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Great Southern Copper completes ground magnetics survey at San Lorenzo

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Global Mining Review,

Great Southern Copper plc, a company focused on copper-gold exploration in Chile, has completed the processing and interpretation of its ground magnetic data and has identified multiple shallow and buried targets for follow-up exploration at the San Lorenzo copper-gold project located in the coastal cordillera, Chile.

As announced in January 2022, GSC completed a 63.36 km2 ground magnetics survey at San Lorenzo designed to enhance its geological understanding of the project. Processing and interpretation of the magnetic data has since been undertaken by ExploreGeo Pty Ltd, based in Perth, Australia.


  • The magnetics data modelling and interpretation compliments and enhances the company’s mapped surface geology at San Lorenzo, identifies additional structural detail and areas of magnetite-destructive alteration, as well as highlighting areas interpreted to represent buried intrusives.
  • Seven new areas of interest identified in the magnetic interpretation and ranked for follow-up exploration work.
  • Includes 13 near-surface anomalies interpreted as potentially indicative of either zones of higher vein density or small intrusions.
  • Areas of lower magnetic response enveloping the inner calc-potassic alteration are coincident with the Chinchillon Fault and inner propylitic alteration and are interpreted as possible zones of late magnetite destructive alteration.
  • A large zone of weaker magnetic rock located in the southwest portion of the survey area is interpreted as a possible buried monzonitic intrusive that could represent the parent pluton to the numerous mineralised monzonitic dykes and plugs mapped at surface (Rado Monzonites). Follow up exploration in this area is considered a high priority given the relation between monzonite intrusions and mineralisation observed elsewhere on the project.

Drill planning for San Lorenzo

Planning for Great Southern Copper’s first phase of reconnaissance exploration drilling at San Lorenzo is now underway with drilling anticipated to commence in June 2022, subject to rig availability, permitting and approvals. An initial 10 – 15 diamond drill holes (2000 – 2500 m) will initially test shallow geological targets; in particular, fracture-hosted alteration zones in inner calc-potassic (ICP) altered biotite granodiorite with coincident rock-trench geochemistry anomalism and secondly, areas of monzonitic intrusions with coincident rock-trench geochemistry anomalism. The programme is designed to enhance the geological understanding of the mineralising system at San Lorenzo and provide vectors for further induced polarisation (IP) geophysics and follow-up drilling programmes.

Sam Garrett, CEO of Great Southern Copper, said: “The results from the recent ground magnetic survey identified multiple new targets worthy of further exploration and enhances our geological understanding of the San Lorenzo project. With ground-truthing of the anomalies and interpretation underway by our team on site, plans are progressing well for the company’s first reconnaissance exploration drilling programme at San Lorenzo. Negotiations with drilling contractors are underway to secure rig availability and we hope to be mobilising a rig to site before the end of June 2022.”

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This article has been tagged under the following:

Copper mining news Gold mining news South American mining news