The lower exploration expense for 2024 is primarily related to less activity in 2024 due to the cash constraints of the Company.
Velardeña care and maintenance costs. We recorded no expenses related to care and maintenance at our Velardeña Properties for the three-month period ended September 30, 2024 as the Velardeña Properties were discontinued during that period and have either been sold or are being held for sale. We recorded $0.3 million related to care and maintenance for the three-month period ended September 30, 2023.
El Quevar project expense. We incurred $0.2 million and $0.1 million for the three-month periods ended September 30, 2024 and 2023, respectively, related to holding and evaluation costs for the Yaxtché deposit at our El Quevar project in Argentina. Because the Barrick agreement had been terminated in April 2024, there were zero reimbursements from Barrick during the three months ended September 30, 2024. During the three months ended 2023, approximately $0.0 million of costs actually incurred were offset by reimbursements from Barrick.
Administrative expense. Administrative expenses totaled $0.8 million and $1.1 million for the three months ended September 30, 2024 and 2023, respectively. Administrative expenses, including costs associated with being a public company, are incurred primarily by our corporate activities in support of the Yoquivo Property, Rodeo Property, Velardeña Properties, El Quevar project and our exploration portfolio.
Stock-based compensation. During each of the three months ended September 30, 2024 and 2023, we incurred approximately $0.1 million of expense related to stock-based compensation. Stock-based compensation varies from period to period depending on the number and timing of shares granted, the type of grant, the market value of the shares on the date of grant and other variables.
Reclamation and accretion expense. During each of the three months ended September 30, 2024 and 2023, we incurred approximately $0.1 million of reclamation expense related to the accretion of an asset retirement obligation at the Velardeña and Rodeo properties.
Other operating income (loss), net. We recorded $1.6 million of net other operating income for the three months ended September 30, 2024 primarily related to the sale of Silex Argentina and Minera Labri. For the three months ended September 30, 2023, we recorded $0.5 million of net other operating income.
Depreciation, depletion and amortization. We recorded nominal depreciation, depletion and amortization expense during the three months ended September 30, 2024. We recorded approximately $0.1 million for depreciation, depletion and amortization expense during the three months ended September 30, 2023.
Interest and other expense, net. We recorded a nominal amount of interest and other expense, net for each of the three months ended September 30, 2024 and 2023.
(Loss) gain on foreign currency losses. We recorded a nominal amount of foreign currency gains during each of the three months ended September 30, 2024 and 2023. Foreign currency gains and losses are primarily related to the effect of currency fluctuations on monetary transactions incurred by our foreign subsidiaries that are denominated in currencies other than U.S. dollars.
Income taxes. We recorded a zero tax expense for the three months ended September 30, 2024. We recorded a zero income tax benefit for the three months ended September 30, 2023.
Nine Months Ended September 30, 2024
Revenue from the sale of metals. During the nine months ended September 30, 2024, all revenue was generated from the Velardeña properties. The Velardeña operations produced three types of concentrate before operations terminated in March 2024, and also generated revenue from slag sales. During the nine months ended September 30, 2023, the Rodeo operations sold mainly doré. We also sold slag remaining from previous doré sales and doré production at Plant 2.
| ● | Doré Sales - We recorded no revenue related to gold and silver in doré for the nine months ended September 30, 2024, and $9.5 million for the nine months ended September 30, 2023. |