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Sep 08 2008 · The three principal metals copper gold and molybdenum are disseminated as tiny grains through the more than 4 5 billion tons of rock and the cheapest most efficient way to extract them is by open pit mining The initial Pebble Mine find touched off Alaska s greatest gold rush frenzy since statehood and by 2005 companies had

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Metallurgical ContentTube Mill CapacityPebble Mill CapacityPEBBLE MILL LINERSPEBBLE MILL GRINDING MEDIA Essentially tube mills and pebble mills may be considered as ball mills the basic difference being that the ratio of length to diameter is greater Usually the shell length is between 2 and 5 times the diameter These mills are primarily used to grind various materials to 100 mesh and finer


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The Pebble Project is a copper gold molybdenum porphyry deposit in the advanced exploration stage The project is located on state land in the Bristol Bay Region of southwest Alaska approximately 17 miles northwest of the community of Iliamna Pebble consists of two contiguous deposits

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The inside of the mill is lined with lifting plates to lift the material inside the mill where it then falls off the plates onto the rest of the ore charge SAG mills are primarily used at gold copper and platinum mines with applications also in the lead zinc silver alumina and nickel industries Pebble mill

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Nov 15 2017 · The fight over the proposed Pebble mine in southern Alaska is a harbinger Global copper demand is expected to grow dramatically 8 Minute Read By Julia Rosen PUBLISHED November 15 2017

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It was found that a rod mill grind to approximately minus 6 mesh produced a feed to the pebble mill which could be ground efficiently with a minus 2 ½ plus 1 ½ inch pebble Grinding power requirements totalled 10 7 net kwh ton of rod mill feed and pebble consumption in the 4 ft diameter pebble mill was 3 1 of the total circuit feed


INCREASING SAG MILL CAPACITY AT THE COPPER MOUNTAIN MINE THROUGH THE ADDITION OF A PRE CRUSHING CIRCUIT The circuit consists of a 34 x 20 EGL SAG mill a Raptor 900 pebble crusher and two 24 x 39 6 ball mills Each mill is equipped with a 2 x 8500HP dual pinion drive system The plant was designed to process 1585 h mtpof SAG


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Mar 02 2017 · Tim Sohn reports on Alaska s Pebble Mine a contentious proposal that after more than a decade in limbo could move forward under President Donald Trump

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The proposed Pebble Mine is located in Southwest Alaska on state land near Lake Iliamna and Lake Clark and is situated atop the largest known gold deposit in the world If built the mine would be North America s largest gold and copper mine potentially producing hundreds of

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