TABLE 10. - Man-hours worked, by general work location, at all coal mines in the
United States, 1931-77
Underground mines Total
Year underground
Underground Surface mining
1931 748,942,825 121,404,445 870,347,270
1932 586,132,753 100,475,824 686,608,577
1933 663,298,411 114,602,148 777,900,559
1934 716,843,966 122,331,583 839,175,549
1935 686,631,907 113,559,153 800,191,060
1936 775,208,054 128,135,195 903,343,249
1937 767,651,412 120,743,894 888,395,306
1938 578,325,001 95,883,400 674,208,401
1939 631,174,468 104,581,660 735,756,128
1940 698,853,920 112,722,489 811,576,409
1941 759,404,938 125,420,024 884,824,962
1942 831,601,025 146,940,808 978,541,833
1943 821,831,745 160,434,661 982,266,406
1944 826,700,609 180,371,287 1,007,071,896
1945 723,548,050 163,758,454 887,306,504
1946 656,739,055 149,916,061 806,655,116
1947 712,134,852 156,591,912 868,726,764
1948 663,834,124 149,760,155 813,594,279
1949 470,728,130 108,192,444 578,920,574
1950 519,090,175 119,720,506 638,810,681
1951 511,978,524 118,238,100 630,216,624
1952 431,309,203 101,052,670 532,361,873
1953 369,242,524 88,859,506 458,102,030
1954 270,848,931 70,109,257 340,958,188
1955 294,013,251 73,949,395 367,962,646
1956 299,085,138 76,130,615 375,215,753
1957 280,614,185 66,246,064 346,860,249
1958 213,175,261 52,609,078 265,784,339
1959 192,630,346 49,399,560 242,029,906
1960 181,715,004 46,557,852 228,272,856
1961 163,106,195 42,508,874 205,615,069
1962 157,333,200 41,102,251 198,435,451
1963 159,240,677 41,181,521 200,422,198
1964 161,043,446 39,415,369 200,458,815
1965 159,465,278 38,221,602 197,686,880
1966 154,002,624 25,708,895 179,711,519
1967 153,436,875 23,496,419 176,933,294
1968 148,593,131 21,052,283 169,645,414
1969 151,985,482 19,402,828 171,388,310
1970 164,576,129 19,460,060 184,036,189
1971 153,801,537 19,192,511 172,994,048
1972 170,495,460 17,056,901 187,552,361
1973 171,782,448 16,849,790 188,632,238
1974 173,409,396 17,973,527 191,382,923
1975 210,474,994 23,498,699 233,973,693
1976 217,941,158 23,933,537 241,874,695
1977 206,289,834 24,245,599 230,535,433
NA Not available.
Total
Year Strip Auger Culm Dredges surface Total
banks mining mining
1931 12,937,803 NA NA NA 12,937,803 883,285,073
1932 12,515,960 NA NA NA 12,515,960 699,124,537
1933 14,947,004 NA NA NA 14,947,004 792,847,563
1934 16,311,413 NA NA NA 16,311,413 855,486,962
1935 18,952,430 NA NA NA 18,952,430 819,143,490
1936 22,637,174 NA NA 324,430 22,961,604 926,304,853
1937 23,503,493 NA NA 536,068 24,039,561 912,434,867
1938 21,025,425 NA NA 365,941 21,391,366 695,599,767
1939 23,868,726 NA NA 414,564 24,283,290 760,039,418
1940 28,232,634 NA NA 607,720 28,840,354 840,416,763
1941 35,879,513 NA NA 831,447 36,710,960 921,535,922
1942 41,609,413 NA NA 927,114 42,536,527 1,021,078,360
1943 48,438,060 NA 2,876,119 960,431 52,274,610 1,034,541,016
1944 65,631,763 NA 4,689,976 1,080,742 71,402,481 1,078,474,377
1945 67,688,593 NA 2,733,078 862,992 71,284,663 958,591,167
1946 68,945,107 NA 3,131,884 896,087 72,973,078 879,628,194
1947 77,334,619 NA 2,475,347 1,002,968 80,812,934 949,539,698
1948 81,531,176 NA 2,222,329 882,937 84,636,442 898,230,721
1949 61,450,815 NA 1,363,162 741,197 63,555,174 642,475,748
