Annual report pursuant to Section 13 and 15(d)

Royalty Interests

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Royalty Interests
12 Months Ended
Dec. 31, 2019
Real Estate [Abstract]  
Royalty Interests Royalty Interests
As of December 31, 2019 and 2018, the Trust owned the following oil and gas royalty interests (in thousands, except number of interests):
Net Book Value
December 31, 2019 December 31, 2018
1/16th nonparticipating perpetual royalty interests (1)
$ —    $ —   
1/128th nonparticipating perpetual royalty interests (2)
—    —   
Royalty interests acquired (3)
29,320    24,303   
Total royalty interests, gross $ 29,320    $ 24,303   
Less: accumulated depletion (260)   —   
Total royalty interests, net $ 29,060    $ 24,303   

(1) Nonparticipating perpetual royalty interests in approximately 370,737 gross royalty acres as of December 31, 2019 and 2018, respectively.

(2) Nonparticipating perpetual royalty interests in approximately 84,934 gross royalty acres as of December 31, 2019 and 2018, respectively.

(3) Royalty interests in approximately 3,074 net royalty acres and approximately 1,826 net royalty acres as of December 31, 2019 and 2018, respectively.

No valuation allowance was necessary at December 31, 2019 and 2018.

Real Estate and Royalty Interests Assigned Through the 1888 Declaration of Trust
 
The fair market value of the Trust’s Assigned royalty interests was not determined in 1888 when the Trust was formed, and accordingly, these Assigned royalty interests were recorded with no value. See Note 2, “Summary of Significant Accounting Policies — Real Estate and Royalty Interests Assigned Through the 1888 Declaration of Trust for further information regarding the Assigned royalty interests. The Assigned royalty interests include 1/16th and 1/128th royalty interests.

Royalty Interests Transactions

For the year ended December 31, 2019, the Trust acquired oil and gas royalty interests in approximately 1,247 net royalty acres (normalized to 1/8th) for an aggregate purchase price of $4.7 million, an average price of approximately $3,800 per net royalty acre.

For the year ended December 31, 2018, the Trust sold nonparticipating perpetual oil and gas royalty interests in approximately 812 net royalty acres (1/8th interest) for approximately $18.9 million, an average price of approximately $23,234 per net royalty acre. In conjunction with this sale, the Trust acquired oil and gas royalty interests in approximately 1,480 net royalty acres for an aggregate purchase price of $20.6 million, an average of approximately $13,949 per net royalty acre.

Additionally, for the year ended December 31, 2018, the Trust acquired oil and gas royalty interests in approximately 346 net royalty acres for an aggregate purchase price of $3.7 million, an average price of approximately $10,555 per net royalty acre.
There were no oil and gas royalty interest transactions for the year ended December 31, 2017.