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Copper-focused miner Capstone Mining (TSX: CS) has announced a production and costs beat for 2020, driven by strong fourth-quarter output at both the Pinto Valley open pit mine in Arizona and at the Cozamin underground mine in Mexico.
With a total of 44.4 million lb. of copper generated in the fourth quarter (34.1 million lb. from Pinto Valley and 10.3 million lb. from Cozamin), Capstone’s production for the year comes in at 156.9 million copper lb., surpassing 2020 guidance for 140 to 155 million lb. of the base metal. Consolidated cash costs of $1.68 per lb. copper in the last quarter ($2 per lb. at Pinto Valley and $63¢ a lb. a Cozamin) bring 2020 full-year cash costs to $1.84 per copper lb., below the $1.85 to $2 per lb.
Looking at financial performance, in 2020, Capstone generated $147.2 million from operating activities after changes in working capital, and reported a $16.6 million increase in cash and equivalents, closing out the year with $56.6 million in cash and equivalents.
On Feb. 19, Capstone closed a $150 million streaming agreement with Wheaton Precious Metals (TSX: WPM) which covers 50% of the silver output from Cozamin. Once 10 million oz. have been delivered, the stream would drop to 33% of silver production for the life of the mine. With the closing of this deal, Capstone had a net cash position of $25 million, based on a debt balance of $124.9 million at year-end.
“Last quarter we saw outperformance at both operations delivering operating cash flow of $67 million, which marks the beginning of very strong financial metrics across the business, moving forward in this current $4 copper price environment,” Darren Pylot, president and CEO of Capstone, said in a release.
“Now that the silver stream is closed, we are in a net cash position and are on track to be debt free in 2021, allowing cash flow to be deployed to high-impact, high-return projects like paste backfill at Cozamin and Eriez HydroFloat coarse particle flotation at Pinto Valley.”
This year, Capstone expects 175 to 190 million lb. of copper at cash costs of $1.75 to $1.90 from the two mines.
At Pinto Valley, first phase of the PV3 optimization project, completed last year, allowed the mill to achieve throughputs of 57,168 t/d in the fourth quarter, a 10% improvement over 2019 run rates, with average throughputs of 60,717 t/d in December. The second phase is expected to be complete in the second half of this year – a technical report is also expected in the second half of 2021 on these two optimization projects.
Capstone also reported that, in December, a pilot plant test of the Eriez HydroFloat coarse particle technology achieved 6% to 8% increases in copper recoveries, exceeding the company’s expectations for a 6% improvement in recoveries. An estimated $70 million in expansionary capital would be required to install these units at Pinto Valley.
Additional feasibility-level work is planned to evaluate the mining of resources outside the mine plan, with results anticipated in 2022.
Cozamin is ramping up mill processing, with 3,780 t/d throughputs expected by the end of the first quarter. Based on an updated life of mine plan for this asset, released in January, the underground mine is expected to generate an average of 51.2 million lb. of copper and 1.6 million oz. of silver a year between 2021 and 2030.
Capstone also holds a 70% interest in the permitted Santo Domingo pre-development copper-iron-gold project in Chile; 30% is held by a Korean state-owned enterprise.
(This article first appeared in the Canadian Mining Journal)
