The Trapiches of Chile
October 2000 by Dr. Ralph E. PrayIn Chile, the trapiche (tra-peach-ee) method of milling gold ore began more than 400 years ago. The first trapiche, also known as a Chilean mill, was a stone wheel weighing two or three tons rotating on an axle.
Seasonal wilderness-area rangers have been among the first to go as Forest Service managers juggle budget demands.
Hold up a glass of tap water and take a look at it. It’s about as clear as the new Yukon water regulations require the water returning to rivers to be after being used by placer miners. The new limit of 25 parts per million (ppm) sediment does not leave a lot of maneuvering room in terms of discharge.
Production of the Lithium will be completed in a 48-hour process with much less waste and a substantial increase of recovery rates from around 40% with conventional evaporation to near 90%.
The signs of copper, which the prospector most commonly sees in the field in outcrops and on the surface, are secondary minerals caused by the action of air and water on the original copper-bearing sulfides that were deposited deep...
The Bawl Mill • A Word from the Editor • Under the Guise of Environmental Protection—EPA Revealed • The Centennial Lode and the Centennial Ridge District, Wyoming • Company Notes • Picks & Pans—In Search of Nome Creek Gold • Massive Sulfide Deposits in Oregon • Recreational Dredging on the South Yuba River • Tales of Liberty Gold • Drywashing Alluvial Placers • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices