Table 04. Number of HOURS
WORKED at Bituminous Coal Mines in the United States,
by Primary Activity,
1978-2007
|
Year
|
Underground
Mines
|
Surface
Mines
|
|
|
Underground
|
Surf at UG
|
Total
|
Strip
|
Auger
|
Culm Bank
|
Dredge
|
Total
|
|
1978
|
193,235,992
|
23,471,667
|
216,707,659
|
127,029,042
|
731,435
|
164,581
|
12,812
|
127,937,870
|
|
1979
|
229,776,510
|
26,448,612
|
256,225,122
|
133,785,496
|
598,590
|
182,740
|
48,066
|
134,614,892
|
|
1980
|
222,291,474
|
25,593,589
|
247,885,063
|
132,731,233
|
435,796
|
198,404
|
83,158
|
133,448,591
|
|
1981
|
200,143,701
|
23,172,963
|
223,316,664
|
128,037,354
|
397,004
|
184,400
|
126,287
|
128,745,045
|
|
1982
|
201,869,778
|
22,842,264
|
224,712,042
|
123,659,996
|
467,057
|
305,547
|
122,122
|
124,544,722
|
|
19831
|
153,945,160
|
17,050,754
|
170,995,914
|
107,904,645
|
387,067
|
158,357
|
119,209
|
108,560,278
|
|
1984
|
166,533,236
|
17,609,011
|
184,142,247
|
117,225,618
|
380,927
|
216,459
|
115,095
|
117,938,099
|
|
1985
|
160,547,476
|
16,985,892
|
177,533,368
|
107,858,791
|
482,427
|
129,303
|
98,562
|
108,569,083
|
|
1986
|
149,546,253
|
16,317,877
|
165,864,130
|
100,453,573
|
342,014
|
186,271
|
88,841
|
101,070,699
|
|
1987
|
138,492,597
|
14,179,369
|
152,671,966
|
95,864,788
|
676,046
|
254,723
|
110,455
|
96,906,012
|
|
1988
|
132,412,628
|
13,689,012
|
146,101,640
|
90,306,866
|
807,373
|
295,651
|
103,784
|
91,513,674
|
|
1989
|
128,914,189
|
13,287,809
|
142,201,998
|
88,888,078
|
694,616
|
301,646
|
145,692
|
90,030,032
|
|
1990
|
133,874,429
|
13,814,032
|
147,688,461
|
90,094,833
|
628,220
|
276,079
|
155,382
|
91,154,514
|
|
1991
|
122,070,415
|
12,545,740
|
134,616,155
|
81,928,100
|
644,767
|
258,789
|
112,277
|
82,943,933
|
|
1992
|
113,037,618
|
11,343,999
|
124,381,617
|
77,962,689
|
664,680
|
235,803
|
82,664
|
78,945,836
|
|
1993
|
94,631,858
|
9,578,174
|
104,210,032
|
71,246,947
|
602,418
|
205,919
|
49,909
|
72,105,193
|
|
1994
|
99,669,926
|
9,584,975
|
109,254,901
|
72,337,855
|
732,222
|
243,726
|
67,492
|
73,381,295
|
|
1995
|
93,800,984
|
8,527,004
|
102,327,988
|
65,857,836
|
744,622
|
197,632
|
73,945
|
66,874,035
|
|
1996
|
90,366,391
|
7,958,558
|
98,324,949
|
62,859,456
|
971,255
|
175,295
|
84,063
|
64,090,069
|
|
1997
|
88,070,192
|
7,695,736
|
95,765,928
|
62,349,269
|
1,006,837
|
195,347
|
114,785
|
63,666,238
|
|
1998
|
84,493,917
|
7,528,340
|
92,022,257
|
60,870,299
|
1,012,564
|
192,674
|
145,486
|
62,221,023
|
|
1999
|
76,863,368
|
6,759,450
|
83,622,818
|
57,045,315
|
967,434
|
154,290
|
121,905
|
58,288,944
|
|
2000
|
70,323,447
|
6,224,860
|
76,548,307
|
53,007,062
|
787,858
|
213,453
|
121,704
|
54,130,077
|
|
2001
|
74,366,243
|
6,311,783
|
80,678,026
|
59,284,835
|
857,652
|
273,706
|
141,076
|
60,557,269
|
|
2002
|
70,266,320
|
5,971,208
|
76,237,528
|
59,520,557
|
874,721
|
217,024
|
88,609
|
60,700,911
|
|
2003
|
68,630,697
|
5,541,309
|
74,172,006
|
56,246,544
|
720,531
|
242,163
|
102,255
|
57,311,493
|
|
2004
|
73,363,196
|
5,404,010
|
78,767,206
|
59,916,160
|
907,695
|
375,190
|
84,170
|
61,283,215
|
|
2005
|
80,738,151
|
5,632,863
|
86,371,014
|
64,806,518
|
1,096,766
|
469,252
|
69,462
|
66,441,998
|
|
2006
|
85,051,701
|
5,891,315
|
90,943,016
|
67,290,949
|
1,348,089
|
488,762
|
74,800
|
69,202,600
|
|
2007
|
84,334,300
|
6,052,305
|
90,386,605
|
65,502,976
|
1,265,912
|
523,874
|
54,142
|
67,346,904
|
1Beginning in 1983, only operator data are
available at this level of detail.
