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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.Strong Support at Suction Dredge Meetings
Just prior to press time, we made our way to Sacramento for the second public scoping meeting to comment on the first draft of the California Department of Fish and Game (DFG) suction dredge permitting program and the new Environmental Impact Report.
Dredging Do's and Don'ts
I’d start the day by crawling out of my dome tent, cooking up some Spam and eggs, and heating water for instant coffee on the Coleman stove.
Legislative and Regulatory Update
• Rahall bill threatens uranium mining
• California Fish & Game claims it needs more time
• Huge new tax burden on coin and bullion transactions
• Refund bill fails in Assembly Committee
Hardrock Detecting
A local mining company had been mining in the Circle mining district area creeks in interior Alaska for sixteen years. Using bulldozers, drag-lines, water pumps, and large sluicing plants, the owner-operator was very familiar with the geology...
Highbanking at the 144
My third sample location proved to be my last and most interesting. I needed to look no further.
What To Do When Gold Recovery and Assay Values Differ
Before going into an analysis of the ore composition, two other major factors will affect the result. These are the accuracy of the assay and the effectiveness of the mill for the gold recovery.
Experts Forecast Rising Prices for Gold, Silver
During the two investment conventions in Vancouver this January, the mood was incredibly upbeat. Gold was rising strongly and prospects appeared bright. The same was true at the giant PDAC gathering in Toronto in March. By late April the shine had come off the short-term prices of metals...
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