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Ch. 1: Gold and Silver in 1918

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MINERAL RESOURCES, 1918—PART I.
spective of their precious-metal content; but ores of lower grades in lead and especially in zinc are treated profitably in many districts, and of course they are then classified as lead or zinc ores, as the case may be. The mixed ores are combinations of those enumerated.
The lead, zinc, and lead-zinc ores in many districts in the Eastern and Central States carry no appreciable quantity of gold or silver, and such ores are excluded from this report.
Ore produced and average extraction value of gold and silver per ton in 1918.a
Ch. 1: Gold and Silver in 1918 Page of 73 Ch. 1: Gold and Silver in 1918
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US Geol. Surv. 1918. Gemstones, Metals.
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