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Ch. 1: Gold and Silver in 1916

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GOLD AND SILVER.                                        705
Ore produced and average extraction value of gold and silver per ton in 1916.°
a Illinois, Missouri, the Philippines, and Porto Rico not included; crude-ore tonnage containing precious metals not known. & Includes only copper ore yielding precious metals, e Included with zinc ores. d Lead and zinc ores yielded no precious metals.
Ch. 1: Gold and Silver in 1916 Page of 78 Ch. 1: Gold and Silver in 1916
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US Geol. Surv. 1916. Gemstones, Metals.
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