| Avant -A- O-1-10965 | Great Plains Resources, Inc. | Somerset | Bexar | 5 | 862 | 21 | by Jan 1993 – Apr 1998 |
| Gayle, Susie Knight O-1-9223 | Great Plains Resources, Inc. | Somerset | Bexar | 5 | 861 | 23 | by Jan 1993 – Dec 1995 |
| Hinton, R.S. -B- O-1-8207 | Great Plains Resources, Inc. | Somerset | Bexar | 12 | 842 | 19 | by Jan 1993 – Oct 1997 |
| Korus O-1-11020 | Great Plains Resources, Inc. | Somerset | Bexar | 4 | 827 | 21 | by Jan 1993 – Oct 1995 |
| Hubbard Omega "1985" O-1-11476 | Great Plains Resources, Inc. | Somerset | Bexar | 4 | 819 | 21 | by Jan 1993 – Apr 1998 |
| Nichols, Lucy -A- O-1-10875 | Great Plains Resources, Inc. | Somerset | Atascosa | 6 | 784 | 26 | by Jan 1993 – Jan 1998 |
| Smothers-Gonzales O-1-10911 | Great Plains Resources, Inc. | Somerset | Atascosa | 6 | 772 | 22 | by Jan 1993 – Oct 1997 |
| Cooper -O- O-1-11366 | Great Plains Resources, Inc. | Somerset | Atascosa | 3 | 743 | 26 | by Jan 1993 – May 1998 |
| Lyons -A- O-1-11025 | Great Plains Resources, Inc. | Somerset | Bexar | 7 | 730 | 21 | by Jan 1993 – Dec 1994 |
| Brown, T.H. O-1-12383 | Great Plains Resources, Inc. | Luling-Branyon | Caldwell | 6 | 728 | 614 | by Jan 1993 – Aug 1997 |
| Uribe, Alicia O-1-10928 | Great Plains Resources, Inc. | Somerset | Bexar | 2 | 727 | 23 | by Jan 1993 – Jan 1998 |
| Bailey, John E. O-1-6221 | Great Plains Resources, Inc. | Fairfield | Bexar | 6 | 727 | 6 | Mar 1993 – May 1998 |
| Casias, Robert A. O-1-10773 | Great Plains Resources, Inc. | Somerset | Bexar | 3 | 725 | 24 | by Jan 1993 – Apr 1998 |
| Cooper -N- O-1-11364 | Great Plains Resources, Inc. | Somerset | Atascosa | 4 | 720 | 26 | by Jan 1993 – May 1998 |
| Thompson-Nichols O-1-8261 | Great Plains Resources, Inc. | Somerset | Atascosa | 4 | 705 | 19 | by Jan 1993 – Jan 1998 |
| Baker Tract -A- O-1-11908 | Great Plains Resources, Inc. | Somerset | Bexar | 3 | 694 | 23 | by Jan 1993 – Oct 1995 |
| Cooper -I- O-1-11131 | Great Plains Resources, Inc. | Somerset | Atascosa | 5 | 692 | 24 | by Jan 1993 – May 1998 |
| Hubbard. Vas II O-1-11477 | Great Plains Resources, Inc. | Somerset | Bexar | 3 | 689 | 16 | by Jan 1993 – Apr 1998 |
| Trimmer O-1-10744 | Great Plains Resources, Inc. | Somerset | Atascosa | 6 | 667 | 26 | by Jan 1993 – Jan 1996 |
| Volkmann, Alfred O-1-10146 | Great Plains Resources, Inc. | La Vernia | Guadalupe | 15 | 642 | 4 | Mar 1993 – Apr 1997 |
| Eklund, Carl O-1-3824 | Great Plains Resources, Inc. | Salt Flat | Caldwell | 2 | 619 | 662 | by Jan 1993 – Sep 1997 |
| Thiel, C.C. O-1-11095 | Great Plains Resources, Inc. | Somerset | Bexar | 5 | 597 | 23 | Feb 1993 – May 1998 |
| Lewis, Ray O-1-9261 | Great Plains Resources, Inc. | Fairfield | Bexar | 3 | 592 | 11 | by Jan 1993 – May 1998 |
| Holub, Ernest O-1-6896 | Great Plains Resources, Inc. | Somerset | Bexar | 2 | 579 | 25 | by Jan 1993 – Oct 1995 |
| Harris, Herman O-1-3370 | Great Plains Resources, Inc. | Luling-Branyon | Guadalupe | 8 | 571 | 1.91K | by Jan 1993 – Aug 1997 |
