Heart Butte Field sits in Dunn County, North Dakota within the boundaries of the Fort Berthold Indian Reservation, home of the Mandan, Hidatsa, and Arikara Nation. It is core Bakken acreage, developed with horizontal Middle Bakken and Three Forks wells since roughly 2008. Ownership across the reservation is layered: much of the mineral estate is held in trust by the United States for the MHA Nation or for individual allottees, while other tracts are fee minerals owned outright. Those categories are treated very differently under the law.
Fort Berthold was already one of the most consequential landscapes in North Dakota before oil arrived. The Garrison Dam flooded the Missouri River bottomlands in the 1950s, taking the reservation’s most valuable agricultural land and forcing relocation of entire communities. That history shapes how land and mineral ownership on the reservation is recorded today, with allotted trust tracts, tribal trust tracts, and fee tracts interleaved across the same townships.
Bakken development reached the reservation in the late 2000s as horizontal drilling spread outward from the Mountrail County discoveries. Because a large share of the mineral estate is held in trust, leasing there runs through a different process than on fee land: the Bureau of Indian Affairs approves oil and gas leases on trust minerals, and the MHA Nation exercises authority over tribal minerals. The BIA Fort Berthold Agency has reported approving well over a thousand oil and gas leases.
Drilling in and around Heart Butte followed the same technical arc as the rest of the basin — single-well units and one-mile laterals early on, giving way to multi-well pads, two-mile laterals, and Three Forks development. Operators active on Fort Berthold have included several of the largest Bakken companies, and positions have moved through the consolidation of recent years. Royalty administration on trust interests remains distinct from fee royalty administration throughout.
Heart Butte sits in the productive core of the Williston Basin, with the Bakken petroleum system at roughly 10,000 feet in southern Dunn County. The Middle Bakken is a tight dolomitic siltstone bounded by the organic-rich Upper and Lower Bakken shales that sourced its oil, and the Three Forks Formation beneath contributes additional dolomite benches that drain as separate reservoirs. Neither will produce without long horizontal wellbores and multi-stage hydraulic fracturing to create the permeability the rock lacks naturally.
No injection program operates at Heart Butte. In the Bakken, additional recovery comes from more wellbores rather than injected fluid: infill wells, additional Three Forks benches, longer laterals, and refracturing of early completions. Recovery of the oil in place remains low by conventional standards, which is why development continues wherever inventory remains. The basin has seen gas injection pilots aimed at improving that number, but drilling is still the mechanism that adds barrels.
Ownership category matters more here than anywhere else in the basin. Trust and restricted interests — tribal minerals and allotted interests held in trust by the United States — are administered through the Bureau of Indian Affairs, carry statutory restrictions on alienation, and are not interests we purchase. Fee minerals inside the reservation boundary are ordinary private property and can be sold like any other. If you hold fee minerals, we buy minerals and royalties in Dunn County and provide free written offers.
County-level well data, production charts, and selling guides for the counties this field spans:
Trust and restricted interests are held by the United States for the MHA Nation or for individual allottees and are subject to federal restrictions on transfer, with the Bureau of Indian Affairs administering leasing and revenue. They are not interests we buy. Fee minerals located inside the reservation boundary are separate and are ordinary private property.
Your source of payment is the clearest signal: trust royalty typically flows through federal channels rather than directly from the operator, and your documentation will reference the Bureau of Indian Affairs or the Office of Natural Resources Revenue. County deed records and probate files show fee ownership. If you are unsure, we can help you identify which you hold before anything else is discussed.
For trust minerals, yes — leases require federal approval and the Bureau of Indian Affairs administers the process, with tribal authority over tribal minerals. Fee minerals inside the boundary are leased under ordinary North Dakota law. Spacing units can include both categories, which is one reason unit paperwork on Fort Berthold is often more involved than elsewhere.