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McEwen Mining: Stock Property Exploration – High-Grade Intersections

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McEwen Mining: Stock Property Exploration – High-Grade Intersections






McEwen Mining Inc. (NYSE: MUX) (TSX: MUX) is pleased to report high-grade exploration drill results (see Table 1) from its 100% owned Stock Property, part of the Black Fox Complex, near Timmins, Canada (see Figure 1).


“When we acquired the Black Fox Complex, we had very limited knowledge about the Stock Property. Our drilling has revealed the presence of a strongly mineralized gold system. Currently, our exploration program is assessing the occurrence of higher-grade gold zones or “shoots” within the wider and lower grade Stock East Deposit, and is generating some of the highest-grade intersections to date. Stock has become a top priority exploration target for us. Stock East’s potential to become an economic deposit is enhanced by the advantage of being strategically located right next to our operating mill,” commented Sylvain Guerard, SVP Exploration.




  • At Stock East, two high-grade drill intersections: 34.7 g/t gold over 5.9 m, including 74.1 g/t gold over 2.7 m, and 83.5 g/t gold over 5.6 m, including 417 g/t gold over 1.1 m, were encountered at a vertical depth of approximately 290 meters.
  • The presence of new high-grade intersections together with previous results strengthens our conviction that the Stock East Deposit hosts higher-grade zones that could potentially be mined using existing nearby underground mine workings (see Figure 2).
  • At Stock Deep, testing for the depth extension of the Stock Mine mineralization has produced a new intersection of 4.2 g/t gold over 7.5 m, including 25.9 g/t gold over 0.8 m. This intersection is 100 meters (330 ft) below the last reported deep intersection of 18 g/t gold over 9.1 m, including 120 g/t gold over 1.3 m (see Sept 4, 2019 news release). These results reinforce our belief that a strong mineralized system is continuing at depth.
  • On the Stock Property, drilling is continuing along the 3 km mine trend with four drill rigs: two rigs are focused on Stock East and two rigs are drilling the western section of the trend. A resource update for the Stock property is planned for year-end.


Table 1 – Selected New Drill Results from Stock Property



HOLE-ID From (m) To (m) Core Length (m) Estimated True Width (m) Gold Grade (g/t) Area
S19-97W1 1090.0 1099.0 9.0 7.47 4.17 Stock Deep
Including 1098.0 1099.0 1.0 0.83 25.90  
SEZ19-28 337.0 343.5 6.5 5.91 34.71 Stock East
Including 339.8 342.5 3.0 2.73 74.13  
SEZ19-35 324.3 330.5 6.2 5.64 83.49 Stock East
Including 325.3 326.5 1.2 1.09 417.00  


Stock East


At Stock East the gold mineralization extends from surface to a depth of approximately 450 m. The initial resource estimate envisioned an open pit mining scenario at Stock East. However, the high-grade intersections encountered suggest the presence of higher-grade shoots within the lower grade resource area (see Figure 3). An infill drill program is ongoing to better assess this higher-grade mineralization.


Stock Deep


Exploration drilling by McEwen Mining in 2018 and 2019 tested the potential of the mineralized system to extend below the lowest levels of the Stock Mine. Production from this mine ceased in 2004 at a relatively shallow depth of only 330 m (1,080 ft). Total production was 137,000 ounces of gold at an average grade of 5.4 g/t Au.


In 2018, hole S18-31 intersected multiple intervals of mineralization up to a depth of 650 m (2,130 ft) below surface under the mine workings. The best intersections from hole S18-31 include:  5.6 g/t Au over 3.3 m, including 14.8 g/t Au over 1.0 m; and 7.0 g/t Au over 3.8 m, including 30.1 g/t Au over 0.8 m; and 3.8 g/t Au over 4.0 m.


During Q2 2019, hole S19-95 intersected mineralization 250 m (820 ft) below the positive 2018 results intersected in hole S18-31, and 950 m below surface.  Multiple zones of alteration and mineralization were observed, including visible gold. The best interval received from this hole is 18.0 g/t Au over 9.1 m, including 120 g/t Au over 1.3 m, including 311 g/t Au over 0.5 m.


A new result of 4.2 g/t gold over 7.5 m, including 25.9 g/t gold over 0.8 m was returned from hole S19-97W1 at a vertical depth of 1,020 m (3,345 ft) (see Figure 2). The gold mineralization is hosted in fuchsite-altered ultramafics, and could potentially represent the depth extension of the historical “N2 Zone” of the Stock Mine, which produced 80,000 oz of gold at an average grade of 6.2 g/t Au.


Property and Geologic Information


The Stock Property is the site of McEwen Mining’s Stock Mill, which currently processes ore from the Black Fox Mine. The mill has a capacity of approximately 2,000 tonnes per day and is currently underutilized. Previously the mill processed ore from the historical underground Stock Mine that was in intermittent production from the early 1980s until 2004.


Known mineralization occurs along the prolific Destor Porcupine Fault (DPF), which crosses the property from West to East over a strike length of approximately 8 km. A significant NE-SW trending fault (the Nighthawk Fault) intersects the DPF near the Stock Mine making the area a prime structural setting for gold mineralization (see Figure 1). In addition to these major structures, the property also exhibits other characteristics of strongly mineralized systems: intense alteration, multi-style and multi-phase mineralization, and significant gold mineralization hosted in various rock types, including wide intersections of 10-30 meters at 1-2 g/t Au, and also higher-grade intersections of +10 g/t Au.


Gold mineralization at the Stock Property consists of disseminated sulfides (mostly pyrite) and quartz-carbonate stockwork and breccia, hosted in sericite-silica-albite and fuchsite altered mafic and ultramafic volcanic rocks, and in highly siliceous and albite-rich dykes.


Figure 1 accompanying this announcement is available at


Figure 2 accompanying this announcement is available at


Figure 3 accompanying this announcement is available at


Complete assay results from the latest drilling on the Stock Property:




McEwen Mining is a diversified gold and silver producer and explorer with operating mines in Nevada, Canada, Mexico and Argentina. It also owns a large copper deposit in Argentina. McEwen’s goal is to create a profitable gold and silver producer focused in the Americas.


McEwen has approximately 362 million shares outstanding. Rob McEwen, Chairman and Chief Owner, owns 22% of the shares.


Posted September 30, 2019

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