The McClarty Lake property is favourably situated within the Flin Flon - Snow Lake greenstone belt, one of the largest Proterozoic volcanic-hosted massive sulphide (VMS) districts in the world. Twenty-seven copper-zinc-(gold) deposits within the belt have produced more than 183 million tonnes of sulphide ore.
Previous Work (1996-2010)
Early exploration on the property was hampered by lack of outcrop exposure and overlying Paleozoic-aged sediment cover. An electromagnetic ("EM") conductor detected in 1996 was tested by two diamond drill holes in 1997 by HudBay and two holes in 2000 (MC01 and MC02) by Troymet's predecessor company (Table 1). All four holes intersected a gold and silver bearing semi-massive pyrite horizon in altered felsic volcanics, tracing the horizon over a 50 metre strike length and to 50 metres depth. A deep penetrating Time Domain EM (TEM) survey undertaken in 2002 subsequently defined a potential massive sulphide horizon(s) over a strike length of ~600 metres. Plans to test the conductor were shelved in 2004 and 2005 because of the lack of drill availability, and in 2006 by poor ice conditions.
Five holes drilled in 2007 extended the strike of the sulphide horizon to over 425 metres (open) and to a vertical depth of 250 metres (open). Significant zinc sulphide mineralization (up to 20% sphalerite) within the semi- to massive pyrite horizon was intersected in two holes (MC07-04* & MC07-06*) collared 225 metres south of the 1997/2000 drilling (Table 1). Along with the presence of copper sulphide (chalcopyrite), this marked the first discovery of significant base metal mineralization on the property.
Troymet contracted GEOTECH Ltd. in 2008 to perform a helicopter-borne VTEM survey over the entire McClarty Lake property. Eight holes drilled that winter identified two laterally continuous zones of massive sulphides within a steeply NE-dipping sequence of felsic metavolcanic rocks. The lower zone was confirmed over a strike length of 75 metres and to a vertical depth of 175 metres.
The massive sulphide horizons are hosted by a sequence of variably silicified, sericititized and chloritized felsic volcanics and volcaniclastics. The volcanic sequence exhibits a distinctive coarse-grained (porphyroblastic) metamorphic mineral assemblage that is recognized in all of the VMS deposits in the Snow Lake area, and reflects an earlier hydrothermal event that has been overprinted by amphibolite-grade regional metamorphism. The alteration assemblage is considered a highly important exploration vector to massive sulphide mineralization.
The alteration system associated with the massive sulphides has been traced laterally for ~500 metres. The high-grade nature of the mineralization and extensive alteration confirms the potential for the mineralizing system to host a precious metal rich VMS deposit(s). The sulphide mineralization and associated alteration system at McClarty Lake is very similar to that associated with the Chisel Lake and Lalor Lake volcanogenic massive sulphide deposits of the Snow Lake area.
HudBay indicated its intent to earn an additional 20% interest in the option claims by conducting a 2010 winter drilling program on the Discovery zone and other untested targets. After completing a ground EM survey over the target area in February 2010, unseasonably warm weather conditions affected lake ice conditions in the region, preventing HudBay from conducting the drilling portion of its program.
On its 100% owned claims, Troymet also planned a 2010 winter drill program to evaluate the Mac EM conductor, which lies on trend and ~1000 metres northeast of the Discovery zone. The Mac conductor was identified by the 2008 VTEM helicopter-borne survey in an area with no record of prior drilling. A pulse electromagnetic (PEM) survey undertaken by Crone Geophysics identified a strong bedrock conductor on the southwest edge of the grid. Troymet secured a drilling contractor; however, due to the warm spring conditions in Manitoba the Province implemented an early spring road restriction that banned heavy loads on specific roads, which prohibited the mobilization of drilling equipment to the property.
Joint Venture Claims
Hole MCC001, drilled on section with 2008 holes MC08-08, 10 and 11, intersected the mineralized zone ~150 metres below the intersection in hole MC08-10 at a vertical depth of ~300 metres. A wide zone of mineralization comprising a mix of massive, semi-massive and disseminated sulphide was intersected from 293.6 to 404.0 metres (Table 1). Holes MCC002 and MCC003 were drilled on section with hole MC08-09. These holes were drilled on the north side of an interpreted fault that offsets the mineralization, to test an off-hole geophysical anomaly. Neither hole intersected significant mineralization, although a wide zone of mineralized schist (1 to 7% disseminated pyrite with rare chalcopyrite) was intersected in MCC002 from 323.85 to 493.0 metres including an intersection of massive pyrite from 418.9 to 419.9 metres. Hole MCC003 also intersected a wide zone of mineralized schist (trace to 25% disseminated pyrite > pyrrhotite) from 365.5 to 549.6 metres, with massive to semi-massive pyrite intersected from 393.1 to 393.6 metres and 545.7 to 546.9 metres.
