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Table 01. Number of Nonmetallic Operations in the United States,

 by Primary Activity, 1978-2007

 

Year

Underground Mines

Surface Mines

 

Underground

Surf at UG

Total

Strip

Dredge

Other

Total

1978

119

7

126

1,110

4

21

1,135

1979

108

4

112

1,060

2

18

1,080

1980[1]

125

42

167

1,081

2

9

1,092

1981

147

66

213

1,064

2

1

1,067

1982

143

40

183

866

1

1

868

1983 

90

4

94

782

3

1

786

1984

88

2

90

774

4

1

779

1985

91

1

92

777

5

1

783

1986

86

2

88

728

4

1

733

1987

74

-

74

678

4

-

682

1988

77

3

80

668

2

-

670

1989

75

2

77

673

3

-

676

1990

72

2

74

677

2

-

679

1991

66

3

69

642

2

-

644

1992

63

4

67

593

2

-

595

1993

60

2

62

595

2

-

597

1994

56

7

63

581

2

-

583

1995

53

4

57

568

2

-

570

1996

46

4

50

545

2

-

547

1997

46

2

48

540

2

-

542

1998

46

4

50

554

2

-

556

1999

47

3

50

564

1

1

566

2000

45

2

47

578

3

-

581