Marimaca Copper Corp. (TSX: MARI) is pleased to announce further results from the 2022 infill and extensional drilling campaign at the Marimaca Oxide Deposit. Results reported are for a total of 7,102m across 35 reverse circulation drill holes.
The drilling intersected two higher grade green oxide zones located in the northern, Atahualpa, sector of the Marimaca Oxide Deposit. Green oxides typically have higher acid solubilities and expected higher recoveries based on the results of the various phases of comprehensive metallurgical testing completed. Results from the 7,102m released today were received post the data cut-off for the 2022 Interim Mineral Resource Estimate (see press release dated October 13, 2022) and will be captured in the updated MRE planned for Q1 2023.
The Atahualpa sector, forming the northern extent of the MOD, was previously considered to be host to dominantly lower grade green and black oxide mineralization and today’s results highlight the potential for the definition of additional high-grade centers, similar to that found in the south-central MOD (see Figure 2).
Sergio Rivera, VP Exploration of Marimaca Copper, commented:
“As with previous infill drilling campaigns at the MOD, we have been pleasantly surprised by this set of results, located towards the northern end of the MOD. Drilling has intersected broad zones of high-grade oxide mineralization, in most cases near or at surface. The grades are significantly above those interpolated for the northern area in previous MREs and, as such, we expect this drilling to have positive implications for the average grade of our Q1 2023 MRE update, which is targeting 90% of resources in the Measured and Indicated Categories.
The October 2022 MRE included infill drilling across the central high-grade core of the MOD, which is an important driver of the Marimaca Project’s strong project economics, with the results only improving our confidence in its continuity and grade. This new discovery complements and extends the high-grade core and, given its near surface nature, it will also likely form part of the early years of mine life. We, therefore, expect this drilling to lead to further improvement the Project’s already exceptional economics.
The final 2023 MRE will form the basis the Definitive Feasibility Study, which will be completed in 2023 and will contemplate production scenarios in the range of 50kt to 60kt of copper cathode per annum.”
Overview of Drilling Campaign Objectives
Marimaca’s 2022 drilling campaign consists of over 41,500m of RC and diamond drilling between the MOD infill and the MAMIX zone, the depth extension of the MOD. The 2022 MRE, announced on October 13, 2022 incorporates 19,580m of ~41,500m of drilling (reverse circulation (“RC”) + diamond) completed in 2022 for a total of over 110,000m of drilling completed since 2016. The balance of the 2022 infill drilling program, totalling approximately 28,000m including the 7,102m of drilling announced today, will be included in a subsequent MRE planned for early 2023 with the objective of converting the remaining Inferred Resources to the Measured and Indicated Categories to underpin the Definitive Feasibility Study (“DFS”) planned for 2023.
Figure 1: Plan View of Infill Drilling Results
Figure 2: Plan View – 2022 MRE plan view with grade distribution
Figure 3: 3D View – Highlight Infill Results with 2022 MRE Pit Shell
Figure 4: 3D View – North-East High Grade Zone with Highlight Infill Results 2022 MRE 0.60% CuT Grade Shell
Table 1. Summary of Drill Results
|Hole||Depth (m)||From (m)||To (m)||Intercept (m)||CuT (%)|
|ATR-131||160||No significant intercepts|
|ATR-134||160||No significant intercepts|
|LAR-98||200||No significant intercepts|
Table 2. Drill Collars and Survey
|Hole||Easting||Northing||Elevation (m)||Azimuth||Inclination||Depth (m)|
*Target depth not reached
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 Paola Kovacic, Exploration Manager, Marimaca Copper Corp, a geologist with more than 20 years of experience and a member of the Colegio de Geólogos de Chile and of the Society of Economic Geologist USA, , 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 she 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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