| 534721 | Jul 29, 2003 | Jul 29, 2003 | Mortimer Exploration Company | San Patricio | George #3 | 3,500 | 40932737 |
| 534721Amendment | Jul 29, 2003 | Jul 29, 2003 | Mortimer Exploration Company | San Patricio | George #3 | 3,500 | 40932737 |
| 534720 | Jul 29, 2003 | Jul 29, 2003 | Mortimer Exploration Company | San Patricio | Fowler Unit #3 | 3,500 | 40932736 |
| 534719 | Jul 29, 2003 | Jul 29, 2003 | Mortimer Exploration Company | Trinity | Temple Industries #1 | 15,500 | 45530007 |
| 532260 | Jun 3, 2003 | Jun 3, 2003 | Mortimer Exploration Company | San Patricio | Jostes #4 | 4,500 | 40932719 |
| 532377 | May 29, 2003 | May 29, 2003 | Mortimer Exploration Company | Wilson | Rakowitz #1 | 1,600 | 49332514 |
| 531150 | Apr 30, 2003 | Apr 30, 2003 | Mortimer Exploration Company | San Patricio | Fowler #2 | 5,600 | 40932698 |
| 531144 | Apr 30, 2003 | Apr 30, 2003 | Mortimer Exploration Company | Bastrop | Fuchs - Oeser Unit #1 | 7,200 | 02131558 |
| 527454 | Jan 17, 2003 | Jan 17, 2003 | Mortimer Exploration Company | Hidalgo | Sal del Rey #1A | 9,400 | 21533068 |
| 524735 | Oct 18, 2002 | Oct 18, 2002 | Mortimer Exploration Company | San Patricio | Jostes #4 | 4,500 | 40932719 |
| 524735Amendment | Oct 18, 2002 | Oct 18, 2002 | Mortimer Exploration Company | San Patricio | Jostes #4 | 4,500 | 40932719 |
| 518747 | Apr 2, 2002 | Apr 2, 2002 | Mortimer Exploration Company | San Patricio | Fowler #2 | 5,600 | 40932698 |
| 518747Amendment | Apr 2, 2002 | Apr 2, 2002 | Mortimer Exploration Company | San Patricio | Fowler #2 | 5,600 | 40932698 |
| 510615 | Jun 22, 2001 | Jun 22, 2001 | Mortimer Exploration Company | Starr | Wood/Wardner #1 | 7,000 | 42733383 |
| 510615Amendment | Jun 22, 2001 | Jun 22, 2001 | Mortimer Exploration Company | Starr | Wood/Wardner #1 | 7,000 | 42733383 |
| 510614 | Jun 22, 2001 | Jun 22, 2001 | Mortimer Exploration Company | Starr | Walker, Billy L. #4 | 6,000 | 42733384 |
| 508664 | May 8, 2001 | May 8, 2001 | Mortimer Exploration Company | San Patricio | Flinn #2 | 5,800 | 40932676 |
| 508664Amendment | May 8, 2001 | May 8, 2001 | Mortimer Exploration Company | San Patricio | Flinn #2 | 5,800 | 40932676 |
| 501706 | Nov 7, 2000 | Nov 7, 2000 | Mortimer Exploration Company | Wilson | Gussie Pundt #1 | 1,600 | 49332497 |
| 497451 | Jul 21, 2000 | Jul 21, 2000 | Mortimer Exploration Company | Starr | Margo/Pena #3 | 6,000 | 42733249 |
| 497451Amendment | Jul 21, 2000 | Jul 21, 2000 | Mortimer Exploration Company | Starr | Margo/Pena #3 | 6,000 | 42733249 |
| 497298 | Jul 18, 2000 | Jul 18, 2000 | Mortimer Exploration Company | San Patricio | Jostes #2 | 4,400 | 40932100 |
| 491762 | Feb 14, 2000 | Feb 14, 2000 | Mortimer Exploration Company | Hartley | Walker Ranch #2045H | 6,600 | 20530273 |
| 480566 | Oct 30, 1998 | Oct 30, 1998 | Mortimer Exploration Company | Childress | Jouett Unit #1 | 4,800 | 07530156 |
| 479651 | Sep 25, 1998 | Sep 25, 1998 | Mortimer Exploration Company | Hartley | Reynolds Cattle Co. #1 | 7,000 | 20530134 |
