Mineral Resources of the United States, 1917--Part I--Metals . pounds per man perday). Percentage of totallabor employed. Percentage of total copper produced by mines. Average produc-tion per man perday. 1916 1917 1916 1917 1916 1917 Above 300 Pounds. 200 to 300 100 to 200 120. 5 75 to 100 90 5 50 to 75 65 1 T,ess than 50 30. 1 3 The accompanying diagram (fig. 16) shows the relative amount oflabor employed in th
Mineral Resources of the United States, 1917--Part I--Metals . pounds per man perday). Percentage of totallabor employed. Percentage of total copper produced by mines. Average produc-tion per man perday. 1916 1917 1916 1917 1916 1917 Above 300 Pounds. 200 to 300 100 to 200 120. 5 75 to 100 90 5 50 to 75 65 1 T,ess than 50 30. 1 3 The accompanying diagram (fig. 16) shows the relative amount oflabor employed in the different classes of mines and the relative effi-ciency in the production of copper. 734 MINERAL RESOURCES, 1917—PART I. In the least efficient group in 1917 a total of 2,773,000 days laboryielded 83,500,000 pounds of copper; in the most efficient group1,146,000 days labor yielded 426,000,000 pounds of copper. Thereseems little question as to which of these groups should have first call 60 55 50 45 40 35uo t S 30 o (EIda25 COPPER I LABOR I 20 15 10 1 1 b. ^ Li J 1916 1917, V 300 lbs. 1917 J916 1917 J916 1917, J9I6 1917, 200-300 lbs. 100-P00 lbs 50-100 lbs. Less than 50 lbs Figure 16.—Labor employed and copper produced in different classes of copper mines, 1916 and 1917. on labor in a time of national crisis. There is likewise little questionas to which will survive in normal times. Of course, the prospect mustprecede the mine, nevertheless in war time, with ample mines to em-ploy all available labor, we are primarily interested in getting out themetal, not in developing mines for future production. COPPER. 735 SMELTER PRODUCTION. Copper produced in the United States from 18Jt5 to 1917, inclusive. [Values rounded.] Year. Quantity. Increase. Value. Year. Quantity. Increase. Value. Pounds. Pounds. Pounds. Povvds. 1845 224,000 $45,000 1883 115,526,053144,946,653 24,879,82129,420,600 $19,062,00018,843,000 1846 336,000 112,000 57,000 1S84 1847 672,000 336,000 124,000 1885
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