The 2740 Ma Côté Gold Au(-Cu) deposit, Canada: Example of porphyry-type magmatic-hydrothermal ore-forming processes in the Archean
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1 The 2740 Ma Côté Gold Au(-Cu) deposit, Canada: Example of porphyry-type magmatic-hydrothermal ore-forming processes in the Archean Daniel J. Kontak, Laura Katz, Laurentian University Benoit Dubé, Geological Survey of Canada (Thanks to: D. Beilhartz, J. Rogers, V. McNicoll, R. Creaser, B. Lafrance, J. Smith)
2 Introduction +8 Moz Au (0.9 g/t Au) deposit centred on a 2740 Ma magmatic-hydrothermal breccia complex!
3 Introduction: Where does Côté Gold fit? X X X X Porphyry, IOCG, syenite Robert et l 2007; Poulsen et al. 2000
4 Summary of Work to Date Kontak, D.J., Creaser, R.A., and Hamilton, M. (2013): Geological and geochemical studies of the Côté Lake Au(-Cu) deposit Area, Chester Township, northern Ontario. In Results from the Shining Tree, Chester Township and Matachewan Gold Projects and the Northern Cobalt Embayment Polymetallic Vein Project. Ontario Geol Survey, Miscellaneous Release Data 294. Rogers, J.R., Beilhartz, D., Kontak, D.J., Katz, L. Dubé, B., and McNicoll, V. (2013): The Côté Gold deposit: discovery of a new generation low-grade, multi-million oz gold resource in the Archean Superior Province, Canada. Program Vol.. NewGenGold 2013, Perth, Australia., Katz, L.R., Kontak, D.J., Dubé, B., and McNicoll, V. (2015): The Archean Côté Gold intrusionrelated Au(-Cu) deposit, Ontario: A large tonnage, low-grade deposit centred on a magmatichydrothermal breccia. In: Targeted Geoscience Initiative 4: Contributions to the Understanding of Precambrian Lode Gold Deposits and Implications for Exploration, (eds) B. Dubé and P. Mercier- Langevin; Geological Survey of Canada, Open File 7852, Katz, L.R. (2016): Geology of the Archean Côté Gold Au(-Cu) Intrusion-Related Deposit, Swayze Greenstone Belt, Ontario, PhD thesis, Laurentian. Smith, J. (2016): Integrated structural and geochemical study of auriferous sheeted quartz veins in the 2740 Ma Côté Gold deposit, Swayze Greenstone Belt, Ontario, MSc thesis, Laurentian. Katz, L.R., Kontak, D.J., Dubé, B., and McNicoll, V. (2016): Geology, Petrology and Geochronology of the Archean Côté Gold Large-Tonnage, Low-Grade Intrusion-Related Au(-Cu) Deposit, Swayze Greenstone Belt, Ontario, Canada. Canadian Journal Earth Sciences.
5 Introduction Dubé and Gosselin (2007) VMS, syenite, orogenic Au deposits (<2710 Ma) Côté Gold 2740 Ma
6 Introduction: Site visit Summer 2010 Breccia (1-3/g/t) Breccia and stock work Tonalite breccia Sheeted fractures/veins
7 Introduction The Discovery! 1 km Historical drill hole 1.3 g/t Au)
8 Section 93+00E facing SE Ore envelope E09-02 E10-30 E10-20 E10-11 E E E g/t open zone of elevated Cu E E10-04 E10-26 E 0-46
9 Introduction The Discovery! What is it?
10 Nature of the Sheeted Veins (?) 1 km 2. Quartz-sericite-pyrite-(carb)
11 Regional Geology Dubé and Gosselin (2007) Côté Gold 2740 Ma
12 Regional Geological Setting Chester Group ( Ma): subaqueous volcanics (felsic to intermediate and mafic) and sediments (clastic and chemical (BIF)) Chester Intrusive Complex (2741 Ma): multiphase, laccolithic shaped, subvolcanic suite of tonalite-diorite-gabbro Facing directions Mafic to felsic
13 Regional Geological Setting (Gemmel 2015 OGS)
14 Yeo Fm Tonalite Tonalite Tonalites East CIC (Berger 20123) Is the tonalite at the Côté Gold deposit different that regional tonalite and if so why???
