Small Mining Operations
Cyanide-Free Gold Separation
February 2011 by Chris Ralph
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...
Additional articles that might interest you...
Crushing Quartz in Calaveras County: A Placer Miner Learns New Tricks
June 2014
I had never run an impact mill before, but anything involving rocks, water and a big electric motor sounded great.
I had never run an impact mill before, but anything involving rocks, water and a big electric motor sounded great.
The Heavy Minerals in Your Concentrates
June 2016
The fact that mineral deposits can contribute specific types of heavy minerals is why the analysis of the heavy mineral concentrates in the streams of an area can be an important prospecting technique for finding undiscovered mineral deposits.
The fact that mineral deposits can contribute specific types of heavy minerals is why the analysis of the heavy mineral concentrates in the streams of an area can be an important prospecting technique for finding undiscovered mineral deposits.
A Few Methods for Sampling Hardrock Deposits
June 2014
With a little homework and a methodical approach to sampling, a prospector can determine if a deposit is worthy of more of an investment...
With a little homework and a methodical approach to sampling, a prospector can determine if a deposit is worthy of more of an investment...
Gold Recovery with Centrifugal Bowls
July 2014
Centrifugal bowls are very efficient, and with proper operation they can consistently achieve gold recoveries above 95% with gold of about 50 mesh size.
Centrifugal bowls are very efficient, and with proper operation they can consistently achieve gold recoveries above 95% with gold of about 50 mesh size.
The Basics of Crushing and Milling Operations
February 2011
In processing gold, silver and other valuable ores, the minerals containing the values, such as metallic gold, silver-bearing sulfides or other minerals, must be freed from the surrounding host rock before those valuable minerals can be captured.
In processing gold, silver and other valuable ores, the minerals containing the values, such as metallic gold, silver-bearing sulfides or other minerals, must be freed from the surrounding host rock before those valuable minerals can be captured.
Nome Offshore Dredging Creates Challenges
June 2015
The Alaska state government has been trying to keep up with and maybe even stay on top of the situation by studying the problems associated with rapid growth and how to solve them.
The Alaska state government has been trying to keep up with and maybe even stay on top of the situation by studying the problems associated with rapid growth and how to solve them.
One of the Richest Beaches Ever Mined
April 2015
Everyone has heard of the golden beach at Nome, but Nome did not have the richest beach.
Everyone has heard of the golden beach at Nome, but Nome did not have the richest beach.
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• The Basics of Crushing and Milling Operations
• Ask The Experts—What minerals are magnetic? Can rare earth magnets capture platinum?
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• 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
