| Geyer O-1-10769 | Great Plains Resources, Inc. | Somerset | Atascosa | 15 | 1.75K | 26 | Jan 1993 – Apr 1998 |
| Wood, Mae Lou O-1-11096 | Great Plains Resources, Inc. | Somerset | Atascosa | 18 | 1.59K | 25 | Jan 1993 – May 1998 |
| Cooper -T- O-1-11073 | Great Plains Resources, Inc. | Somerset | Atascosa | 6 | 1.54K | 26 | Jan 1993 – May 1998 |
| Cooper -F- O-1-10983 | Great Plains Resources, Inc. | Somerset | Atascosa | 13 | 1.49K | 26 | Jan 1993 – May 1998 |
| Fowler, F.J. O-1-10855 | Great Plains Resources, Inc. | Somerset | Atascosa | 5 | 1.27K | 25 | Jan 1993 – Dec 1997 |
| Farran O-1-11548 | Great Plains Resources, Inc. | Somerset | Atascosa | 7 | 1.25K | 26 | Jan 1993 – May 1998 |
| Cooper -C- O-1-10982 | Great Plains Resources, Inc. | Somerset | Atascosa | 6 | 1.15K | 25 | Jan 1993 – May 1998 |
| Buchsenschutz, R. O-1-10761 | Great Plains Resources, Inc. | Somerset | Atascosa | 9 | 1.01K | 25 | Jan 1993 – Oct 1995 |
| Cooper -P- O-1-10987 | Great Plains Resources, Inc. | Somerset | Atascosa | 11 | 959 | 26 | Jan 1993 – May 1998 |
| Cooper -K- O-1-10986 | Great Plains Resources, Inc. | Somerset | Atascosa | 7 | 958 | 21 | Jan 1993 – May 1998 |
| Cooper -Y- O-1-10989 | Great Plains Resources, Inc. | Somerset | Atascosa | 7 | 901 | 21 | Jan 1993 – May 1998 |
| Ricks, E. et Al O-1-10808 | Great Plains Resources, Inc. | Somerset | Atascosa | 6 | 880 | 17 | Jan 1993 – May 1998 |
| Nichols, Lucy -A- O-1-10875 | Great Plains Resources, Inc. | Somerset | Atascosa | 6 | 784 | 26 | Jan 1993 – Jan 1998 |
| Smothers-Gonzales O-1-10911 | Great Plains Resources, Inc. | Somerset | Atascosa | 6 | 772 | 22 | Jan 1993 – Oct 1997 |
| Cooper -O- O-1-11366 | Great Plains Resources, Inc. | Somerset | Atascosa | 3 | 743 | 26 | Jan 1993 – May 1998 |
| Cooper -N- O-1-11364 | Great Plains Resources, Inc. | Somerset | Atascosa | 4 | 720 | 26 | Jan 1993 – May 1998 |
| Thompson-Nichols O-1-8261 | Great Plains Resources, Inc. | Somerset | Atascosa | 4 | 705 | 19 | Jan 1993 – Jan 1998 |
| Cooper -I- O-1-11131 | Great Plains Resources, Inc. | Somerset | Atascosa | 5 | 692 | 24 | Jan 1993 – May 1998 |
| Trimmer O-1-10744 | Great Plains Resources, Inc. | Somerset | Atascosa | 6 | 667 | 26 | Jan 1993 – Jan 1996 |
| May, D.C. O-1-10919 | Great Plains Resources, Inc. | Somerset | Atascosa | 6 | 554 | 20 | Jan 1993 – Apr 1998 |
| Prater, Joseph O-1-11278 | Great Plains Resources, Inc. | Somerset | Atascosa | 4 | 530 | 23 | Jan 1993 – Dec 1996 |
| Nichols, Lucy O-1-10874 | Great Plains Resources, Inc. | Somerset | Atascosa | 2 | 509 | 26 | Jan 1993 – Oct 1997 |
| Hernandez, I.G. O-1-10863 | Great Plains Resources, Inc. | Somerset | Atascosa | 11 | 485 | 25 | Jan 1993 – Nov 1995 |
| Cooper -Z- O-1-11363 | Great Plains Resources, Inc. | Somerset | Atascosa | 4 | 463 | 21 | Jan 1993 – May 1998 |
| Fowler, Ima et Al O-1-10807 | Great Plains Resources, Inc. | Somerset | Atascosa | 14 | 438 | 18 | Jan 1993 – Jan 1996 |
