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Ch. 1: Gold and Silver in 1922

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Nearly all the siliceous ore in three of the largest gold-producing States—Alaska, California, and South Dakota—yields only a small quantity of silver and is classed as gold ore. The siliceous ores from Colorado include some silver and gol d-silver ores, but the great bulk of the siliceous ore is purely gold ore.
Ch. 1: Gold and Silver in 1922 Page of 54 Ch. 1: Gold and Silver in 1922
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US Geol. Surv. 1922. Gemstones, Metals.
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