Table 03. Average
Number of Employees 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
|
468
|
83
|
551
|
1,289
|
-
|
206
|
7
|
1,502
|
|
1979
|
416
|
58
|
474
|
1,063
|
-
|
221
|
7
|
1,291
|
|
1980
|
426
|
56
|
482
|
1,418
|
-
|
202
|
8
|
1,628
|
|
1981
|
482
|
78
|
560
|
1,516
|
-
|
192
|
9
|
1,717
|
|
1982
|
513
|
90
|
603
|
1,412
|
-
|
172
|
11
|
1,595
|
|
19831
|
479
|
95
|
574
|
1,133
|
-
|
184
|
12
|
1,329
|
|
1984
|
513
|
110
|
623
|
1,129
|
-
|
199
|
13
|
1,341
|
|
1985
|
482
|
107
|
589
|
917
|
-
|
187
|
15
|
1,119
|
|
1986
|
515
|
123
|
638
|
976
|
-
|
216
|
13
|
1,205
|
|
1987
|
419
|
120
|
539
|
761
|
-
|
179
|
12
|
952
|
|
1988
|
391
|
128
|
519
|
683
|
-
|
180
|
9
|
872
|
|
1989
|
330
|
108
|
438
|
724
|
-
|
154
|
7
|
885
|
|
1990
|
317
|
99
|
416
|
695
|
-
|
250
|
4
|
949
|
|
1991
|
293
|
95
|
388
|
665
|
-
|
273
|
5
|
943
|
|
1992
|
267
|
97
|
364
|
625
|
-
|
309
|
4
|
938
|
|
1993
|
222
|
75
|
297
|
554
|
-
|
372
|
3
|
929
|
|
1994
|
207
|
73
|
280
|
598
|
-
|
301
|
4
|
903
|
|
1995
|
202
|
65
|
267
|
522
|
-
|
327
|
2
|
851
|
|
1996
|
186
|
60
|
246
|
572
|
-
|
319
|
3
|
894
|
|
1997
|
187
|
66
|
253
|
630
|
-
|
306
|
2
|
938
|
|
1998
|
180
|
70
|
250
|
657
|
-
|
248
|
-
|
905
|
|
1999
|
161
|
60
|
221
|
630
|
-
|
173
|
-
|
803
|
| |