Geology of the Quest BC area: regional setting and ore deposit models

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1 Exploration Undercover: Making Effective Use of Public Geoscience Data Geology of the Quest BC area: regional setting and ore deposit models Thomas Bissig, Mineral Deposit Research Unit, University of British Columbia Acknowledgements: Dianne Mitchinson, Santiago Vaca, Geoscience BC, and MDRU, Jim Logan, Paul Schiarrizza (BCGS).

2 Porphyry deposits in BC and Yukon Mod.from Sinclair, 2008 Various types of porphyry mineralization Alkalic and Calc-alkalic affiliations, but alkalic Cu-Au association most important Highland Valley porphyry Cu deposit is the largest Open pit mine currently operating in N. America 2 Principal episodes: U. Triassic to Mid Jurassic and Late Cretaceous to Eocene

3 Upper Triassic-Upper Jurassic Porphyries Most prolific metallogenetic epoch Pre to syn accretion Early Calc alkalic Cu-Mo (Au) porphyries ~ Ma Alkalic Cu-Au porphyries ~ 200 Ma Calc alkalic Cu- Mo and Cu Au porphyries S Ma Alkalic Cu-Au porphyries Q < 170 Calc alkalic Cu-Mo- Au porphyries (Island Cu) Mod after Nelson and Colpron, 2007

4 Cretaceous to Eocene porphyries All calc-alkaline, some Mo +/- W rich In British Columbia concentrated along the Skeena Arch = major crustal break Epithermal Au-Ag prospects present.

5 Tectonic setting at time of porphyry emplacement Triassic Collapse of the back-arc Slide Mountains Ocean, and initial interaction of marine arc with continental margin Formation of calc-alkalic and alkalic PCD along length of arc at end of magmatic episode Graphics from Monger (2008); Nelson and Colpron (2007)

6 Middle Jurassic 2nd stage of alkalic porphyry Final amalgamation Arc shifts to west Sinistral strike slip & opening of N. Atl. Graphics from Monger (2008); Nelson and Colpron (2007)

7 Triassic Formation of calc-alkalic and alkalic, silica undersaturated, PCD along length of arc at end of magmatic episode Early Jurassic Formation of alkalic PCD in localized area Oceanic plateau? Graphics from Monger (2008); Nelson and Colpron (2007)

8 Lorraine Quest compilation map Mt Milligan Alkalic Cu-Au porphyries Mt Polley, Milligan, Lorraine Endako Quest P. George Calc Alkalic Mo and Cu-Mo Endako, Gibraltar Extensive cover! Nechaco basin Gibraltar Mt Polley Geoscience BC Map

9 Capoose Endako Blackwater Nechako basin: host to Late Cretaceous to Eocene porphyries and epithermal deposits and prospects Classification according to Minfile Epithermal Porphyry Mo-Cu Carbonate hosted Au-Ag Newton Other probable epithermal Map courtesy of E. Bordet, MDRU

10 Na 2 O + K 2 O (wt%) Igneous associations Porphyry Cu-Au-Mo deposit classification Arizona calcalkalic Magnetitepy-cpy vein, Copper Mtn High-K calcalkalic Silicaundersaturated alkalic Cu-Au Cu-Au SW Pacific calc-alkalic Cu-Au(-Mo) SiO 2 (wt%) Silica-saturated alkalic Cu-Mo Modified from Lang et al., 1995

11 Porphyry Mineralizing processes

12 General alteration model (calc alkalic type) Qz-mt +/- K-sfp, barren Ep-chl (propylitic) Qz-ser +/- clay overprint (phyllic +/- argillic) Bi-ksp +/- mt (potassic) Not shown: Advanced argillic/silicic lithocap BAJO DE LA ALUMBRERA (1975, pre-mining) Se also Ulrich and Heinrich, 2002)

13 Classic mineralization styles (calc alkalic type) Multiple vein generations, Quartz gangue Breccias Stockwork Chuquicamata pit in March 2009

14 Alkalic vs Calc-alkalic porphyries Alkalic districts typically have Myarolitic cavity filled with Bn-cpy, N-parkes Several small deposits N-Parkes Potassic, calcic, sodic alteration, abundant mt, hematite dusting is typical. Phyllic and argillic alteration scarce and qz veins only in deposits related to silica saturated rocks. Generally low py Ab-ep-chl +/-carb alteration, Mt Milligan Mt Polley NE zone Complicated and apparently small alteration footprint. Breccias important in some deposits particularly in silica undersaturated types. May host high grade

15 Features reminding of IOCG s, Skarns Pegmatite style K-fsp, coarse bi veins with late cpy, Copper Mountain, BC Magnetite-Apatite veins, Afton, BC Garnet-diopside-biotite cemented breccia Galore Cr. Megacrystic Or-plag phyric monzonite. Galore Cr. Garnet

