Cyanide-Free Gold Separation
February 2011 by Chris RalphSome ores—mostly those with a high free gold content—are very amenable to gravity concentration. Well oxidized ores containing coarse gold are usually best for non-cyanide processes. Ores with significant sulfide content may require the...
The problem is that extracting gold from hard rock is often a lot more difficult than processing placer gravels. Still, there is some very high-grade ore out there in many old mining areas.
Buying a placer claim or investing in a placer mining property comes with plenty of financial risks. You need as much information as possible about the mineral deposit in order to minimize those risks.
One of his friends had 700 feet of small-gauge mine track and a hundred-year-old track bender laying out in his back 40; plus he also wanted to join the team. Perfect.
Depending on the ore and if significant sulfides are present, a hard rock miner may be able to get away with simply using a flux to digest the other minerals that may be present.
The 15 rare earth elements were discovered long after the gold rush began to wane, but demand for them only took off over the past 10 years...
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.
On my weekends off I spent many hours dredging the Second Broad River from Cane Creek Road up to the headwaters. I used a three-inch dredge with air and graduated to a five-inch with air.
The Bawl Mill • Our Readers Say • The Basics of Crushing and Milling Operations • Ask The Experts—What minerals are magnetic? Can rare earth magnets capture platinum? • Ask The Experts—Jet nozzle or suction nozzle? Which is best for my highbanker? • Ask The Experts—Precious metals in water? • Rediscovering Placerville, California • Eastern Arizona: Gold and Base Metal Deposits—Part I • Over The Divide—Daryl J. Nelson • Legislative and Regulatory Update • Mining Stock Quotes & Mineral and Metal Prices • Melman on Gold & Silver