1
Figure 3. Residual aeromagnec map of NTS 23J/02 illustrang the coincidence of late granite plutons and strong posive magnec signatures (aer Miles and Oneschuk, 2013) Figure 1. Simplified regional geological compilaon of the northern part of the Ashuanipi Complex in western Labrador (modified aer van Nostrand, 2017b). The late-stage granite plutons (Unit Agr) may have the potenal to host structurally-controlled gold and base metal mineralizaon associated with late stage faults. Pre- to posectonic pegmate is a ubiquitous rock type in the region and locally contain anomalous Th, U, REE's and local elevated gold (see Figure 2) Figure 2. Geological compilaon of NTS 23J/02 showing rock sample assays from granite and late stage pegmate. The granite pluton is transected by a southeast-striking brile to ducle fault zone and local mineralizaon with associated elevated gold and base metal assays appears to be, in part, structurally-controlled. Syn- to posectonic pegmate occurs throughout the region and many of these veins have anomalous Th, U and REE's and locally slightly elevated gold. Geology aer van Nostrand and Broughm (2017) and rock assay values are from van Nostrand (2017b). References: Miles, W. and Oneschuk, D. 2013: Schefferville - Mistasin Batholith, QC-NL Aeromagnec Compilaon, Parts of NTS 13, 14, 23 and 24, Quebec and Newfoundland and Labrador, Geological Survey of Canada, Open File 7459, scale 1:500 000. van Nostrand, T.S. and Broughm, S. 2017: Geology of the Ashuanipi Complex, western Labrador (NTS Map Sheets 23J/02, 03 and part of 23J/04) in Current Research, Newfoundland and Labrador Department of Natural Resources, Geological Survey, Report 17-1, pages 61-86. van Nostrand,T.S. 2017a: Geochemical data from the Archean Ashuanipi Complex, western Labrador (NTS map sheets 23J/02, 03, 04, 05, 06, 07, 10,11 and 14. Government of Newfoundland and Labrador, Department of Natural Resources, Geological Survey, Open File 023J/0396, 10 pages. van Nostrand, T.S 2017b: Regional compilaon of the northern Archean Ashuanipi Complex, Superior Province, western Labrador, NTS map areas 23J/02, 03, 04, 05, 06, 07, 10, 11, 14 and 23O/3. Mineral Resources Review 2017 poster, Regional Mapping Secon 23J/02 0 2 6 4 Km 0 66 31' W 0 67 00' W 0 54 00' N 0 54 15' N Menihek Lake River McPhadyen 21979 1030 629 456 354 275 214 160 115 76 40 9 -17 -42 -66 -89 -112 -136 -158 -182 -205 -229 -256 -281 -308 -338 -370 -406 -451 -519 -669 -3407 nT 0 66 30' W 0 54 00' N 0 54 15' N 0 67 00' W Menihek Lake River McPhadyen ä 94 90 ¹ È ¹ È ¹ ¹ ¹ È ¹ ¹ ¹ ¹ ¹ È È È È È ¹ ¹ È È È ¹ ¹ ¹ È ¹ ¹ ¹ ¹ ¹ È ¹ ¹ ¹ È ¹ ¹ ¹ ¹ ¹ ¹ ¹ È ¹ ¹ È È ¹ ¹ ¹ ¹ ¹ ¹ ¹ ¹ ¹ È ¹ ¹ ¹ ¹ ¹ ¹ ¹ ¹ ¹ ¹ ¹ ¹ È ¹ ¹ ¹ ¹ È ¹ ¹ È È È È ¹ ¹ ¹ ¹ ¹ È È Â Â Â ¹ ¹ È ¹ ¹ È È ¹ ¹ ¹ ¹ ¹ ¹ È ¹ È ¹ È È ¹ È ¹ È È È ¹ ¹ ¹ ¹ ¹ ¹ È È É é ¹  ¹ ¹ } ¹ ¹ È ¹ ¹ È ¹ ¹ ¹ ¹ È È È ¹ ¹ ¹ ¹ ¹ È ¹ ¹ È È È È È È ¹ ¹ ¹ ¹ È ¹ ¹ ¹ ¹ ¹ È ¹ ¹ ¹ ¹ ¹ ð ð ¹ o o 50 75 75 76 65 50 48 62 50 80 60 50 25 20 75 32 25 80 55 63 