Year

Underground

Mines

Surface Mines

Grand

Total

Strip

Auger

Culm Bank

Dredge

Total

1978

229,075,592

398,166,766

2,521,664

1,958,975

28,099

402,675,504

631,751,096

1979

300,440,004

437,419,278

1,906,995

1,865,310

67,852

441,259,435

741,699,439

1980

321,018,628

473,618,132

1,348,373

1,973,676

122,925

477,063,106

798,081,734

1981

299,425,866

484,305,551

1,621,326

2,128,428

129,738

488,185,043

787,610,909

1982

328,610,350

479,283,066

1,850,723

1,552,917

274,416

482,961,122

811,571,472

1983

292,164,426

466,278,990

2,494,683

1,274,891

186,334

470,234,898

762,399,324

1984

343,167,938

536,880,553

2,309,297

1,286,207

184,707

540,660,764

883,828,702

1985

343,560,086

515,385,098

2,627,423

1,452,495

166,423

519,631,439

863,191,525

1986

353,625,702

522,090,887

2,671,658

1,496,635

160,093

526,419,273

880,044,975

1987

364,940,375

533,180,473

3,860,736

1,849,323

195,112

539,085,644

904,026,019

1988

377,463,230

560,131,269

4,494,464

1,685,835

163,191

566,474,759

943,937,989

1989

387,696,287

577,754,203

4,194,720

1,829,376

276,268

584,054,567

971,750,854

1990

419,899,597

593,296,810

3,872,704

1,995,820

277,847

599,443,181

1,019,342,778

1991

404,295,712

577,090,401

3,877,363

2,060,539

428,961

583,457,264

987,752,976

1992

403,932,688

579,003,898

3,971,728

2,252,039

261,904

585,489,569

989,422,257

1993

348,436,286

588,692,235

3,426,536

2,585,492

149,359

594,853,622

943,289,908

1994

396,610,662

626,762,567

5,044,681

2,951,491

325,784

635,084,523

1,031,695,185

1995

396,140,037

627,888,671

4,760,956

2,901,514

393,870

635,945,011

1,032,085,048

1996

410,577,156

644,869,796

5,986,303

3,593,872

360,690

654,810,661

1,065,387,817

1997

419,810,539

660,973,232

6,624,108

4,240,032

484,258

672,321,630

1,092,132,169

1998

419,653,258

691,040,178

6,617,919

4,120,246

610,853

702,389,196

1,122,042,454

1999

391,685,324

696,679,837

6,939,153

3,765,207

857,496

708,241,693

1,099,927,017

2000

373,754,882

692,754,745

7,630,012

3,903,901

1,022,144

705,310,802

1,079,065,684

2001

380,919,546

740,817,397

6,217,762

1,306,446

1,071,387

749,412,992

1,130,332,538

2002

358,534,766

731,458,534

5,690,122

390,126

710,084

738,248,866

1,096,783,632

2003

352,615,521

714,161,776

      4,590,637

415,224

573,305

719,740,942

1,072,356,463

2004

367,147,343

737,927,706

6,364,626

474,132

509,749

745,276,213

1,112,423,556

2005

369,370,807

756,330,108

8,597,856

382,615

351,629

765,662,208

1,135,033,015

2006

359,344,662

794,806,452

9,659,920

385,171

379,918

805,231,461

1,164,576,123

2007

351,996,028

785,000,352

9,592,411

847,163

308,346

795,748,272

1,147,744,300