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Eastmain Discovers High-Grade Gold-Bearing Vein System on Éléonore South JV Property

Eastmain Resources Inc. is pleased to announce the discovery of a high-grade gold-bearing vein system on the Éléonore South JV Property in the James Bay region of Québec. The discovery is the result of a continued focus within the property's highly prospective exploration corridor since mid-2016 and is situated 15 km SE of Goldcorp Inc.'s Éléonore gold mine (See FIGURES 1-5).

The discovery was confirmed at surface by extensive channel sampling at the Moni prospect, prospect mapping and sampling and overburden stripping, and at depth by drill hole ES16-48 (8.88 g/t Au over 2.50 m, see press release dated November 21, 2016).

Discovery Highlights:

  • A 6 m wide vein system was exposed along a 36 m NE-SW strike length; the system is a quartz-feldspar, intrusion-hosted high-grade gold-bearing vein system; from NE to SW, channel sampling highlights include:
    • Channel C05-05': 24.2 g/t Au over 3.80 m
    • Channel C01 (2016): 79.5 g/t Au over 5.87 m
    • Channel C07: 51.4 g/t Au over 5.30 m
    • Channel C08: 53.8 g/t Au over 4.55 m
    • Channel C08': 40.0 g/t Au over 1.85 m
    • Channel C09: 13.5 g/t Au over 4.80 m
    • Channel C10: 79.6 g/t Au over 4.25 m
    • Channel C11: 28.1 g/t Au over 2.95 m
       
  • Another vein, located about 15 m SE from the vein system described above, returned the following composite intervals:
    • Channel C16: 47.1 g/t Au over 7.70 m
    • Channel C17: 35.6 g/t Au over 1.35 m
       
  • A potential kilometre-scale strike extension to the southwest of this high-grade vein system is supported by:
    • A newly discovered prospect ("the 101 Prospect") that returned up to 101.0 g/t Au from grab samples is located about 400 m SW of the Moni Prospect;
    • A 1,100 m long SW trending gold-arsenic soil anomaly on strike with the Moni and the 101 prospects
    • An interpreted correlation to a NE-SW trending magnetic low
       

Bill McGuinty, Eastmain VP Exploration commented, "Veining at the Moni Prospect, first sampled in 2016, has continued to hold the joint venture's attention over the past year. Greater surface exposure at Moni with some initial drill support and the discovery of the new 101 Prospect defines a clearer exploration axis for this section of the property. We see a potential to continue extending and defining this newly discovered gold system through the project's extensive soil geochemical database and magnetics. We look forward to continued work with our partners to build on this exciting new discovery."

The reported channel sampling is part of the $3.9-million 2017-2018 exploration program which includes 8,000 m of diamond drilling, geochemical and geophysical exploration and prospecting (see press release dated July 20, 2017). Phase 1 of the drilling program is complete with assays pending on 18 holes, totalling 4,443 m, targeting the prospective corridor. Phase 2 is planned for January to March 2018, and will be informed by drill results from Phase 1 drilling as well as the new discovery at the Moni and 101 prospects.

The Moni Prospect

The 2017 channel sampling results were obtained on the Moni Prospect following mechanical stripping that significantly enlarged previous exposures (see press release dated November 3, 2016). Seventeen regularly spaced channels (13 new and two 2016 channels expanded) were cut across vein strike. Eighty-two samples with a cumulative length of 64.95 m were obtained from newly exposed outcrop. True widths may range from 70% to 100% of apparent widths at surface. Reported gold values are uncut. All channel samples have been individually described and preliminary mapping of the stripped outcrop has been completed. Individual sample and averaged channel sample interval results are presented in FIGURES 2 and 3 respectively.

Key features can be summarized as follows:

  • The high-grade gold vein system is related to a network of quartz-feldspar veins and veinlets hosted in strongly altered tonalite. The mineralized facies vary laterally from grey or black, generally coarse-grained quartz veins to quartzo-feldspathic pegmatite textured veins with trace to 1-2% sulphides (mostly arsenopyrite with lesser pyrite, pyrrhotite). Small amounts of tourmaline and scheelite are present. Alteration minerals are silica, albite, biotite and chlorite.
     
