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Gold in Jasperoid
February 2000 by Edgar B. Heylmun, PhD
Jasperoid is a jasper-like siliceous rock, in which chalcedony or cryptocrystalline quartz has replaced limestone, dolomite, or shale. It forms the gangue of many important ore bodies. It is stained by iron and manganese oxides into shades of...
Looking Back
Excerpts from California Mining Journal, our original title, published 50 years ago this month.
Ask the Experts
Marketing other minerals recovered while gold mining
The Bawl Mill
Administration Considers Bypassing Congress
With Congress showing little willingness to act, the Clinton administration is weighing whether to designate a dozen scenic and historic sites in the West as federal monuments to assure their protection.
Now Is The Time For Exploration
I’ve been following the precious metals for decades, and I haven’t seen a move this powerful in many years.
All That Glitters is Gold
Or is it? These man-made nuggets first started appearing on some of the Internet auction sites in the summer of 1999, at which time I became a little suspicious and purchased two of them.
The Fire Assay of Carbon
Carbon, activated charcoal, or “char,” as some old timers refer to it, can be an assayer’s nightmare.
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The Bawl Mill
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