Here is the information I have. The source is Jay Reed's "Comprehensive Guide to Industrial Locomotives".
The data is said to be current as of 1998. I started this research as part of a write-up I'd promised to do for Steve Thomason's "Industrial Narrow Gauge" website, but sad to say the project got sidetracked by other demands on my time (not to mention general laziness) and was never completed. Hope it's of some use.
1. Cobb Resources, Fairplay, CO. 18/24 in. ga.
2. Standard Metals Co., Silverton CO. 24 and 36 in. ga.
3. Monterey Coal Co., Albers, IL. 42 in. ga.
4. Monterey Coal Co., Carlinville, IL. 42 in. ga.
5. Kerr-McGee chemical Corp. Forest Products Div. Madison, IL. 30 in. ga.
6. Kerr-Mcgee Chemical Corp, Beech Grove IN. 30 in. ga.
7. Sidney Coal, Sidney, KY. 42 in. ga.
8. Amax Lead of Missouri, Boss, MO. 48 in. ga.
9. Kerr-McGee Chemical Corp. Forest Products Div., Springfield, MO. 30 in. ga.
10. ASARCO, Omaha, NE. 36 in. ga.
11. U.S. Dept. of Energy, NV Test Site. 36 in. ga.
12. Molycorp, Inc., Questa, NM. 42 in. ga.
13. Austin Powder Co., Mc Arthur, OH. 36 in. ga.
14. Ohio Steel Tube, Div., Copperweld. Shelby, OH. 36 in. ga.
15. Stone Creek Brick Co., Stone Creek, OH. 36 in. ga.
16. Copperweld Steel, Warren, OH. 36 in. ga.
17. Dolese Co., Richards Spur, OK. 36 in. ga.
18. Kerr-McGee Chemical Co., The Dalles, OR. 29.5 in. ga.
19. U.S. Bureau of Mines Exp. Station, Experiment, PA. 42 in. ga.
20. Cyprus-Amax coal Co, Cumberland Mine, Kirby, PA. 44 in. ga.
21. Consolidation Coal Co., Washington, PA. 42 in. ga.
22. Cyprus emerald Resources Corp., Emerald Mine, Waynesburg, PA. 44 in. ga.
23. Dixie Clay Co., Bath, SC. 36 in. ga.
24. Palmetto Brick Co., Wallace SC. 36 in. ga.
25. Jersey Miniere Zinc Co., Gordonsville, TN. 36 in. ga.
26. ASARCO-Young Mine, Hodges (Strawberry Plains) TN. 48 in. ga.
27. ASARCO, Jefferson City, TN. 48 in. ga.
28. ASARCO-Tenessee Mines Div., Mascot, TN. 48 in. ga.
29. Phelps Dodge Corp., El Paso, TX. 30 in. ga.
30. NL industries-Texas mining and Smelting Div., Laredo, TX. 24 in. ga.
31. Anaconda Co., Tooele, UT. 42 in. ga.
32. Virginia Pocahontis-Gund #1 mine, Dwight, VA. 48 in. ga.
33. Virginia Pocahontis #2 Mine, Hamilton (Dwight), VA. 48 in. ga.
34. Blue Ridge Talc Co., Henry, VA. 36 in. ga.
35. Virginia Pocahontas #5 Mine, Koenig (Deskins) VA. 48 in. ga.
36. Consolidation Coal Co., Buchanan Mine #1, Mavisdale, VA. 44 in. ga.
37. Clinchfield Coal Co., McClure River #1 Mine, ?, VA. 48 in. ga.
38. Virginia Pocahontas-Beatrice Mine #1, Oakwood, VA. 48 in. ga.
39. Virginia Pocahontas #6 mine, Rowe, VA. 48 in. ga.
40. Virginia Pocahontas #3 Mine, Vansant, VA. 48 in. ga.
41. Island Creek Coal Co., Dobbin #1 Mine, Bayard, WV. 42 in. ga.
42. INCO Alloys international, Huntington, WV. 30 in. ga.
43. Island Creek Coal Co., Guyan #5 Mine, Kelly, WV. 48 in. ga.
44. Buffalo Mining Co., Kermit, WV. 48 in. ga.
45. Consolidation Coal Co., Dent's Run Mine #79, Mannington, WV. 42 in. ga.
46. Consolidation Coal Co., Ireland Mine, Moundsville, WV. 42 in. ga.
47. Consolidation Coal Co., Maitland Mine, Welch, WV. 44 in. ga.
48. Consolidation Coal co., Wyoming, WV. 42 in. ga.
49. United States Steel, Shawnee Mine, Wyoming county, WV. 42 in. ga.
At this point I realize I'm missing a page from my handwritten notes - there were several additional operations not listed here. The total by gauge was as follows:
24 in. - 6
30 in. - 6
36 in. - 13
42 in. - 11
44 in. - 4
48 in. - 13
