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Arrastra - Wikipedia

An Arrastra (or Arastra) is a primitive mill for grinding and pulverizing (typically) gold or silver ... With a horse, mule or human providing power at the other end of the arm, the stones ... Surface · Underground in hard rock · Underground in soft rock ... History of mining · History of metallurgy · Mining equipment · Grinding mills...Read More

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What is an Arrastra (aka Arastra, Rastra, Mexican Rastra, Chili Mill)?

The usual equipment is a stamp mill--I have found four of these in my travels. ... Any book on mining or gold rush history will have information on stamp mills. ... more large stones; and these being drawn around by donkey or mule-power, grind ... large stone wheel, attached to the horizontal shaft, is used for grinding the rock.Read More

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Gold extraction - Wikipedia

Gold extraction refers to the processes required to extract gold from its ores. This may require a ... Hard rock ores have formed the basis of the majority of commercial gold ... High grade ores and ores resistant to cyanide leaching at coarse particle ... The processing techniques can include grinding, concentration, roasting,...Read More

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