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Permit 915 (Tasiat Permit)

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Permit 915 (Tasiat Permit) GM 52253 PERMIT 915 (TASIAT PERMIT) h)~f, QE ~{': 6 fSrr} COMINCO LTD. ïll'E~E :93 4CT EXPLORATION 26 TO MSTERN CANADA PERMIT 915 (TASIAT PERMIT) UNGAVA PENINSULA, NORTHERN QUEBEC LAT: 59°O1' - 59°15' LONG: 73°46' - 75°02' OCTOBER 1993 V. GROSL MER - S.I.S.E.M. 1994/02/17 GM 52253 93 299 012 , TABLE OF CONTENTS 1. Summary 1 2. Location and Access 1 3. Tenure 2 4. Previous Work 2 5. Work Performed 2 6. Regional Geology 2 7. Local Geology 3 8. Structure 3 9. Mineralization and Alteration 4 10. Finance 4 11. Conclusions and Recommendations 4 12. References 4 LIST OF ATTACHMENTS 1. Location Map 2a. Geology 34-0-2 - Scale 1:50,000 2b. Geology 34-0-3 - Scale 1:50,000 3a. Geochemistry (Stream and Soil) 34-0-2 - Scale 1:50,000 3b. Geochemistry (Stream and Soll) 34-0-3 - Scale 1:50,000 Statement of Expenditures LIST OF TABLES 1. Rock Analyses 2. Stream and Soil Analyses COMINCO LTD. EXPLORATION EASTERN CANADA PERMIT 915 (TASIAT PERMIT) 1993 ASSESSMENT REPORT OCTOBER 1993 V. GROSL 1. Summary The Tasiat permit, covering an area of 153.6km2 is located immediately to the north of the Kogaluk permit, on the Ungava Peninsula, Northern Quebec. As part of a 50/50 joint venture between SOQUEM and Cominco Ltd. the permit was obtained in 1992 as a result of the reconnaissance program in the Minto geological subprovince. Work in 1993 was carried out from a fly camp located on the northeastern shore of Tasiat Lake and consisted of geological mapping on a scale of 1:50,000, prospecting, and rock and soil geochemical sampling. The Tasiat permit is underlain by a supracrustal metasedimentary assemblages with about 10% mafic volcanic rocks. Younger tonalite intrusions are present in the centre of the area covered by 1993 work and on eastern and western margins of the belt. The grade of metamorphism varies from greenschist to upper amphibolite. The structure of the belt is complex, controlled by the tonalite intrusions. Mineralization, consisting of 2-5% pyrite and pyrrhotite, was found in two areas in mafic volcanic rocks. A small arsenopyrite occurrence hosted by plagioclase-biotite schist at contact with quartzite was located on the south shore of Tasiat Lake. No significant base metal values were obtained from rock samples. Chip sample from the arsenopyrite occurrence returned 455ppb Au over 50cm width. Soil samples returned background values. It is recommended that detailed mapping and prospecting be carried out in the areas south of Tasiat Lake where no work was conducted in 1993 due to access difficulties. It is recommended that 68km2 of the original permit be retained. 2. Location and Access The Tasiat permit is located immediately to the north of Kogaluk permit, between latitude 59°01' to 59°15' and longitude 73°46' to 75°02'. The permit occupies portions of NTS blocks 34-0-2 and 34-0-3. The logistics on this permit were the same as for the Kogaluk permit. 2 3. Tenure The Tasiat permit covers an area of 153.6km2 and is part of the 50/50 Cominco/Soquem joint venture. The expenditure requirements for 1993 are $32,729. The permit areas are shown on plates 2a and 2b. 4. Previous Work 1961-63 Geological Survey of Canada reconnaissance mapping (scale 1:1,000.000) by Stevenson,I.M. (characterized the Ungava Peninsula as largely high grade metamorphic and plutonic terrane). 1980's GSC colour airmagnetic anomaly maps of Ungava Peninsula. 1989-1991 Geological Survey of Canada geological mapping by Percival,J.A. (identified well preserved greenstone belts within the magnetic lows). 1992 Cominco Ltd.-Soquem joint venture program consisting of air photo interpretation, geophysical and landsat images interpretation, aerial reconnaissance prospecting, geological mapping, prospecting, rock sampling and data interpretation. 5. Work Performed Field work on Tasiat permit was carried out between August 5 to August 11, 1993 by the crew that worked on the Kogaluk permit. Work consisted of geological mapping (scale 1:50.000), prospecting rock and stream silt and soil sampling. Samples were analyzed for Cu,Pb,Zn,Ag,Au. Whole rock analysis and geochronological work are in progress (T. Skulski, G.S.C.). 6. Regional Geology The Minto area is part of the Goudalie lithotectonic terrane as described by Percival et al (1991). The Goudalie terrane is comprised of biotite and hornblende tonalite and tonalitic gneisses, with lesser paragneisses and metavolcanic rocks. Diabase dykes oriented WNW cross cut all other lithologies except for later granitic veins (Percival et al, 1991). Metasediments and metavolcanic rocks form NNW-oriented belts ranging from 1 to 8km wide and 10's of km in length. These belts are commonly intruded by granitoid plutons which have an ovoid shape and generally occupy the centre of medium sized lakes. The areas between the greenstone belts or septae are characterized by granulite facies magnetite- bearing granodiorite and gneiss. 