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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. In contrast, deeper mineral ...
The workings include a large open pit mine 2.4 kilometres (1.5 mi) wide at the surface completed in 2019, three operating underground mines (Grasberg Block Cave, Deep Mill Level Zone and Big Gossan) and four concentrators. The mine is a high-volume, low-cost underground mining operation, producing and milling more than 72 million tonnes of ore ...
The Ok Tedi Mine is an open-pit copper and gold mine in Papua New Guinea located near the headwaters of the Ok Tedi River, in the Star Mountains Rural LLG of the North Fly District of the Western Province of Papua New Guinea. The mine is operated by Ok Tedi Mining (OTM), which is majority-owned by the PNG Sustainable Development Program Limited ...
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Hull–Rust–Mahoning Open Pit Iron Mine; Hutti Gold Mines Limited; J. Jagersfontein Mine; Jwaneng diamond mine; K. Kanichee Mine; Konin Coal Mine; Kostolac coal mine;
Lihir is an open cut gold mine operating on Lihir Island in the Bismarck Archipelago. It is wholly owned by Newcrest . The company, incorporated in Papua New Guinea in June 1995, and named Lihir as its first project was to raise capital to build the Lihir Island gold mine was merged with Newcrest Mining at the end of August 2010 (the last day ...
Hydraulic mining in an open pit, California, ca.1880-1900 Photograph of a hydraulic mining operation in an open pit, California, ca.1880-1900. Several water pipelines and wooden chutes crisscross the bottom of the pit. Piles of rocks and debris litter the floor of the open pit. One worker is visible in the pit near a spout gushing water.
Hull–Rust–Mahoning Open Pit Iron Mine – largest open pit iron mine in the world, near Hibbing, Minnesota [7] Lavender Pit – copper mine in Cochise County, Arizona; Morenci Mine – copper mine in Greenlee County, Arizona; Mountain Iron Mine – iron mine in Mountain Iron, Minnesota; Robinson Mine – copper and gold mine in Ruth, Nevada [8]