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the outotec biox process for the treatment of refractory gold concentrates has been in commercial operation for over 30 years with 13 successful outotec biox plants
relatively raw gold is purified in two main ways. the cheaper first stage of purification is the miller process which uses chlorine gas and reaches purification of 99.5%, and then there is the more expensive wohlwill process which electrolyses gold to purities of 99.99%.
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what is a mining engineer? everything we can't grow in the soil or fish from the sea is mined. gold, silver, nickel, platinum, iron, nuclear fuel, lithium,
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a usgs publication on the history of gold uses, gold mining, gold prospecting, assays and gold production. in the mountain building process,