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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

2001

110

3

113

3,902

12

-

3,914

2002

118

3

121

3,927

9

-

3,936

2003

118

2

120

3,966

9

-

3,975

2004

123

1

124

4,024

8

-

4,032

2005

124

2

126

4,108

7

-

4,115

2006

120

2

122

4,197

4

-

4,201

2007

110

3

113

4,267

6

-

4,273


 

 

Table 01. Number of Stone Operations in the

United States, by Primary Activity, 1978-2007 continued:

 

 

Year

Total Mining

Indp Shops/Yrds

Mills

Total w/o Office

Office

Grand Total

1978

3,633

33

266

3,932

18

3,950

1979

3,843

28

276

4,147

16

4,163

1980 1/

3,866

22

312

4,200

18

4,218

1981

3,872

20

383

4,275

24

4,299

1982

3,224

19

317

3,560

43

3,603

1983

3,386

17

252

3,655

25

3,680

1984

3,397

14

276

3,687

31

3,718

1985

3,510

15

273

3,798

44

3,842

1986

3,319

12

249

3,580

19

3,599

1987

3,339

13

241

3,593

12

3,605

1988

3,412

15

226

3,653

10

3,663

1989

3,370

15

213

3,598

16

3,614

1990

3,395

16

230

3,641

9

3,650

1991

3,360

15

235

3,610

17

3,627

1992

3,395

15

239

3,639

15

3,654

1993

3,392

15

258

3,665

16

3,681

1994

3,389

19

215

3,623

23

3,646

1995

3,398

20

212

3,630

19

3,649

1996

3,412

20

207

3,639

16

3,655

1997

3,476

18

212

3,706

6

3,712

1998

3,578

15

215

3,808

14

3,822

1999

3,718

13

218

3,949

13

3,962

2000

3,869

11

215

4,095

18

4,113

2001

4,027

12

216

4,255

27

4,282

2002

4,057

13

213

4,283

28

4,311

2003

4,095

14

211

4,320

37

4,357

2004

4,156

16

205

4,377

24

4,401

2005

4,241

15

201

4,457

33

4,490

2006

4,323

16

201

4,540

33

4,573

2007

4,386

17

210

4,613

26

4,797

 



[1] Beginning in 1980, independent contractors working on mine property performing mine exploration, development, production, maintenance, repair and construction work were assigned an identification number, and reported to MSHA, and are included in the count of operations. Since 1983, the contractors were separated from the mines.