Cerro Colorado Silver, Arizona
November 1999 by Edgar B. Heylmun, PhDIt was the first mine developed by Americans in the Cadsden Purchase of 1853. A number of small near-surface mines had been operated by Spaniards and Mexicans in the region prior to the arrival of Americans, going back as far as 1740.
Palmarejo Silver & Gold Corp., based in Longueuil, Quebec, is a gold-silver exploration company reexploring a former Spanish silver district in far southwestern Chihuahua.
Dr. Ralph E. Pray
While digging a well six years ago, the owner of a backwoods camp near the Michigan-Wisconsin line cut into sparkling rock. He showed a sample to a geologist friend, who realized it was laced with zinc.
A series of coastal ranges, separated by narrow valleys, characterize coastal California south of Monterey. The mountains rise to 5,800 feet in elevation, with annual rainfall varying from 12 to 64 inches, depending on elevation and exposure.
Because the old timers were so good at locating the better paying deposits—most of them along clay seams in this particular area—it makes good sense to try and locate these clay lines at old mining sites.
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