| Duval Ranch, Sec. #288 O-4-452 | McGowan Working Partners, Inc. only | Charamousca, South | Duval | 20 | 854K | 168K | Jan 1993 – Apr 2026 |
| Duval Ranch -59- O-4-1138 | Killam Oil Co., Ltd. only | Govt. Wells, South | Duval | 21 | 798K | 21 | Jan 1993 – Apr 2026 |
| Duval Ranch Sec. 62 O-4-2874 | Dewbre, Jerry C., Trustee only | Seventy-Six, West | Duval | 28 | 508K | 21 | Jan 1993 – Apr 2026 |
| Duval Ranch, Sec. # 257 a/C 1 O-4-1702 | Killam Oil Co., Ltd. only | Lundell (Pettus) | Duval | 6 | 477K | 19.1K | Jan 1993 – Jan 2026 |
| Magnolia-Duval Ranch Sec. 208-09 O-4-1083 | Killam Oil Co., Ltd. only | Govt. Wells, N. | Duval | 7 | 135K | 57 | Jan 1993 – Apr 2026 |
| Duval Ranch Sec. 203 O-4-8921 | Killam Oil Co., Ltd. only | Petrox, N. (Frio 1250) | Duval | 5 | 134K | 57 | Jan 1993 – Apr 2026 |
| Duval Ranch, Sec. #203 O-4-2114 | Killam Oil Co., Ltd. only | Piedre Lumbre | Duval | 14 | 115K | 69 | Jan 1993 – Apr 2026 |
| Duval Ranch, Sec. #201, a/C 2 O-4-2113 | Southwest Royalties, Inc. only | Piedre Lumbre | Duval | 2 | 91K | 21 | Jan 1993 – Apr 2017 |
| Humble-Duval Ranch Sec 204 O-4-11211 | Southwest Royalties, Inc. only | Petrox (Government Wells) | Duval | 4 | 89.2K | 34.3K | Jan 1993 – Jun 2006 |
| Duval Ranch, Sec. #58 O-4-1696 | Dewbre, Jerry C., Trustee only | Lundell | Duval | 9 | 88.9K | 21 | Jan 1993 – Apr 2026 |
| Duval Ranch -D- O-4-1093 | Hilcorp Energy Company only | Govt. Wells, N. | Duval | 4 | 87.6K | 152 | Jan 1993 – Feb 2026 |
| Duval Ranch Sec. 106 O-4-7897 | Killam Oil Co., Ltd. only | Hagist Ranch ( Argo) | Duval | 6 | 72.1K | 21 | Jan 1993 – Apr 2022 |
| Duval Ranch O-4-1089 | Ragars Oil & Gas Co. only | Govt. Wells, N. | Duval | 6 | 64.2K | 115K | Jan 1993 – Feb 2026 |
| Duval Ranch, Sec. #100, a/C 2 O-4-2112 | Dewbre, Jerry C., Trustee only | Piedre Lumbre | Duval | 6 | 57.2K | 21 | Jan 1993 – Mar 2015 |
| Duval Ranch 79 Cole -C- Unit O-4-7638 | Killam Oil Co., Ltd. only | D C R-79 | Duval | 13 | 53.6K | 15 | May 1993 – Apr 2026 |
| Duval Ranch Sec. 578 O-4-8767 | Killam Oil Co., Ltd. only | Sarnosa, West | Duval | 3 | 51.3K | 21 | Jan 1993 – Apr 2026 |
| Duval Ranch Section 281 O-4-8183 | McGowan Working Partners, Inc. only | Charamousca, South | Duval | 1 | 41.9K | 14.7K | Jan 1993 – Sep 2004 |
| Mag.duval Ranch Sec. 208-209 O-4-9194 | Killam Oil Co., Ltd. only | Govt. Wells, N. (1150) | Duval | 1 | 39.7K | 21 | Jan 1993 – Apr 2026 |
| Duval Ranch Sec. 106, Acct #3 O-4-4363 | Killam Oil Co., Ltd. only | Hagist Ranch ( Purple Sand) | Duval | 1 | 32.3K | 7 | Mar 1994 – Dec 2002 |
| Humble Duval Ranch Sec. 79 O-4-625 | Killam Oil Co., Ltd. only | D C R-79 | Duval | 6 | 16.4K | 7 | Mar 1994 – Apr 2025 |
| Duval Ranch Sec. 95 O-4-9057 | Killam Oil Co., Ltd. only | Piedre Lumbre (1300) | Duval | 1 | 14.9K | 21 | Jan 1993 – Mar 2008 |
| Duval Ranch Sec. 79 O-4-623 | Killam Oil Co., Ltd. only | D C R-79 | Duval | 1 | 14.7K | 7 | Mar 1994 – Apr 2026 |
| Duval Ranch Sec. 201 a/C #5 O-4-1189 | Southwest Royalties, Inc. only | Hagist Ranch ( Queen City Sand) | Duval | 2 | 14.7K | 21 | Jan 1993 – Feb 1999 |
| Duval Ranch Sec. 101 O-4-8894 | Killam Oil Co., Ltd. only | Brelum (Chernosky) | Duval | 3 | 8.58K | 21 | Jan 1993 – May 1996 |
