Table 04. Number of
HOURS WORKED at Anthracite 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
|
558,726
|
98,293
|
657,019
|
1,654,513
|
-
|
213,479
|
11,110
|
1,879,102
|
|
1979
|
527,592
|
74,026
|
601,618
|
1,725,213
|
-
|
255,727
|
9,672
|
1,990,612
|
|
1980
|
579,369
|
81,842
|
661,211
|
2,406,968
|
-
|
246,033
|
10,540
|
2,663,541
|
|
1981
|
629,242
|
104,386
|
733,628
|
2,539,566
|
-
|
231,181
|
13,311
|
2,784,058
|
|
1982
|
687,717
|
111,971
|
799,688
|
2,465,404
|
-
|
236,306
|
16,537
|
2,718,247
|
|
19831
|
563,168
|
100,113
|
663,281
|
1,808,340
|
-
|
233,166
|
17,068
|
2,058,574
|
|
1984
|
604,214
|
119,145
|
723,359
|
1,775,315
|
-
|
240,431
|
18,357
|
2,034,103
|
|
1985
|
586,909
|
126,599
|
713,508
|
1,505,021
|
-
|
259,912
|
12,879
|
1,777,812
|
|
1986
|
661,682
|
156,109
|
817,791
|
1,694,776
|
-
|
332,931
|
13,326
|
2,041,033
|
|
1987
|
515,001
|
157,666
|
672,667
|
1,156,455
|
-
|
318,529
|
6,538
|
1,481,522
|
|
1988
|
482,136
|
161,204
|
643,340
|
1,060,923
|
-
|
237,948
|
4,357
|
1,303,228
|
|
1989
|
442,919
|
139,985
|
582,904
|
1,172,247
|
-
|
250,117
|
5,615
|
1,427,979
|
|
1990
|
394,939
|
123,144
|
518,083
|
1,318,132
|
-
|
387,092
|
3,135
|
1,708,359
|
|
1991
|
354,168
|
108,207
|
462,375
|
1,174,713
|
-
|
389,374
|
5,200
|
1,569,287
|
|
1992
|
336,142
|
116,282
|
452,424
|
1,154,779
|
-
|
491,207
|
4,378
|
1,650,364
|
|
1993
|
294,225
|
96,603
|
390,828
|
949,750
|
-
|
658,822
|
4,838
|
1,613,410
|
|
1994
|
271,744
|
83,030
|
354,774
|
1,002,527
|
-
|
505,007
|
6,340
|
1,513,874
|
|
1995
|
291,758
|
90,431
|
322,189
|
965,144
|
-
|
548,490
|
4,340
|
1,517,974
|
|
1996
|
281,344
|
73,351
|
354,695
|
1,045,895
|
-
|
548,079
|
2,690
|
1,596,664
|
|
1997
|
261,742
|
87,096
|
348,838
|
1,182,054
|
-
|
492,529
|
2,340
|
1,676,923
|
|
1998
|
255,240
|
88,748
|
343,988
|
1,167,802
|
-
|
430,399
|
-
|
1,598,201
|
|
1999
|
216,290
|
81,515
|
297,805
|
1,154,187
|
-
|
292,852
|
-
|
1,447,039
|
|
2000
|
158,515
|
64,303
|
222,818
|
980,510
|
-
|
357,112
|
-
|
1,337,622
|
|
2001
|
196,225
|
61,162
|
257,387
|
661,484
|
-
|
278,957
|
-
|
940,441
|
|
2002
|
173,231
|
59,637
|
232,868
|
661,266
|
-
|
208,273
|
-
|
869,539
|
|
2003
|
153,085
|
59,195
|
212,280
|
687,333
|
-
|
201,631
|
-
|
888,964
|
|
2004
|
149,429
|
59,332
|
208,761
|
741,869
|
-
|
230,875
|
-
|
972,744
|
|
2005
|
139,723
|
61,029
|
200,752
|
739,352
|
-
|
293,261
|
-
|
1,032,613
|
|
2006
|
143,605
|
61,564
|
205,169
|
649,810
|
-
|
295,779
|
-
|
945,589
|
|
2007
|
140,987
|
44,589
