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Ch. 1: Gold and Silver in 1903

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176                                    MINERAL RESOURCES.
For reasbns previously stated these averages may be considered as exclusive of the sulphuret values. The first five counties named are the mother-lode counties, where the veins are large and the ores generally of low grade. It may be noted that among these the county with the largest tonnage has the lowest average value, and the county with the smallest tonnage has the highest average value. In the case of Calaveras County, one very extensively operated mine, with very low grade ore, has brought the average value below what may be considered the normal. Both Kern and Nevada counties make excellent showings, both in tonnage and in average value. In Shasta and Siskiyou counties the ores worked are of high grade, but the gross quantities are comparatively small.
It should be satisfactory to the mining community of California to know that the figures collected by the United States Geological Survey show that the State increased its total output of gold, silver, lead, copper, and platinum in 1904 over that of 1903 by $3,929,124, or at the rate of $327,427 per month for the year under review. An abstract comparative statement is as follows:
Comparative production of gold, silver, copper, lead, and platinum in California in 190$
and 1904-
From the tables given in this chapter it may readily be seen which of the counties of the State are the best for quartz mining and which for gravel mining, and it may also be seen which counties make the largest annual yield from the different forms of gravel mining, hydraulic, drift, dredging, and surface placer. Nevada produces more gold from quartz than any other county, Trinity more from hydraulic mines, Placer more from drift, Butte more from dredging, and Siskiyou more from surface placers.
In quartz mining the leading counties in their order of productive rank have already been noted both in text and in tables, and the same has been done for the different forms of gravel mining considered separately. As to rank, where all forms of gravel or placer mining combined are considered, Butte takes the lead, and is the only one showing over $1,000,000 yield from such sources; indeed, the amount
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US Geol. Surv. 1904. Gemstones, Metals.
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