| Hereford -T- G-4-168181 | Bashara-Hereford (7300) | Webb | 1 | 29.2K | 4.81M | Apr 1998 – Dec 2005 | Merit Energy Company |
| Hereford, L. M. G-4-191663 | Laredo (Lobo) | Webb | 1 | 23.6K | 1.49M | Sep 2002 – Dec 2005 | Merit Energy Company |
| Russell-Winch G-4-166302 | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 20.2K | 1.34M | Nov 1998 – Dec 2005 | Arete Operating Company, LLC |
| Webb County School Board G-4-87366 | Mancho Prado (L-1) | Webb | 1 | 19.6K | 1.1M | by Jan 1993 – Dec 2005 | Proline Energy Resources Inc |
| Russell - Winch G-4-196183 | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 19.6K | 956K | Jun 2003 – Dec 2005 | Arete Operating Company, LLC |
| Russell - Winch G-4-193163 | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 19.4K | 738K | Jan 2003 – Dec 2005 | Arete Operating Company, LLC |
| Haynes, L. G-4-202302 | Los Mogotes (Wilcox Cons.) | Zapata | 1 | 16.9K | 1.12M | Jun 2004 – Dec 2005 | Merit Energy Company |
| Haynes, L. G-4-197014 | Los Mogotes (Wilcox Cons.) | Zapata | 1 | 15.1K | 1.55M | Aug 2003 – Dec 2005 | Merit Energy Company |
| Hereford -T- G-4-169352 | Bashara-Hereford (7300) | Webb | 1 | 14.8K | 2.81M | May 1998 – Dec 2005 | Merit Energy Company |
| Webb County School Board G-4-151286 | Big Cowboy (Lobo) | Webb | 1 | 13.9K | 962K | Aug 1994 – Dec 2005 | off the schedule |
| Bruni Mineral Trust North TR "A" G-4-170306 | Valley (Navarro) | Webb | 1 | 13.6K | 7.49M | Dec 1998 – Dec 2005 | Lakeshore Operating, LLC |
| Haynes, L. G-4-194408 | Los Mogotes (Wilcox Cons.) | Zapata | 1 | 12.3K | 2.66M | Mar 2003 – Dec 2005 | Merit Energy Company |
| Russell-Winch G-4-151909 | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 10.6K | 1.33M | Nov 1998 – Dec 2005 | Arete Operating Company, LLC |
| Haynes, L. G-4-191691 | Los Mogotes (Wilcox Cons.) | Zapata | 1 | 9.39K | 2.4M | Nov 2002 – Dec 2005 | Merit Energy Company |
| Webb County School Board G-4-109792 | Mancho Prado (L-1) | Webb | 1 | 9.11K | 1.57M | by Jan 1993 – Dec 2005 | off the schedule |
| Webb County School Board G-4-151412 | Big Cowboy (Lobo) | Webb | 1 | 8.03K | 1.15M | Oct 1994 – Dec 2005 | Proline Energy Resources Inc |
| Webb County School Board G-4-120751 | Big Cowboy (Lobo) | Webb | 1 | 7.98K | 655K | by Jan 1993 – Dec 2005 | off the schedule |
| Haynes, L. G-4-208219 | Los Mogotes (Wilcox Cons.) | Zapata | 1 | 6.54K | 712K | Nov 2004 – Dec 2005 | Merit Energy Company |
| Bruni Mineral Trust "C" G-4-192413 | Bashara-Hereford (7300) | Webb | 1 | 6.48K | 1.84M | Dec 2002 – Dec 2005 | Lakeshore Operating, LLC |
| Hereford -T- G-4-150205 | Bashara-Hereford (7300) | Webb | 1 | 6.43K | 1.96M | Jun 1996 – Dec 2005 | Merit Energy Company |
| Russell - Winch G-4-132796 | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 6.31K | 650K | Nov 1998 – Dec 2005 | Arete Operating Company, LLC |
| Webb County School Board G-4-191705 | Mancho Prado (L-1) | Webb | 1 | 5.98K | 372K | Nov 2002 – Dec 2005 | off the schedule |
| Haynes, L. G-4-199934 | Los Mogotes (Wilcox Cons.) | Zapata | 1 | 5.85K | 1.3M | Feb 2004 – Dec 2005 | Merit Energy Company |
| Hereford, L. M. G-4-171851 | Laredo (Lobo) | Webb | 1 | 5.75K | 1.92M | Dec 1998 – Dec 2005 | Merit Energy Company |
| Haynes, L. G-4-206495 | Los Mogotes (Wilcox Cons.) | Zapata | 1 | 5.46K | 1.03M | Nov 2004 – Dec 2005 | Merit Energy Company |
