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Annual report pursuant to Section 13 and 15(d)

Intangible Assets

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Intangible Assets
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] Ìý
Intangible Assets Intangible Assets
Intangible assets, net consisted of the following as of December 31, 2023 and 2022 (in thousands):

Ìý December 31,
2023		 December 31,
2022
Intangible assets, at cost: Ìý Ìý
Saltwater disposal easement $ 17,557Ìý $ —Ìý
Groundwater rights acquired 3,846Ìý —Ìý
Total intangible assets, at cost (1)
21,403Ìý —Ìý
Less: accumulated amortization (378) —Ìý
Intangible assets, net $ 21,025Ìý $ —Ìý
(1)The remaining weighted average amortization period for total intangible assets was 18.8 years as of December 31, 2023.

Acquisitions

For the year ended December 31, 2023, we acquired a saltwater disposal easement and groundwater rights in separate transactions for an aggregate cost of approximately $21.4 million. We had no intangible assets as of December 31, 2022.

Amortization of intangible assets was $0.4 million for the year ended DecemberÌý31, 2023. The estimated future annual amortization expense of intangible assets is $1.1 million for each year of 2024 through 2028, and $15.5 million thereafter.