| Schalk 57 #002B30-039-30640 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | PermittedGas | 6,035 | Apr 1, 2009 | 0 | 0 |
| Schalk 57 #20030-039-30653 | Schalk Development Co | Rio ArribaBasin Fruitland Coal (Gas) | CanceledGas | 3,510 | Mar 9, 2009 | 0 | 0 |
| Schalk 57 #200S30-039-30654 | Schalk Development Co | Rio ArribaBasin Fruitland Coal (Gas) | CanceledGas | 3,410 | Mar 9, 2009 | 0 | 0 |
| Schalk 55 #200S30-039-30537 | Schalk Development Co | Rio ArribaBasin Fruitland Coal (Gas) | ActiveGas | 3,325 | Oct 22, 2008 | 0 | 114 |
| Schalk 55 #20030-039-30018 | Schalk Development Co | Rio ArribaBasin Fruitland Coal (Gas) | ActiveGas | 3,321 | Mar 22, 2007 | 0 | 50 |
| Schalk 55 #002B30-039-30019 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | ActiveGas | 5,878 | Mar 22, 2007 | 0 | 19,362 |
| Schalk 54 #20030-039-27621 | Schalk Development Co | Rio ArribaBasin Fruitland Coal (Gas) | ActiveGas | 3,399 | Jun 1, 2004 | 0 | 0 |
| Schalk 54 #200S30-039-27622 | Schalk Development Co | Rio ArribaBasin Fruitland Coal (Gas) | PluggedGas | 3,391 | Jun 1, 2004 | 0 | 0 |
| Schalk 55 #002A30-039-26739 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | ActiveGas | 5,944 | Dec 5, 2001 | 0 | 40,780 |
| Schalk 57 #002B30-039-26755 | Schalk Development Co | Rio Arriba | CanceledGas | 6,035 | Dec 5, 2001 | 0 | 0 |
| Schalk 52 #006A30-039-26756 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | ActiveGas | 5,996 | Dec 5, 2001 | 0 | 10,443 |
| Schalk 41 #001B30-039-26440 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | ActiveGas | 6,225 | May 1, 2000 | 30 | 12,499 |
| Schalk 41 #002B30-039-26441 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | ActiveGas | 6,103 | May 1, 2000 | 0 | 10,880 |
| Briny #00130-039-24374 | Schalk Development Co | Rio ArribaLindrith Gallup-Dakota,west | ActiveOil | 8,139 | Mar 17, 1989 | 0 | 414 |
| Schalk Myers #00130-039-24060 | Schalk Development Co | Rio ArribaLindrith Gallup-Dakota,west | ActiveOil | 8,091 | Aug 22, 1986 | 254 | 6,343 |
| Schalk Gavilan #00130-039-23881 | Schalk Development Co | Rio ArribaLindrith Gallup-Dakota,west | ActiveOil | 8,236 | Oct 2, 1985 | 762 | 32,335 |
| Schalk Ojito #00130-039-23587 | Schalk Development Co | Rio ArribaLindrith Gallup-Dakota,west | ActiveOil | 8,150 | Oct 9, 1984 | 672 | 11,989 |
| Schalk 94 #002A30-045-25279 | Schalk Development Co | San JuanBlanco-Mesaverde (Prorated Gas) | ActiveGas | 6,234 | Dec 14, 1981 | 0 | 11,564 |
| Johnson Gas Com D #001E30-045-25265 | Schalk Development Co | San JuanBasin Dakota (Prorated Gas) | ActiveGas | 6,715 | Dec 4, 1981 | 0 | 5,495 |
| Fullerton #001E30-045-25247 | Schalk Development Co | San JuanBasin Dakota (Prorated Gas) | ActiveGas | 6,359 | Nov 25, 1981 | 6 | 7,024 |
| Schalk 94 #00430-045-25181 | Schalk Development Co | San JuanBlanco-Mesaverde (Prorated Gas) | PluggedGas | 6,390 | Sep 10, 1981 | 0 | 0 |
| Schalk 94 #004A30-045-25183 | Schalk Development Co | San JuanBlanco-Mesaverde (Prorated Gas) | ActiveGas | 6,310 | Sep 10, 1981 | 0 | 14,394 |
| Schalk 57 #001E30-039-22540 | Schalk Development Co | Rio ArribaBasin Dakota (Prorated Gas) | PluggedGas | 8,370 | Nov 6, 1980 | 0 | 0 |
| Schalk 57 #002A30-039-22541 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | ActiveGas | 6,025 | Nov 6, 1980 | 0 | 2,164 |
| Schalk 54 #002A30-039-22517 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | PluggedGas | 6,050 | Oct 3, 1980 | 0 | 0 |