1950 71,017,995 NA 1,213,308 347,573 72,578,876 711,389,557
1951 65,935,063 NA 779,532 316,174 67,030,769 697,247,393
1952 60,408,049 NA 607,513 320,875 61,336,437 593,698,310
1953 54,405,852 NA 836,046 249,610 55,491,508 513,593,538
1954 46,263,087 NA 539,309 189,631 46,992,027 387,950,215
1955 49,262,500 1,502,084 437,277 214,108 51,415,969 419,378,615
1956 54,221,469 2,685,664 1,253,678 285,279 58,446,090 433,661,843
1957 52,050,907 2,358,783 1,204,586 235,568 55,849,844 402,710,093
1958 48,197,748 2,044,676 801,573 251,890 51,295,887 317,080,226
1959 46,556,136 1,933,575 680,824 252,311 49,422,846 291,452,752
1960 46,011,766 2,164,178 651,652 217,417 49,045,013 277,317,869
1961 43,038,045 1,879,406 568,152 247,606 45,733,209 251,348,278
1962 43,705,401 2,318,852 494,578 230,906 46,749,737 245,185,188
1963 45,318,532 2,798,202 527,159 208,776 48,852,669 249,274,867
1964 45,099,919 2,460,342 552,552 216,377 48,329,190 248,788,005
1965 45,105,063 2,379,825 485,904 192,575 48,163,367 245,850,247
1966 41,717,308 2,879,369 497,564 170,421 45,264,662 224,976,181
1967 42,311,617 2,735,248 615,846 147,314 45,810,025 222,743,319
1968 42,250,581 3,003,954 621,598 143,653 46,019,786 215,665,200
1969 44,282,952 3,050,098 591,488 143,323 48,067,861 219,456,171
1970 52,426,239 3,690,955 680,998 147,409 56,945,601 240,981,790
1971 58,940,951 3,776,796 616,034 84,449 63,418,230 236,412,278
1972 52,533,095 1,945,157 309,696 45,774 54,833,722 242,386,083
1973 57,683,377 1,732,973 310,376 56,825 59,783,551 248,415,789
1974 73,008,212 1,884,108 284,440 9,513 75,186,273 266,569,196
1975 96,634,243 1,453,643 424,772 45,921 98,558,579 332,532,272
1976 103,324,421 1,147,389 508,686 12,085 104,992,581 346,867,276
1977 118,762,983 1,122,651 413,230 16,179 120,315,043 350,850,476
NA Not available.
Independent Mechanical
Year shops and cleaning Grand
yards plants total
1931 NA NA 883,285,073
1932 NA NA 699,124,537
1933 NA NA 792,847,563
1934 NA NA 855,486,962
1935 NA NA 819,143,490
1936 NA NA 926,304,853
1937 NA NA 912,434,867
1938 NA NA 695,599,767
1939 NA NA 760,039,418
1940 NA NA 840,416,763
1941 NA NA 921,535,922
1942 NA NA 1,021,078,360
1943 NA NA 1,034,541,016
1944 NA NA 1,078,474,377
1945 NA NA 958,591,167
1946 NA NA 879,628,194
1947 NA NA 949,539,698
1948 NA NA 898,230,721
1949 NA NA 642,475,748
1950 NA NA 711,389,557
1951 NA NA 697,247,393
1952 NA NA 593,698,310
1953 NA NA 513,593,538
1954 NA NA 387,950,215
1955 NA NA 419,378,615
1956 NA NA 433,661,843
1957 NA 5,497,087 408,207,180
1958 NA 5,148,589 322,228,815
1959 NA 4,578,486 296,031,238
1960 NA 4,209,958 281,527,827
1961 NA 3,947,324 255,295,602
1962 NA 3,761,187 248,946,375
1963 NA 3,909,641 253,184,508
1964 NA 3,616,545 252,404,550
1965 NA 3,138,132 248,988,379
1966 NA 18,782,824 243,759,005
1967 NA 19,031,115 241,774,434
1968 NA 18,751,720 234,416,920
1969 NA 18,027,767 237,483,938
1970 NA 19,187,416 260,169,206
1971 NA 17,722,746 254,135,024
1972 3,403,518 21,760,224 267,549,825
1973 5,411,116 23,794,623 277,621,528
1974 5,550,881 24,655,350 296,775,427
1975 6,533,342 29,130,973 368,196,587
1976 6,865,878 29,424,686 383,157,840
1977 6,785,964 32,983,526 390,619,966
NA Not available.
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