  • 345 visible gold grains were located in 42 of the 82 channel samples.
     
  • The tonalite is pervasively altered (albite, silica) and displays a network of quartz and veinlets with feldspathic selvages (sheeted veins).
     
  • The NE-SW-trending gold-bearing system is deformed with some evidence of folding. The vein system appears roughly parallel to the steeply dipping foliation trend.
     

All significant channel results from the Moni Prospect are presented below. These results include channels C01, C02, C03 and C04, which were sampled in 2016. Several channels terminate in mineralization where it meets overburden, warranting further stripping.

The composite mineralized results for the main vein system are as follows, from NE to SW:

Channel C05-05' 24.2 g/t Au over 3.80 m
Channel C01 79.5 g/t Au over 5.87 m Sampled in 2016, extended in 2017
Channel C02 7.85 g/t Au over 3.40 m Sampled in 2016
Channel C07 51.4 g/t Au over 5.30 m
Channel C08 53.8 g/t Au over 4.55 m Open to the NW (limited by overburden)
Channel C08' 40.0 g/t Au over 1.85 m
Channel C09 13.5 g/t Au over 4.80 m
Channel C10 79.6 g/t Au over 4.25 m
Channel C11 28.1 g/t Au over 2.95 m Open to the NW (limited by overburden)
Channel C12 26.40 g/t Au over 0.90 m Open to the NW (limited by overburden)
Channel C13 12.70 g/t Au over 0.90 m Open to the NW (limited by overburden)
Channel C14 12.95 g/t Au over 0.60 m Open to the NW (limited by overburden)
Channel C15 16.60 g/t Au over 0.75 m Open to the NW (limited by overburden)

The lateral high-grade vein, for which the geometry and possible link to the main vein are not yet fully understood, yielded the following composite channel results:

Channel C17: 35.6 g/t Au over 1.35 m Open to the NW (limited by overburden)
Channel C16: 47.1 g/t Au over 7.70 m
Channel C03: 49.2 g/t Au over 4.00 m Sampled in 2016, extended in 2017
Channel C04: 50.37 g/t Au over 3.50 m Sampled in 2016

101 Prospect

Partial results from prospecting have led to the discovery of the 101 Prospect, which returned 101.0 g/t Au in a grab sample. Preliminary field observations indicate tonalite-hosted grey to black quartz centimetre-scale veins with feldspar and visible gold striking NE-SW. The showing is located 400 m southwest of the Moni Prospect and may represent its strike extension. Additional prospecting in this area is underway, as well as detailed soil geochemistry.

Exploration Potential

Exploration work since mid-2016 has focused on a NE-SW trending, 4 km long by 0.5 km wide gold-bearing prospective corridor related to a hydrothermally-altered tonalite intrusion and its contact with metasediments. At Éléonore South, the primary targets are interpreted to be part of a late-magmatic hydrothermal system related to the tonalite intrusion. In this geological environment, the surrounding metasediments may also constitute potential targets depending on favourable lithological and structural settings. Specifically, the two tonalite hosted gold mineralization types are interpreted as:

  • Tonalite-hosted high-grade gold-bearing quartz and quartzo-feldspathic vein system (Moni trend)
  • Tonalite-hosted kilometre-scale zones of considerable width characterized by a quartz-albite-biotite stockwork with a variable density of quartz-albite veinlets, small amounts of disseminated sulphides (arsenopyrite, pyrite, pyrrhotite) and frequent visible gold grains

For reference, the nearby Éléonore mine is a sediment-hosted gold deposit. High-grade quartz-feldspar-arsenopyrite-pyrrhotite veins with visible gold that grade into pegmatitic material have been described in the mine. Of particular interest, the pegmatite at the mine is the same age as the known tonalite on the Éléonore South Property (2.62 billion years).

Source: http://www.eastmain.com/

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