Ch. 1: Gold and Silver in 1919

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	698 MINERAL RESOURCES, 1919—PART I.

	DISTRIBUTION OF MINE PRODUCTION OF SILVER IN 1919, BY SOURCES. Mine production of silver in 1919, in fine ounces.¹¹



	The mine production of silver from the three most important sources of silver, dry or siliceous ores, copper ores, and lead ores was 89.16 per cent of the total output in 1919 against 88.6 per cent of the total output in 1918. The percentage of the total output from dry and siliceous ores increased 5.01 per cent in 1919, following an increase of 1.27 per cent in 1918; that from lead ores increased 0.76 per cent in 1919; that from lead-zinc ores decreased 0.54 per cent and that from copper ores 5.25 per cent. The combined yield of silver from placers, zinc ores, and copper-lead ores was only 0.68 per cent of the total. PLACERS.

	The output of silver from the refining of placer gold was 78,401 fine ounces in 1919, against 89,494 fine ounces in 1918, and 118,604 ounces in 1917. Of the total production 78 per cent came from Alaska and California. DRY AND SILICEOUS ORES. The mine production of silver from dry and siliceous ores in 1919 was 19,043,515 fine ounces, against 21,564,982 fine ounces in 1918. About 33 per cent of this was from Nevada (chiefly from the Tono-pah district) and 22.2 per cent was from Colorado (mainly from the

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