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R M Portable Gold Mining Mill 1

R M Portable Gold Mining Mill 1

the placer mining was done before 1900 by small-scale methods utilizing portable equipment, such as rockers, sluices, and drywashers, to work small deposits; most of the placer gold produced in the State since 1900 was mined by a few very large dredge operations between 1920 and 1959. INTRODUCTION

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