13. Sales and Other Income

Revenue is primarily derived from the sale of U₃O₈ to domestic utilities under contracts or spot sales. There were no sales of U₃O₈ in the nine months ended September 30, 2022, or September 30, 2021. Disposal billings were nil and $19 thousand for the three and nine months ended September 30, 2022, respectively, and $9 thousand and $16 thousand for the three and nine months ended September 30, 2021, respectively.

During March 2022, we sold a royalty interest related to Strata Energy’s Lance Uranium ISR Project for $1.3 million. There was no carrying value related to the royalty on our balance sheet therefore the entire amount was recognized as other income.