History & Geology
PGMs in the United States
August 1999 by Edgar B. Heylmun, PhD

Weathering, Erosion and Placers

The Ely Copper-Gold District of Nevada

Gold Deposits of Montana

Iron Ores and Iron Mining
For more than 40 years, iron ore prices have been decided by private negotiations conducted between the largest of the iron miners and the largest steel producers. These two sides dominate both the spot and contract iron ore markets.
What Are Those Rocks In My Pan?
The placer mineral identification key is designed to answer this question. It attempts to recognize all the minerals in your gold pan concentrates.
The Golden Days of Julian, California
Some scattered reports say that gold may have been washed from streams here as early as the 1840s, but the undisputed major discovery came in 1870.
The Many Facets of Iron

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