# Question on mineral interests calculations
**URL:** https://www.mineralrightsforum.com/t/question-on-mineral-interests-calculations/33076
**Category:** Ownership and Title
**Created:** [September 6, 2018, 4:37pm UTC](https://www.mineralrightsforum.com/t/question-on-mineral-interests-calculations/33076 "2018-09-06T16:37:06Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Debra\_Stearns](https://www.mineralrightsforum.com/u/Debra_Stearns)
#### Post date: [September 6, 2018, 4:37pm UTC](https://www.mineralrightsforum.com/t/question-on-mineral-interests-calculations/33076/1 "2018-09-06T16:37:07Z")
My grandfather had 40 NMA in Ward County. In later years he conveyed an undivided ½ interest to my father in that tract. Now each own ½ of the 40 NMA. When my grandfather died he left his interests to his 3 children giving each one 1/3 interest. All of the 3 children have now died and left their children their interests. So the interest my father had from his father gives me and my brother a 1/6 interest each. The ½ interest that my father acquired in later years (as mentioned above) has been divided between my brother and I. So that gives me interest from 2 inheritances, some from my grandfather’s side and some from my father’s side. I am questioning how the land company calculated my interest for bonus payment. On my grandfather’s side they say I have a 1/8 interest out of the 40 NMA for a total of 5 NMA. Not sure where they came up with the 1/8, I would have thought it would have been 1/6 out of 40 NMA. But my biggest concern is how they calculated the interests from my father’s side. They say he had half of 20 acres for a total of 10, so that is split between my brother & I for 5 NMA each. I disagree and believe my father had ½ of the 40 giving him 20 NMA. So when that is split my brother and I would have 10 NMA each, not 5 NMA.
My lease was done in June 2016. If my calculations are correct would I be able to go back to the land company and get paid for the error? Or does it look like the land company was correct in their calculations?
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### Author:  [@TennisDaze](https://www.mineralrightsforum.com/u/TennisDaze)
#### Post date: [September 6, 2018, 5:53pm UTC](https://www.mineralrightsforum.com/t/question-on-mineral-interests-calculations/33076/2 "2018-09-06T17:53:24Z")
It depends on the wording in all of the deeds and the title history. You talk about 40 NMA - do you mean 40 gross acres? Look at the legal description in the deed as it describes the gross acres in which your grandfather owned minerals. Did your grandfather own 100% of the minerals in 40 gross acres = 40 NMA or only 1/2 of the minerals in 40 gross acres = 20 NMA? Next is the wording in deed to your father - did it assign 1/2 of your grandfather’s mineral interest or does the language give your father 1/2 of 1/2 of the minerals? For example, if your grandfather owned 40 acres and it was community property with your grandmother and only his name was on the deed, and he gave 1/2 of his interest to your father, then your father has 1/2 of 1/2 of 40 NMA = 10 NMA. If your grandmother died first, did she have a probated will or did the minerals pass under Texas intestacy law? There are a lot of factors here.
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### Author:  [@bhiggins](https://www.mineralrightsforum.com/u/bhiggins)
#### Post date: [September 6, 2018, 6:00pm UTC](https://www.mineralrightsforum.com/t/question-on-mineral-interests-calculations/33076/3 "2018-09-06T18:00:07Z")
Ha that’s exactly how my reply started Tennis. I saw you replying and know you have good advice, so I let ya have it 👍
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### Author:  [@Debra\_Stearns](https://www.mineralrightsforum.com/u/Debra_Stearns)
#### Post date: [September 6, 2018, 6:36pm UTC](https://www.mineralrightsforum.com/t/question-on-mineral-interests-calculations/33076/4 "2018-09-06T18:36:13Z")
I would like to hire someone to look into this. Is this something you could do? I have a copy of the deed where my grandfather acquired his interest but it does not say how many acres. Where would I find that information?
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### Author:  [@MRFAdmin\_SV](https://www.mineralrightsforum.com/u/MRFAdmin_SV)
#### Post date: [January 11, 2025, 7:30pm UTC](https://www.mineralrightsforum.com/t/question-on-mineral-interests-calculations/33076/5 "2025-01-11T19:30:58Z")