3 The metamorphic grade of the supracrustals generally varies from greenschist facies (chlorite-epidote assemblage) to upper amphibolite facies (garnet-cordierite-sillimanite-biotite assemblage). The orientation of the foliation as defined by mafic minerals (biotite and hornblende mainly) is generally belt parallel at N350. Most of the supracrustal rocks describe a dome and basin tectonic regime possibly related to multiple phases of deformation. The Goudalie terrane has many of the characteristics of granite-greenstone terranes of the southern Superior Province (Percival et al, 1991). The Goudalie terrane is in contact to the west with the Minto Lake terrane which is characterized by orthopyroxene-bearing diatexite and granite, and to the east with the Utsalik terrane composed mainly of distinctive orthopyroxene and hornblende-bearing granite and granodiorite. Both the eastern and western contacts of the Goudalie terrane are gradational. 7. Local Geology The Tasiat permit is underlain by the mafic metavolcanic and metasedimentary schists which outcrop pattern is controlled by the younger semicircular granitoid intrusive complexes that underly Lac Tasiat. The supracrustals are represented predominantly by plagioclase-biotite schist with interbeds of metric-scale garnet-sillimanite-quartz-feldspar-biotite schist. Thin bands of mafic schist make up about 10% of the supracrustals and are probably representing mafic volcanic tuffs and/or flows and argillites. In some areas mafic rocks are epidotized and silicified over 2- 5m widths. Younger tonalite intrusives are found in the centre of the belt and along eastern and western margins. Pegmatoid intrusives of 10- 50m thickness occur mainly in the eastern portion of the belt. An E-W trending Proterozoic-age diabase dyke approximately 200m thick is mapped in the centre of the permit. Metamorphic grade is greenschist to upper amphibolite. 8. Structure Generally the trend of the stratigraphy is northeasterly, but deviations in easterly direction due to the granitoid intrusions in the centre of the permit are significant. Bedding dips are from vertical to 20-30°NW in central portion of the permit. Isoclinal folding is present in the NW limits of the belt. 9. Mineralization and Alteration Ankerite-silica alteration was found in the mafic schist in northwestern portion of the belt. Orange weathering ankerite criss-crossing mafic schist occurs over 1 by 10 metre areas. No 4 sulphides were associated with this alteration. Two small gossans hosted by the mafic schist were found in the northeastern and northwestern portion of the belt. Gossan #1 is a one by three metre wide zone composed of amphibole-biotite-feldspar and 5% pyrite, which occurs as specks and stringers. Chemical analyses returned values of 532, 54, 102, <1 ppm Cu, Pb, Zn, Ag respectively and 111 ppb Au. Gossan #2 is a one by 5 metre large area composed of amphibole-biotite-plagioclase with thin quartz veins and 2% disseminated pyrite. Chip samples returned values of 88, 64, 80, <1 ppm Cu, Pb, Zn, Ag respectively and 40 ppb Au. A small arsenopyrite-pyrite occurrence was located in the centre of the permit to the south of Tasiat Lake. It is hosted by an intermediate tuff 5-6m wide near the contact with biotite- plagioclase schist. Chip sample from this location returned values of 276, 44, 40, <1 ppm Cu, Pb, Zn, Ag, respectively and 455 ppb Au over 50cm width. A grab sample carried 1,740 ppb Au. 10. Finance A total of $32,729 was expended on the permit to date. Statement of expenditures is attached. 11. Conclusions and Recommendations The 1993 work outlined in more detail areas of supracrustal rocks and located a few small pyrite and one arsenopyrite occurrence. No significant sulphide mineralization was detected in the areas covered in 1993, however a sizeable portion of the permit, where 1992 prospecting detected a small sphalerite occurrence was not covered by 1993 work due to difficult access. It is recommended that helicopter-supported geological mapping, prospecting and geochemical sampling be carried out in this area in 1994. It is also recommended that 68km2 be retained. 12. References FRANKLIN, J.M., SANGSTER, D.M., AND LYDON, J.W., 1981: Volcanic Associated Massive Sulphide Deposits: in SEG Seventy-Fifth Anniversary Volume, Skinner, B.J. ed. p.485-627. 5 GOVETT, G.J.S. and NICHOL, I., 1979: Lithogeochemistry in mineral exploration. In: Geophysics and geochemistry in the Search for Metallic Ore (editor P.J. Hood). Geol. Survey Canada, report 31. MCLEOD, J.A., 1992, Minto-Vizien Sections: Cominco internal report. MOORE, D.W., 1992, Minto-Vizien 1992 Year End Report, Cominco internal report. PERCIVAL, J.A., CARD, K.D., STERN, R.A., and BEGIN, N.J., 1990: A geological transect of northeastern Superior Province, Ungava Peninsula, Quebec: The Lake Minto area: in Current Research, Part C, Geological Survey of Canada, Paper 90-1C, p.
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