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Reference.org
Stamp mill
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<p>A stamp mill (or stamp battery or stamping mill) is a type of <a href="/facts/Mill_(grinding)/0PWTxI1c">mill machine</a> that crushes material by pounding rather than <a href="/facts/Mill_(grinding)/0PWTxI1c">grinding</a>, either for further processing or for extraction of metallic ores. Breaking material down is a type of <a href="/facts/Unit_operation/7TAe9XH0">unit operation</a>. </p>