All Articles
The Ocampo District, Chihuahua
April 2003 by Edgar B. Heylmun, PhD
The village of Ocampo is wedged in a canyon about 178 miles, by Mexican Highway 16, west of the city of Chihuahua. It is a few miles west of Basaseachic Falls, and a few miles south of Highway 16, in high chaparral at an elevation of 6,500 feet. The completion of Highway 16 across the Sierra Madre Occidental greatly improved access to the region...Additional articles that might interest you...
Mining Stock Quotes and Mineral & Metal Prices
August 2017
The Fire Assay of Fly Eyes
July 2002
Colorado-Utah-Wyoming oil shale was first reliably discovered to contain gold and silver by the U.S. Bureau of Mines in the 1920s. Although most of this vast shale resource, up to 1,000 feet in thickness, contained nil or barely detectable values, many brown shale samples fire assayed here over the past thirty years have yielded up to 0.02 ounces per ton (opt) Au and 2.0 opt Ag.
Colorado-Utah-Wyoming oil shale was first reliably discovered to contain gold and silver by the U.S. Bureau of Mines in the 1920s. Although most of this vast shale resource, up to 1,000 feet in thickness, contained nil or barely detectable values, many brown shale samples fire assayed here over the past thirty years have yielded up to 0.02 ounces per ton (opt) Au and 2.0 opt Ag.
The Goldfield Mining District -- Then and Now
March 2017
In 1983, some of the ore yielded more than 2,500 ounces of gold within 30 feet of the surface. The shoot pinched to a narrow vein.
In 1983, some of the ore yielded more than 2,500 ounces of gold within 30 feet of the surface. The shoot pinched to a narrow vein.
California State and US National Gold Panning Championships
November 2018
This was two days of gold panning, with just over 250 gold panners trying to win a medal to show they were one of the best of the best.
Mining Stock Quotes
September 2008
Nevada's Lithium Boom
March 2017
When prospecting for lithium, after confirming for macro attributes through research and field work, including examination of surface geology, the main tool is an accurate lithium assay.
When prospecting for lithium, after confirming for macro attributes through research and field work, including examination of surface geology, the main tool is an accurate lithium assay.
The Furnace Atmosphere During the Fire Assay
January 2001
It has been claimed that the introduction of excess air to the assay furnace during sample fusion can materially increase the gold yield. Testimony by expert witnesses for the defense in recent federal hearings dealing with the dependability of the gold fire assay includes data purported to show this.
It has been claimed that the introduction of excess air to the assay furnace during sample fusion can materially increase the gold yield. Testimony by expert witnesses for the defense in recent federal hearings dealing with the dependability of the gold fire assay includes data purported to show this.
Subscription Required:
The Bawl Mill
• Impact of Habitat Designations Grossly Underestimated
• Manslaughter Charges Dropped Against Sixteen to One Mine
• A Unique Prospecting Method
• Over the Divide
• Cripple Creek, Colorado
• Picks & Pans: Virginia Prospecting
• PLP Gets the Key!
• Mariposa, California
• The Collaboration
• Mud Creek Placer Mine
• Mining Stock Quotes and Mineral & Metal Prices
• Looking Back
• Melman on Gold & Silver
