Marimaca Copper Corp. (TSX: MARI) is pleased to announce that reverse circulation drilling completed at the Mercedes Target has intersected significant oxide copper mineralization from surface, with an initial area of interest measuring 400m along strike and 300m width. A total of 17 holes were completed of which 12 intersected mineralization. Mercedes is located less than 1km to the north of the northern edge of the Marimaca Oxide Deposit and offers clear potential to add to the Company’s leachable resource base.
Sergio Rivera, VP Exploration of Marimaca Copper, commented:
“We are very pleased with the results from the discovery drilling campaign at Mercedes, which has identified significant shallow oxide copper mineralization less than one kilometre away from the flagship Marimaca oxide deposit. The mineralization consists of broad zones of predominantly green oxides, commencing at surface, with some mixed, enriched and copper wad sections.
“The structural controls observed at Mercedes are very similar to the MOD and we note that the higher-grade materials appear to be spatially related to the presence of dacitic dykes, which become more prevalent to the east of the currently drilled area.
“Mercedes remains open to the east and to the south, where it is within 1km of the northern extent of the MOD. We are examining whether Mercedes and the MOD may be part of a larger mineralizing system and plan further exploration accordingly.”
Hayden Locke, President and CEO, of Marimaca Copper, commented:
“We have now drilled two conceptual exploration targets and identified significant shallow, oxide, copper mineralization in both. We have several other targets close to the MOD that have yet to be drilled, and we take great encouragement from the success at both Cindy and Mercedes. We own the entire land position, which we believe is prospective for Marimaca style mineralization, and this will allow any shallow oxide discoveries to form part of our future development plans and add value to what is already a project with compelling economics.”
Overview of Drilling Campaign Objectives and Results
The initial drilling campaign at Mercedes (located less than 1km to the north of the northern edge of the MOD) consisted of nine shallow, RC drill holes targeting the anomalies identified in both the magnetic survey and surface geochemical sampling previously completed (refer to announcements on 23 September 2020 and 17 February 2021 respectively). Based on the results of the first nine holes, the program was extended to seventeen holes across approximately 700m of north-south strike. The objective was to identify new, broad zones of shallow oxide mineralization that could complement the existing resources at the MOD.
Figure 1: Plan view of Selected Drill Holes at Mercedes
The seventeen holes were drilled at various orientations over an area of approximately 700m by 300m, and eight encountered notable oxide copper mineralization. Drill holes MER-03, MER-04, MER-06, MER-12, MER-16 and MER-17 in particular, intersected broad zones (approximately 50m downhole or more) of oxide copper mineralization commencing near surface. These drill holes define an approximate area of interest for follow up drilling extending 400m north-south and 300m east-west.
MER-12, located on the northern limb of the area of interest, was an especially positive drill hole, intersecting 86m with an average grade of 0.44% CuT from 6m, including a higher-grade zone of 42m at 0.64% CuT. As at the MOD, this mineralization is structurally controlled by pervasive east dipping fractures in the host monzodiorite and consists of dominant atacamite-brochantite and chrysocolla with increasing copper wad material in the deeper intersections.
In addition to drilling, the Company has completed extensive mapping and sampling of the small scale historical underground workings at Mercedes. The results from this work highlights the extensive and continuous nature of the mineralization with broad zones of copper oxide. The underground workings were sampled continuously over 434m with an average grade of 0.49% CuT over this length and encompassing several higher-grade zones, including 66m at 0.80% CuT, 60m at 0.70% CuT, and 20m at 1.55% CuT. The copper minerals were the same as those observed in the drilling program.
Figure 2: Plan view of Mercedes and Selected Results of Underground Mapping and Channel Sampling
Mercedes is structurally controlled by a pervasive sheeted fracturing of the intrusive host, which dips to the east at between 45 and 60 degrees. Similar to the MOD, there is zonation of mineralization trending from more dominant green oxides at the top of the intersections to more mixed and copper wad types at the peripheries and towards the bottom of the intersections.