| 474893 | Apr 1, 1998 | Apr 1, 1998 | Mortimer Exploration Company | Starr | Ricaby #1 | 6,000 | 42733101 |
| 472548 | Jan 23, 1998 | Jan 23, 1998 | Mortimer Exploration Company | Hartley | Walker Ranch #2036 | 6,600 | 20530289 |
| 472548Amendment | Jan 23, 1998 | Jan 23, 1998 | Mortimer Exploration Company | Hartley | Walker Ranch #2036 | 6,600 | 20530289 |
| 468234 | Oct 1, 1997 | Oct 1, 1997 | Mortimer Exploration Company | Hartley | Walker Ranch #136 | 6,600 | 20530286 |
| 468234Amendment | Oct 1, 1997 | Oct 1, 1997 | Mortimer Exploration Company | Hartley | Walker Ranch #1036 | 6,600 | 20530286 |
| 462653 | May 20, 1997 | May 20, 1997 | Mortimer Exploration Company | Childress | Wilcoxson #1 | 5,000 | 07530154 |
| 462652 | May 20, 1997 | May 20, 1997 | Mortimer Exploration Company | Childress | Dowlen #1 | 5,000 | 07530153 |
| 458008 | Feb 3, 1997 | Feb 3, 1997 | Mortimer Exploration Company | Hartley | Walker Ranch #3045 | 6,600 | 20530277 |
| 454223 | Oct 24, 1996 | Oct 24, 1996 | Mortimer Exploration Company | Young | King/Rosebrough #1 | 3,600 | 50340786 |
| 454051 | Oct 18, 1996 | Oct 18, 1996 | Mortimer Exploration Company | Young | McClatchey-Taack #1 | 4,999 | 50340747 |
| 453215 | Sep 27, 1996 | Sep 27, 1996 | Mortimer Exploration Company | Hartley | Walker Ranch #1 | 6,500 | 20530266 |
| 449207 | Jun 14, 1996 | Jun 14, 1996 | Mortimer Exploration Company | Young | Jean Oil Unit #1 | 4,999 | 50340686 |
| 447594 | Apr 30, 1996 | Apr 30, 1996 | Mortimer Exploration Company | Young | McClatchy/ Taack Oil Unit #1 | 4,999 | 50340747 |
| 447594Amendment | Apr 30, 1996 | Apr 30, 1996 | Mortimer Exploration Company | Young | McClatchy/ Taack Oil Unit #1 | 4,999 | 50340747 |
| 447338 | Apr 22, 1996 | Apr 22, 1996 | Mortimer Exploration Company | Webb | South Biel #1 | 1,200 | 47936485 |
| 446638 | Apr 4, 1996 | Apr 4, 1996 | Mortimer Exploration Company | Hartley | Walker Ranch #2 | 6,600 | 20530273 |
| 440480 | Oct 3, 1995 | Oct 3, 1995 | Mortimer Exploration Company | Young | Jean Oil Unit #1 | 4,999 | 50340686 |
| 439121 | Aug 21, 1995 | Aug 21, 1995 | Mortimer Exploration Company | Hartley | Walker Ranch #1 | 6,500 | 20530266 |
| 429184 | Oct 19, 1994 | Oct 19, 1994 | Mortimer Exploration Company | San Patricio | Winsauer #1 | 3,487 | 40932402 |
| 428901 | Oct 12, 1994 | Oct 12, 1994 | Mortimer Exploration Company | Starr | Walker, Billy L. #2 | 6,100 | 42732707 |
| 426449 | Jul 29, 1994 | Jul 29, 1994 | Mortimer Exploration Company | Shackelford | Ledbetter #2A | 4,600 | 41737847 |
| 426447 | Jul 29, 1994 | Jul 29, 1994 | Mortimer Exploration Company | Starr | Guerra #2 | 6,000 | 42732692 |
| 424736 | Jun 9, 1994 | Jun 9, 1994 | Mortimer Exploration Company | Starr | Block/Guerra #6 | 6,000 | 42732682 |
| 424736Amendment | Jun 9, 1994 | Jun 9, 1994 | Mortimer Exploration Company | Starr | R.G. Smith Gas Unit #6 | 6,000 | 42732682 |
| 422328 | Apr 29, 1994 | Apr 29, 1994 | Mortimer Exploration Company | San Patricio | Winsauer #1 | 4,212 | 40932402 |
