Quick answer: mineral, oil, and gas rights — common in North Dakota because of the Bakken Formation — are classified as real property and can't be transferred using the small estate affidavit. They need probate, a trust, or a transfer-on-death designation instead. See how this affects your own estimate in the North Dakota probate timeline calculator.
A common North Dakota asset with its own rules
A transfer-on-death option built specifically for this
North Dakota's transfer-on-death deed statute, N.D.C.C. Chapter 30.1-32.1, explicitly covers both real estate and mineral, oil, and gas interests. Recorded during life, it lets a mineral interest pass directly to a named beneficiary without probate — a cheaper, simpler option than a full trust for a family whose main concern is a single mineral interest.
When the picture gets more complex
Mineral interests scattered across several counties, or shared among multiple co-owners, often need their own valuation and documentation for each parcel — adding coordination time well beyond a single, straightforward mineral interest. This is where a trust, rather than a series of individual transfer-on-death deeds, sometimes makes more administrative sense.
A local probate attorney can review your estate — many offer a free consultation.