| Cooper Unit O-1-6418 | Great Plains Resources, Inc. | Somerset | Atascosa | 6 | 350 | 13 | Jan 1993 – May 1998 |
| Pickens, John Z. III O-1-6472 | Great Plains Resources, Inc. | Somerset | Atascosa | 1 | 331 | 18 | Jan 1993 – Apr 1997 |
| Hughes, R. T. -A- O-1-1626 | Great Plains Resources, Inc. | Somerset | Atascosa | 19 | 326 | 14 | Apr 1993 – May 1998 |
| Miller, M. O-1-1636 | Great Plains Resources, Inc. | Somerset | Atascosa | 24 | 324 | 16 | Mar 1993 – May 1998 |
| Stubblefield, D.C. O-1-11091 | Great Plains Resources, Inc. | Somerset | Atascosa | 2 | 300 | 15 | Jan 1993 – Nov 1997 |
| Fowler, Ima -B- O-1-6459 | Great Plains Resources, Inc. | Somerset | Atascosa | 1 | 297 | 21 | Jan 1993 – Apr 1997 |
| Fowler, Ima 'A' O-1-6458 | Great Plains Resources, Inc. | Somerset | Atascosa | 1 | 283 | 17 | Mar 1993 – Jan 1997 |
| Cooper -P-2 O-1-11537 | Great Plains Resources, Inc. | Somerset | Atascosa | 2 | 250 | 25 | Jan 1993 – May 1998 |
| Pickens, Stage -D- O-1-11076 | Great Plains Resources, Inc. | Somerset | Atascosa | 11 | 237 | 7 | Aug 1993 – May 1998 |
| Stubblefield O-1-10809 | Great Plains Resources, Inc. | Somerset | Atascosa | 1 | 215 | 14 | Jan 1993 – Dec 1997 |
| Cooper -A- O-1-11671 | Great Plains Resources, Inc. | Somerset | Atascosa | 2 | 201 | 12 | Jan 1993 – May 1998 |
| Quesada O-1-11042 | Great Plains Resources, Inc. | Somerset | Atascosa | 9 | 171 | 12 | Jan 1993 – Dec 1997 |
| Eastwood -A- O-1-11794 | Great Plains Resources, Inc. | Somerset | Atascosa | 2 | 167 | 12 | Jan 1993 – Oct 1995 |
| Nichols, L. O-1-1637 | Great Plains Resources, Inc. | Somerset | Atascosa | 4 | 156 | 10 | Aug 1993 – Jan 1996 |
| Cooper -P-3 O-1-11538 | Great Plains Resources, Inc. | Somerset | Atascosa | 2 | 144 | 25 | Jan 1993 – May 1998 |
| Pickens, Stage -E- O-1-11077 | Great Plains Resources, Inc. | Somerset | Atascosa | 5 | 130 | 7 | Aug 1993 – May 1998 |
| Langley Hrs. O-1-1634 | Great Plains Resources, Inc. | Somerset | Atascosa | 7 | 110 | 16 | May 1993 – May 1998 |
| Nichols -B- O-1-10782 | Great Plains Resources, Inc. | Somerset | Atascosa | 3 | 109 | 12 | Jan 1993 – Nov 1997 |
| Ricks, S. E. O-1-1640 | Great Plains Resources, Inc. | Somerset | Atascosa | 3 | 93 | 16 | Jan 1993 – Dec 1997 |
| Langley, A. G. O-1-1633 | Great Plains Resources, Inc. | Somerset | Atascosa | 4 | 80 | 7 | May 1993 – May 1998 |
| Little, Jesse A. O-1-6419 | Great Plains Resources, Inc. | Somerset | Atascosa | 2 | 42 | 11 | Jan 1993 – Sep 1995 |
| Buchsenschutz, R. -A- O-1-10806 | Great Plains Resources, Inc. | Somerset | Atascosa | 1 | 42 | 5 | Jan 1993 – Nov 1995 |
| Cooper W O-1-11807 | Great Plains Resources, Inc. | Somerset | Atascosa | 2 | 41 | 0 | Jun 1995 – May 1998 |
| Cooper -M- O-1-11341 | Great Plains Resources, Inc. | Somerset | Atascosa | 1 | 41 | 23 | Jan 1993 – Oct 1995 |
| Quesada -A- O-1-10945 | Great Plains Resources, Inc. | Somerset | Atascosa | 3 | 39 | 8 | Jan 1993 – Dec 1996 |