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Marimaca Copper announces results from 2022 diamond drilling programme

Published by , Editorial Assistant
Global Mining Review,

Marimaca Copper Corp. has announced the final diamond drilling (DDH) results from the 2022 geological and geotechnical drilling campaign. Results reported in this release comprise 2762 m of drilling across 12 drill holes located in the central Marimaca oxide deposit (MOD) and target pit-wall areas (for geotechnical purposes) around the perimeter of the MOD. These results are the final assays of the 2022 reverse circulation and DDH programme. Marimaca has finalised plans for the 1Q23 exploration programme, which will follow-up on previously-released DDH hole MAD-22, which intersected primary sulfides (dominantly chalcopyrite) down-dip of the MOD (92 m at 2.11% CuT from 140 m including 22 m at 5.27% CuT).


  • Geological drilling focused on the central zone of the MOD and was orientated at 220° azimuth – targeting cross-cutting intersections of the north-west and west-north-west fault structures that are a dominant control of mineralisation at the MOD.
    • 2022 geological diamond drilling totalled 1600 m across six drill holes (MAD-18, MAD-17, LAD-10, ATD-15, MAD-21, ATD-14).
  • Geotechnical drill holes were focused on the periphery of the MOD and were drilled to gather geotechnical information on the MOD pit wall zones.
    • Notwithstanding this, all holes intersected significant, near surface, mineralised zones with grades at or well above the average for the October 2022 mineral resource estimate. 
    • 2022 geotechnical diamond drilling totaled 1402 m across seven drill holes including previously released MAD-22 (ATD-16, ATD-17, ATD-18, MAD-20, LAD-11, MAD-19).
  • Highlights from reported results include: 
    • MAD-18 intersected 346 m at 0.71% CuT from 4 m, including 90 m at 1.22% CuT from 54 m and 74 m at 1.17% CuT from 276 m.
    • MAD-17 intersected 140 m at 0.50% CuT from 12 m, including 12 m at 1.89% CuT from 140 m. 
    • ATD-15 intersected 110 m at 0.49% CuT from 18 m, including 30 m at 1.07% CuT from 26 m. 
    • ATD-14 intersected 62 m at 0.78% CuT from 102 m, including 10 m at 1.76% CuT from 154 m.
    • LAD-10 intersected 176 m at 0.46% CuT from 114 m.
    • MAD-19 intersected 46 m at 0.49% CuT from 40 m including 24 m at 0.77% CuT from 62 m.
    • MAD-21 intersected 36 m at 0.47% CuT from surface.
  • Results from the geological drilling campaign will be incorporated in the updated 2023 geological model supporting the planned 2023 MRE, while rock quality information from geotechnical drilling will be utilised in the 2023 development workstreams.

Sergio Rivera, VP Exploration of Marimaca Copper, commented:

“The approximately 3000 m of diamond drilling completed alongside our 2022 approximately 38 500 m reverse circulation infill drilling programme provides us valuable information for our next phase of studies at the Marimaca project. Results from the geological drilling, in the central MOD, confirm our current interpretation of the MOD mineralisation model particularly the important structures for higher grade mineralisation. This information is also particularly useful when considering the outstanding results of MAD-22, which we are in the process of following up with additional drilling during the course of 1Q23.

“MAD-22 presents a compelling opportunity for value creation at the MOD, but has also caused us to re-examine our exploration model for satellite targets and we are looking with renewed interest at our extensive land package.

“Work is progressing well on the delivering the upgraded MRE, targeting conversion of resources from the inferred to the measured and indicated categories. It will incorporate the remaining drilling from the 41 500 m of RC and diamond drilling completed in 2022, including the newly discovered shallow high-grade zone at the northern end of the MOD, which we believe will have positive implications for average grade and mineral endowment.”

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