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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