Corporate administration
Corporate administration costs were $828 and $454 for the three months ended June 30, 2021 and 2020, respectively, primarily due to an increase of $346 of stock-based compensation. Corporate administration costs were $1,348 and $844 for the six months ended June 30, 2021 and 2020, respectively. The increase for the first half of 2021 from the prior period was primarily the result of increased expenses of $152 associated with our compliance and regulatory obligations and $360 of stock-based compensation.
Accretion expense
Accretion expense was $20 for each of the three months ended June 30, 2021 and 2020. Accretion expense was $40 for each of the six months ended June 30, 2021 and 2020. We record accretion expense at each reporting period to increase the repurchase option liability to the anticipated exercise amount of $1,000. The repurchase option liability is related to the Company’s option to purchase approximately 640 acres of non-core real property in Wyoming for $1,000 in the form of cash, common shares of the Company, or a combination of cash and common shares of the Company, which matures in October 2021 prior to which the Company intends to seek to extend the option.
Cash Flows, Financial Position, Liquidity and Capital Resources
Cash Flows from Operating Activities
Net cash used in operating activities was $1,284 for the six months ended June 30, 2021, as compared with $1,586 for the same period in 2020. The decrease of $302 in cash used is primarily the result of a decrease in accounts payable and accrued liability outflows, offset by an increase in corporate and administrative expenses.
Financial Position, Liquidity and Capital Resources
At June 30, 2021, our total current assets were $1,540, as compared with $2,753 as of December 31, 2020, which is a decrease of $1,213. The decrease in total current assets is primarily due to a decrease in the combination of cash and cash equivalents due to funding our operations. Our working capital as at June 30, 2021 was $901 as compared with $2,638 at December 31, 2020. The decrease in working capital is primarily due to a decrease in the combination of cash and cash equivalents and an increase in accounts payables and accrued expense due to funding our operations.
In January 2021, as a member of a consortium of companies, we received notice regarding a potential financial award from the DoE for the engineering, construction and operation of a rare earth separation and processing demonstration plant. The consortium of companies, which includes the Company, along with consortium members General Atomics, an affiliate of Synchron, and certain of its affiliates, and LNV, an Ardurra Group, Inc. company, as engineering and construction subcontractor had submitted a formal proposal to the DoE in response to a published Funding Opportunity Announcement in mid-2020 for the construction and operation of a rare earth separation and processing plant utilizing proprietary technology to produce commercial grade products. The DoE funding, if finalized, is in the amount of $21,900 and represents approximately one-half of the total estimated costs for the project and is contingent upon the negotiation of definitive documents. It is the Company’s intent that the demonstration plant will process the already stockpiled high-grade material from the Bear Lodge REE Project. The Company originally expected pre-award negotiations to be completed in the first half of 2021, however, the Company now expects pre-award negotiations to be completed in the second half of 2021. Should the DoE financial award and debt or equity financing not be successfully finalized or completed on a timely basis, the Company anticipates undertaking revised operational plans to reduce spending to cover minimal costs, all of which would raise substantial doubt about the Company’s ability to continue as a going concern within one year from the filing date of this Quarterly Report on Form 10-Q.
During the remainder of 2021, the Company expects to further the plans for the planned demonstration plant including (i) completing further piloting to optimize certain process steps and scale-up design criteria, (ii) confirming operating and capital cost estimates, (iii) finalizing the pre-award negotiations with the DoE for the financial award described above, and (iv) securing additional funding. As noted above, should the DoE financial award and debt or equity financing not be successfully finalized or completed on a timely basis, the Company anticipates undertaking revised operational plans to cover expected operational costs.
In any event, the Company does not have sufficient funds to progress with its planned demonstration plant or feasibility studies, licensing, permitting, development and construction of the Bear Lodge REE Project. Therefore, the achievement of these longer-term