| 423026 | Apr 14, 1994 | Apr 14, 1994 | Mortimer Exploration Company | Starr | Walker, Billy L. #3 | 6,100 | 42732673 |
| 422947 | Apr 12, 1994 | Apr 12, 1994 | Mortimer Exploration Company | Duval | Labbe #1 | 2,600 | 13137936 |
| 421381 | Feb 22, 1994 | Feb 22, 1994 | Mortimer Exploration Company | Duval | Labbe #21 | 2,600 | 13131226 |
| 415442 | Sep 1, 1993 | Sep 1, 1993 | Mortimer Exploration Company | Zavala | Oppenheimer #1 | 2,850 | 50732462 |
| 414150 | Jul 22, 1993 | Jul 22, 1993 | Mortimer Exploration Company | Brooks | Mestena #3 | 2,000 | 04731642 |
| 410704 | Apr 13, 1993 | Apr 13, 1993 | Mortimer Exploration Company | Brooks | Mestena #2 | 2,000 | 04731637 |
| 408583 | Jan 29, 1993 | Jan 29, 1993 | Mortimer Exploration Company | Brooks | Mestena #1 | 8,800 | 04731630 |
| 408583Amendment | Jan 29, 1993 | Jan 29, 1993 | Mortimer Exploration Company | Brooks | Mestina #1 | 7,500 | 04731630 |
| 402934 | Aug 31, 1992 | Aug 31, 1992 | Mortimer Exploration Company | Zavala | Oppenheimer #1 | 2,850 | 50732462 |
| 402934Amendment | Aug 31, 1992 | Aug 31, 1992 | Mortimer Exploration Company | Zavala | Oppenheimer #1 | 2,850 | 50732462 |
| 398847 | May 6, 1992 | May 6, 1992 | Mortimer Exploration Company | Houston | Crockett, Davy #1 | 1,700 | 22530858 |
| 397871 | Mar 27, 1992 | Mar 27, 1992 | Mortimer Exploration Company | Shackelford | Ledbetter #1 A | 4,600 | 41737579 |
| 397871Amendment | Mar 27, 1992 | Mar 27, 1992 | Mortimer Exploration Company | Shackelford | Ledbetter #1 A | 4,600 | 41737579 |
| 396612 | Feb 13, 1992 | Feb 13, 1992 | Mortimer Exploration Company | Tom Green | Denis #1 | 5,000 | 45132123 |
| 394604 | Dec 10, 1991 | Dec 10, 1991 | Mortimer Exploration Company | Stonewall | Swenson Cattle Co. #1 | 3,700 | 43332760 |
| 388381 | May 29, 1991 | May 29, 1991 | Mortimer Exploration Company | Tom Green | Holik #3 | 5,000 | 45132065 |
| 386421 | Apr 18, 1991 | Apr 18, 1991 | Mortimer Exploration Company | Starr | Groos National Bank #2 | 1,550 | 42732275 |
| 384566 | Feb 15, 1991 | Feb 15, 1991 | Mortimer Exploration Company | Goliad | Berger #1 | 4,000 | 17532400 |
| 383380 | Jan 16, 1991 | Jan 16, 1991 | Mortimer Exploration Company | Tom Green | Holik #2 | 5,000 | 45132053 |
| 375737 | Jul 24, 1990 | Jul 24, 1990 | Mortimer Exploration Company | Starr | Breaker #2 | 2,000 | 42732429 |
| 375737Amendment | Jul 24, 1990 | Jul 24, 1990 | Mortimer Exploration Company | Starr | Breaker #2 | 2,000 | 42732429 |
| 375737Amendment | Jul 24, 1990 | Jul 24, 1990 | Mortimer Exploration Company | Starr | Breaker #2 | 2,000 | 42732429 |
| 374512 | Jun 14, 1990 | Jun 14, 1990 | Mortimer Exploration Company | Tom Green | Holik #1 | 5,000 | 45132027 |
| 367048 | Nov 29, 1989 | Nov 29, 1989 | Mortimer Exploration Company | San Patricio | Corpus Christi Bank & Trust #1 | 6,900 | 40932271 |
| 365586 | Oct 24, 1989 | Oct 24, 1989 | Mortimer Exploration Company | Starr | Margo/Pena #2 | 6,000 | 42732370 |
