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| Lease Name | Location | Operator | Oil Prod | Gas Prod |
|---|---|---|---|---|
| Mackie 1-19H | Richland County, MT | Continental Resources Inc | ||
| Macum Alberi-Croft 32-32 | Carbon County, MT | Big Sky Energy, LLC | ||
| Macum Federal 22-28 | Blaine County, MT | Kykuit Resources, LLC | ||
| Maddux-Kirkpatrick | Toole County, MT | Montalban Oil & Gas Operations, Inc. | ||
| Magda (23-24) | Blaine County, MT | Klabzuba Oil & Gas, Inc. | ||
| Magda 15-1-24-18C | Blaine County, MT | NorthWestern Corporation | ||
| Mahlen 24-32H | Richland County, MT | Whiting Oil and Gas Corporation | ||
| Mahoney 16-22 | Liberty County, MT | MCR, LLC | ||
| Mahoney B (3,6,7,13-23) | Liberty County, MT | Woods, Pete Or Maxine | ||
| Mahoney B-2 | Liberty County, MT | MCR, LLC | ||
| Mahoney C. (2,4,5) | Liberty County, MT | MCR, LLC | ||
| Mahoney, E -A- | Liberty County, MT | MCR, LLC | ||
| Majerus #1 8-19 | Pondera County, MT | PT Energy, LLC | ||
| Majerus 1-6 | Hill County, MT | Devon Energy Production Co., LP | ||
| Majerus 17-34-17C | Hill County, MT | Brown, J. Burns Operating Company | ||
| Maley-Holmes (#1) | Toole County, MT | New Horizon Resources LLC | ||
| Maliszewski(1) | Glacier County, MT | Glacier Minerals, LLC | ||
| Malone | Toole County, MT | Ranck Oil Company, Inc. | ||
| Malone 2-10 | Toole County, MT | A. B. Energy LLC | ||
| Malone 2-15 | Toole County, MT | A. B. Energy LLC | ||
| Malone 3-10 | Toole County, MT | A. B. Energy LLC | ||
| Malone 3-15 | Toole County, MT | A. B. Energy LLC | ||
| Malone State | Toole County, MT | Ballantyne Ventures LLC | ||
| Maloney | Toole County, MT | Somont Oil Company, Inc. | ||
| Malsam | Richland County, MT | Whiting Oil and Gas Corporation | ||
| Malsam 21-33-20B | Blaine County, MT | NorthWestern Corporation | ||
| Malsam 21-34-20B | Blaine County, MT | Brown, J. Burns Operating Company | ||
| Malsam 27-33-20-4 | Blaine County, MT | NorthWestern Corporation | ||
| Malsam 27-9-33-20B | Blaine County, MT | NorthWestern Corporation | ||
| Malsam-Federal 20-1-33-20B | Blaine County, MT | Klabzuba Oil & Gas, Inc. | ||
| Mancoronel | Pondera County, MT | Campanella, George L | ||
| Mancoronel #2 | Pondera County, MT | Petrox Petroleum Company | ||
| 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 | Kraken Operating, LLC | ||
| Mar.V.Ctry.CLB(Irvin 10) | Toole County, MT | T.W.O. (Taylor Well Operating) | ||
| 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 |