In winter 2013, Hudbay drilled a single hole to test for the down dip and southward strike continuation of the Discovery Zone. The hole was shut down prematurely at 437 metres depth due to concerns of unsafe ice conditions. Hudbay reported that sulphide bearing biotite-quartz-garnet-amphibole-kyanite-cordierite-sericite gneisses and schists were intersected from 280 to 437 metres down hole. The main sulphide mineralization, consisting of predominantly pyrite (5-25%) and minor pyrrhotite, was intersected over a 52 metre interval from 346 to 398 metres down hole. A second 5 metre interval with 3-5% pyrite and minor pyrrhotite was intersected from 423 to 428 metres down hole. No significant copper, lead, zinc, gold or silver values were reported.
Table 1. 1997 - 2011 Diamond Drilling Highlights
* MC07-03 formerly designated as SIG-01-07; MC07-04 formerly SIG-02-07; MC07-05 formerly SIG-03-07; MC07-06 formerly SIG-04-07; MC07-07 formerly SIG-05-07. All holes were drilled at 291º azimuth and -55º dip. Widths represent down hole core lengths. True widths for the lower zone are estimated at 85% of core length. True widths for the upper zone cannot be reliably estimated at this time.
Troymet (100%) Claims
Drill hole MAC-11-01 intersected an intrusive margin complex that is described as a heterogeneous zone characterized by xenoliths (remnant rafts) of mafic volcanics and minor metasediments within a granitic to tonalitic intrusion. Several 1-2 metre wide pyritic zones (3-5% pyrite ± graphite ± quartz veining) hosted within volcanic xenoliths returned anomalous copper values up to 0.12% Cu.
Drill hole MAC-11-02 intersected a felsic volcanic horizon that hosts a number of 1- 4 metre wide, finely laminated pyritic zones containing up to 15% pyrite ± graphite, returning anomalous copper (up to 294 ppm) and zinc (up to 196 ppm). The hole also intersected xenolithic tonalite intrusive, characterized by xenoliths of mafic volcanics and zones of strong sulphide replacement. The 1- 2 metre wide sulphidic zones host up to 10% pyrite, 30% pyrrhotite and <1% chalcopyrite, returning anomalous copper and zinc values up to 0.10% Cu and 361 ppm Zn.
Drill hole MAC-11-03 intersected xenolithic granodiorite intrusive that is characterized as hosting abundant volcanic xenoliths and zones of strong sulphide replacement. The 2-3 metre wide sulphidic zones host up to 20% pyrite, <1% sphalerite and trace chalcopyrite, returning anomalous copper and zinc values up to 281 ppm Cu and 0.43% Zn.
The altered volcanic xenoliths and strongly sulphidized zones are reminiscent of the volcanic horizon that hosts the Discovery zone, and may represent a northern extension of that horizon. The dominance of xenoliths and sulphidized zones within the various intrusive bodies suggests that the volcanic horizon, where intersected, has been partially digested. There is potential for uninterrupted extensions of the mineralized volcanics along strike and to depth. The results are significant, as they indicate the possibility a +2 kilometre long stratigraphic horizon that carries base metal mineralization in the two locales, where tested.Further details are provided in the Company's April 11, 2011 news release.
Given the absence of outcrop in this region of the Snow Lake camp, the location and orientation of initial drill holes were based entirely on the interpretation of various geophysical surveys. A review of the PEM survey with representatives of Crone Geophysics concluded that the orientation of the PEM survey was not optimal, and that a survey of the VTEM conductor trend from loops laid out east of the trend could identify additional conductors along the productive horizon. The PEM conductor/Mac zone remains open to the north and south, as well as to depth. Further PEM surveys and diamond drilling are required to adequately explore the Mac mineralized zone.
In 2015, HudBay completed a compilation and review of all the technical data for the joint venture claims. This work resulted in the identification of new targets and the subsequent staking of three new mineral claims which adjoin both the joint venture claims and claims owned 100% by Troymet. Two of the new targets occur near the boundary between joint venture claims and 100% owned Troymet claims. Hudbay is planning ground geophysical surveys over the newly identified exploration targets.
Troymet considers that the McClarty Lake is a property of substantial merit with excellent discovery potential for a precious metal rich VMS deposit(s).
Results from the 2008 program are presented in a NI 43-101 technical report (available below) entitled "2008 Technical (NI 43-101) Report on the McClarty Lake Property", dated June 11, 2008 by Rory Kutluoglu, B.Sc. (Equity Engineering Ltd.) and qualified person, Alan H. Bailes, Ph.D., P.Geo. (Bailes Geoscience).
© 2007 Troymet Exploration Corp. All Rights Reserved.