TABLE 10B. - Man-hours, by general work location, at bituminous mines
in the United States, 1931-77
Underground mines Total
Year underground
Underground Surface mines
1931 589,257,418 76,512,456 665,769,874
1932 466,914,899 66,412,880 533,327,779
1933 547,825,683 81,012,012 628,837,695
1934 582,493,398 85,274,568 667,767,966
1935 571,877,405 81,726,086 653,603,491
1936 659,651,911 95,033,145 754,685,056
1937 666,083,451 92,969,503 759,052,954
1938 491,776,427 71,661,952 563,438,379
1939 539,808,782 78,337,437 618,146,219
1940 608,341,495 87,500,068 695,841,563
1941 663,615,116 98,101,373 761,716,489
1942 732,161,751 116,368,785 848,530,536
1943 716,572,814 126,429,168 843,001,982
1944 719,457,567 140,317,699 859,775,266
1945 631,295,355 127,571,775 758,867,130
1946 557,241,688 112,579,199 669,820,887
1947 614,710,221 121,861,355 736,571,576
1948 563,268,925 114,409,403 677,678,328
1949 398,295,255 82,063,558 480,358,813
1950 442,339,238 92,719,057 535,058,295
1951 443,311,604 91,919,348 535,230,952
1952 370,370,004 77,577,247 447,947,251
1953 327,796,823 70,270,114 398,066,937
1954 241,975,814 55,550,372 297,526,186
1955 267,060,347 61,747,193 328,807,540
1956 271,412,129 62,543,534 333,955,663
1957 256,698,850 59,482,636 316,181,486
1958 195,439,958 47,150,086 242,590,044
1959 178,671,053 44,833,005 223,504,058
1960 170,859,073 42,808,275 213,667,348
1961 153,838,760 38,808,078 192,646,838
1962 148,871,378 37,811,779 186,683,157
1963 150,815,086 38,027,261 188,842,347
1964 152,751,716 36,501,134 189,252,850
1965 153,021,285 35,731,720 188,753,005
1966 149,452,245 23,544,419 172,996,664
1967 149,881,259 21,635,323 171,516,582
1968 145,926,919 19,628,536 165,555,455
1969 149,681,005 18,440,872 168,121,877
1970 162,406,909 18,676,034 181,082,943
1971 152,237,035 18,677,741 170,914,776
1972 169,723,048 16,839,961 186,563,009
1973 171,029,899 16,662,926 187,692,825
1974 172,876,081 17,859,676 190,735,757
1975 209,808,919 23,385,926 233,194,845
1976 217,251,697 23,815,467 241,067,164
1977 205,726,540 24,143,419 229,869,959
NA Not available.
Total
Year Strip Auger Culm Dredges surface Total
banks mining mining
1931 9,100,630 NA NA NA 9,100,630 674,870,504
1932 8,852,759 NA NA NA 8,852,759 542,180,538
1933 9,286,475 NA NA NA 9,286,475 638,124,170
1934 9,346,915 NA NA NA 9,346,915 677,114,881
1935 11,443,618 NA NA NA 11,443,618 665,047,109
1936 15,133,873 NA NA - 15,133,873 769,818,929
1937 17,527,962 NA NA - 17,527,962 776,580,916
1938 16,309,101 NA NA - 16,309,101 579,747,480
1939 18,681,956 NA NA - 18,681,956 636,828,175
1940 22,127,885 NA NA - 22,127,885 717,969,448
1941 29,712,028 NA NA - 29,712,028 791,428,517
1942 34,987,830 NA NA - 34,987,830 883,518,366
1943 40,707,026 NA - - 40,707,026 883,709,008
1944 55,150,024 NA - - 55,150,024 914,925,290
1945 58,449,068 NA - - 58,449,068 817,316,198
1946 58,174,057 NA - - 58,174,057 727,994,944
1947 66,444,762 NA - - 66,444,762 803,016,338
