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Table 02. Average Number of EMPLOYEES at 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

1,882

528

2,410

35,657

342

-

35,999

1979

1,921

479

2,400

38,731

371

-

39,102

1980

1,876

434

2,310

37,402

296

-

37,698

1981

1,649

432

2,081

34,069

323

-

34,392

1982

1,474

450

1,924

29,039

201

-

29,240

1983 [1]

1,357

411

1,768

29,336

151

-

29,487

1984

1,494

396

1,890

30,917

184

-

31,101

1985

1,435

432

1,867

31,823

237

-

32,060

1986

1,470

361

1,831

31,428

199

-

31,627

1987

1,486

392

1,878

31,074

217

-

31,291

1988

1,469

452

1,921

30,970

147

-

31,117

1989

1,537

482

2,019

29,746

166

-

29,912

1990

1,547

492

2,039

28,949

178

-

29,127

1991

1,495

449

1,944

27,521

111

-

27,632

1992

1,504

489

1,993

27,465

 85

-

27,550

1993

1,535

454

1,989

27,843

 87

-

27,930

1994

1,617

339

1,956

29,282

97

-

29,379

1995

1,617

323

1,940

28,928

100

-

29,028

1996

1,582

290

1,872

28,225

108

-

28,333

1997

1,650

289

1,939

29,010

95

-

29,105

1998

1,727

334

2,061

30,024

54

-

30,078

1999

1,743

356

2,099

31,221

42

-

31,263

2000

1,816

415

2,231

32,030

71

5

32,106

2001

1,810

419

2,229

32,222