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about ore mining in olden days description

In the flatlands massive dredgers processed gravels from ancient riverbeds evidence of this kind of mining can still be found for example in and around Folsom where miles of dredger rockpiles still exist Ore crushing went well beyond the simple arrastre with the proliferation of stamp mills large and small...As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.

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