Marimaca Copper Corp. (TSX: MARI) is pleased to announce results from the first seven reverse circulation drill holes, totaling 2,150m, from the 2022 infill drilling campaign at the Marimaca Oxide Deposit. The first drill holes were completed in the south-eastern area of the MOD in an area previously considered to be on the margin of the near-surface oxide copper mineralization.
The drilling intersected broad zones of near-surface green copper oxide mineralization in six out of seven holes. Importantly, several zones appear to be extensional to the existing Mineral Resource Estimate (released December 2019) for the MOD, and the interpretation of the new mineralized intersections indicates that the MOD remains open at depth and to the south-east, indicating potential upside with ongoing drilling in this area.
A video is available with Hayden Locke, President & CEO, discussing today’s results.
Sergio Rivera, VP Exploration of Marimaca Copper, commented:
“The first seven drill holes were aimed at infilling an area in the south-eastern corner of the MOD that was interpreted in previous as lower grade material and was considered to mark the limits of copper oxide mineralization. We were pleasantly surprised with the results, which show significant mineralization in nearly all of these holes.
“There are two important takeaways from today’s results: firstly, there remains potential resource upside at the MOD, demonstrated by the first holes from the infill program, where several intersections had grades well above those interpreted in the 2019 MRE. Secondly, the results provide confirmation that the MOD remains open to the south-east towards the Sierra Target and at depth. The Sierra Target was hypothesised as an extension of the MOD and these results support that conclusion, which provides an exciting opportunity for further resource growth.
“The infill program will now progress north towards the central part of the MOD targeting conversion of our existing Inferred Resources to Measured and Indicated categories.”
Overview of Drilling Campaign Objectives and Results
Marimaca’s 2022 drilling campaign consists of 22,500m of planned infill drilling of the MOD and an additional 10,000m of drilling of the MAMIX zone, the depth extension of the MOD (see press releases dated February 9, 2022 and January 20, 2022). Both programs will support an updated Mineral Resource Estimate planned for early Q3 2022. The 2022 programs are aimed at converting the MOD’s existing Inferred Resource (see press release dated December 2, 2019) to Measured and Indicated categories, as well as resource growth through infill drilling of the MAMIX discovery made in 2021 (see press release dated October 14, 2021).
Figure 1: Plan View of Infill Drilling Results, Planned Holes and MOD PEA Pit Shell
Figure 2: 2022 Infill Drilling, Looking East, with 2020 PEA Pit Shell
Figure 3: 2022 Infill Drilling, Looking East with 2020 PEA Pit Shell and 0.4% CuT Grade Shell
Figure 4: 2022 Infill Drilling, Looking North, with 2020 PEA Pit Shell and 0.4% CuT Grade Shell
Figure 5: Plan View of Marimaca Oxide Deposit + Satellite Targets (Sierra immediately southeast of MOD)
Table 1. Summary of Drill Results
|Hole||From (m)||To (m)||Length (m)||%CuT|
Table 2. Drill collars and survey
|Hole||Easting||Northing||Elevation (m)||Azimuth||Inclination||Depth (m)|
Sampling and Assay Protocol
True widths cannot be determined with the information available at this time. RC holes were sampled on a 2m continuous basis, with dry samples riffle split on site and one quarter sent to the Andes Analytical Assay preparation laboratory in Calama and the pulps then sent to the same company laboratory in Santiago for assaying. A second quarter was stored on site for reference. Samples were prepared using the following standard protocol: drying; crushing to better than 85% passing -10#; homogenizing; splitting; pulverizing a 500-700g subsample to 95% passing -150#; and a 125g split of this sent for assaying. All samples were assayed for %CuT (total copper) and %CuS (acid soluble copper) by AAS. A full QA/QC program, involving insertion of appropriate blanks, standards and duplicates was employed with acceptable results. Pulps and sample rejects are stored by Marimaca Copper for future reference.
The technical information in this news release, including the information that relates to geology, drilling and mineralization was prepared under the supervision of, or has been reviewed by Sergio Rivera, Vice President of Exploration, Marimaca Copper Corp, a geologist with more than 36 years of experience and a member of the Colegio de Geólogos de Chile and of the Institute of Mining Engineers of Chile, and who is the Qualified Person for the purposes of NI 43-101 responsible for the design and execution of the drilling program.
The QP confirms he has visited the project area, has reviewed relevant project information, is responsible for the information contained in this news release, and consents to its publication.
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