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Ask The Experts: How to remove precious metals from lead?
August 2010 by Thom Seal, PhD, PE
I have a large amount of precious metals, gold and silver, mixed in with lead. Cupelling is expensive. What method can I use to extract the gold and silver without cupelling?Oil Seeps in Northern California
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.
The Bawl Mill
• He did say he’d create jobs...
• Biofuels: More harm than good
• Turnpike employees get more than just a free ride
• A sinking ship...
Comments Needed On Pebble Project Draft EIS
If you do not have the time to read the entire document, I would suggest starting with the Executive Summary that begins on page 80.
Searching for Gold at Paradise Valley, Alaska
There are lots of stories about the big gold found in Alaska, but where does a prospector get the idea that it’s something the every day gold miner might get involved in? One must understand that the quest for gold in the mid-1800s brought...
Understanding Hard Rock Mining: Terms and Methods—Part II
A better understanding of hard rock mining methods and knowing a little about how these mines work can help the individual prospector to understand reports and stories about both modern and historic mine operations.
Cold Water Gold
It was June 2011, and my wife Fran and I with Grandson Lucas and good friend Ernie Cruz were attempting to get to our gold mining claim on the Middle Fork of the Feather River about ten miles from Quincy, California. Rain had poured down in the previous few days and the road in a large number of low places was under water. Following two hours of slugging through the mud...
Prospecting With a Magnetometer
Swedes were the first to note variations in the Earth's magnetic field, circa 1640, and they were the first to use the dip needle. They made the first magnetometer in 1870.
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The Bawl Mill
• Legislative and Regulatory Update
• Commercial Placer Mining With Jigs
• Ask The Experts: Bench Top Crushers
• How to Properly Ground Balance to Find the Most Gold
• Authorities Search for Lost Treasure Hunters
• Alaska Geologist Survives Grizzly Attack
• The Guaniamo Diamond Area, Venezuela—Part II
• How California Became the Golden State
• The Rocky Bar Mining District, Idaho
• Mining Stock Quotes, Mineral & Metal Prices
Free:
The Jenkins Mine Project—The Golden Rules of Science
• Melman on Gold & Silver
• ICMJ Again Matches Funds For PLP Donations
