Table 03. Average Number of
Employees at Coal Mines in the United
States, by Primary Activity, 1978-2006
|
Year
|
Underground
Mines
|
Surface
Mines
|
|
|
Underground
|
Surf
at UG
|
Total
|
Strip
|
Auger
|
Culm
Bank
|
Dredge
|
Total
|
|
1978
|
128,076
|
15,917
|
143,993
|
74,227
|
1,059
|
361
|
21
|
75,668
|
|
1979
|
132,928
|
15,997
|
148,925
|
73,244
|
636
|
362
|
44
|
74,286
|
|
1980
|
127,169
|
15,480
|
142,649
|
70,776
|
584
|
360
|
70
|
71,790
|
|
1981
|
121,702
|
15,603
|
137,305
|
72,062
|
793
|
342
|
120
|
73,317
|
|
1982
|
118,760
|
14,115
|
132,875
|
69,972
|
597
|
409
|
111
|
71,089
|
|
1983
|
89,803
|
11,681
|
101,484
|
63,306
|
592
|
363
|
114
|
64,375
|
|
1984
|
93,554
|
11,823
|
105,377
|
67,622
|
563
|
368
|
120
|
68,673
|
|
1985
|
89,073
|
11,959
|
101,012
|
62,516
|
628
|
382
|
126
|
63,652
|
|
1986
|
82,643
|
11,513
|
94,156
|
59,404
|
611
|
479
|
109
|
60,603
|
|
1987
|
75,297
|
10,502
|
85,799
|
56,886
|
884
|
516
|
169
|
58,455
|
|
1988
|
71,775
|
10,194
|
81,969
|
54,753
|
910
|
486
|
186
|
56,335
|
|
1989
|
69,589
|
10,612
|
80,201
|
53,518
|
900
|
532
|
187
|
55,137
|
|
1990
|
70,955
|
11,486
|
82,441
|
54,940
|
874
|
607
|
147
|
56,568
|
|
1991
|
64,591
|
11,784
|
76,375
|
5l,752
|
872
|
648
|
118
|
53,390
|
|
1992
|
60,378
|
11,616
|
71,994
|
50,487
|
957
|
671
|
109
|
52,224
|
|
1993
|
52,427
|
11,699
|
64,126
|
48,365
|
767
|
1,196
|
83
|
50,411
|
|
1994
|
53,936
|
11,423
|
65,359
|
48,771
|
884
|
797
|
112
|
50,564
|
|
1995
|
49,437
|
10,385
|
59,822
|
44,918
|
867
|
759
|
93
|
46,637
|
|
1996
|
46,819
|
10,086
|
56,905
|
43,550
|
1,027
|
809
|
245
|
45,631
|
|
1997
|
45,755
|
10,114
|
55,869
|
44,152
|
1,179
|
896
|
147
|
46,374
|
|
1998
|
44,240
|
9,044
|
53,284
|
43,457
|
1,102
|
753
|
293
|
45,605
|
|
1999
|
40,248
|
8,813
|
49,061
|
41,532</ | |