1948 70,007,405 NA - - 70,007,405 747,685,733
1949 52,806,709 NA - - 52,806,709 533,165,522
1950 59,777,580 NA - - 59,777,580 594,835,875
1951 55,175,441 NA - - 55,175,441 590,406,393
1952 49,966,814 NA - - 49,966,814 497,914,065
1953 46,251,902 NA - - 46,251,902 444,318,839
1954 40,201,033 NA - - 40,201,033 337,727,219
1955 43,074,229 1,502,084 - - 44,576,313 373,383,853
1956 46,800,890 2,685,664 - - 49,486,554 383,442,217
1957 45,355,642 2,358,783 - - 47,714,425 363,895,911
1958 42,123,086 2,044,676 - - 44,167,762 286,757,806
1959 41,222,298 1,933,575 - - 43,155,873 266,659,931
1960 41,243,919 2,164,178 - - 43,408,097 257,075,445
1961 38,345,073 1,879,406 - - 40,224,479 232,871,317
1962 39,264,604 2,318,852 - - 41,583,456 228,266,613
1963 40,495,726 2,798,202 - - 43,293,928 232,136,275
1964 40,323,661 2,460,342 - - 42,784,003 232,036,853
1965 41,480,190 2,379,825 - - 43,860,015 232,613,020
1966 38,384,042 2,879,369 - - 41,263,411 214,260,075
1967 39,132,387 2,735,248 - - 41,867,635 213,384,217
1968 38,988,793 3,003,954 - - 41,992,747 207,548,202
1969 40,963,633 3,050,098 - - 44,013,731 212,135,608
1970 48,816,087 3,690,955 - - 52,507,042 233,589,985
1971 55,324,453 3,776,796 - - 59,101,249 230,016,025
1972 49,892,914 1,945,157 7,764 - 51,845,835 238,408,844
1973 55,396,261 1,732,973 - 9,156 57,138,390 244,831,215
1974 70,957,562 1,884,108 15,873 9,019 72,866,562 263,602,319
1975 94,611,096 1,453,643 174,192 41,116 96,280,047 329,474,892
1976 101,203,129 1,147,389 205,049 - 102,555,567 343,622,731
1977 116,567,940 1,122,651 197,905 - 117,888,496 347,758,455
NA Not available.
Independent Mechanical
Year shops and cleaning Grand
yards plants total
1931 NA NA 674,870,504
1932 NA NA 542,180,538
1933 NA NA 638,124,170
1934 NA NA 677,114,881
1935 NA NA 665,047,109
1936 NA NA 769,818,929
1937 NA NA 776,580,916
1938 NA NA 579,747,480
1939 NA NA 636,828,175
1940 NA NA 717,969,448
1941 NA NA 791,428,517
1942 NA NA 883,518,366
1943 NA NA 883,709,008
1944 NA NA 914,925,290
1945 NA NA 817,316,198
1946 NA NA 727,994,944
1947 NA NA 803,016,338
1948 NA NA 747,685,733
1949 NA NA 533,165,522
1950 NA NA 594,835,875
1951 NA NA 590,406,393
1952 NA NA 497,914,065
1953 NA NA 444,318,839
1954 NA NA 337,727,219
1955 NA NA 373,383,853
1956 NA NA 383,442,217
1957 NA NA 363,895,911
1958 NA NA 286,757,806
1959 NA NA 266,659,931
1960 NA NA 257,075,445
1961 NA NA 232,871,317
1962 NA NA 228,266,613
1963 NA NA 232,136,275
1964 NA NA 232,036,853
1965 NA NA 232,613,020
1966 NA 15,827,064 230,087,139
1967 NA 16,030,924 229,415,141
1968 NA 15,857,479 223,405,681
1969 NA 15,275,800 227,411,408
1970 NA 16,355,411 249,945,396
1971 NA 14,803,806 244,819,831
1972 3,325,592 19,603,772 261,338,208
1973 5,118,858 21,625,415 271,575,488
1974 5,349,888 22,719,830 291,672,037
1975 6,375,549 27,399,552 363,249,993
1976 6,711,797 27,650,596 377,985,124
1977 6,642,312 31,032,738 385,433,505
NA Not available.
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