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Leading mining historian Kerby Jackson brings together five historic publications from the Arizona Bureau of Mines on the subject of sampling and testing for gold, be it placer or lode gold. Included in this publication are "Mill and Smelter Methods of Sampling" (1915), "Sampling and the Estimation of Gold in a Placer Deposit" (1917), "Sampling of Ore Dumps and Tailings" (1917), "Sampling Mineralized Veins" (1918) and "Select Blowpipe and Acid Tests for Minerals" (1918). As sampling is the ...