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  • 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 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

  • Gilman, Colorado — Infobox Settlement official name = Gilman, Colorado other name = native name = nickname = settlement type = Town motto = imagesize = image caption = flag size = image seal size = image shield = shield size = image blank emblem = blank emblem type …   Wikipedia

  • Ophir, North Carolina — Coordinates: 35°28′41″N 79°58′44″W / 35.47806°N 79.97889°W / 35.47806; 79.97889 Ophir is an unincorporated community in the north cent …   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

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