the Difference between Net Mineral Acres (NMA) and Net Royalty Acres (NRA)

Many oil and gas professionals often calculate valuations of minerals on a Net Royalty Acre basis. This is a mathematical concept to normalize variations in royalty rates. For example, if you and I each own the exact same net mineral acres in a parcel of land, but I have leased my minerals at a 1/8th royalty rate and you have leased yours at a 1/4th royalty rate, the revenues you will receive will be twice as much as I will receive. As such, your producing minerals are worth roughly twice as much as mine. The way these interests are normalized is as a ratio of the royalty rate relative to a “standard” 1/8th royalty rate. So, if we each own 40 net mineral acres at these royalty rates, I would own 40 net royalty acres and you would own 80 net royalty acres.

Generally speaking, the formula to calculate royalty acres is as follows:

Net Royalty Acres (NRA) = Net Mineral Acres (NMA) x (Lease Royalty Rate / [1/8 Standard Royalty Rate])

To amend our example, let’s say I leased my interest at a 1/5th royalty rate. We would calculate my net royalty acres as follows:

NRA = 40.00 net mineral acres x ([1/5] Lease Royalty Rate / [1/8] Standard Royalty Rate)
NRA = 40.00 x (0.20 / 0.125)
NRA = 40.00 x 1.60
NRA = 64.00 Net Royalty Acres

This mathematical concept can also be used inversely to calculate your net mineral acres in a parcel based on the Net Revenue Interest (NRI) you are receiving in a well or unit.

Pro Tip:

Landowner Problem: You inherited a large number of properties and don’t know where to begin figuring out what or how much you own.

Pro Tip Solution: Start by looking for any source documents you may already have. Specific examples would be the probate records of your predecessor or the deeds whereby they acquired the properties. If you don’t have those records, you can start by listing the properties you are being paid for. Review your checks and list the names of the wells and their respective counties/ states. Then you can search the respective state regulatory agency or a fee-based service provider to find where those properties are located geographically. Contact the operators to see if they can tell you what your ownership is (both net and gross acreage) as a successor owner. Similarly, every time you are contacted to sell or lease your minerals, have the offering party provide you with a copy of the source document (they often have some access to the records that indicate your ownership). Create a database list of some kind that helps you list these properties and wells. Don’t feel that you must make it overly complicated at first, just make it something that you can build, work with, and understand. In the end, know that there is a community here at NARO that can help you gain control and confidence in the management of your assets.

Reference:
"How to Calculate your Gross and Net Mineral Acreage?"
https://www.youtube.com/watch?v=LiHiBRkyZA4&feature=youtu.be

Supplemental NMA and NRA definitions

Understanding the distinction between Net Mineral Acres (NMA) and Net Royalty Acres (NRA) is essential for mineral owners, as these terms are used to calculate ownership and revenue from mineral rights. Below is a detailed explanation of their differences, along with citations from the provided documents.

1. Net Mineral Acres (NMA)

Net Mineral Acres represent the actual ownership stake in a mineral tract, independent of the royalty rate.

It is the proportion of the total acreage in which you own mineral rights.

Key Characteristics

  • Ownership: NMA reflects the percentage of mineral rights owned in a specific tract of land.
  • Calculation: NMA is calculated based on the gross acreage of the tract and the percentage of ownership.
    Example: If you own 50% of the mineral rights in a 100-acre tract, you have 50 Net Mineral Acres.
  • Usage: NMA is used to calculate lease bonuses, unit participation, and other ownership-related metrics.

2. Net Royalty Acres (NRA)

Net Royalty Acres provide a standardized way to compare the economic value of mineral rights, taking into account the lease royalty rate.

NRA adjusts NMA based on the royalty rate specified in the lease.

Key Characteristics

  • Economic Value: NRA reflects the revenue potential of mineral rights, normalized to a standard royalty rate.
  • Calculation: NRA is calculated using the formula:
    NRA = NMA × (Lease Royalty Rate / Standard Royalty Rate)
     Example: If you own 20 NMA leased at a 25% royalty rate, your NRA would be:
NRA = 20 × (0.25 / 0.125) = 40 Net Royalty Acres
  • Usage: NRA is used to compare mineral interests leased at different royalty rates on an apples-to-apples basis.

3. Key Differences

Aspect Net Mineral Acres (NMA) Net Royalty Acres (NRA)
 Definition  Ownership stake in a mineral tract.  Economic value of mineral rights normalized to a standard royalty rate.
 Calculation  Based on gross acreage and ownership percentage.  Adjusts NMA based on lease royalty rate.
 Usage  Used for lease bonuses and unit participation.  Used for comparing value across different royalty rates.
 Focus  Ownership percentage.  Revenue potential.

4. Practical Implications

  • NMA: Helps determine ownership and participation in drilling units.
  • NRA: Provides a standardized metric for valuing mineral rights, especially when comparing tracts with different royalty rates.

Conclusion

Net Mineral Acres (NMA) and Net Royalty Acres (NRA) are both important metrics for mineral owners, but they serve different purposes. NMA reflects ownership, while NRA provides a way to compare the economic value of mineral rights across varying royalty rates. Understanding these concepts can help mineral owners make informed decisions about leasing, selling, or valuing their assets.