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2. Open-pit mining - Wikipedia

   en.wikipedia.org/wiki/Open-pit_mining

   Open-pit mining, also known as open-cast or open-cut mining and in larger contexts mega-mining, [1] is a surface mining technique that extracts rock or minerals from the earth. Open-pit mines are used when deposits of commercially useful ore or rocks are found near the surface where the overburden is relatively thin.

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4. Berkeley Pit - Wikipedia

   en.wikipedia.org/wiki/Berkeley_Pit

   The open-pit style of mining superseded underground operations because it was far more economical and much less dangerous than underground mining. Within the first year of operation, the pit extracted 17,000 tons of ore per day at a grade of 0.75% copper. Ultimately, about 1,000,000,000 tons of material were mined from the Berkeley Pit.

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   This will pit Amazon October Prime Day (running October 8 - 9) deals against Walmart's biggest savings event since the summer. You can expect discounts on products in virtually every category ...

6. Mining in Bolivia - Wikipedia

   en.wikipedia.org/wiki/Mining_in_Bolivia

   Among Bolivia's largest mining facilities is the San Cristóbal mining complex, an open-pit silver, lead and zinc mine near the town of San Cristóbal, Potosí. The mine, operated by Sumitomo Corporation , produces approximately 1,300 metric tons of zinc-silver ore and 300 tons of lead-silver ore per day, as of August 2010 [update] , [ 12 ] by ...

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8. Inland Steel Company - Wikipedia

   en.wikipedia.org/wiki/Inland_Steel_Company

   The company's fifth open hearth furnace had just been completed, and the daily production capacity of open hearth steel was 500 tons. [38] The "Madeline" blast furnace, with a rated capacity of 350 tons/day, was blown in on August 31, 1907. [39] A blast furnace heats iron ore, limestone, and coke to a temperature of at least 3000 degrees ...

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