Table 04. Number of HOURS
WORKED at Bituminous Coal Mines in the United States,
by Primary Activity,
1978-2007 continued:
Year
|
Total
Mining
|
Indp Shops/Yrds
|
Prep
Plants
|
Total
w/o Office
|
Office
|
Grand
Total
|
|
1978
|
344,645,529
|
6,093,756
|
31,968,035
|
382,707,320
|
15,176,698
|
397,884,018
|
|
1979
|
390,840,014
|
7,528,448
|
39,127,465
|
437,495,927
|
17,418,305
|
454,914,232
|
|
1980
|
381,333,654
|
6,992,875
|
40,292,120
|
428,618,649
|
18,701,177
|
447,319,826
|
|
1981
|
352,061,709
|
5,767,038
|
39,574,890
|
397,403,637
|
18,961,303
|
416,364,940
|
|
1982
|
349,266,764
|
5,450,769
|
38,731,618
|
393,449,151
|
19,967,172
|
413,416,323
|
|
19831
|
279,556,192
|
4,535,316
|
30,554,596
|
314,646,104
|
17,790,464
|
332,436,568
|
|
1984
|
302,080,346
|
4,205,793
|
33,940,085
|
340,226,224
|
17,501,838
|
357,728,062
|
|
1985
|
286,102,451
|
3,705,027
|
32,405,332
|
322,212,810
|
16,831,993
|
339,044,803
|
|
1986
|
266,934,829
|
3,163,855
|
30,938,800
|
301,037,484
|
15,719,416
|
316,756,900
|
|
1987
|
249,577,978
|
2,548,608
|
29,550,968
|
281,677,554
|
14,635,079
|
296,312,633
|
|
1988
|
237,615,314
|
2,094,633
|
29,533,043
|
269,242,990
|
14,086,263
|
283,329,253
|
|
1989
|
232,232,030
|
1,806,627
|
29,412,739
|
263,451,396
|
13,861,911
|
277,313,307
|
|
1990
|
238,842,975
|
2,094,060
|
29,642,734
|
270,579,769
|
13,343,412
|
283,923,181
|
|
1991
|
217,560,088
|
2,060,562
|
27,561,982
|
247,182,632
|
12,407,931
|
259,590,563
|
|
1992
|
203,327,453
|
1,863,873
|
26,022,684
|
231,214,010
|
11,872,397
|
243,086,407
|
|
1993
|
176,315,225
|
1,579,713
|
22,740,240
|
200,635,178
|
11,021,443
|
211,656,621
|
|
1994
|
182,636,196
|
1,564,874
|
23,701,076
|
207,902,146
|
10,971,235
|
218,873,381
|
|
1995
|
169,202,023
|
1,271,805
|
21,776,088
|
192,249,916
|
10,121,743
|
202,371,659
|
|
1996
|
162,415,018
|
1,016,098
|
21,129,492
|
184,560,608
|
9,266,311
|
193,826,919
|
|
1997
|
159,432,166
|
916,011
|
20,238,697
|
180,586,874
|
8,746,897
|
189,333,771
|
|
1998
|
154,243,280
|
936,650
|
19,133,277
|
174,313,207
|
7,860,320
|
182,173,527
|
|
1999
|
141,911,762
|
932,378
|
17,433,532
|
160,277,672
|
6,942,610
|
167,220,282
|
|
2000
|
130,678,384
|
1,098,122
|
16,450,673
|
148,227,179
|
6,285,584
|
154,512,763
|
|
2001
|
141,235,295
|
1,072,686
|
17,330,790
|
159,638,771
|
6,523,645
|
166,162,416
|
|
2002
|
136,938,439
|
941,056
|
17,384,343
|
155,263,838
|
6,456,568
|
161,720,406
|
|
2003
|
131,483,499
|
922,669
|
16,607,646
|
149,013,814
|
6,024,906
|
155,038,720
|
|
2004
|
140,050,421
|
945,335
|
17,257,924
|
158,253,680
|
6,180,949
|
164,434,629
|
|
2005
|
152,813,012
|
981,410
|
18,666,962
|
172,461,384
|
6,782,096
|
179,243,480
|
|
2006
|
160,145,616
|
978,262
|
18,953,581
|
180,077,459
|
6,905,109
|
186,982,568
|
|
2007
|
157,733,509
|
988,900
|
18,565,671
|
177,288,080
|
7,088,668
|
184,376,748
|
1Beginning in 1983, only operator data are
available at this level of detail.
|
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