| 365586Amendment | Oct 24, 1989 | Oct 24, 1989 | Mortimer Exploration Company | Starr | Margo/Pena #2 | 6,000 | 42732370 |
| 365585 | Oct 24, 1989 | Oct 24, 1989 | Mortimer Exploration Company | Starr | Garcia, M.M. #1 | 5,000 | 42732369 |
| 362796 | Aug 17, 1989 | Aug 17, 1989 | Mortimer Exploration Company | Jackson | Kightlinger #1 | 7,300 | 23932509 |
| 355388 | Jan 24, 1989 | Jan 24, 1989 | Mortimer Exploration Company | Jackson | Finley, Dee #1 | 7,300 | 23932409 |
| 353844 | Dec 8, 1988 | Dec 8, 1988 | Mortimer Exploration Company | Starr | Wood/Guerra #1 | 6,000 | 42732315 |
| 353821 | Dec 1, 1988 | Dec 1, 1988 | Mortimer Exploration Company | Aransas | Gabriel #1 | 9,600 | 00730783 |
| 353820 | Dec 1, 1988 | Dec 1, 1988 | Mortimer Exploration Company | Starr | Parks/Hickman #1 | 6,000 | 42732314 |
| 351773 | Sep 29, 1988 | Sep 29, 1988 | Mortimer Exploration Company | San Patricio | Corpus Christi Bank & Trust #1 | 6,900 | 40932271 |
| 349421 | Jul 29, 1988 | Jul 29, 1988 | Mortimer Exploration Company | Jackson | Finley, Dee "A" #4 | 7,252 | 23932091 |
| 347958 | Jun 22, 1988 | Jun 22, 1988 | Mortimer Exploration Company | Starr | Zarsky #1 | 2,000 | 42732274 |
| 347960 | Jun 21, 1988 | Jun 21, 1988 | Mortimer Exploration Company | Starr | Groos National Bank #2 | 2,000 | 42732275 |
| 347277 | Jun 1, 1988 | Jun 1, 1988 | Mortimer Exploration Company | Webb | Benavides #1 | 6,300 | 47934696 |
| 346339 | May 12, 1988 | May 12, 1988 | Mortimer Exploration Company | Jackson | Finley, Dee #1 | 7,300 | 23932409 |
| 342543 | Feb 16, 1988 | Feb 16, 1988 | Mortimer Exploration Company | Starr | Groos Nat'l. Bank #1 | 6,100 | 42732241 |
| 339957 | Dec 10, 1987 | Dec 10, 1987 | Mortimer Exploration Company | Jim Hogg | Ramirez #1 | 7,500 | 24731807 |
| 339957Amendment | Dec 10, 1987 | Dec 10, 1987 | Mortimer Exploration Company | Jim Hogg | Ramirez #1 | 7,500 | 24731807 |
| 337241 | Oct 13, 1987 | Oct 13, 1987 | Mortimer Exploration Company | Starr | Breaker #1 | 2,000 | 42732224 |
| 335641 | Sep 10, 1987 | Sep 10, 1987 | Mortimer Exploration Company | Starr | Guerra #1 | 6,100 | 42732215 |
| 331977 | Aug 6, 1987 | Aug 6, 1987 | Mortimer Exploration Company | Smith | Cline #2 | 9,000 | 42331115 |
| 329405 | Apr 30, 1987 | Apr 30, 1987 | Mortimer Exploration Company | Karnes | Kyselica #1 | 4,100 | 25531173 |
| 329406 | Apr 27, 1987 | Apr 27, 1987 | Mortimer Exploration Company | Karnes | Nichols, Dwight #1 | 4,100 | 25531172 |
| 327060 | Feb 25, 1987 | Feb 25, 1987 | Mortimer Exploration Company | Starr | Block/Guerra #2 | 6,000 | 42732175 |
| 326662 | Feb 17, 1987 | Feb 17, 1987 | Mortimer Exploration Company | Starr | Ringgold Farms #2 | 5,978 | 42732171 |
| 326662Amendment | Feb 17, 1987 | Feb 17, 1987 | Mortimer Exploration Company | Starr | Ringgold Farms #2 | 5,978 | 42732171 |
| 324938 | Dec 30, 1986 | Dec 30, 1986 | Mortimer Exploration Company | Cherokee | Monkress, Harold #1 | 10,000 | 07330720 |