3,750,000 series B warrants, to purchase up to 11,250,000 shares of our common stock at an exercise price of $0.30 per share, for aggregate gross proceeds of $3.0 million. The securities purchase agreement contains customary representations, warranties and covenants, in addition to granting the investors the right to collectively participate in up to 50% of any future offerings of securities by the Company on the same terms as other investors, other than certain “exempt issuances” and “permitted sales” as defined therein, until the first anniversary of the closing date of the offering.
Each Warrant is exercisable six months from April 22, 2020, the date of issuance, and has a term expiring five years after such initial exercise date. The Warrants contain so-called full-ratchet anti-dilution provisions which may be triggered upon any future issuance by the Company of shares of its common stock or common stock equivalents at a per share price below the then-exercise price of the Warrant, subject to certain exceptions; provided, however, that with respect to the Series B warrants, the adjusted exercise price will not be less than $0.26.
Total costs for the offering were approximately $290,000, including the placement agent fee of six percent of the aggregate gross proceeds, except, however, that a reduced fee was accepted with respect to one investor.
Financial Results of Operations
For the results of continuing operations discussed below, we compare the results from operations for the three and nine months ended September 30, 2020 to the results from operations for the three and nine months ended September 30, 2019.
Three Months Ended September 30, 2020
Revenue from oxide plant lease. We recorded revenue of $2.1 million and $1.9 million during three-month periods ended September 30, 2020 and 2019, respectively, related to the lease of our Velardeña oxide plant to a third party. The increase in revenue during 2020 is primarily related to an increase in throughput during the period.
Oxide plant lease costs. We recorded $0.6 million of costs related to the oxide plant lease during each of the three-month periods ended September 30, 2020 and 2019. The costs consist primarily of reimbursable labor and utility costs which for accounting purposes are also included in revenue from the oxide plant lease.
Exploration expense. Our exploration expense, including work at Sand Canyon, Rodeo and other properties, property holding costs and allocated administrative expenses, totaled $1.2 million and $0.9 million for the three months ended September 30, 2020 and September 30, 2019, respectively. The higher exploration expense for 2020 is primarily related to increased exploration at our Rodeo project in Mexico during the period.
Velardeña care and maintenance costs. We recorded $0.2 million and $0.4 million for the three-month periods ended September 30, 2020 and 2019, respectively, for expenses related to care and maintenance at our Velardeña Properties as the result of the suspension of mining and processing activities in November 2015. The reduced costs for 2020 are primarily the result of cost reduction initiatives and the allocation of a portion of personnel costs at the Velardeña Properties in support of activities at the Rodeo project.
El Quevar project expense. We incurred $0.1 million and $0.6 million for the three-month periods ended September 30, 2020 and September 30, 2019, respectively related to holding and evaluation costs for the Yaxtché deposit at our El Quevar project in Argentina. During the three months ended September 30, 2020, approximately $0.1 million of costs actually incurred are anticipated to be reimbursed by Barrick, as discussed above. In addition, the 2019 costs are greater due to a drilling program which began in March 2019.
Administrative expense. Administrative expenses totaled $0.9 million for the three months ended September 30, 2020. Administrative expenses, including costs associated with being a public company, are incurred primarily by our corporate activities in support of the Velardeña Properties, El Quevar project and our exploration portfolio. The $0.9 million of administrative expenses we incurred during the three months of 2020 is comprised of $0.2 million of employee compensation and directors’ fees, $0.4 million of professional fees and $0.3 million of insurance, rents, travel expenses, utilities and other office costs. Administrative expenses totaled $0.7 million for the three months ended September 30, 2019. The $0.7 million of administrative expenses we incurred during the three months of 2019 is comprised of $0.3 million of employee compensation and directors’ fees, $0.3 million of professional fees and $0.1 million of insurance,