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  • copper. - USGS

    The distribution of the copper mines of the country is shown in PI. III. ..... for over half a mile into the limestone and, being above timber line, it is well exposed,.

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  • Nonpetroleum Minerals

    Past production of limestone for use as dimension stone has been reported in ... During the period from 1895–1943, Texas mines produced more than 25 million tons ... Coal deposits in the Trans-Pecos country of West Texas include those in the ... Chief output was from the Hazel copper-silver mine of Culberson County that...

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  • Mineral Industry - State of Michigan

    the iron ore and copper mining industries during those years was most ... Michigan has led the nation almost uninterruptedly since. 1880, is a ... of iron ore, gypsum and limestone; fourth in production of cement ... leading producer of copper in the nation. However ... Some mines are more than a mile in vertical depth below.

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  • COPPER.

    for a mile or two south of the McConnell and Western Nevada mines but is cut off ..... The country rock of the ore is limestone, which.shows much local alteration.

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  • The Gold Mines of Missouri. - IMPORTANT DISCOVERY OF GOLD ...

    Having just returned from the recently-discovered gold mines in Madison County, ... This valley is five miles wide, formed of limestone, and surrounded by hills of ... The noted mines of lead and copper, known as the La Motte, are in this ... the gold discovery, the country is made up of valleys under laid by limestone, and...

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  • The Nonfuel Mineral Resources of Pennsylvania - DCNR

    David (Duff) Gold, consulting geologists; Tom Holleran, Aggregates Mining and Min- erals, Inc.; Johnny .... Altogether, in 2003, Pennsylvania was the nation's tenth largest producer ... struction, this would be enough to pave about 700 miles of four-lane high- ways. ..... ing copper, aluminum, limestone, and marble. The use of...

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  • Copper mining in the United States - Wikipedia

    Copper mining in the United States has been a major industry since the rise of the northern ..... Butte, Montana was once the nation's most prolific copper-mining district. ... ore bodies are contact metamorphic replacement deposits in limestone. .... At least five copper mines operated along a belt 20 miles long and oriented...

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  • Explosives - Mining Types - GlobalSecurity.org

    Jul 7, 2011 ... Mining is the search for, extraction, and beneficiation and ... Low-cost coal is used to generate a large portion of the nation's ... also the largest surface mine in the US, measuring approximately 2 miles in .... Open-pit mining is the primary domestic source of copper. ... One product of limestone mining is lime.

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  • Silver mining in the United States - Wikipedia

    Silver mining in the United States began on a major scale with the discovery of the Comstock ... Alaska was the country's leading silver-producing State, followed by Nevada and Idaho. ... More than 80% of the state's silver was a byproduct of copper mining; other silver came as a byproduct of lead, zinc, and gold mining.

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  • Limestone: The Calcium Carbonate Chemical Sedimentary Rock

    Portland cement is essential to the building industry, but despite our Nation's ... Sedimentary limestone deposits can be extensive, covering hundreds of square miles, ... Therefore, limestone quarries can be large and long lived, mining limestone ... making lime (CaO) that is used to treat soils, purify water, and smelt copper.

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