Gold Tellurides: Tellurium, an Assay Impurity

May 2001 by Don Robinson

Mineralized Calderas in Colorado

May 2002
A caldera is a large circular volcanic depression caused by collapse due to the removal of molten magma from an underlying magma chamber. The removal of magma is due to explosive venting of lava and pyroclastic material.

Looking Back

January 2003
Excerpts from California Mining Journal, our original title, published 50 years ago this month.

The North Star Mine

December 2002
Back in the early 1800s, there was a gold mine being dug in a mining community called Garden Valley. Garden Valley is located northeast of Sacramento, between Georgetown and Coloma. They called it Garden Valley because there were some miners who thought there might be more money in growing and selling vegetables than in mining for gold.

Gold at Dale, California

May 2000
The Dale Mining district is located in the Pinto Mountains, 18 to 25 miles east and southeast of Twentynine Palms, by way of the Twentynine Palms highway and the unpaved Gold Crown road.

Drywashing and Detecting for Eluvial Placer Gold Research is the Key to Success—Part II

October 2005
Before heading out to work the same old ground, or blindly seeking a previously unknown gold placer area to drywash or detect, maybe you would benefit from doing a little research.

Gold Deposits in Skarn

July 2003
Skarn consists of coarse-grained calcium, magnesium, iron, and aluminum silicates formed by hydrothermal solutions, which replace limestone or dolomite near the contact with an igneous intrusion. The contact metamorphism is usually caused by an intrusion such as quartz monzonite, granodiorite, or similar rock type, which may or may not be mineralized.

Diamond Dealer Prevails in Congo

July 2001
The one he’s rolling around in his fingers is nice—5.23 carats, nearly the size of a marble, pure and white. But the diamond that Alphonse Ngoyi Kasanji is talking about is the big one—the one that got taken away.

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