GOLD, STLVER, COPPER, LEAD, AND ZINC----ARIZONA. 237
resmelted,
from which were recovered 8,189,356 pounds of copper. There were also
169,008 pounds of copper recovered from tailings by leaching and the
use of scrap iron as a precipitant. The total quantity of concentrates
produced in Arizona was 248,969 tons, of which all but a small tonnage
containing lead produced in Cochise, Yavapai, Pinal, and Mohave
counties, yielded 59,859,094 pounds of copper, an average of 240.42
pounds per ton. Copper contained in concentrates was separated from
1,485,724 tons of ore, which yielded an average of 2.02 per cent of
copper. The ore was mined in the following counties: Graham, Gila,
Pinal, Cochise, Pima, and Yavapai, given in the order of importance. In
the classification of the kinds of ore produced in 1909 the copper ores
carried the bulk of the copper. Siliceous ores yielded 308,446 pounds,
of which nine-tenths was from ores mined in Cochise County; the average
content of copper was 0.06 per cent. Lead ores contained 64,785 pounds,
averaging 0.11 per cent. Copper-lead ores contained 262,154 pounds, an
average of 0.77 per cent. Copper was associated with the lead ores
produced in Cochise, Pima, and Graham counties and averaged well with
the copper-lead ores of Yavapai, Pima, and Pinal counties.
LEaD.
The
output of lead increased from 3,008,583 pounds, valued at $126,360, in
1908 to 3,098,083 pounds, valued at $133,218, in 1909, the increase
being from Pima, Yavapai, Cochise, Yuma, and Graham counties. The
largest production was in Cochise County, which yielded 2,004,018
pounds, and Yavapai County ranked next with 409,890 pounds. Crude ore
shipped to smelters contained 1,977,294 pounds, or nearly two-thirds of
the total output. Concentrates containing lead aggregated 7,661 tons
and contained 1,120,789 pounds of lead, averaging 146.29 pounds per
ton, or 7.31 per cent. The concentrates were produced in Cochise,
Yavapai, Pinal, Mohave, and Santa Cruz counties. Yavapai County was
credited with the largest total output of lead. The average recovery
was small in the county, and the average for Arizona was barely
three-tenths of a pound per ton. The mines in this county were also
productive of the laigest total yield of copper-lead ore. This county,
with Pima and Pinal counties, was credited with a total of 507,354
pounds of lead.
ZINC.
Zinc,
reported according to its yield of spelter, aggregated 5,977,237
pounds, valued at 8322,771, in 1909 as against a yield of 678,446
pounds, valued at $31,887, in 1908. In 1907 the output was 228,490
pounds. The Golconda mine, in Mohave County, produced zinc ores which
averaged nearly 50 per cent of zinc. At Tombstone, in Cochise County, a
zinc concentrate was shipped separately from the lead concentrate
produced at the mill of the Tombstone mines.
MINING INDUSTRY IN ARIZONA IN 1909.
The
figures of metal output in Arizona for 1909 suggest that the mining
industry was, in general, in a progressive condition, especially since
developments have been keeping pace with production. It is stated by
the larger companies operating copper mines at Clifton and Bisbee that
at greater depths the value and extent of ore bodies are well
maintained. The most notable feature of Arizona's copper mining was
the development of deposits of low-grade ores in porphyry
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