Figure 3: Cross Section EW 7,437,725 (Drill holes MER-12 and MER-14)
Figure 4: Cross Section EW 7,437,600 (Drill holes MER-12 and MER-14)
Overview of Mercedes
Mercedes is located less than 1km from the northern edge of the MOD. It was identified initially through the results of the high-resolution drone-mounted magnetic survey (refer to release on 23 September 2020), which was followed up by reconnaissance mapping and geochemical sampling (refer to release on 9 December 2020).
Mercedes is hosted in the same intrusive units as the MOD, which shows pervasive fracturing striking north to south with an easterly dip of between 45 and 60 degrees. The unit is cross-cut by various dykes and faults, all of which are important for the development of copper mineralization.
Mercedes is the second of three new exploration targets drilled by the Company within a radius of 5km around the MOD, each of which presents a compelling opportunity to add shallow, oxide resources to the MOD project.
Figure 5: Map of MOD Resource and Near MOD Exploration Targets
Summary of Mercedes Drilling Results
|MER-01||7,437,463||374,798||270||-60||300||28m @ 0.21% CuT from 4m; and
10m @ 0.23% CuT from 92m; and
6m @ 1.18% CuT from 130m
|MER-02||7,437,458||374,800||220||-60||300||16m @ 0.15% CuT from 6m; and
12m @ 0.43% CuT from 30m; and
10m @ 0.28% CuT from 150m
|MER-03||7,437,603||374,657||270||-60||300||94m @ 0.30% CuT from 4m including 58m @ 0.34% CuT; and
10m @ 0.37% CuT from 118m; and
20m @ 0.33% CuT from 140m; and
20m @ 0.31% CuT from 270m
|MER-04||7,437,601||374,661||220||-60||300||86m @ 0.26% CuT from 6m including 36m @ 0.34% CuT|
|MER-05||7,437,609||374,595||270||-60||250||6m @ 0.81% CuT from 40m; and
16m @ 0.27% CuT from 98m; and
12m @ 0.44% CuT from 140m; and
12m @ 0.31% CuT from 224m
|MER-06||7,437,606||374,737||270||-60||300||74m @ 0.30% CuT from 18m including 46m @ 0.38% CuT; and
10m @ 0.26% CuT from 100m; and
48m @ 0.26% CuT from 132m including 18m @ 0.52% CuT; and
24m @ 0.13% CuT from 202m
|MER-09||7,438,050||374,659||270||-60||200||6m @ 0.31% CuT from 92m; and
24m @ 0.17% CuT from 126m
|MER-12||7,437,738||374,648||270||-60||270||86m @ 0.44% CuT from 6m including 42m @ 0.64% CuT; and
16m @ 0.27% CuT from 122m; and
20m @ 0.22% CuT from 238m
|MER-13||7,437,857||374,719||270||-60||200||6m @ 0.33% CuT from 70m|
|MER-14||7,437,724||374,724||270||-60||250||26m @ 0.42% CuT from 80m including 12m @ 0.69% CuT; and
8m @ 0.36% CuT from 212m
|MER-15||7,437,717||374,720||220||-60||250||12m @ 0.19% CuT from 2m; and
18m @ 0.31% CuT from 46m; and
6m @ 0.45% CuT from 74m; and
12m @ 0.24% CuT from 118m
|MER-16||7,437,540||374,643||270||-60||250||48m @ 0.42% CuT from 20m including 20m @ 0.57% CuT; and
12m @ 0.30% CuT from 76m; and
20m @ 0.14% CuT from 90m; and
12m @ 0.15% CuT from 158m; and
8m @ 0.15% CuT from 194m
|MER-17||7,437,422||374,816||220||-60||250||50m @ 0.25% CuT from 2m; and
6m @ 0.44% CuT from 144m; and
8m @ 0.19% CuT from 176m
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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