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Renforth Resources Inc (2)
Symbol RFR
Shares Issued 106,310,829
Close 2018-02-27 C$ 0.045
Market Cap C$ 4,783,987
Recent Sedar Documents

Renforth finds visible gold in New Alger samples

2018-02-28 11:17 ET - News Release

Ms. Nicole Brewster reports

VISIBLE FREE GOLD IN THIN-SECTION FROM RENFORTH'S DISCOVERY VEIN

During Renforth Resources Inc.'s recently completed thin-section petrographical work on the Discovery veins at New Alger, several grains of visible free gold have been identified.

Petrography study findings:

  • Presence of free gold proven in Discovery veins;
  • Discovery vein system is pegmatitic and located in the Pontiac sediments, a similar setting to the Canadian Malartic mine, approximately 25 kilometres east;
  • Discovery vein system is genetically similar to Thompson-Cadillac mine area veins;
  • Petrographic observations gave a composition dominated by brown to green tourmaline identified as a low iron dravite in association with potassic feldspar, aluminous silicates (sillimanite and cordierite) and biotite.

"The petrographic study is an important step which gives us a deposit model and a project comparison in that New Alger, with the characteristics and setting of the Discovery veins in the Pontiac, similar to gold zones of the Canadian Malartic mine according to literature. Having a deposit model will inform our future exploration as we continue to develop this property," stated Nicole Brewster, president and chief executive officer of Renforth.

The purpose of this petrographic study was to better understand the gold environment at the Discovery veins and to make a comparison with the Thompson-Cadillac mine area gold mineralization. The Pontiac northern contact corresponds to the Cadillac fault footwall. About 25 kilometres eastward from the New Alger property, a similar environment hosts the Canadian Malartic deposit. The thin-section study was done on five representative slab samples taken from Discovery vein channel sample locations.

Discovery vein context

Recent stripping uncovered the Discovery vein system over a strike length of about 230 metres inside a tightly folded subvertical deformation zone hosted in Pontiac group sediments. The grey-blue-quartz parallel ribbons package observed at surface has an apparent thickness of one to five metres. The Discovery fault, transecting the Discovery vein with a northwest orientation, is suspected to control vein thickening and gold enrichment. Historic trenches located immediately west of the fault revealed veining swell related to tectonic brecciation.

Visible free gold sample DISC-01

This sample was taken adjacent to a channel sample grading 0.32 gram per tonne gold over one metre comprising of laminated quartz. Gold grains measuring 20 micrometres to 30 micrometres were observed in the sample centred on a centimetric vein controlled by a bedding joint. The surrounding wacke is weakly deformed but bleached by feldspathic alteration over a metric interval. Gold grains are free, located on quartz-chlorite-grain joints in association with pyrrhotite. This observation is preliminary but suggests that a part of the gold grade may be relatively coarse and free from sulphide attachment.

Petrographic observation overview

  • The sedimentary hostrock has recorded a polyphased alteration that followed the prograde-retrograde metamorphic cycle. Gold deposition occurs with disseminated early prograde arsenopyrite mineralization and free gold particles are associated with late retrograde chlorite.
  • Field mapping had already identified schistosed green shear zone following a general east-to-northeast orientation subparallel to pegmatitic veins. Petrographic observations gave a composition dominated by brown to green tourmaline identified as a low iron dravite in association with aluminous silicates (sillimanite and cordierite). Dravite is a tourmaline type commonly observed and used as an indicator mineral for gold deposits in metamorphic terrains.
  • The sillimanite and cordierite assemblage is a standard combination of indicator minerals used to support the identification of amphibolite metamorphic facies limits on a map.
  • Potassic feldspar replacement is the main alteration event observed close to veins, taking the form of an erasure of primary structures and mineral assemblages by a fine-to-coarse granular potassic feldspar. Late tectonic unoriented biotite is the other event observed in all samples, crosscutting all predecessor fabrics (bedding and foliation). Finally, the chlorite and biotite assemblage, typical of lower greenschist metamorphic conditions, affects predecessor minerals, being mainly located in microstructures: shear bands, pressure-solution joints and fractures.

Similarity to Thompson-Cadillac mine area

The vein system is pegmatitic, that is, showing a coarse, generally unoriented crystallization structure composed of quartz, potassic feldspar, biotite and aluminum silicates identified as cordierite and tourmaline.

These vein types were described during previous drill programs on the Thompson-Cadillac deposit, and probably mined historically. Their identification on Discovery has created a genetic link with the Thompson-Cadillac gold deposit and informs an exploration target located in the Pontiac. Publications about the Canadian Malartic mine veins note, similar to the Discovery veins, gold-bearing veins hosted in the Pontiac group with a pegmatitic habit.

More widely, the interpretation of this crystallization texture interferes with partial fusion of sediment by the progression of high-metamorphic-grade conditions at depth. The company thinks that the identification of pegmatitic veins is a proximity indicator of a metamorphic front. This concept was recently highlighted in scientific literature as an important control to consider in the exploration for orogenic gold deposits.

Impact on exploration

The Thompson-Cadillac deposit is located 200 m to 250 m north of the Discovery vein. Different generations of dikes (diorite, feldspar porphyry) were intercepted by drilling at mid-distance between both. A strong arsenopyrite occurrence in hole REN-10-04 and the evidence of potassic feldspar-biotite alteration in sediments are other strong indicators supporting the expansion of the gold-system signature southward, inside the Pontiac environment. This field model can be compared with the environment surrounding the Lapa mine and farther east to the Canadian Malartic mine, where gold systems were identified 500 m and almost one km south of the Cadillac fault zone in the Pontiac sediments, respectively.

Petrographic observations made a clear statement about the relation between the Discovery vein gold system and a strong potassic alteration associated with arsenopyrite and dravite-type tourmaline. Recent channel sampling has demonstrated the general gold enrichment in this environment as above 0.1 g/t gold. Alteration signature and potential gold enrichment of tourmaline-schist units strongly advocate for gold mineralization synchronous with deformation. The potential extension of these indicators beyond the gold-bearing-vein system and the possible detection with geophysical or geochemical methods could provide an efficient tracking tool for the gold system.

The observation of free gold grains in conjunction with late-fracture-related chlorite-biotite supports the observation made in the field between gold-enrichment trends and northwest detachment faults. Once combined with geophysical interpretation, this field relation can be applied to extrapolate targets to a distance of about 1.5 km northward, crossing the Thompson-Cadillac deposit.

Disclosure

Information in this press release is based upon visual observations through an optical microscope of a limited group of samples. Mineral idensitication disclosed used state-of-the-art optical-minerology methods, Results obtained can include uncertianty at some levels. This work has to be considered preliminary and subject to further validation.

Martin Demers, PGeo, OGQ, is a qualified person pursuant to the guidelines of National Instrument 43-101 and has reviewed and approved the technical disclosure in this press release.

Renforth will be exhibiting on Tuesday, March 6, and Wednesday, March 7, 2018, at the Prospectors and Developers Association of Canada (PDAC) annual convention in booth No. 2223B where the company will have examples of core from Parbec, New Alger and channel-sample material from the Discovery veins at New Alger which you are welcome to come and see.

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