|
185,576
|
744,227
|
-
|
304,376
|
-
|
1,048,603
|
Table 04. Number of
HOURS WORKED at Anthracite 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
|
2,536,121
|
99,911
|
1,442,946
|
4,078,978
|
176,978
|
4,255,956
|
|
1979
|
2,592,230
|
68,430
|
1,605,785
|
4,266,445
|
183,985
|
4,450,430
|
|
1980
|
3,324,752
|
132,637
|
1,964,695
|
5,422,084
|
183,842
|
5,605,926
|
|
1981
|
3,517,686
|
145,991
|
1,941,857
|
5,605,534
|
194,824
|
5,800,358
|
|
1982
|
3,517,935
|
97,361
|
1,873,918
|
5,489,214
|
209,240
|
5,698,454
|
|
19831
|
2,721,855
|
68,121
|
1,403,303
|
4,193,279
|
218,525
|
4,411,804
|
|
1984
|
2,757,462
|
89,356
|
1,612,126
|
4,458,944
|
230,847
|
4,689,791
|
|
1985
|
2,491,320
|
96,655
|
1,500,675
|
4,088,650
|
243,753
|
4,332,403
|
|
1986
|
2,858,824
|
103,319
|
1,557,413
|
4,519,556
|
253,740
|
4,773,296
|
|
1987
|
2,154,189
|
80,346
|
1,427,181
|
3,661,716
|
192,918
|
3,854,634
|
|
1988
|
1,946,568
|
81,118
|
1,368,936
|
3,396,622
|
180,809
|
3,577,431
|
|
1989
|
2,010,883
|
69,468
|
1,312,938
|
3,393,289
|
170,544
|
3,563,833
|
|
1990
|
2,226,442
|
79,365
|
1,387,275
|
3,693,082
|
204,525
|
3,897,607
|
|
1991
|
2,031,662
|
74,294
|
1,244,296
|
3,350,252
|
200,885
|
3,551,137
|
|
1992
|
2,102,788
|
42,563
|
1,132,962
|
3,278,313
|
217,780
|
3,496,093
|
|
1993
|
2,004,238
|
41,342
|
1,067,928
|
3,113,508
|
226,880
|
3,340,388
|
|
1994
|
1,868,648
|
54,758
|
1,126,740
|
3,050,146
|
230,701
|
3,280,847
|
|
1995
|
1,900,163
|
47,985
|
1,020,237
|
2,968,385
|
231,456
|
3,199,841
|
|
1996
|
1,951,359
|
20,593
|
1,082,254
|
3,054,206
|
245,377
|
3,299,583
|
|
1997
|
2,025,761
|
10,891
|
1,119,644
|
3,156,296
|
229,680
|
3,385,976
|
|
1998
|
1,942,189
|
10,158
|
1,032,304
|
2,984,651
|
245,259
|
3,229,910
|
|
1999
|
1,744,844
|
5,668
|
1,098,384
|
2,848,896
|
246,660
|
3,095,556
|
|
2000
|
1,560,440
|
-
|
1,029,865
|
2,590,305
|
218,362
|
2,808,667
|
|
2001
|
1,197,828
|
-
|
879,270
|
2,077,098
|
185,860
|
2,262,958
|
|
2002
|
1,102,407
|
5,906
|
829,704
|
1,938,017
|
186,406
|
2,124,423
|
|
2003
|
1,101,244
|
-
|
735,518
|
1,836,762
|
193,867
|
2,030,629
|
|
2004
|
1,181,505
|
-
|
703,337
|
1,884,842
|
187,800
|
2,072,642
|
|
2005
|
1,233,365
|
-
|
672,870
|
1,906,235
|
176,786
|
2,083,021
|
|
2006
|
1,150,758
|
-
|
677,986
|
1,828,744
|
178,870
|
2,007,614
|
|
2007
|
1,234,179
|
-
|
712,321
|
1,946,500
|
206,181
|
2,152,681
|
1Beginning in 1983, only operator data are
available at this level of detail.
|
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