65 50 85 50 50 70 60 65 42 40 40 72 65 60 78 75 80 64 70 75 75 80 80 70 84 80 70 70 70 78 55 60 80 80 62 70 75 55 10 10 65 34 40 60 72 70 75 75 50 70 74 75 62 75 75 70 85 80 88 70 70 70 80 85 86 65 72 70 65 70 75 75 85 74 62 68 88 40 60 74 86 80 80 74 80 78 84 65 33 85 84 80 77 70 80 70 80 60 75 64 40 60 70 50 50 50 75 75 70 60 77 70 65 80 50 75 84 80 85 78 75 65 85 56 78 85 72 60 75 60 73 65 77 64 70 Apx,gb,pg Apx,gb Agb Agr Agr Agr Atgn Adxhg Adxhg Adxhg Adxhg Adxhg Atgn Atgn Atgn Atgn Adi Apgn Apgn Apgn Apgn Apgn Apgn Apgn Apgn Apgn Apgn Agb Agb Agb P gb 2 Pt 1 Pw 1 Pw 1 Pw 1 Pt 1 Pt 1 Agb Agb Agb Agb 1 Atgn Atgn Atgn P gb 2 P gb 2 Atgn Apx,gb 1 Agb,px Apx E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E EE E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E 19 ppb Au 390 ppm Cu 207 ppb Au 1010 ppm As 305 ppm Cu 115 ppb Au 2170 ppm As 818 ppm W 975 ppm Th 1270 ppm Ce 2320 ppm Th 3150 ppm Ce 1400 ppm La 3880 ppm Zr 1980 ppm Ce 740 ppm La 925 ppm Zr 300 ppm Ce 190 ppm Th 100 ppm W 100 ppm Mo 2990 ppm Zr 590 ppm Th 795 ppm Ce 2820 ppm Th 2140 ppm La 4720 ppm Ce 4500 ppm Zr 1992 ppm Nd 224 ppm Pb 72 ppm U 24 ppm Mo 18 ppb Au 327 ppm Cu 9 ppb Au 684 ppm Cu (granite vein) 0 2 6 4 Km + Gabbro dyke. Garnet-dominant diatexite Adxhg Agr P gb 2 Pt 1 Paleoproterozoic Neoproterozoic ? Archean (Ashuanipi Complex) New Quebec Orogen (Labrador Trough) Layered pyroxenite Diorite to quartz diorite. Gabbro. Migmatitic paragneiss Gneissosity Data Station Foliation Igneous layering Syncline Anticline F Fold axis 2 Fault Geological contact Unconformity MODS Occurrence New sulphide indication Gossan zone in late granite Radioactive indication in pegmatite Granite assay Pegmatite assay Tonalite to diorite gneiss Atgn Apgn Apx Sedimentary and igneous rocks Biotite ± hornblende granite Agb Adi ¹ ð È 115 ppb Au 925 ppm Zr  23J/02 FIGURE 2 Atgn Atgn Atgn At-gn Adx Adx Adx Adx Agr Apgn Apx Apx Apgn Apgn- dx Apgn Adx Adx Apx Apx,gb Atpgn Atpgn At-gn Atgn Atgn Atgn Atgn Atgn Atgn Atgn Agr Apgn Apgn Apgn Apgn P gb 2 P gb 2 Apx,gb Apx,gb Agr Agr Agr Atgn Adx Adx Adx Adxhg Adx Adx Adx Adx Adx Atgn Atgn Atgn Adi Apgn Apgn Apgn Apgn Apgn Apgn Apgn Apgn Apgn Apgn Agb Agb Agb P₁t P₁t P₁t P₁t P₁t Agb Agb Agb Atgn Atgn Atgn Atgn At At At Adi Agb P₂gb P₂gb P₂gb Atgn Agr Agr Agr Agr Agb Agr Agr Agr Agr Agr Agr Apgn Apgn Apgn Apgn Apgn Adx Apgn Atgn Atgn Atgn Apx,gb Agb,px Apx Apx,gb Apx,gb₁ Apx,gb Agb Atgn Atgn Atgn Atgn Apgn Apgn Apgn Apgn Apgn Apgn Apgn Apgn Apgn Apgn Adx Adx Adx Adx Adx P₂gb P₂gb Adx Adx Adx Adx Apgn At-pgn At-gn Atgn Adi Adi Adi Atgn Apx Apx Apx Apx At-gn Atgn Atgn At-gn Atgn Atgn At At Asy Asy At At At Agr Agr Agr Agr Agr Adx Adx AAC AAC AAC AAC 0 66 31' W 0 54 00' N 0 55 06' 45" N 0 67 53' 15" W 23J/02 23J/03 23J/04 23J/07 23J/06 23J/05 23J/10 23J/11 23J/12 23J/15 23J/14 23O/03 23O/02 New Quebec Orogen Archean - Proterozoic unconformity SUPERIOR PROVINCE (Ashuanipi Complex) CHURCHILL PROVINCE (Labrador Trough) Schefferville