Table 04. Number of HOURS WORKED
at Coal Mines in the United
States, by Primary Activity, 1978-2007
|
|
Underground
Mines
|
Surface
Mines
|
|
Year
|
Underground
|
Surf
at UG
|
Total
|
Strip
|
Auger
|
Culm
Bank
|
Dredge
|
Total
|
|
1978
|
193,794,718
|
23,569,960
|
217,364,678
|
128,683,555
|
731,435
|
378,060
|
23,922
|
129,816,972
|
|
1979
|
230,304,102
|
26,522,638
|
256,826,740
|
135,510,409
|
598,590
|
438,467
|
57,738
|
136,605,504
|
|
1980
|
222,870,843
|
25,675,431
|
248,546,274
|
135,138,201
|
435,796
|
444,437
|
93,698
|
136,112,132
|
|
1981
|
200,772,943
|
23,277,349
|
224,050,292
|
130,576,920
|
397,004
|
415,581
|
139,598
|
131,529,103
|
|
1982
|
202,557,495
|
22,954,235
|
225,511,730
|
126,125,400
|
467,057
|
541,853
|
138,659
|
127,272,969
|
|
1983
|
155,494,125
|
18,744,636
|
174,238,761
|
115,456,732
|
570,423
|
442,954
|
156,531
|
116,626,640
|
|
1984
|
168,158,329
|
19,445,063
|
187,603,392
|
126,303,153
|
549,037
|
488,186
|
158,823
|
127,499,199
|
|
1985
|
162,461,265
|
19,576,115
|
182,036,880
|
116,870,526
|
648,976
|
469,398
|
126,150
|
118,115,050
|
|
1986
|
151,166,953
|
19,034,396
|
170,201,349
|
109,267,927
|
608,980
|
589,878
|
112,868
|
110,579,653
|
|
1987
|
139,667,922
|
16,649,387
|
156,317,309
|
105,119,295
|
878,387
|
654,963
|
150,384
|
106,803,029
|
|
1988
|
133,721,086
|
16,060,832
|
149,781,918
|
100,834,103
|
969,369
|
588,348
|
170,408
|
102,562,228
|
|
1989
|
130,635,823
|
16,473,421
|
147,109,244
|
100,595,934
|
875,864
|
675,184
|
199,502
|
102,346,484
|
|
1990
|
136,021,939
|
17,325,525
|
153,347,464
|
102,862,419
|
836,174
|
791,649
|
192,039
|
104,682,281
|
|
1991
|
124,435,749
|
16,546,316
|
140,982,065
|
94,544,458
|
882,922
|
755,464
|
141,238
|
96,324,082
|
|
1992
|
116,013,668
|
16,251,448
|
132,265,116
|
92,377,668
|
799,054
|
857,272
|
114,879
|
94,148,873
|
|
1993
|
97,713,848
|
15,473,757
|
113,187,605
|
86,027,291
|
862,951
|
1,064,394
|
72,118
|
88,026,754
|
|
1994
|
102,556,106
|
15,206,980
|
117,763,086
|
87,518,041
|
936,203
|
929,062
|
97,912
|
89,481,218
|
|
1995
|
96,348,584
|
14,004,507
|
110,353,091
|
80,293,088
|
922,842
|
924,278
|
110,028
|
82,250,236
|
|
1996
|
93,530,286
|
13,833,572
|
107,363,858
|
78,168,209
|
1,162,645
|
891,821
|
174,130
|
80,396,805
|
|
1997
|
91,949,818
|
13,802,276
|
105,752,094
|
79,634,049
|
1,253,071
|
925,869
|
145,678
|
81,958,667
|
|
1998
|
88,231,397
|
12,925,813
|
101,157,210
|
78,434,109
|
1,175,045
|
862,405
|
384,511
|
80,856,070
|
|
1999
|
80,634,251
|
11,649,426
|
92,283,677
|
74,383,657
|
1,162,466
|
636,802
|
163,573
|
76,346,498
|
|
2000
|
74,680,266
|
11,480,214
|
86,160,480
|
69,984,140
|
986,363
|
724,170
|
191,496
|
71,886,169
|
|
2001
|
79,876,376
|
11,583,586
|
91,459,962
|
77,412,311
|
1,196,400
|
701,888
|
200,828
|
79,511,427
|
|
2002
|
74,657,800
|
11,046,101
|
85,703,901
|
75,353,030
|
1,178,053
|
629,537
|
115,243
|
77,275,863
|
|
2003
|
72,544,051
|
10,439,060
|
82,983,111
|
71,751,200
|
923,250
|
656,208
|
159,600
|
73,490,258
|
|
2004
|
78,180,620
|
10,845,491
|
89,026,111
|
77,530,926
|
1,094,013
|
888,705
|
109,267
|
79,622,911
|
|
2005
|
86,535,496
|
11,711,676
|
98,247,172
|
