Paul Libner
Analyst · CIBC
Thanks, Martin. I'll now turn to Slide 8 and give an overview of the financial results for the quarter. For this discussion, I'll be comparing the quarter ended March 31, 2024, to the prior year quarter.
Revenue was down 13% to $149 million for the quarter. We had a strong first quarter of 2023, in fact, it was the second highest quarterly revenue in the history of the company. And as Martin mentioned in his remarks, lower contributions from Mount Milligan, Pueblo Viejo and the Cortez Legacy Zone were the main drivers for the lower revenue in the current quarter. The lower contributions from these properties were partially offset by higher contributions from Wassa and Xavantina as well as higher average gold and silver prices.
Gold and silver were up 10% and 4%, respectively, while copper was down 5% over the prior period. As Bill mentioned, gold continues to be the dominant revenue source, making up 75% of our total revenue for the quarter, followed by silver, 13% and copper at 9%. Royal Gold has the highest gold revenue percentage compared to our major peers in the royalty and streaming sector.
Turning to Slide 9, I'll provide a bit more detail on the specific line items for the quarter. G&A expense increased slightly to $11.4 million from $11 million in the prior year quarter. The slight increase was due to higher corporate costs and noncash stock compensation expense. Although we did see a small increase over the prior year, our cash G&A costs remain low as an overall percentage of total revenue.
Our DD&A expense decreased to $39 million from $46 million in the prior year. On a unit basis, this expense was $539 per GEO for the quarter compared to $514 per GEO in the prior year. The higher D&A per unit was mostly due to lower GEOs sold in the current period. The lower overall depletion expense, however, was due to a decrease in our Mount Milligan gold depletion rate from $425 to $371 per ounce as well as a decrease in copper and gold sales from Mount Milligan and lower production from the Cortez Legacy Zone.
Interest expense decreased nearly 50% to $4.6 million for the quarter. The decrease was primarily due to lower average amounts outstanding on the revolving credit facility. The all-in interest rate for outstanding borrowings under our credit facility was 6.5% at the end of March.
Tax expense for the quarter was $27 million, resulting in an effective tax rate of 36.4%. This compares to tax expense of $15.9 million and an effective tax rate of 19.9% in the prior year. The higher tax expense this quarter was due to a onetime discrete tax expense of $13 million related to consideration received from the Mount Milligan cost support agreement.
Excluding this discrete item, our effective tax rate for the quarter was approximately 19%, which is in line with the prior year period and our expectations for the full year.
Net income for the quarter was down over the prior year to $47 million or $0.72 per share. The decrease in net income was due to lower revenue and the discrete tax item I just mentioned. After adjusting for the discrete tax item and a small change in the fair value of equity securities, net income for the quarter was $60 million or $0.91 per share.
Our operating cash flow was a record this quarter at $138 million and up 27% over the prior year period. Operating cash flow for the current quarter included payments of $24.5 million as part of the Mount Milligan Cost Support Agreement and $12 million in capitalized interest received as part of the Khoemacau loan facility repayment. And the strong cash flow does not even include the $25 million we received as repayment of principal on the Khoemacau loan, which is recorded under cash from investing activities.
I'd like to take a moment now to explain the accounting treatment of the Mount Milligan Cost Support Agreement. When we entered into the agreement, we received a cash payment, the commitment by Centerra to deliver 50,000 ounces of gold in the future and a free cash flow interest. With respect to the value of the cash consideration and the free cash flow interest, these have been recorded as a $25 million deferred support liability on the balance sheet. This amount will be amortized on units of production basis over the Mount Milligan mine life, beginning with the first cost support payment made which we expect will be around 2030.
With respect to the deferred gold consideration, when the gold is received, we will bring these ounces on to our balance sheet at fair market value. When the ounces are subsequently sold or upon receipt of the gold prior to any sale, we expect the value will also be recorded within the deferred support liability and amortize on units of production basis as we provide future cost support over the mine life at Mount Milligan.
It is important to note that we subsequently sell the deferred gold ounces, the proceeds will be recognized within other operating income and not recognized as royalty or stream revenue. Upon delivery of the deferred gold ounces, we anticipate selling gold over a few days to a week following delivery. Finally, the proceeds from the sale of the deferred gold ounces will be recognized as operating cash flow.
I will now turn to Slide 10 and provide a summary of our financial position as of March 31. During the quarter, we repaid $100 million on our revolving credit facility and reduced the amount drawn to $150 million bringing our total available liquidity to $966 million as of March 31.
Further, using the cash received as part of the Khoemacau loan repayment in late March as well as our cash on hand, we made an additional revolver payment of $25 million on April 8 and another $50 million payment yesterday, leaving us with $75 million outstanding and $925 million undrawn and available.
Absent significant business development activity and as cash flow allows, we expect to fully repay our remaining revolver balance by sometime early in the third quarter. We have no material financial commitments outstanding. However, I will note that we made a small advanced payment of $1.1 million to Arrow Copper as part of the success-based payment for resource additions at Xavantina.
There are potentially up to $3.3 million of further success-based payments to Arrow that remained through the end of 2024.
That concludes my comments on our financial position for the quarter, and I will now turn the call back to Bill for closing comments.