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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

2001

42

2

44

540

2

-

542

2002

41

-

41

520

1

3

524

2003

41

1

42

503

2

2

507

2004

45

-

45

505

4

2

511

2005

44

1

45

503

5

2

510

2006

44

1

45

498

4

2

504

2007

47

-

47

490

3

2

495

Table 01. Number of Nonmetallic 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

1,261

4

465

1,730

7

1,737

1979

1,192

4

430

1,626

10

1,636

1980

1,259

3

328

1,590

14

1,604

1981

1,280

2

405

1,687

19

1,706

1982

1,051

3

359

1,413

28

1,441

1983 

880

2

278

1,160

15

1,175

1984

869

3

263

1,135

22

1,157

1985

875

4

257

1,136

20

1,156

1986

821

4

231

1,056

15

1,071

1987

756

2

231

989

11

1,000

1988

750

2

222

974

10

984

1989

753

1

207

961

9

970

1990

753

-

212

965

18

983

1991

713

-

194

907

12

919

1992

662

-

178

840

15

855

1993

659

-

184

843

9

852

1994

646

-

178

824

11

835

1995

627

-

176

803

6

809

1996

597

-

177

774

7

781

1997

590

-

184

774

12

786

1998

606

-

183

789

12

801

1999

616

-

179

795

13

808

2000

628

-

178

806

15

821

2001

586

-

179

765

20

785

2002

565

-

177

742

21

763

2003

549

-

169

718

16

734

2004

556

-

167

723

18

741

2005

555

-

171

726

13

739

2006

549

-

171

720

21

741

2007

542

-

163

705

20

725

 


[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.