Table 01. Number of Bituminous
Coal Operations 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
|
2,462
|
152
|
2,614
|
3,086
|
53
|
15
|
1
|
3,155
|
1979
|
2,312
|
175
|
2,487
|
2,817
|
32
|
16
|
6
|
2,871
|
1980
|
2,341
|
303
|
2,644
|
2,694
|
30
|
16
|
9
|
2,749
|
1981
|
2,362
|
374
|
2,736
|
2,777
|
32
|
21
|
12
|
2,842
|
1982
|
2,383
|
258
|
2,641
|
2,698
|
39
|
20
|
14
|
2,771
|
1983
|
2,043
|
42
|
2,085
|
2,165
|
36
|
18
|
16
|
2,235
|
1984
|
2,087
|
31
|
2,118
|
2,170
|
50
|
22
|
15
|
2,257
|
1985
|
1,986
|
29
|
2,015
|
2,041
|
52
|
19
|
14
|
2,126
|
1986
|
1,931
|
39
|
1,970
|
1,938
|
52
|
28
|
14
|
2,032
|
1987
|
1,887
|
39
|
1,926
|
1,831
|
71
|
25
|
18
|
1,945
|
1988
|
1,768
|
57
|
1,825
|
1,695
|
90
|
27
|
20
|
1,832
|
1989
|
1,661
|
42
|
1,703
|
1,590
|
90
|
30
|
21
|
1,731
|
1990
|
1,660
|
41
|
1,701
|
1,526
|
92
|
30
|
17
|
1,665
|
1991
|
1,484
|
44
|
1,528
|
1,442
|
82
|
26
|
21
|
1,571
|
1992
|
1,343
|
39
|
1,382
|
1,314
|
80
|
24
|
17
|
1,435
|
1993
|
1,214
|
50
|
1,264
|
1,192
|
83
|
29
|
13
|
1,317
|
1994
|
1,152
|
48
|
1,200
|
1,110
|
97
|
31
|
17
|
1,255
|
1995
|
998
|
30
|
1,028
|
1,022
|
96
|
30
|
14
|
1,162
|
1996
|
898
|
39
|
937
|
891
|
103
|
30
|
15
|
1,039
|
1997
|
895
|
27
|
922
|
862
|
94
|
29
|
15
|
1,000
|
1998
|
841
|
25
|
866
|
814
|
94
|
33
|
19
|
960
|
1999
|
754
|
24
|
778
|
759
|
104
|
30
|
16
|
909
|
2000
|
716
|
18
|
734
|
682
|
84
|
31
|
16
|
813
|
2001
|
727
|
23
|
750
|
695
|
95
|
33
|
15
|
838
|
2002
|
667
|
18
|
685
|
709
|
81
|
33
|
11
|
834
|
2003
|
600
|
19
|
619
|
682
|
72
|
35
|
14
|
803
|
2004
|
606
|
14
|
620
|
715
|
93
|
41
|
10
|
859
|
2005
|
634
|
15
|
649
|
731
|
98
|
46
|
7
|
882
|
2006
|
635
|
19
|
654
|
743
|
107
|
47
|
6
|
903
|
2007
|
600
|
12
|
612
|
724
|
101
|
48
|
8
|
881
|
Table 01. Number of Bituminous
Coal Operations in the United
States, by Primary Activity, 1978-2007ā
continued:
Year
|
Total
Mining
|
Indp Shops/Yrds
|
Prep
Plants
|
Total
w/o Office
|
Office
|
Grand
Total
|
1978
|
5,769
|
156
|
926
|
6,851
|
27
|
6,878
|
1979
|
5,358
|
160
|
961
|
6,479
|
28
|
6,507
|
1980
|
5,393
|
163
|
994
|
6,550
|
42
|
6,592
|
1981
|
5,578
|
164
|
1,083
|
6,825
|
50
|
6,875
|
1982
|
5,412
|
156
|
951
|
6,519
|
44
|
6,563
|
1983
|
4,320
|
142
|
717
|
5,179
|
30
|
5,209
|
1984
|
4,375
|
138
|
709
|
5,222
|
22
|
5,244
|
1985
|
4,141
|
127
|
674
|
4,942
|
32
|
4,974
|
1986
|
4,002
|
117
|
658
|
4,777
|
28
|
4,805
|
1987
|
3,871
|
99
|
647
|
4,617
|
22
|
4,639
|
1988
|
3,657
|
84
|
627
|
4,368
|
34
|
4,402
|
1989
|
3,434
|
84
|
611
|
4,129
|
34
|
4,163
|
1990
|
3,366
|
78
|
589
|
4,033
|
25
|
4,058
|
1991
|
3,099
|
80
|
556
|
3,735
|
27
|
3,762
|
1992
|
2,817
|
76
|
530
|
3,423
|
36
|
3,459
|
1993
|
2,581
|
76
|
501
|
3,158
|
41
|
3,199
|
1994
|
2,455
|
78
|
476
|
3,009
|
28
|
3,037
|
1995
|
2,190
|
74
|
426
|
2,690
|
33
|
2,723
|
1996
|
1,976
|
67
|
410
|
2,453
|
26
|
2,479
|
1997
|
1,922
|
59
|
383
|
2,364
|
28
|
2,392
|
1998
|
1,826
|
57
|
374
|
2,257
|
31
|
2,288
|
1999
|
1,687
|
46
|
350
|
2,083
|
28
|
2,111
|
2000
|
1,547
|
45
|
316
|
1,908
|
25
|
1,933
|
2001
|
1,588
|
54
|
310
|
1,952
|
20
|
1,972
|
2002
|
1,519
|
58
|
315
|
1,892
|
18
|
1,910
|
2003
|
1,422
|
54
|
326
|
1,802
|
23
|
1,825
|
2004
|
1,479
|
46
|
321
|
1,846
|
17
|
1,863
|
2005
|
1,531
|
41
|
322
|
1,894
|
17
|
1,911
|
2006
|
1,557
|
38
|
348
|
1,943
|
12
|
1,955
|
2007
|
1,493
|
38
|
335
|
1,866
|
9
|
1.875
|
|