| Dunn, Alice -A- O-1-10990 | Great Plains Resources, Inc. | Somerset | Bexar | 14 | 568 | 20 | by Jan 1993 – Apr 1998 |
| Ecklund -B- O-1-2914 | Great Plains Resources, Inc. | Salt Flat | Caldwell | 2 | 565 | 20 | by Jan 1993 – Apr 1997 |
| Barker -S- O-1-10942 | Great Plains Resources, Inc. | Somerset | Bexar | 5 | 562 | 15 | by Jan 1993 – Apr 1998 |
| May, D.C. O-1-10919 | Great Plains Resources, Inc. | Somerset | Atascosa | 6 | 554 | 20 | by Jan 1993 – Apr 1998 |
| Sanchez, B. Unit O-1-11080 | Great Plains Resources, Inc. | Somerset | Bexar | 2 | 552 | 26 | by Jan 1993 – Nov 1997 |
| Eklund O-1-3568 | Great Plains Resources, Inc. | Salt Flat | Caldwell | 4 | 549 | 230 | by Jan 1993 – Dec 1997 |
| McClanahan O-1-8781 | Great Plains Resources, Inc. | Salt Flat | Caldwell | 2 | 545 | 32 | Feb 1993 – Dec 1997 |
| Prater, Joseph O-1-11278 | Great Plains Resources, Inc. | Somerset | Atascosa | 4 | 530 | 23 | by Jan 1993 – Dec 1996 |
| Bursell -B- O-1-10979 | Great Plains Resources, Inc. | Somerset | Bexar | 4 | 519 | 21 | by Jan 1993 – Apr 1998 |
| Nichols, Lucy O-1-10874 | Great Plains Resources, Inc. | Somerset | Atascosa | 2 | 509 | 26 | by Jan 1993 – Oct 1997 |
| Keller O-1-11635 | Great Plains Resources, Inc. | Somerset | Bexar | 4 | 494 | 25 | by Jan 1993 – Oct 1995 |
| Klemcke -B- O-1-11008 | Great Plains Resources, Inc. | Somerset | Bexar | 3 | 488 | 20 | by Jan 1993 – Aug 1996 |
| Hernandez, I.G. O-1-10863 | Great Plains Resources, Inc. | Somerset | Atascosa | 11 | 485 | 25 | by Jan 1993 – Nov 1995 |
| Thiel, M.C. O-1-11204 | Great Plains Resources, Inc. | Somerset | Bexar | 3 | 467 | 20 | by Jan 1993 – May 1998 |
| Cooper -Z- O-1-11363 | Great Plains Resources, Inc. | Somerset | Atascosa | 4 | 463 | 21 | by Jan 1993 – May 1998 |
| Koehler O-1-11305 | Great Plains Resources, Inc. | Somerset | Bexar | 4 | 452 | 88 | by Jan 1993 – Feb 2007 |
| Fowler, Ima et Al O-1-10807 | Great Plains Resources, Inc. | Somerset | Atascosa | 14 | 438 | 18 | by Jan 1993 – Jan 1996 |
| Geyer -C- O-1-11118 | Great Plains Resources, Inc. | Somerset | Bexar | 5 | 430 | 21 | by Jan 1993 – Apr 1998 |
| O'Brien, E.M. O-1-11306 | Great Plains Resources, Inc. | Somerset | Bexar | 3 | 414 | 17 | by Jan 1993 – Apr 1998 |
| Chapman O-1-11098 | Great Plains Resources, Inc. | Somerset | Bexar | 4 | 409 | 16 | by Jan 1993 – Dec 1997 |
| McOsker -C- O-1-11388 | Great Plains Resources, Inc. | Somerset | Bexar | 5 | 395 | 1 | by Jan 1993 – Apr 1998 |
| Shaper O-1-11058 | Great Plains Resources, Inc. | Somerset | Bexar | 7 | 386 | 19 | by Jan 1993 – Apr 1998 |
| Korus Omega -C- O-1-11466 | Great Plains Resources, Inc. | Somerset | Bexar | 2 | 380 | 16 | by Jan 1993 – Oct 1995 |
| Jackel -B- O-1-11085 | Great Plains Resources, Inc. | Somerset | Bexar | 10 | 380 | 0 | Oct 1994 – Nov 1995 |
| Kurz, Eva -7A- O-1-12839 | Great Plains Resources, Inc. | Somerset | Bexar | 1 | 368 | 21 | by Jan 1993 – Apr 1998 |