n Illinois, Kentucky, Missouri, Philippines, and Porto Rico not included in this tabic. i> Includes only copper ore yielding precious metals. <■■ 15 ounces in 20,944 tons.
The
total quantity of ore treated or sold in 1910 and producing gold and
silver was 31,717,912 short tons, against 30,564,557 short tons in
1909. The total output of dry or siliceous ores decreased from
9,755,650 short tons, or 31.92 per cent of the total, in 1909, to
9,646,294 short tons, or 30.41 per cent of the total, in 1910. The
average precious metal value per ton, however, increased from $7.65 in
1909 to $8.07 in 1910. The quantity of copper ores increased from
18,152,224 tons,
