General and Administrative Expenses
General and administrative expenses for the three months ended June 30, 2024 were $10.3 million, an increase of $2.4 million compared to $7.9 million for the three months ended June 30, 2023. Included within general and administrative expenses are non-cash expenses for unit-based compensation as a result of the amortization of restricted units that have been issued by us over various periods. The increase in general and administrative expenses was attributable to a $1.8 million increase in unit-based compensation expense and cash general and administrative expenses resulting from an increase in our costs associated with company growth.
Interest Expense
Interest expense for the three months ended June 30, 2024 was $6.9 million compared to $6.3 million for the three months ended June 30, 2023. The increase in interest expense was primarily due to an increase in the overall long-term debt balance as a result of borrowings associated with the LongPoint Acquisition, partially offset by a slight decrease in the weighted average interest rate on our outstanding borrowings for the three months ended June 30, 2024.
Income Tax Expense
We recorded an income tax expense of $1.8 million and $0.9 million for the three months ended June 30, 2024 and 2023, respectively.
Comparison of the Six Months Ended June 30, 2024 to the Six Months Ended June 30, 2023
Oil, Natural Gas and NGL Revenues
For the six months ended June 30, 2024, our oil, natural gas and NGL revenues were $164.5 million, an increase of $50.1 million from $114.4 million for the six months ended June 30, 2023. The increase in oil, natural gas and NGL revenues was primarily related to an increase in production volumes for the six months ended June 30, 2024 as discussed below.
Our revenues are a function of oil, natural gas and NGL production volumes sold and average prices received for those volumes. The production volumes were 4,692,312 Boe or 25,782 Boe/d, for the six months ended June 30, 2024, an increase of 1,460,739 Boe or 7,999 Boe/d, from 3,231,573 Boe or 17,783 Boe/d, for the six months ended June 30, 2023. The increase in production for the six months ended June 30, 2024 was primarily attributable to production associated with the MB Minerals Acquisition and the LongPoint Acquisition.
Our operators received an average of $76.87 per Bbl of oil, $2.03 per Mcf of natural gas and $24.72 per Bbl of NGL for the volumes sold during the six months ended June 30, 2024 compared to $72.84 per Bbl of oil, $2.89 per Mcf of natural gas and $24.02 per Bbl of NGL for the volumes sold during the six months ended June 30, 2023. These average prices received during the six months ended June 30, 2024 increased 5.5% or $4.03 per Bbl of oil and decreased 29.8% or $0.86 per Mcf of natural gas as compared to the six months ended June 30, 2023. This change is consistent with prices experienced in the market, specifically when compared to the EIA average price increase of 6.6% or $4.96 per Bbl of oil and decrease of 12.1% or $0.29 per Mcf of natural gas for the comparable periods.
Lease Bonus and Other Income
Lease bonus and other income for the six months ended June 30, 2024 was $1.1 million, a decrease of $1.4 million from $2.5 million for the six months ended June 30, 2023. The decrease in lease bonus and other income was primarily related to a $0.9 million legal settlement received during the six months ended June 30, 2023.
(Loss) Gain on Commodity Derivative Instruments
Loss on commodity derivative instruments for the six months ended June 30, 2024 included $12.5 million of mark-to-market losses and $5.7 million of gains on the settlement of commodity derivative instruments compared to $15.1 million of mark-to-market gains and $4.3 million of losses on the settlement of commodity derivative instruments for the six months ended June 30, 2023. We recorded a mark-to-market loss for the six months ended June 30, 2024 as a result of