| Duval Ranch Sec. 96 O-4-9908 | Southwest Royalties, Inc. only | Petrox (Chernosky, Upper) | Duval | 1 | 7.07K | 19 | Jan 1993 – Dec 2006 |
| Duval Ranch '79' O-4-14194 | Killam Oil Co., Ltd. only | D C R-79 | Duval | 1 | 3.6K | 0 | Jan 2023 – Apr 2026 |
| Duval Ranch Section 106 G-4-80542 | Killam Oil Co., Ltd. only | Piedre Lumbre (Wilcox) | Duval | 1 | 1.4K | 560K | Jan 1993 – Sep 2008 |
| Humble-Duval Ranch Sec. 79 a/C 2 O-4-4635 | Killam Oil Co., Ltd. only | Seventy-Six, South | Duval | 1 | 1.39K | 0 | May 1995 – Feb 2001 |
| Duval Ranch, Sec. #100, a/C 1 O-4-2111 | Dewbre, Jerry C., Trustee only | Piedre Lumbre | Duval | 2 | 1.28K | 0 | Jan 2011 – Mar 2015 |
| Duval Ranch Sec. 96 Unit G-4-12537 | Southwest Royalties, Inc. only | Piedre Lumbre (Wilcox) | Duval | 1 | 612 | 97.8K | Jan 1993 – Dec 1997 |
| Duval Ranch Sec. 96-B G-4-125587 | Southwest Royalties, Inc. only | Petrox (Frio 1200 -B-) | Duval | 1 | 8 | 138K | Jan 1993 – May 2017 |
| Duval Ranch Sec. 201 G-4-10180 | Southwest Royalties, Inc. only | Eagle Hill (Frio 800) | Duval | 1 | 7 | 84.9K | Jan 1993 – Apr 2017 |
| Duval Ranch Sec. 207 G-4-107252 | Southwest Royalties, Inc. only | Petrox, N. (Frio 1250) | Duval | 1 | 4 | 70.8K | Jan 1993 – Apr 2017 |
| Duval Ranch Sec. 208 G-4-148115 | Man-Gas Transmission Company only | Government Wells, N.(mirando UP) | Duval | 1 | 0 | 0 | — |
| Duval Ranch Sec. 208 G-4-148118 | Man-Gas Transmission Company only | Govt. Wells, N. (800 Sand) | Duval | 1 | 0 | 0 | — |
| Magnolia-Duval Ranch Sec. 208-09 G-4-259014 | Killam Oil Co., Ltd. only | Govt. Wells, N. (Cole,upper) | Duval | 1 | 0 | 0 | — |
| Duval Ranch Sec. 63-291 O-4-418 | Man-Gas Transmission Company only | Casa Blanca | Duval | 6 | 0 | 0 | — |
| Duval Ranch Sec. #132 O-4-440 | Manges, Clinton only | Cedro Hill | Duval | 16 | 0 | 0 | — |
| Duval Ranch Sec. 189 O-4-441 | Manges, Clinton only | Cedro Hill | Duval | 16 | 0 | 0 | — |
| Humble Duval Ranch Sec. 262 G-4-10098 | Duval County Ranch Co. only | D C R-79 | Duval | 1 | 0 | 0 | — |
| Duval Ranch Sec 96 G-4-121952 | Southwest Royalties, Inc. only | Petrox (Frio) | Duval | 1 | 0 | 21.8K | Apr 2004 – Nov 2012 |
| Duval Ranch Sec. 208 G-4-114893 | Killam Oil Co., Ltd. only | Government Wells, N.(mirando UP) | Duval | 1 | 0 | 0 | — |
| Duval Ranch Sec. 49 O-4-843 | Manges, Clinton only | Forty-Nine | Duval | 2 | 0 | 0 | — |
| Mag-Duval Ranch Sec. 208-209 G-4-104101 | Killam Oil Co., Ltd. only | Government Wells,n.(chernosky) | Duval | 1 | 0 | 0 | — |
| Mag. Duval Ranch Sec. 208-209 G-4-97949 | Killam Oil Co., Ltd. only | Government Wells, N.(mirando UP) | Duval | 1 | 0 | 0 | — |
| Duval Ranch Sec. 196 G-4-89857 | Duval County Ranch Co. only | Lopez, North (Lopez) | Duval | 1 | 0 | 0 | — |
| Mag. Duval Ranch Sec. 208-209 G-4-84353 | Killam Oil Co., Ltd. only | Govt. Wells, N. (800 Sand) | Duval | 1 | 0 | 0 | — |
| Duval Ranch Sec. 196 O-4-1656 | Killam Oil Co., Ltd. only | Lopez, North (Lopez) | Duval | 4 | 0 | 0 | — |
| Duval Ranch Sec. 106 G-4-83498 | Killam Oil Co., Ltd. only | Hagist Ranch ( 750) | Duval | 1 | 0 | 109K | Jan 1993 – Jan 2005 |
| Duval Ranch Sec. 257 G-4-81208 | Killam Oil Co., Ltd. only | Lundell (Cole) | Duval | 1 | 0 | 49.9K | Jan 1993 – Jan 2000 |