The term secondary crushing has become well established and familiar through long usage; it applies to the crushing stage either single or multiple which follows immediately after the primary crusher taking all or a portion of the product of the primary crushing stage as its feed The term should not be used as it sometimes is
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Get PriceGemstones are often found in secondary deposits such as the alluvial deposits which yield sapphire and ruby In the field of mineralogy they are referred to as primary deposits In primary deposits the gemstones still have their original relationship with their host rock Gemstone deposits that are carried by rivers are called
Get PriceRECYCLING METALS FOR THE ENVIRONMENT I Wernick and N J Themelis Recycling Metals for the Environment Annual Reviews Energy CONTENTS INTRODUCTION 3 METALS PRODUCTION FROM PRIMARY AND SECONDARY RESOURCES 6 Role of Thermodynamics and Kinetics 8 Ore Reserves and Economics 9 Environmental Impacts of Metal Production the gold
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Get PriceAccess our extensive collection of primary and secondary sources with a focus on California law Gold Rush; California Gold Rush Introduction The real treasures of Gold Deposits are yet to be found in the Quartz formations The prospectus states that fifty horse power steam engines had already been installed and that an ore
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Get Pricecomparable suite of secondary sulfide minerals TAG deposit in table 12 1 in the form of native gold electrum and a variety of silver Coincident with mineral changes in the supergene enrichment zone primary carbonate minerals are dissolved
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Get PriceIntroduction The California Gold Rush of the late 1840s drew thousands of people to America s west coast Traditionally historians of the gold rush have focused their attention on 1849 the year most Anglo Americans arrived from the east coast
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Get PriceINTRODUCTION TO MINING The two industries ranked together as the primary or basic industries of early civilization Little has changed in the importance of these industries since the beginning of civilization If we consider gold silver the platinum group metals and the radio active minerals uranium thorium and radium
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Get PriceThe importance of secondary enrichment of gold in lateritic regions was realized only during the gold boom of the 1980s especially in Australia The second circumstance involves mineral deposits containing sulfide minerals especially copper sulfides that are subjected to weathering under desert conditions
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Get PriceDiamond deposits are termed primary when diamonds are found in the host igneous or volcanic rocks The host rock types in which significant quantities of diamond can occur include kimberlite and more rarely orangeite and lamproite igneous rocks with similar characteristics to kimberlite
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