15 rotated Côté Gold Deposit Geology 2740 Ma Tonalite I (Qtz-Plg (An 30 )) 2740 Ma Diorite (Hbl-Plg (An 50 )) 2740 Ma Magmatichydrothermal biotite breccia
16 Côté Gold Deposit Geology Fracture type B A Breccia type A Gold deposit (+8 Moz 0.9 g/t) B
17 Deposit Geology: Tonalite (I, II) 0.5 mm
18 Côté Gold Deposit: Diorite Hornblende diorite (and evolved phases) Hbl geobarometry = 1.5 kbar
19 Whole Rock Geochemistry
20 Chondrite/Rock Primitive mantle/rock Whole Rock Geochemistry Diorite Tonalite (I, II) Diorite suite
21 Côté Gold Deposit: Breccia Breccia (magmatic/hydrothermal)
22 Côté Gold Deposit: Breccia top Use of logging, petrography and lithogeochemistry (>500 samples) bottom Qtz-Plag-Biot/Chl vs Biot-rich 1 mm
23 Nature of Mineralization (ca. 0.9 g/t Au) Fracture type B A Breccia type (disseminated) A Gold deposit (+8 Moz 0.9 g/t) B
24 Nature of Mineralization (ca. 0.9 g/t Au) 1) Disseminated: - F gr disseminated in matrix of diorite breccia and hydrothermal biotite breccia - Altered tonalite/diorite 2) Fracture and vein controlled Moly VG VG 3) Re-Os m,oly ages (n=4) ca Ma
25 Nature of Mineralization (ca. 0.9 g/t Au) Hydrothermal breccia (Mo-Cu-Ag-Zn-Te-Se-F)
26 Nature of Mineralization Miaroles (?)
27 Alteration Types Biotite Sericite Sodic(Silica) Epidote Early Late Breccia matrix Tonalite Breccia Diorite
28 Alteration Types: Distribution Hydrothermal breccia Magmatic breccia
29 Biotite Alteration (Biot-Mgt-Apt-Carb-Sulf) 1 mm 1 mm 0.5 mm
30 Nature of Alteration: Biotite
31 Nature of Alteration: Biotite (Qtz-Mag-Apt-Carb-Sulf) Biotite altered tonalite (n=20) Fe Fe T Mg K P Li Cs Ba LREE Zn Te F 50 μm 500 μm Apt Epid All Bast Apt 1 mm
32 Nature of Alteration - Biotite veins Oxidation (?) disseminations breccias (Au)
33 Nature of Alteration Sericite (Qtz-Ser-Carb-Py) Sericite altered tonalite (n=19) K Li Rb Cs Ba Au Cu F C S LOI Si Al Fe Fe T Mg Ca Na K Ti P Li Rb Cs Sr Ba La Ce Dy Yb Au Cu Zn Te Bi F S C LOI Sericite altered diorite (n=5) K Li Rb Cs Ba C LOI
34 Nature of Alteration Sodic (Alb-Rt-Tit-Fuch) - Coincident with breccias - Cross cuts units and ore zones - Overprints earlier alteration types
35 Nature of Alteration - Sodic Titanite = 2740 Ma CA TIMS age
36 Nature of Alteration - Sodic Albite altered tonalite (n=9) Mass balance: Tonalite = +Na 2 O, Sr(?) Diorite = +SiO 2, Al 2 O 3, K 2 O, Na 2 O, Rb, Cs, Ba, LREEs Si Al Fe Fe T Mg Ca Na K Ti P Li Rb Cs Sr Ba La Ce Dy Yb Au Cu Zn Te Bi F S C LOI Albite altered diorite (n=9) Si Al Fe Fe T Mg Ca Na K Ti P Li Rb Cs Sr Ba La Ce Dy Yb Au Cu Zn Te Bi F S C LOI
37 Episyenites Nature of Alteration - Sodic
38 Nature of Fluids (Stable Isotopes) S Isotopes (Cpy, Moly, Cpy): δ 34 S = -1.5 to 1.0 (avg. 0 ) δ 34 S H2S = 0 O Isotopes (Qtz veins) δ 18 O = 9.7 to 11.3 (avg ) δ 18 O C = 4-7 O Isotopes (Carb veins): δ 18 O = 7.4 to 8.8 (avg. 8.4 ) δ 18 O C = 3-6 C Isotopes (Carb.) δ 13 C = -0.9 to -4.4 (avg ) δ 13 C C = -5 Suggests mixing of fluid types magmatic and seawater (?)
39 Summary Côté Gold Deposit Formation 1. Amph-biot alt, breccias 2. Regional veins MF MF 3. Sericite (epid) 4. Sodic MF + SW SW + MF
40 Summary Côté Gold Deposit Formation Is this a porphyry-type system, if so what are the implications for metallogeny and exploration? J. Richard 2011 Côté Au Fluids (K-Fe-Au) Diorite-tonalite complex Melts??
41 Two More Important Points (J. Smith MSc 2016)! 1 km 1. Candy Cane 2. South Breccia 1) Origin of the sheeted quartz-sericite-pyrite veins/alteration 2) Evidence for upgrading due to deformation
42 The Sheeted Veins Nebaskwasi Chester 144 London Derry Sheeted veins and alteration haloes pre-date regional deformation
43 The Sheeted Veins Lithogeochemical transect records same fluidisotopic signature as main Côté deposit! 10 cm
44 Over Printng Deformation vs Au Grade
45 Evidence for Au upgrading due to deformation?
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