16 Alkalic porphyry Cu-Au deposits: Generalized alteration model Alkalic lithocap (albite - K-feldspar - sericite- quartz - carbonate tourmaline) - chargeability high, magnetic low Skarn (mt skarn may form in limestone or reactive volcanic / volcaniclastic rocks, magnetic high) Reddened propylitic halo (hematite dusting of feldspars, negative S isotopes in sulfides, increasing magnetic susceptibility towards ore, Zn and Pb geochemical anomaly) Legend - Alteration Distal Propylitic (chlorite sub-zone: chl-carb hm epi ) Skarn (py-hm-mt-chl-carb-gt) Jensen and Barton, 2000 Calc-potassic or potassic core (magnetic high, Cu-Au-Mo geochemical anomaly) Skarn propylitic (epi-py) Alkalic lithocap (ab-kf-sercarb--py-tm) Sodic (ab-qz-hm) Outer Propylitic (albite-actinolite subzone: ab-act-qz-carb-py) Inner Propylitic (actinolite-hematiteepidote subzone: ab-chl-act-epi -hm -qz) Outer calc-potassic (Kf-chl-bt-ab-act-qtz-cp) Inner calc-potassic (bt-act-mt-kf-ab-qtz-bn) Based on Wilson et al. 2007

17 Mount Polley NE zone Wight pit, NE zone Silica undersaturated to saturated. Age: Ma: Pre-accretionary Proven and probable reserves estimated [Jan 1/09]: 46.2 million t grading 0.34% Cu, 0.29 g/t Au and 0.95 g/t Ag, The current mine life is to the end of

18 Mount Polley NE Zone M. Jackson, MSc, H. Pass, PhD Legend Polymictic breccia and conglomerate Monzonitemonzodiorite Non- or weakly mineralized matrix-rich breccia Mineralized cementand matrix-rich breccia K-feldspar-phyric monzonite Pit boundary Faults Long-section / x-sections DDH location and trace

19 Alteration & Cement Distribution Legend 50m Pass, 2010

20 Mt Milligan 590 Mt at % Cu and 0.35 g/t Au Silica saturated Alkalic porphyry, Age: Ma: syn to post accretionary Panoramic view over pre-mining deposit

21 Mount Milligan P. Jago, MSc DWBX zone = Cu-rich, Au-moderate WBX zone = Cu-rich, Au-poor MBX zone = Cu- and Au- rich 66 zone = Cu-poor, Au-rich Plan provided by Placer Dome Inc.

22 Mount Milligan

23 Alteration geometry with ore grade

24 PGE at Mt Milligan in subepithermal veins Late stage veins (Vb: qz-py-carb; VI py-chlorite), throughout the deposit Fluids: Low density and salinity, no evidence for boiling, depth > 1.5 km Nadretteite-Stibiopalladinite (Pd 2 Sb-Pb 2 Sb) Sperrylite (PtAs 2 ) and others present. Le Fort et al. 2011

25 Variation in trace elements in epidote and pyrite as S isotopic compositions Jago et al., in press

26 Nicola/Takla Gp. Quesnel Terrane BCGS Geoscience map QUEST bedrock Logan et al M P

27 Regional MAG, NRCAN. Where volcanics are mapped both Mag high s and Lows are present Different structural orientations: NW and N. S. Vaca, WIP

28 Volcanic setting Nicola Group, Takla Group, Stuhini Group: Upper Triassic, basalts and basalt derived volcano sedimentary rocks. Volcanic host rocks are subaqueous, locally possibly subaerial (Mt Polley, Lac La Hache) Alkalic compositions (analcime, possibly after primary Leucite) of volcanic rocks may be restricted to vicinity of coeval ore deposits (?) oherent basalts have high magnetic usceptibility around coeval porphyry u-au mineralization at Mt Polley.

29 Mt Polley, Lac La Hache -3 Magnetic Susceptibility as Proxy for Oxidation State Highly oxidized parts of the arc are more likely to host a Mt. Polley Oxidized rocks tend to be more alkalic Titanaugite with magnetite inclusions Fe 2+ O/Fe 3+ Magnetic susceptibility *10 SI units200 group 2 group 1 Ongoing MDRU research; Bissig et al. 2010, Vaca et al. 2011, 2012 Increasing oxidation state Mt. Milligan and NE of Bridge Lake Augite without magnetite inclusions

30 Quest Aeromagnetic Signatures Mount Polley: Relatively high magnetic intensity in Nicola Gr. volcanics MP BC geomap (see Ongoing MDRU research; Bissig et al. 2010, Vaca et al. 2011

31 Quest Aeromagnetic Signatures Mount Milligan: Generally subdued magnetic intensity in volcanics. Mag high corresponds to mid Jurassic (169 Ma) intrusion Logan et al (see Ongoing MDRU research; Bissig et al. 2010, Vaca et al. 2011

32 Endako Mo porphyry: different mag signature compared to alkalic Cu-Au Casey Granite Endako Quartz Monzonite Leastaltered Kaol overprnt Potassic alteration Kaol overprnt Phyllic (Quartzsericite-pyrite) Argillic (Kaolinite) Least-alt d Casey Granite Courtesy of D. Mitchinson

33 Exploring the gap

34 Bedrock geology Interpretation of bedrock geology on the basis of next to no outcrop Logan et al Geoscience BC report

35 Bedrock geology The different approach: Interpreting bedrock geology on the basis of stream and lake sediment geochemistry using statistics and neural network technology Barnett and Williams, Geoscience BC report

36 K-feldspar pyrite vein cutting monzonite K-feldspar megacrystic alkalic porphyry

37 Conclusions High grade ore, Mt Polley NE zone Late Triassic in Quesnel Arc and Late Cretaceous to Eocene Dominantly porphyry Cu-Au and Cu-Mo, lesser epithermal affinity. Alkalic porphyries have narrow footprint, are magnetiterich and relatively pyrite poor Important differences between alkalic vs. calc-alkalic porphyries which influence exploration Untapped exploration potential under cover

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