| Russell - Winch G-4-172477 | Belle Jeffers (7850) | Webb | 1 | 5.45K | 514K | Feb 1999 – Dec 2005 | Arete Operating Company II, LLC |
| Hereford, L.M. G-4-125962 | Bashara-Hereford (6900) | Webb | 1 | 5.38K | 1.15M | Jan 1995 – Dec 2005 | Merit Energy Company |
| Russell-Winch G-4-143764 | Belle Jeffers (7850) | Webb | 1 | 5.34K | 225K | Nov 1998 – Dec 2005 | Arete Operating Company, LLC |
| Hereford, L.M. G-4-130730 | Bashara-Hereford (7300) | Webb | 1 | 5.12K | 1.46M | Jan 1995 – Dec 2005 | Merit Energy Company |
| Haynes, L. G-4-207112 | Los Mogotes (Wilcox Cons.) | Zapata | 1 | 4.97K | 961K | Dec 2004 – Dec 2005 | Merit Energy Company |
| Haynes, Leonard G-4-179299 | Los Mogotes (Wilcox Cons.) | Zapata | 1 | 4.86K | 2.37M | Sep 2000 – Dec 2005 | Merit Energy Company |
| Hereford, L.M. G-4-132424 | Bashara-Hereford (7300) | Webb | 1 | 4.85K | 1.59M | Jan 1995 – Dec 2005 | Merit Energy Company |
| Russell-Winch G-4-120415 | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 4.4K | 260K | Nov 1998 – Dec 2005 | Arete Operating Company, LLC |
| Russell-Winch G-4-169843 | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 4.33K | 739K | Apr 1999 – Dec 2005 | Arete Operating Company, LLC |
| Winch, L.-State G-4-192926 | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 4.24K | 484K | Nov 2002 – Dec 2005 | Arete Operating Company, LLC |
| Hereford, L. M. G-4-64864 | Laredo (Lobo) | Webb | 1 | 4.01K | 1.64M | Jun 1996 – Dec 2005 | Merit Energy Company |
| Bruni Mineral Trust North TR "A" G-4-174751 | Valley (Navarro) | Webb | 1 | 3.88K | 2.53M | Oct 1999 – Dec 2005 | Lakeshore Operating, LLC |
| Hereford -T- G-4-170303 | Bashara-Hereford (7300) | Webb | 1 | 3.57K | 1.28M | Jul 1998 – Dec 2005 | Merit Energy Company |
| Russell - Winch State G-4-128572 | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 3.56K | 478K | Nov 1998 – Dec 2005 | Arete Operating Company, LLC |
| Haynes, L. G-4-192316 | Los Mogotes (Wilcox Cons.) | Zapata | 1 | 3.53K | 2.35M | Nov 2002 – Dec 2005 | Merit Energy Company |
| Hereford -T- G-4-60382 | Laredo (Lobo) | Webb | 1 | 3.44K | 1.25M | Jun 1996 – Dec 2005 | Merit Energy Company |
| Hereford, L.M. G-4-125035 | Bashara-Hereford (7300) | Webb | 1 | 3.43K | 1.33M | Jan 1995 – Dec 2005 | Merit Energy Company |
| Hereford, L. M. -A- G-4-151290 | Bashara-Hereford (7300) | Webb | 1 | 3.34K | 743K | Jan 1995 – Dec 2005 | Merit Energy Company |
| Hereford, L. M. -A- G-4-137904 | Bashara-Hereford (7300) | Webb | 1 | 3.14K | 1.25M | Jan 1995 – Dec 2005 | Merit Energy Company |
| Hereford, L. M. G-4-69483 | Laredo (Lobo) | Webb | 1 | 2.98K | 899K | Jan 1995 – Dec 2005 | Merit Energy Company |
| Hereford -T- G-4-65828 | Laredo (Lobo) | Webb | 1 | 2.95K | 1.4M | Jun 1996 – Dec 2005 | Merit Energy Company |
| L. Winch State G-4-100947 | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 2.93K | 276K | Nov 1998 – Dec 2005 | Arete Operating Company, LLC |
| Haynes, L. G-4-183479 | Los Mogotes (Wilcox Cons.) | Zapata | 1 | 2.87K | 367K | Jul 2001 – Dec 2005 | Merit Energy Company |
| Sob Min Fee G-4-155458 | Bashara-Hereford (7300) | Webb | 1 | 2.82K | 647K | Jun 1995 – Dec 2005 | Merit Energy Company |
| Haynes, L. G-4-205682 | Los Mogotes (Wilcox Cons.) | Zapata | 1 | 2.81K | 1.15M | Nov 2004 – Dec 2005 | Merit Energy Company |