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SIDEBAR 3 1 Examples of Environmental and Health Concerns That Should Be increasingly sophisticated analytical techniques and equipment developed in the past Hydraulic mining is used for placer deposits of gold tin and other metals allow for some processing before the ore reaches the final process mills

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Gold mining is the resource extraction of gold by mining As of 2016 the world s largest gold producer was China with 463 7 tonnes The second largest producer Australia mined 287 3 tonnes in the same year followed by Russia with 274 4 tonnes History A miner underground at Pumsaint gold mine Wales c 1938 Landscape of Las Médulas

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A mill is a device that breaks solid materials into smaller pieces by grinding crushing or cutting Such comminution is an important unit operation in many processes There are many different types of mills and many types of materials processed in them SAG mills are primarily used at gold copper and platinum mines with

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Placer mining is the mining of stream bed alluvial deposits for minerals This may be done by Hydraulic mining methods such as hushing were used widely by the One of the largest sites was at Las Médulas where seven 30 mile long deposit is located by gold panning the miner usually shifts to equipment that can

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This may be done by open pit also called open cast mining or by various surface excavating equipment or tunnelling equipment Placer mining is frequently used for precious metal deposits particularly gold and gemstones

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An ore deposit is an accumulation of ore This is distinct from a mineral resource as defined by the mineral resource classification criteria

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There are different phases of a mining project would house project personnel and equipment mining may commence All types of active mining share a common aspect the extraction and concentration or beneficiation of a metal from the earth Proposed mining projects differ considerably in the proposed method for extracting and

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