Interest Income
For the three months ended June 30, 2023 and 2022, the Company generated interest income of $139 and $21, respectively, and $261 and $22 for the six months ended June 30, 2023 and 2022, respectively, from investments of the remaining proceeds from its December 2021 rights offering. These increases from period-to-period were primarily the result of the substantially higher short-term interest rates that existed during 2023, partially offset by the lower average cash balances available for investment during the three- and six- month periods ended June 30, 2023.
Accretion expense
We recorded accretion expense of $71 for each of the three months ended June 30, 2023 and 2022 and $142 for each of the six months ended June 30, 2023 and 2022, in each case related to the Company’s option to repurchase approximately 640 acres of non-core real property in Wyoming for not less than $1,200 nor greater than $1,850 in the form of cash, or a combination of cash and common shares of the Company. Accretion expense is recorded each reporting period to increase the repurchase option liability to the maximum exercise price of $1,850, less any annual option payments of $25. See Note 7 to the Consolidated Financial Statements for a more complete discussion of the repurchase option.
Financial Position, Liquidity and Capital Resources
Operating Activities
Net cash used in operating activities was mostly unchanged for the comparative six-month periods, rising to $4,072 for the six months ended June 30, 2023 from $3,969 for the six months ended June 30, 2022 for a change of $103. This change was largely driven by the increase in exploration and evaluation spending of $2,178 partially offset by working capital reductions of $1,707.
Investing Activities
Net cash used in investing activities of $4 for the six months ended June 30, 2023 resulted from a $12 sale of non-essential equipment, offset by a $16 purchase of equipment. There were no similar transactions during the six months ended June 30, 2022.
Financing Activities
Net cash provided by financing activities of $7 for the six months ended June 30, 2023 stemmed from the exercise of 100,000 stock options. There were no similar transactions during the six months ended June 30, 2022.
Financial Position, Liquidity and Capital Resources
At June 30, 2023, we had a working capital balance of $13,129, which represented a decrease of $4,499 from our December 31, 2022 working capital balance of $17,628. This decrease was largely the result of amounts paid by the Company during the six months ended June 30, 2023 under the Cost Share Agreement and for the payment of other ongoing expenses.
In June 2023, the Company entered into the Funding Agreement for its previously announced award of a $4,400 grant from the WEA to be used toward the advancement of the Demonstration Plant. The WEA grant is a cost-reimbursement award that will be available to the Company for the reimbursement of future Demonstration Plant expenses. As of June 30, 2023, no amount of the $4,400 award had been received by the Company and no amounts related to this grant have been included in the Company’s June 30, 2023 financial statements. The Company may be able to claim a portion of the $4,400 grant during the latter half of 2023 as discussed more fully in Note 7.
Inclusive of amounts already advanced of $9,700 through June 30, 2023, the Company’s share of the total costs under the Cost Share Agreement are expected to equal or exceed $22,000 over the life of the Demonstration Plant project. As a result, the Company will not have sufficient funds to progress its other activities, including with respect to feasibility studies, permitting, development and construction related to the Bear Lodge REE Project, even after taking into account the expected receipt of the $4,400 in WEA grant monies. Therefore, the achievement of these other activities will be dependent upon additional financings, off-take agreements, joint ventures, strategic transactions, grants, or sales of various assets. There can be no assurance, however, that the Company will be