When no more silver deposits on the copper

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• Silver mining in the United States — began on a major scale with the discovery of the Comstock Lode in Nevada in 1858. The industry suffered greatly from the demonetization of silver in 1873 by the Crime of 73, but silver mining continues today.The United States produced 1,200… …   Wikipedia

• Copper mining in the United States — US primary copper production 1900 2008. Source: USGS …   Wikipedia

• Silver — This article is about the chemical element. For the color, see Silver (color). For other uses, see Silver (disambiguation). palladium ← silver → cadmium …   Wikipedia

• Copper extraction techniques — This article is about historical production methods. For modern methods, see Flash smelting. The Chino open pit copper mine in New Mexico …   Wikipedia

• Silver mining in Arizona — was a powerful stimulus for exploration and prospecting in early Arizona. Cumulative silver production through 1981 totaled 490 million troy ounces (15 million kg). [Melissa Keane and A. E. Rogge (1992) Gold Silver Mining in Arizona, Arizona… …   Wikipedia

• The United States of America —     The United States of America     † Catholic Encyclopedia ► The United States of America     BOUNDARIES AND AREA     On the east the boundary is formed by the St. Croix River and an arbitrary line to the St. John, and on the north by the… …   Catholic encyclopedia

• Silver mining in Colorado — Silver mining in Colorado, a state of the United States has taken place since the 1860s. In the past, Colorado called itself the Silver state . (Nevada also calls itself the Silver state ; in reality, the US state which has produced the most… …   Wikipedia

• Copper toxicity — Classification and external resources A Kayser Fleischer ring. Copper deposits are found in the cornea. This is an indication that the body is not metabolizing copper properly. ICD 10 …   Wikipedia

• Silver City, Pinos Altos and Mogollon Railroad — (SC,PA M) was a 2 foot narrow gauge railway serving copper mines along the Continental Divide [Shaw 1958 p.177] in the mountains of southwestern New Mexico. The communities of Silver City and Pinos Altos developed as 19th century miners recovered …   Wikipedia

• Copper mining in Michigan — While it originated thousands of years earlier, copper mining in Michigan became an important industry in the 19th and early 20th centuries. Its rise marked the start of copper mining as a major industry in the United States. Contents 1 Geology 2 …   Wikipedia

• copper processing — Introduction  use of smelting or leaching, usually followed by electrolytic refining or recovery, to turn the ore into a form from which products can be fashioned. Included in this article also is a discussion of the mining of copper and of its… …   Universalium