Josemaria is a large-scale copper-gold-silver venture. The venture is wholly owned and operated by Lundin Mining’s Argentinian subsidiary Desarrollo de Prospectos Mineros S.A. Lundin Mining acquired the venture with the April 2022 acquisition of Josemaria Sources Inc.
Josemaria is situated within the San Juan Province of Argentina, roughly 9 km east of the Chile-Argentina border. The venture topography is mountainous with broad, flatbottomed valleys and reasonably steep slopes ranging in elevation from roughly 4,000 to 4,900 m above sea degree. Entry to website is to be from town of San Juan, a significant mining centre, alongside public two-lane paved roads and a project-developed and maintained gravel street. The venture has prepared entry to water, grid energy, in addition to transportation and logistics infrastructure wholly inside San Juan province.
The Josemaria venture is to be developed as a large-scale open pit mining operation. As presently envisaged, over 1 billion tonnes of ore will likely be mined at common diluted head grades of roughly 0.30% copper, 0.22 g/t gold and a strip ratio of 0.98 over a 19-year mine life.
The venture is to make use of typical truck and shovel open-pit mining with typical major crushing, grinding and flotation at an estimated common processing price of 152,000 t/d. Amenities on website embody crushing, grinding, flotation, focus and tailings thickening, focus filtration, storage and loadout. To maximise productiveness, effectivity and security in a high-altitude atmosphere, features will likely be autonomously operated as a lot as attainable.
Run-of-mine materials will likely be delivered from the open pit to 2 gyratory crushers with crushed ore transported through an overland conveyor to a rough ore stockpile. Materials will likely be reclaimed from the coarse ore stockpile and conveyed to a few SAG mill/ball mill circuits. Standard copper rougher flotation, adopted by focus re-grinding and copper cleaner flotation, will end result within the manufacturing of a copper focus with a copper grade of 26% to 32% copper and payable treasured metals. The gold-rich copper focus is to be transported by truck to San Juan, the place will probably be loaded onto rail and brought to the port at Rosario for export to worldwide clients.
Josemaria is classed as a porphyry copper-gold system. The deposit space presently measures roughly 1,500 m north-south by 1,000 m east-west and 600 to 700 m vertically from floor, inside a bigger alteration footprint of as much as 4 km north-south by 2 km east-west. The deposit stays open to the south, beneath a thickening cowl of put up mineral volcanic rocks and in addition at depth.
Mineral zones are outlined by the relative abundance of chalcopyrite, pyrite and chalcocite, in addition to the mode of incidence of chalcocite (hypogene or supergene) and degree of oxidation. Chalcopyrite and pyrite are disseminated by the potassic and overprinting chlorite-sericite zones, with minor bornite. Sulphide mineralization within the higher superior argillic and sericitic domains features a hypogene-enriched high-sulphidation assemblage of chalcocite with covellite, tennantite, and minor enargite, leading to among the highest hypogene grades within the deposit.
Twelve drilling campaigns have been carried out on the deposit since its discovery in 2003/2004 area season. The primary gap drilled encountered 280 metres grading 0.61% copper and 0.51 g/t gold. Drilling to March 2022 totaled practically 96,800 m in 228 drill holes, of which 48 holes are reverse circulation holes and 180 holes are core holes, together with 14 condemnation holes and 15 geotechnical holes. Lundin Mining believes there may be vital potential to additional improve worth over the longer-term leveraging its copper-focused exploration experience. Exploration potential in a extremely potential and rising district, mixed with the big Mineral Useful resource base, place Josemaria as the middle of gravity for future improvement and growth.
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Josemaria Project – Lundin Mining Corporation