83,608,106
|
1,351,896
|
1,117,449
|
126,243
|
86,203,694
|
|
2006
|
91,000,929
|
12,609,265
|
103,610,194
|
87,551,261
|
1,472,123
|
1,155,870
|
98,284
|
90,277,538
|
|
2007
|
90,618,088
|
12,477,836
|
103,095,924
|
85,852,684
|
1,324,153
|
1,316,372
|
112,683
|
88,605,892
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Table 04. Number of HOURS WORKED
at 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
|
347,181,650
|
6,193,667
|
33,410,981
|
386,786,298
|
15,353,676
|
402,139,974
|
|
1979
|
393,432,444
|
7,596,878
|
40,733,250
|
441,762,372
|
17,602,290
|
459,364,662
|
|
1980
|
384,658,406
|
7,125,512
|
42,256,815
|
434,040,733
|
18,885,019
|
452,925,752
|
|
1981
|
355,579,395
|
5,913,029
|
41,516,747
|
403,009,171
|
19,156,127
|
422,165,298
|
|
1982
|
352,784,699
|
5,548,130
|
40,605,536
|
398,938,365
|
20,176,412
|
419,114,777
|
|
1983
|
290,865,401
|
5,119,037
|
34,944,666
|
330,929,104
|
19,035,543
|
349,964,647
|
|
1984
|
315,102,591
|
4,882,467
|
38,000,431
|
357,985,489
|
18,653,649
|
376,639,138
|
|
1985
|
300,152,430
|
3,801,682
|
37,377,939
|
341,332,051
|
17,866,726
|
359,198,777
|
|
1986
|
280,781,002
|
3,267,174
|
35,506,051
|
319,554,227
|
16,753,243
|
336,307,470
|
|
1987
|
263,120,338
|
2,628,954
|
33,778,861
|
299,528,153
|
15,671,298
|
315,199,451
|
|
1988
|
252,344,146
|
2,176,951
|
33,448,509
|
287,969,606
|
15,594,848
|
303,564,454
|
|
1989
|
249,455,728
|
1,880,450
|
34,680,089
|
286,016,267
|
16,064,992
|
302,081,259
|
|
1990
|
258,029,745
|
2,173,931
|
35,558,200
|
295,761,876
|
15,158,441
|
310,920,317
|
|
1991
|
237,306,147
|
2,134,856
|
34,208,799
|
273,649,802
|
14,490,454
|
288,140,256
|
|
1992
|
226,413,989
|
1,980,216
|
32,769,984
|
261,164,189
|
14,755,195
|
275,919,384
|
|
1993
|
201,214,359
|
1,698,221
|
29,300,457
|
232,213,037
|
14,074,802
|
246,287,839
|
|
1994
|
207,244,304
|
1,636,126
|
31,590,791
|
240,471,221
|
13,790,888
|
254,262,109
|
|
1995
|
192,603,327
|
1,445,750
|
28,905,698
|
222,954,775
|
13,200,912
|
236,155,687
|
|
1996
|
187,760,663
|
1,161,384
|
28,521,022
|
217,443,069
|
12,166,183
|
229,609,252
|
|
1997
|
187,710,761
|
939,553
|
27,697,722
|
216,348,036
|
12,231,636
|
228,579,672
|
|
1998
|
182,013,280
|
1,039,878
|
27,352,002
|
210,405,160
|
11,416,567
|
221,821,727
|
|
1999
|
168,630,175
|
1,033,745
|
25,601,705
|
195,265,625
|
10,458,072
|
205,723,697
|
|
2000
|
158,046,649
|
1,157,000
|
24,348,076
|
183,551,725
|
9,954,694
|
193,506,419
|
|
2001
|
170,971,389
|
1,116,804
|
26,294,219
|
198,382,412
|
10,390,496
|
208,772,908
|
|
2002
|
162,979,764
|
1,169,075
|
26,643,102
|
190,791,941
|
9,575,966
|
200,367,907
|
|
2003
|
156,473,369
|
1,146,588
|
25,427,265
|
183,047,222
|
9,036,782
|
192,084,004
|
|
2004
|
168,649,022
|
1,400,329
|
26,017,595
|
196,066,946
|
8,930,315
|
204,997,261
|
|
2005
|
184,450,866
|
1,649,101
|
28,539,629
|
214,639,596
|
9,681,799
|
224,321,395
|
|
2006
|
193,887,732
|
1,626,953
|
30,453,014
|
225,967,699
|
9,178,375
|
235,146,074
|
|
2007
|
191,701,816
|
1,618,756
|
28,762,239
|
222,082,811
|
9,929,407
|
232,012,218
|
All numbers include contractors.
|
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