All Articles
Placer Gemstones
December 2001 by Edgar B. Heylmun, PhD
Only the so-called “precious gems” will be considered in this article. They are diamond, ruby, sapphire, and emerald. A “gem” must be rare, hard, and durable, and possess a unique color or quality in order to be classified as a gem.Additional articles that might interest you...
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.
Legislative and Regulatory Update
February 2014
• Not so happy birthday
• Even more support for the PLP
• Not so happy birthday
• Even more support for the PLP
Angkor Gold's Cambodia Projects
May 2013
Several nations around the world are working diligently to make their countries more attractive to resource development as a means of improving economic development. One such nation is Cambodia, located west of Vietnam, south of Laos and due east of Thailand.
Several nations around the world are working diligently to make their countries more attractive to resource development as a means of improving economic development. One such nation is Cambodia, located west of Vietnam, south of Laos and due east of Thailand.
Rio Tinto: Allegations Without Foundation
August 2009
Bribery allegations against four Rio Tinto employees detained in China are “wholly without foundation,” the mining company said, as Australia continued to press Beijing for details of a case that is straining ties between the two nations.
Bribery allegations against four Rio Tinto employees detained in China are “wholly without foundation,” the mining company said, as Australia continued to press Beijing for details of a case that is straining ties between the two nations.
Placer Gold in the Ortiz Mountains
January 2009
New Mexico’s Ortiz Mountains rise in irregular volcanic peaks above the surrounding plains, or llano, some 30 miles northeast of Albuquerque and about 14 miles to the south of my home outside the state capital of Santa Fe.
New Mexico’s Ortiz Mountains rise in irregular volcanic peaks above the surrounding plains, or llano, some 30 miles northeast of Albuquerque and about 14 miles to the south of my home outside the state capital of Santa Fe.
Idaho Silver Miners Come to Aid of Tsunami Victims
March 2005
The Bunker Hill Mine is doing its part to help tsunami victims by sending crates of bandages impregnated with silver to Indonesia.
The Bunker Hill Mine is doing its part to help tsunami victims by sending crates of bandages impregnated with silver to Indonesia.
Time to Come Home
December 2018
The need to bring mining back to North America is more urgent than ever.
Subscription Required:
The Bawl Mill
• Our Readers Say
• 43 CFR 3809 Update
• Breccia Pipes
• Newmont Tries to Become World's Largest
• The Final Gold Strike of the Alaska Gold Rush—Livengood Stampede, 1914
• GATA Update
• Aussie Gold—A Look at Queensland
• Montana's Virginia City Has Golden Legacy
• Picks & Pans: Lost Below
• Gold in Iceland?
• Mining Stock Quotes and Mineral & Metal Prices
• Melman on Gold & Silver
