All Articles
Using A Trommel For Placer Processing
April 2010 by Chris Ralph
The behavior of a trommel is dependent on how it is designed and set up. Important design characteristics include feed rates, screen perforation sizes, cylinder size, rotation speed and incline.
Additional articles that might interest you...
The Bawl Mill
November 2001
• What goes up, must come down.
• What goes up, must come down.
Looking Back
January 2006
Excerpts from California Mining Journal, our original title, published 50 years ago this month.
Excerpts from California Mining Journal, our original title, published 50 years ago this month.
Discovery of the Mountain Pass REO Deposit
May 2001
How does one go about discovering a rare earth oxide (REO) deposit when he is not familiar with the rare and unusual rocks and minerals that are found in such deposits? That was the case at Mountain Pass, California, yet the deposit was eventually discovered and mined.
How does one go about discovering a rare earth oxide (REO) deposit when he is not familiar with the rare and unusual rocks and minerals that are found in such deposits? That was the case at Mountain Pass, California, yet the deposit was eventually discovered and mined.
Small-Scale Prospecting & Mining (A Little History)
April 2005
During the 49’er gold rush, because of harsh winters and adverse river conditions, the working season could be restricted for a week or more at a time. Moreover, many of the “argonauts” (a term dating back to the adventures of the early Greek gold seekers in seeking the Golden Fleece), were unprepared both mentally and physically to meet the harsh conditions.
During the 49’er gold rush, because of harsh winters and adverse river conditions, the working season could be restricted for a week or more at a time. Moreover, many of the “argonauts” (a term dating back to the adventures of the early Greek gold seekers in seeking the Golden Fleece), were unprepared both mentally and physically to meet the harsh conditions.
Carrizozo Lava Older Than Once Thought
October 1999
The Valley of Fires lava flow outside Carrizozo is older than previously thought. In geologic terms, the central New Mexico volcanic feature is still a youngster at 5,000 years old. But that's considerably older than the 1,000-year-old tag scientists once placed on it...
The Valley of Fires lava flow outside Carrizozo is older than previously thought. In geologic terms, the central New Mexico volcanic feature is still a youngster at 5,000 years old. But that's considerably older than the 1,000-year-old tag scientists once placed on it...
Working on the Bear River
January 2007
Further downstream our motorized equipment was in play. One power sluice was going a lot, with a crew of four getting familiar with the equipment and working hard to create a holding pond to prohibit the muddy water and the...
Further downstream our motorized equipment was in play. One power sluice was going a lot, with a crew of four getting familiar with the equipment and working hard to create a holding pond to prohibit the muddy water and the...
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The Bawl Mill
• Legislative and Regulatory Update
• Prospecting for Hardrock Gold - Part II
• Gold in Alaska - Part II
• Gold Prospecting in Maine - Part I
• Gold Prospecting Is For Ladies, Too
• Sage-Grouse Won't Get ESA Listing For Now
• How to Find Gold in Hot Ground With A VLF Detector
• Oregon County Tries to Interfere With Lawful Mining Operation
• Melman on Gold & Silver
• Mining Stock Quotes & Mineral and Metal Prices
