine, Aurora, Humboldt and other Nevada locations were also yielding millions in gold and silver.
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