Small Mining Operations
Gold Recovery with Centrifugal Bowls
July 2014 by Chris Ralph
Centrifugal bowls are very efficient, and with proper operation they can consistently achieve gold recoveries above 95% with gold of about 50 mesh size.
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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Any good books on mineralized faults and contacts?
Small-Scale Processing of Hard Rock Ores
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.
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• Making a noisy dredge more quiet
A Father’s Day to Remember: 24,000 Ounces Gold in Quartz
Father’s Day in Australia was on September 2, and it’s a day a group of miners from “down under” won’t soon forget.
Cyanide-Free Gold Separation
Some 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...
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NOI or POO for small backhoe
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The Bawl Mill
• A Return to Silver City, Idaho
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• Swing and a Miss
• Miners Fight Back Against Road Closures
• The Giant King Mine
• BLM Flexes Its Muscles in Quartzsite
• Over the Divide
• Romancing the Lens
• Mining on the Comstock Lode
• Want to Go to Australia?
• Melman on Gold & Silver
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• Representative Manweller Lends a Hand in Washington State
