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It 39 s simple yet effective design made it a valuable tool for the early prospectors to process ore on location without having to transport tons of material to a stamp mill Arrastras were designed to extract the valuable gold or silver that was locked in host material Unlike placer mining gold that is mined from lode sources require nbsp

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17 Jun 2016 These drag stones weigh from 200 to 1 000 lbs each their forward ends by the grinding stones is equal to from 6 to 10 per cent of the ore crushed Used commonly in Chilean gold ore processing the edge mill has two nbsp

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A mill is a device that breaks solid materials into smaller pieces by grinding crushing or cutting SAG mills are primarily used at gold copper and platinum mines with applications also in the A similar type of intermediate crusher is the edge runner which consists of a circular pan with two or more heavy wheels known as

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I frequently investigate gold mines from the 1800 39 s Before commencing to grind again the crevices between the stones covering the floor of the rastra about

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Because of this these mines have tunnels to get to the quartz and some sort of equipment to break the quartz to a powder so the gold can be removed required for making a horizontal shaft to this is attached one or more large stones and these being drawn around by donkey or mule power grind the quartz to powder

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