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Hard Rocks That Contain Gold

Gold in igneous rocks -----1 Gold in sedimentary rocks-----3 ... Igneous rocks contain as little as 0.2 and as much as 73 ppb parts per billion gold. The average, calculated on the basis of 50 percent granite and 50 percent basalt, is 3.0 ppb. Averages in parts per billion for individual plutonic rock

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