Advantage Lithium completes prefeasibility study on Cauchari in Argentina
Last month, Advantage Lithium (TSXV: AAL) released the results of a prefeasibility study on its 75%- owned Cauchari project in northern Argentina’s Jujuy province.
The prefeasibility outlined an operation producing an estimated 25,000 tonnes per year of battery-grade lithium carbonate over a 30-year mine life.
Pre-production capital is estimated at US$446 million, including a 20% contingency. Steady-state operating costs are forecast to average US$3,560 per tonne battery grade lithium carbonate.
Based on a weighted average price of US$12,166 per tonne of battery grade lithium carbonate over the life of the operation, the study reported an estimated base-case after-tax 8% net present value of US$671 million with an estimated internal rate of return of 20.9%.
Orocobre (TSX: ORL), which developed and is now the operator of the Olaroz lithium facility about 20 km north of Cauchari, is Advantage Lithium’s single-largest shareholder, with 33% of Advantage Lithium’s common shares and a 25% interest in the Cauchari joint venture.
Last year, Orocobre announced plans for an expansion at Olaroz of 25,000 tonnes per year for a total production of 42,500 tonnes lithium carbonate per year (for a proposed mix of 17,500 tonnes per year of battery grade lithium carbonate and 25,000 tonnes per year of primary grade lithium carbonate). Olaroz is currently producing battery grade lithium carbonate from Stage 1. Stage 2 commissioning is expected in the first half of 2021 at an estimated capital cost of US$295 million, including contingency.
Matthew O’Keefe of Cantor Fitzgerald remains cautious about the near-term progress of the 27,772-hectare Cauchari project. “We continue to see Orocobre as the key driver in moving the project forward,” the analyst said in an Oct. 22 research note to clients. “And while their balance sheet appears to be healthy, the company has current expansion commitments with its Phase 2 expansion project at Olaroz.”
The mining analyst noted that he doesn’t expect Orocobre “to be in a rush to start the development of Cauchari,” given the “steep capital and management commitment and the ongoing weakness in the lithium market.”
Based on Cauchari’s prefeasibility study, the project could start as early as 2022, with a three-year ramp up to a steady state production rate of 25,000 tonnes per year of battery grade lithium carbonate.
The early stage study was prepared by Worley, Chile S.A., and outlined proven and probable mineral reserves of 1.02 million tonnes of lithium carbonate equivalent at a concentration of 480 milligrams per liter lithium.
Current reserves are based on a measured and indicated resource released in March of 4.8 million tonnes of LCE at 476 milligrams per liter lithium. Additional inferred resources stand at 1.5 million tonnes LCE at 473 mg/l lithium.
The processing design at Cauchari is based on pumping the lithium-rich brine to surface and diversion to ponds for solar evaporation. According to the company, the magnesium content in the brine is relatively low, so it can be removed with slaked lime as magnesium hydroxide. During evaporation, certain salts would be crystalized to generate a lithium solution for lithium carbonate precipitation. This solution would be polished to remove metals before being re-crystallized to make a battery-grade product.
The next steps for Advantage Lithium will include finalizing a strategic partner and the preparation of a feasibility study. Advantage Lithium has also submitted an Environmental Impact Assessment for the project.
Advantage Lithium started exploration work on the property in 2017.