70,000 meters completed, highlights include:

349.0 m of 0.77% Cu, including 232.0 m of 0.86% Cu (AZ23292)

382.5 m of 0.54% Cu, including 74.0 m of 0.86% Cu (AZ23277)

TORONTO, May 16, 2024 (GLOBE NEWSWIRE) -- McEwen Copper Inc., 47.7% owned by McEwen Mining Inc. (NYSE: MUX) (TSX: MUX), is pleased to provide the assay results from the currently completed drill season at the Los Azules project in Argentina. The prime objectives of this season’s infill drilling campaign were: 1. to confirm the size and grade of the deposit as compared to the 2023 PEA estimate and upgrade the resource categories for the upcoming feasibility study; 2. test for extensions of mineralization beyond the current pit shell; and 3. explore our large property package for other mineralized areas.

Based on the assay results received to date, our first objective appears to have been met. Initial interpretation suggests that our infill drilling will result in an increase in Measured and Indicated resources and an overall mineral inventory within 5% of the PEA estimate. Testing for extensions beyond the planned pit has successfully encountered mineralization both to the north and to the south. Primary mineralization was intercepted (202.0 m of 0.20% Cu) over 400 meters north of last year’s deep exploration hole, confirming its extension at depth a significant distance to the north. Exploration south of the planned pit has intercepted the principal mineralized intrusive more than 700 meters south of previous drill intercepts and indicates that prospective intrusives continue well to the south of the pit.

Exploration over our property has produced an intriguing target, late in the season. Initial results of a concession-wide regional mapping and sampling campaign have identified strong evidence of a large porphyry system 3 kilometers east of the Los Azules deposit. Porphyry-style veining and quartz vein stockworks with copper oxide mineralization have been recognized within this new target, with assay results pending.

Additionally, this news release covers all results from the first half of the 2023-24 drill program (see Table 1). Final results will be published when all the geochemistry is completed.

The objective of the 2023-2024 drilling campaign is to collect all the necessary information to support the completion of the Los Azules Feasibility Study by early 2025. This information continues to arrive and will be processed in the following months. Resource drilling is focused on converting all the mineralization to be mined in the first 5 years to Measured and Indicated resource, to increase confidence during the payback period. Geotechnical, metallurgical, hydrogeological, exploration, and condemnation drilling are also being performed.

Highlights

Hole AZ23292 returned an intercept of 349 m of 0.77% Cu (approx. true thickness). The Enriched zone portion of this hole extends over 346 meters and includes an intercept of 232 m of 0.86% Cu.
Hole AZ23277 has an intercept of 382.5 m of 0.54% Cu (approx. true thickness). The Enriched zone portion of this hole extends over 306 meters with a grade of 0.61% Cu and includes an intercept of 74 m of 0.86% Cu.
Results

Results are summarized in two schematic cross sections (Figures 2 and 3), which include simplified interpretations of the Overburden, Leached, Enriched and Primary zones. The Enriched mineral zone refers to the enrichment of a copper deposit by precipitation-derived water circulation that carries copper minerals downward through the rocks to accumulate in a thick, often horizontal “blanket”. Immediately above the Enriched zone is the Leached zone, from which copper was removed and transported. Weathering and oxidation often aid in this process. Below the Enriched zone, the Primary (or Hypogene) zone is formed by ascending copper-rich fluids having a much deeper magmatic origin. The green line on the sections indicates the pit floor of the 30-year pit shell from the 2023 NI 43-101 Preliminary Economic Assessment (PEA).

Figure 1 presents a plan view of the location of two sections and the holes reported. Adjacent cross sections are located 50 m apart from each other, starting with the lowest numbered section at the south end of the deposit and progressing to the north.

Figure 1 – Plan View Location of Cross-sections and Drill Holes Reported in this News Release

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