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September 1999 by Staff
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Company Notes
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• ESG Canada
• Vista Gold Corp.
Corralling Those Pesky Platinum Group Metals
Some assay beads disappear, collapse, hide under the surface, or spread out flat while being cupelled, just as the last tiny bit of liquid litharge is driven off. This is especially true of platinum, iridium and osmium, when attempting to re-bead the filtered residue from a parted bead.
Guest Editorial—Globalizing Mining in America, Part II
Defeating the Biodiversity Treaty
How PGMs Affect Assay Beads
Most fire assayers are trained to observe the cupelled beads very carefully, noting any discoloring or surface roughness that might indicate that one or more of the platinum group metals (PGMs) are present. The “clues and tests” I have included in this article stem from several sources, including my 35 years of experience performing torch assays...
The Mysterious Telluride Minerals
…let’s dive in and take a closer look at these rich gold and silver-bearing minerals to find out what they are, where they form, and how to identify them.
A Test Grid Dredged for Gold Values
The evaluation must also consider the gold fineness or purity. The purity of the Sugardaddy nuggets is estimated at 850 fineness, meaning 85% is gold (Au), 12% is silver (Ag) with 3% being other gangue alloyed metal.
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The Bawl Mill
• Over the Divide
• Feds Eye Restrictions on AZ Archaeological Sites
• IMF Reconsidering Gold Sales to Finance Debt
• Governors Focus on Aid for Laid-off Miners
• Nevada Counties, Towns Get Forest Service Grants
• Labor Dept. Approves Aid to Laid-off Nevada Miners
• Company Notes
• ISEE Celebrates 25 Years
• Picks & Pans: Basic Dry Washing Operations in Gold Placer Mining
• Washington Miner Wins Poetry Contest
• Gold Coin Sales Boosted by Low Prices
• The Klamath Mountains
• Silver Posts Best Price in 11 Years—Strong Investment Interest and Steady Demand Cited
• Platinum—Group Metals
• Historic Mining at Mount Diablo, CA
• Gold in the Drum Mountains
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
• Looking Back
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