Year

Underground Mines

Surface Mines

Underground

Surf at UG

Total

Strip

Dredge

Other

Total

1978

11,438,025

2,179,736

13,617,761

20,783,131

38,710

495,864

21,317,705

1979

12,306,045

2,589,525

14,895,570

26,960,041

8,563

435,598

21,404,202

1980

12,358,364

3,425,920

15,784,284

21,693,176

8,770

235,872

21,937,818

1981

12,643,607

3,937,086

16,580,693

20,871,842

11,924

44,316

20,928,082

1982

10,608,220

4,100,370

14,708,590

13,558,942

23,056

39,470

13,621,468

1983  1/

8,098,523

1,499,524

9,598,047

13,541,934

245,367

34,541

13,821,842

1984

8,455,444

1,468,839

9,924,283

14,969,337

457,948

34,271

15,461,556

1985

7,637,052

1,356,430

8,993,482

14,267,580

433,691

34,162

14,735,433

1986

6,826,953

1,271,831

8,098,784

12,760,161

395,473

20,687

13,176,321

1987

6,617,507

1,251,169

7,868,676

12,694,901

250,355

-

12,945,256

1988

7,273,046

1,299,567

8,572,613

13,027,611

263,395

-

13,291,006

1989

7,578,462

1,394,173

8,972,635

13,015,545

288,386

-

13,303,931

1990

7,609,520

1,426,264

9,035,784

12,932,823

72,321

-

13,005,144

1991

7,419,300

1,217,164

8,636,464

12,168,823

184,038

-

12,352,861

1992

7,253,717

1,262,899

8,516,616

11,353,982

157,344

-

11,511,326

1993

6,710,232

1,202,545

7,912,777

10,881,579

39,857

-

10,921,436

1994

6,659,681

1,349,121

8,008,802

11,215,499

26,590

-

11,242,089

1995

6,486,790

1,142,803

7,629,593

11,337,739

24,473

-

11,362,212

1996

6,602,819

1,196,274

7,799,093

11,658,440

29,247

-

11,687,687

1997

6,457,444

823,770

7,281,214

11,420,435

29,578

-

11,450,013

1998

5,862,116

737,269

6,599,385

11,384,645

93,468

-

11,478,113

1999

5,437,330

836,185

6,273,515

10,937,456

118,365

34,912

11,090,733

2000

5,052,716

794,600

5,847,316

11,065,553

31,814

-

11,097,367

2001

5,183,266

795,107

5,978,373

10,305,812

33,761

-

10,339,573