All Articles
Double-D Coils and Their Place in the Goldfields
December 2009 by Gus Peppley
![](/UserFiles/file/200912/TOC-double-d.jpg)
Additional articles that might interest you...
A Model Mining Operation
August 2014
After he excavates the ore down to bedrock, he goes over the bedrock with a metal detector to ensure he didn't leave any gold behind before he backfills the area.
![](http://www.icmj.com/userfiles/images/201408/TOC-model-mining.jpg)
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.
![](http://www.icmj.com/userfiles/images/201407/TOC-bowls.jpg)
Legislative and Regulatory Update
August 2013
• Oregon passes SB 838
• Meanwhile, in California
• Oregon passes SB 838
• Meanwhile, in California
Hillside Placers
July 2003
Hills and mountains that contain gold deposits will weather and erode over a long period of time, and the eroded material will move slowly downhill. Frost wedging and roots are two of several agents that can cause bedrock to be fractured and...
![](http://www.icmj.com/userfiles/images/200307/TOC-37-hillside-placers.jpg)
Ask the Experts
November 2012
How do I set up a small placer operation?
How do I set up a small placer operation?
Subscription Required:
The Bawl Mill
• Legislative and Regulatory Update
• Small-Scale Mining, Milling and Recovery
• Judge Rules Against Oregon Miner
• Shirttail Creek
• A Modern Gold Rush In Sudan
• Melman on Gold & Silver
Free:
Golden Hope's Bellechasse Gold Project
• Where to Prospect for Gold in Colorado
• Strong Support at Suction Dredge Meetings