| Schalk 54 #001E30-039-22518 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | PluggedGas | 8,253 | Oct 3, 1980 | 0 | 0 |
| Schalk Gulf #00330-039-22390 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | ActiveGas | 6,300 | Jun 6, 1980 | 0 | 1,553 |
| Schalk Gulf #00230-039-22351 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | ActiveGas | 6,282 | May 22, 1980 | 9 | 232 |
| Schalk 41 #002A30-039-22127 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | ActiveGas | 6,162 | Jul 31, 1979 | 0 | 1,133 |
| Schalk 41 #00230-039-21953 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | ActiveGas | 6,014 | Oct 20, 1978 | 7 | 6,601 |
| Schalk 41 #00130-039-21954 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | ActiveGas | 6,207 | Oct 20, 1978 | 0 | 374 |
| Schalk 41 #001A30-039-21955 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | ActiveGas | 6,225 | Oct 20, 1978 | 0 | 0 |
| Schalk 29-4 #01730-039-21743 | Schalk Development Co | Rio ArribaChoza Mesa Pictured Cliffs (Gas) | ActiveGas | 4,100 | Apr 21, 1978 | 0 | 0 |
| Schalk 29-4 #01430-039-21744 | Schalk Development Co | Rio ArribaChoza Mesa Pictured Cliffs (Gas) | ActiveGas | 4,560 | Apr 21, 1978 | 0 | 0 |
| Schalk 29-4 #00730-039-21620 | Schalk Development Co | Rio ArribaChoza Mesa Pictured Cliffs (Gas) | ActiveGas | 4,360 | Jan 19, 1978 | 0 | 9,721 |
| Schalk 29-4 #00530-039-21137 | Schalk Development Co | Rio ArribaGobernador Pictured Cliffs (Gas) | ActiveGas | 4,375 | Sep 3, 1975 | 0 | 0 |
| Schalk 29-4 #00430-039-21139 | Schalk Development Co | Rio ArribaGobernador Pictured Cliffs (Gas) | ActiveGas | 4,488 | Sep 3, 1975 | 0 | 0 |
| Schalk 29-4 #00230-039-21140 | Schalk Development Co | Rio ArribaGobernador Pictured Cliffs (Gas) | ActiveGas | 4,550 | Sep 3, 1975 | 0 | 8,541 |
| Schalk 29-4 #00130-039-21057 | Schalk Development Co | Rio ArribaGobernador Pictured Cliffs (Gas) | ActiveGas | 8,949 | Jan 27, 1975 | 0 | 0 |
| Schalk 49 #00230-039-20720 | Schalk Development Co | Rio ArribaBlanco Pictured Cliffs, East (Gas) | PluggedGas | 4,500 | Nov 1, 1974 | 0 | 0 |
| Schalk 57 #00230-039-21024 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | PluggedGas | 6,100 | Sep 20, 1974 | 0 | 0 |
| Schalk 55 #00230-039-20998 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | ActiveGas | 5,975 | Aug 12, 1974 | 0 | 41,307 |
| Schalk 54 #00230-039-20928 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | PluggedGas | 5,957 | Jun 11, 1974 | 0 | 0 |
| Schalk 52 #00630-039-20929 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | ActiveGas | 5,795 | Jun 7, 1974 | 0 | 463 |
| Schalk 52 #00530-039-20808 | Schalk Development Co | Rio ArribaBlanco-Mesaverde (Prorated Gas) | ActiveGas | 5,823 | Jan 28, 1974 | 0 | 2,552 |
| Schalk 49 #00330-039-20802 | Schalk Development Co | Rio ArribaBlanco Pictured Cliffs, East (Gas) | PluggedGas | 4,450 | Dec 14, 1973 | 0 | 0 |
| Schalk 49 #00430-039-20803 | Schalk Development Co | Rio ArribaBlanco Pictured Cliffs, East (Gas) | ActiveGas | 4,200 | Dec 14, 1973 | 0 | 0 |
| Schalk 52 #00330-039-20799 | Schalk Development Co | Rio ArribaGobernador Pictured Cliffs (Gas) | ActiveGas | 3,630 | Dec 4, 1973 | 0 | 9,111 |
| Schalk 52 #00430-039-20800 | Schalk Development Co | Rio ArribaGobernador Pictured Cliffs (Gas) | ActiveGas | 3,640 | Dec 4, 1973 | 0 | 1,076 |
| Schalk 52 #00230-039-20798 | Schalk Development Co | Rio ArribaGobernador Pictured Cliffs (Gas) | ActiveGas | 3,667 | Nov 26, 1973 | 0 | 1,316 |