Elross Lake Rosemary Lake Fleming Lake Howell River Stakit Lake Kivivic Lake Howells Lake Lac Desliens Lake Menihek Lac Chaviteau Pointer Lake Howell Lake Chaillon Lac Lac Ribero McPhadyen River Clugny Lac Grenville Makkovik Province Nain Province Churchill Province Superior Province (Ashuanipi Complex) Grenville Province Front Nain Makkovik Happy Valley-Goose Bay Labrador Sea Red Bay Churchill Falls Schefferville Wabush - Labrador City Quebec Labrador Smallwood Smallwood Smallwood Reservoir Reservoir Reservoir Tectonic province boundary Tra ns Lab way rad igh or H Smallwood Reservoir Figure 1 Gabbro dyke. Undifferentiated diatexite Paleoproterozoic Neoproterozoic ? Archean New Quebec Orogen (Labrador Trough) Pyroxenite and melanogabbro Diorite to quartz diorite. Gabbro. Paragneiss Undifferentiated paragneiss and diatexite Tonalite to diorite orthogneiss Unsubdivided rocks of the Labrador Trough, New Quebec Orogen. Leucogranite Undifferentiated Ashuanipi Complex (Québec) Tonalite Syenite Undifferentiated tonalite and paragneiss Brittle to ductile fault structure Geological contact Unconformity Provincial boundary Agb Apgn-dx Apgn Atpgn Atgn AAC Adi P gb 2 At Agr Pt 1 Asy Adx Apx 0 4 8 Kilometers 10 12 Limit of 1:50 000-scale mapping Quebec Labrador Quebec Labrador The ca. 3.0-2.65 Ga Ashuanipi Complex of western Labrador is a granulite-facies migmate terrane consisng of paragneiss, tonalite to diorite orthogneiss, diatexite, mafic and ultramafic intrusive rocks, granite and tonalite plutons and pegmate (Figure 1). Current exploraon surveys being undertaken by Labrador Gold Corporaon are focused on gold and base metal mineralizaon hosted in gneiss and associated iron formaon rocks. Recent 1:50 000-scale bedrock mapping (van Nostrand and Broughm, 2017) and preliminary lithogeochemical results from the region indicate that late-stage granite plutons and pegmate may have the potenal to host gold, uranium, thorium and REE mineralizaon. The granite plutons are 10s of kilometre-scale intrusions (Figures 1, 2) that postdate migmate formaon and are coincident with strong regional aeromagnec signatures (Figure 3). Within some of these intrusions, local elevated gold is hosted in unaltered granite and pyrite-bearing gossan zones that occur proximal to brile to ducle fault zones and indicate that potenal mineralizaon in these rocks may be, in part, structurally controlled. Syn- to late deformaon pegmate veins occur throughout the region and range from metres to 10s metres in thickness. Locally these rocks contain anomalous Th, U and REE contents. Only preliminary exploratory work has been carried out on the granite plutons and pegmate and a systemac examinaon of these potenal host rocks is required to assess their mineral potenal. MINERAL POTENTIAL OF GRANITE PLUTONS AND PEGMATITE IN THE ASHUANIPI COMPLEX, SUPERIOR PROVINCE, WESTERN LABRADOR TIM VAN NOSTRAND
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