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Table 01. Number of Stone Operations in the

 United States, by Primary Activity, 1978-2007


 

Underground Mines

Surface Mines

Year

Underground

Surf at UG

Total

Strip

Dredge

Other

Total

1978

135

4

139

3,473

21

-

3,494

1979

133

2

135

3,687

21

-

3,708

1980[1]

134

1

135

3,716

15

-

3,731

1981

128

5

133

3,723

16

-

3,739

1982

122

5

127

3,085

12

-

3,097

1983

117

2

119

3,259

8

-

3,267

1984

110

4

114

3,273

10

-

3,283

1985

110

-

110

3,388

12

-

3,400

1986

111

1

112

3,194

13

-

3,207

1987

108

2

110

3,215

14

-

3,229

1988

106

4

110

3,290

12

-

3,302

1989

108

1

109

3,248

13

-

3,261

1990

106

2

108

3,273

14

-

3,287

1991

107

1

108

3,243

9

-

3,252

1992

104

2

106

3,270

9

-

3,279

1993

104

-

104

3,279

9

-

3,288

1994

103

-

103

3,275

11

-

3,286

1995

101

1

102

3,286

10

-

3,296

1996

100

1

101

3,301

10

-

3,311

1997

103

1

104

3,363

9

-

3,363

1998

108

1

109

3,463

6

-

3,469

1999

113

-

113

3,599

6

-

3,605

2000

117

1

118

3,741

9

1

3,751