land_ownership · ownership
Net Mineral Acres (NMA)
NMA = Gross Tract Acres × Mineral Interest Fraction
click formula to derive ↑
Inputs
acres
fraction
Description
Computes Net Mineral Acres (NMA) — the specific, named acreage quantity that appears on mineral deeds, lease offers, and division orders — from a tract's gross acreage and the owner's mineral interest fraction. NMA is the quantity that feeds directly into royalty and decimal-interest calculations once the tract is pooled into a larger spacing unit.
Variables
| Symbol | Unit | Description |
|---|---|---|
| NMA | acres | Net Mineral Acres |
| A_t | acres | Total gross acreage of the tract in which the mineral interest is owned. |
| f_m | fraction | The mineral owner's undivided fractional interest in the tract's minerals, already net of any prior conveyances or reservations. |
Assumptions
- The mineral interest fraction already reflects the owner's final undivided share after accounting for any prior conveyances, reservations, or inheritance splits — it is not derived here.
- The tract is treated as a single, whole ownership unit; multiple tracts must be computed separately and summed.
Limitations
- Does not itself account for pooling into a larger spacing/drilling unit — NMA computed here is tract-level; see the Royalty Interest calculator for the unit-level royalty share once NMA is pooled.
- Does not verify or derive the mineral interest fraction itself from a chain-of-title or probate record — that fraction must be independently confirmed.
Use Cases
- → Lease offer verification: Confirm a lease offer's stated NMA matches the owner's actual tract acreage and mineral interest fraction.
- → Pre-pooling royalty estimation: Compute NMA before a well is drilled or pooled, as the first step toward estimating expected royalty revenue via the Royalty Interest calculator.
Related Calculations
Region Notes
General (U.S.)
Common U.S. Public Land Survey System tract sizes are 40, 80, and 160 acres (quarter-quarter, half-quarter, and quarter sections); tracts described by metes and bounds (common in Texas and other non-PLSS states) can be any size — always use the acreage stated in the actual legal description.
References
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