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Table 01. Number of Metallic 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

419

17

436

195

9

7

211

1979

438

26

464

222

7

3

232

1980[1]

592

71

663

369

10

4

383

1981

685

144

829

482

9

1

492

1982

551

84

635

388

8

2

398

1983

371

40

411

289

9

-

298

1984

312

30

342

271

9

-

280

1985

258

27

285

259

7

-

266

1986

223

31

254

252

8

-

260

1987

223

26

249

281

8

-

289

1988

216

21

237

295

8

-

303

1989

211

22

233

294

7

-

301

1990

198

14

212

269

7

-

276

1991

143

21

164

220

6

-

226

1992

123

16

139

200

7

-

207

1993

112

5

117

185

7

3

195

1994

117

5

122

148

6

33

187

1995

112

6

118

139

6

31

176

1996

102

10

112

137

6

23

166

1997

97

13

110

133

6

23

162

1998

95

10

105

120

5

17

142

1999

96

8

104

122

5

13

140

2000

86

11

97

110

5

15

130

2001

69

9

78

108

6

10

124

2002

61

5

66

101

6

9

116

2003

62

8

70

95

6

9

110

2004

66

7

73

98

5

11

114

2005

70

6

76

101

6

16

123

2006

80

9

89

102

6

16

124

2007

81

15

96

104

5

12

121

 

 

1

 


 

Table 01. Number of Metallic 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

647

11

144

802

13

815

1979

696

11

170

877

13

890

1980

1,046

12

246

1,304

15

1,319

1981

1,321

15

394

1,730

25

1,755

1982

1,033

10

303

1,346

48

1,394

1983

709

8

190

907

33

940

1984

622

7

191

820

21

841

1985

551

7

173

731

19

750

1986

514

6

170

690

21

711

1987

538

6

157

701

21

722

1988

540

6

169

715

31

746

1989

534

5

154

693

15

708

1990

488

5

134

627

13

640

1991

390

5

125

520

13

533

1992

346

3

113

462

7

469

1993

312

3

106

421

8

429

1994

309

3

95

407

6

413

1995

294

3

102

399

4

403

1996

278

2

97

377

4

381

1997

272

2

94

368

6

374

1998

247

2

88

337

6

343

1999

244

2

83

329

5

334

2000

227

2

73

302

7

309

2001

202

2

70

274

7

281

2002

182

2

66

250

6

256

2003

180

2

67

249

9

258

2004

187

2

57

246

5

251

2005

199

2

58

259

4

263

2006

213

3

57

273

7

280

2007

217

3

52

272

6

278

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 



[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.