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| Lease Name | Location | Operator | Oil Prod | Gas Prod |
|---|---|---|---|---|
| Mang (3-8,4-8,3-8a,4-8a) | Musselshell County, MT | Beartooth Oil & Gas Company | ||
| Mann | Big Horn County, MT | Diamond Oil & Gas LLC | ||
| Mann (#1) | Roosevelt County, MT | Darrah Oil Company, LLC | ||
| Manuel 12-15 | Hill County, MT | Devon Energy Production Co., LP | ||
| Manuel, Ted B | Fergus County, MT | Kykuit Resources, LLC | ||
| Manush 1-12H | Roosevelt County, MT | Oasis Petroleum North America LLC | ||
| Mar.V.Ctry.CLB(Irvin 10) | Toole County, MT | Big Rose Colony, Inc. | ||
| Marauder 1-19H | Roosevelt County, MT | Slawson Exploration Company Inc | ||
| Marcel 1-34-16 | Hill County, MT | NorthWestern Corporation | ||
| Margaret 44-15H | Richland County, MT | Continental Resources Inc | ||
| Margaret Souders | Carbon County, MT | Big Sky Energy, LLC | ||
| Marias 10-25 | Pondera County, MT | AltaMont Oil & Gas Inc. | ||
| Marie Kruger "A" | Glacier County, MT | New Horizon Resources LLC | ||
| Marie Kruger "B" | Glacier County, MT | New Horizon Resources LLC | ||
| Marie Standing Heirs (1) | Valley County, MT | A&S Mineral Development Company, LLC | ||
| Marilyn 2758 42-11H | Roosevelt County, MT | Oasis Petroleum North America LLC | ||
| Mark Allen 1-32H | Richland County, MT | MorningStar Operating LLC | ||
| Marker (20-33) | Richland County, MT | Alturas Energy LLC | ||
| Marker 34X-20 | Richland County, MT | MorningStar Operating LLC | ||
| Marla | Richland County, MT | Continental Resources Inc | ||
| Marla 1-35H | Richland County, MT | Continental Resources Inc | ||
| Marla 4-2H | Richland County, MT | Continental Resources Inc | ||
| Marla Ahsl | Richland County, MT | Continental Resources Inc | ||
| Marla-Hill 4hsu | Richland County, MT | Continental Resources Inc | ||
| Marlin 14-8H | Richland County, MT | White Rock Oil & Gas, LLC | ||
| Marlys 1-34H | Richland County, MT | Continental Resources Inc | ||
| Marmont 1-26 | Toole County, MT | Ranck Oil Company, Inc. | ||
| Marmont 11-21 | Toole County, MT | Keesun Corporation | ||
| Marmont 3 | Toole County, MT | Keesun Corporation | ||
| Marsh | Blaine County, MT | NorthWestern Corporation | ||
| Marsh 23-16 | Blaine County, MT | NorthWestern Corporation | ||
| Marsh 23-16B | Blaine County, MT | NorthWestern Corporation | ||
| Marsh 35-3 | Blaine County, MT | NorthWestern Corporation | ||
| Martin | Teton County, MT | King-Sherwood Oil | ||
| Martin (I-1R) | Richland County, MT | |||
| Martin 1-27H | Richland County, MT | Continental Resources Inc | ||
| Martin 4 | Toole County, MT | Somont Oil Company, Inc. | ||
| Martin/Government N 1/19 | Toole County, MT | Montalban Oil & Gas Operations, Inc. | ||
| Marvin 14B-26 | Richland County, MT | White Rock Oil & Gas, LLC | ||
| Marvin 2-11-14 | Richland County, MT | Kraken Operating, LLC | ||
| Mary Reed | Big Horn County, MT | Soap Creek Associates, Inc. | ||
| Mary Wilson 10-3H | Roosevelt County, MT | Oasis Petroleum North America LLC | ||
| Matador 1-13H | Richland County, MT | Slawson Exploration Company Inc | ||
| Matador Federal 2658 43-7H | Richland County, MT | Oasis Petroleum North America LLC | ||
| Mather Unit | Glacier County, MT | Montalban Oil & Gas Operations, Inc. | ||
| Mather Unit #4 | Glacier County, MT | Montalban Oil & Gas Operations, Inc. | ||
| Matthew 1-31H | Richland County, MT | MorningStar Operating LLC | ||
| Mattick Farm And Ranch 2 | Stillwater County, MT | Herco Exploration LLC | ||
| Mattingley 44-9 H | Roosevelt County, MT | Oasis Petroleum North America LLC | ||
| Maurer 17-14 | Chouteau County, MT | Mountain Pacific General Inc. |