Table 01. Number of Anthracite Operations 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
|
75
|
3
|
78
|
90
|
-
|
46
|
2
|
138
|
|
1979
|
59
|
-
|
59
|
76
|
-
|
39
|
2
|
117
|
|
1980
|
66
|
-
|
66
|
89
|
-
|
42
|
3
|
134
|
|
1981
|
86
|
-
|
86
|
103
|
-
|
38
|
3
|
144
|
|
1982
|
85
|
1
|
86
|
92
|
-
|
34
|
4
|
130
|
|
1983
|
86
|
2
|
88
|
91
|
-
|
32
|
4
|
127
|
|
1984
|
97
|
-
|
97
|
89
|
-
|
31
|
4
|
124
|
|
1985
|
87
|
1
|
88
|
84
|
-
|
35
|
4
|
123
|
|
1986
|
95
|
-
|
95
|
94
|
-
|
38
|
4
|
136
|
|
1987
|
82
|
1
|
83
|
87
|
-
|
30
|
4
|
121
|
|
1988
|
86
|
2
|
88
|
81
|
-
|
29
|
4
|
114
|
|
1989
|
78
|
-
|
78
|
75
|
-
|
27
|
4
|
106
|
|
1990
|
75
|
1
|
76
|
77
|
-
|
37
|
3
|
117
|
|
1991
|
74
|
3
|
77
|
73
|
-
|
46
|
3
|
122
|
|
1992
|
72
|
1
|
73
|
66
|
-
|
40
|
2
|
108
|
|
1993
|
58
|
1
|
59
|
66
|
-
|
44
|
2
|
112
|
|
1994
|
55
|
1
|
56
|
66
|
-
|
49
|
2
|
117
|
|
1995
|
51
|
2
|
53
|
64
|
-
|
47
|
2
|
113
|
|
1996
|
42
|
2
|
44
|
63
|
-
|
47
|
3
|
113
|
|
1997
|
45
|
1
|
46
|
67
|
-
|
48
|
2
|
117
|
|
1998
|
42
|
2
|
44
|
68
|
-
|
41
|
-
|
109
|
|
1999
|
38
|
1
|
39
|
69
|
-
|
33
|
-
|
102
|
|
2000
|
36
|
1
|
37
|
65
|
-
|
42
|
-
|
107
|
|
2001
|
27
|
-
|
27
|
59
|
-
|
40
|
-
|
99
|
|
2002
|
26
|
-
|
26
|
52
|
-
|
35
|
-
|
87
|
|
2003
|
22
|
2
|
24
|
49
|
-
|
31
|
-
|
80
|
|
2004
|
21
|
1
|
22
|
55
|
-
|
30
|
-
|
85
|
|
2005
|
18
|
3
|
21
|
60
|
-
|
31
|
-
|
91
|
|
2006
|
19
|
-
|
19
|
67
|
-
|
32
|
-
|
99
|
|
2007
|
16
|
-
|
16
|
62
|
-
|
34
|
-
|
96
|
Table 01. Number of Anthracite Operations in the United States,
by Primary Activity,
1978-2007continued:
|
Year
|
Total
Mining
|
Indp
Shops/Yrds
|
Prep
Plants
|
Total
w/o Office
|
Office
|
Grand
Total
|
|
1978
|
216
|
5
|
62
|
283
|
1
|
284
|
|
1979
|
176
|
3
|
56
|
235
|
1
|
236
|
|
1980
|
200
|
5
|
69
|
274
|
-
|
274
|
|
1981
|
230
|
5
|
72
|
307
|
-
|
307
|
|
1982
|
216
|
4
|
78
|
298
|
-
|
298
|
|
1983
|
215
|
5
|
64
|
284
|
3
|
287
|
|
1984
|
221
|
5
|
67
|
293
|
1
|
294
|
|
1985
|
211
|
5
|
66
|
282
|
-
|
282
|
|
1986
|
231
|
5
|
74
|
310
|
-
|
310
|
|
1987
|
204
|
5
|
69
|
278
|
1
|
279
|
|
1988
|
202
|
5
|
64
|
271
|
1
|
272
|
|
1989
|
184
|
3
|
59
|
246
|
5
|
251
|
|
1990
|
193
|
4
|
62
|
259
|
3
|
262
|
|
1991
|
199
|
3
|
60
|
262
|
1
|
263
|
|
1992
|
181
|
3
|
58
|
242
|
2
|
244
|
|
1993
|
171
|
3
|
53
|
227
|
3
|
230
|
|
1994
|
173
|
3
|
52
|
228
|
3
|
231
|
|
1995
|
166
|
3
|
52
|
221
|
2
|
223
|
|
1996
|
157
|
3
|
48
|
208
|
2
|
210
|
|
1997
|
163
|
2
|
49
|
214
|
3
|
217
|
|
1998
|
153
|
1
|
48
|
202
|
3
|
205
|
|
1999
|
141
|
1
|
49
|
191
|
4
|
195
|
|
2000
|
144
|
-
|
47
|
191
|
-
|
191
|
|
2001
|
126
|
-
|
44
|
170
|
2
|
172
|
|
2002
|
113
|
1
|
40
|
154
|
1
|
155
|
|
2003
|
104
|
-
|
43
|
147
|
-
|
147
|
|
2004
|
107
|
-
|
41
|
148
|
-
|
148
|
|
2005
|
112
|
-
|
40
|
152
|
-
|
152
|
|
2006
|
118
|
-
|
40
|
158
|
-
|
158
|
|
2007
|
112
|
-
|
43
|
155
|
-
|
155
|
