^ Geology of the Mount Polley Intrusive Complex

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Disclaimer: While every effort has been taken to ensure the accuracy of the information in this map, the !

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! data are provided on an 'as-is' basis, without any warranty, guarantee or representation of any kind,

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! whether expressed or implied. It is the responsibility of the user to check the facts before entering any !

financial or other commitment based upon this information. !

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! Map 1. Geology of Mount Polley Intrusive Complex (pre-mining, except Cariboo-Bell zones)

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! 31 !

! Map 3. Gold Mineralization

! Map 2. Copper Mineralization !

! 591,000 592,000 593,000 594,000 591,000 592,000 593,000 594,000 !

! 591,000 592,000 593,000 594,000

0 0 0 0 ! ! !

0 0.6% Copper 0 0 0 ! 0.6 g/t Gold

! 21

0 0 0 0 ! !

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! 6 6 6 6 ! !

! D 2 2 2 2

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! D 8 8 8 8

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! D 5 5 5 5

! D D

! D D D

! 0.3% Copper 0.3 g/t Gold !

! D D Pit outline

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! Quesnel terrane

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! D D

! f

! D 65

! D

! 0.1% Copper 0.1 g/t Gold

! 1 0 0

! EJbc D 10

! Stikine terrane Planned pit0

! 0 0

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! LT ! ! rp

6 km D 6 Limit of elevated Cu, Limit of elevated Cu,

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! 8 8

! , , Au mineralization Au mineralization

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5 D 5

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! D EJt D 

! D D 85 !

ff 86 !

! LTrJNbc

! 0 Pit outline Pit outline

! Prince 00 73 ! ! 1

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! f

! George 0 0 0 0 !

!  0 0 0 0

! 85

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LTrpkm 0 0 0 0 !

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! Planned pit ! 5 5 5 5 ! Planned pit

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! 2 2 2 2

! f

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! 8 8 8 8 ! ! !

! ^ , , , , ! Map Area 53 D 5 5 5 5

! LTrJNbc !

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! D D D ! D D D

! D D LTrpbx2 P o l l e y L a k e P o l l e y L a k e !

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! D D

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! D D ! 76

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10 D D . D ! 1 ! D

Vancouver ! ! 70 U D m

D D x2 ! b x2 ! 110 p b ²

0 D r rp \ ! D LT T VICTORIA D L XY

! D

! D D D .

D D 15 Br

205.2 +/- 1.2 Ma, Ar/Ar (bi) ! 0 0 0 0 ! o ! w

n 0 0 0 0 0 0 0 0 ! W 74 , , , , ! a

D l 4 4 4 4

D f 76 l ! D Fa 2 2 2 2 D u 8 8 8 8

! Gree lt , , , , ! D n LTrpbx2m D D D D U Gian 83 5 5 5 5 D D D t Fault 90 79 D

f ! ! D D . f f f 58 D D D D

D D 80 ! D D 81

Note: Areas of outcrops are shown with a darker shade ! XY D 83 f ! f 80 74 f

! f ! D D 165.2 +/- 1.8 Ma, Ar/Ar (hb) LT f LTrpkm

D rp 85 79 1 ! b 0

! D x2 f 68

EARLY JURASSIC f 74 0 ! f f 84 76 0

D D ! D 88 ! D f f

LTrpmdu D 48 D D 81 f 80

! f

Trachyandesite tuff. Plagioclase-hornblende-biotite and minor (1%) quartz grains in aphanitic ! D EJt ! 85

mauve-grey matrix. 196.7 ±1.3 Ma, U-Pb zircon (Logan et al. 2007b). ! D 

! D D f f !

! 83 0

! 76 0 ! ! ! D f

LTrpbx3a 1 D 69 L DD f T 1 D D r D p D D k 0 D m 0 0 0 0 0 0 0

D D 0 0 0 0 LATE TRIASSIC - EARLY JURASSIC D LT 0 0 D rp 0 0 0 0 , , , , , D D k , D  m 3 3 3 3 5 D 5

D D 2 2 2 2

2 D 2 8 8 8 8

NICOLA GROUP (IN PART) , , , , 8 8 5 5 5 5 , , 5 5

D LTrpbx3 D D D

LTrJNbc Breccia, conglomerate. Massive, coarse, matrix-supported polymictic breccia and minor cobble D D f  m D f

D k f 84 p

conglomerate, with clasts of intermediate intrusives, volcanics and microporphyries, in grey to D D r f 71 f D D T LTrpap 0 L 74 64 84 maroon crystal-lithic matrix. Minor lithic sandstone-siltstone, and rare trachyte-latite. Strong 0 D D D 78 81 87 0 f 1 D D D D LTrpkm f f P o l l e y L a k e hematite cement immediately north of and overlying MPIC. Labelled EJbc where known Jurassic. D D D DD D D  D D DD 81 f 74 D D D D 88 D L f f T D f 85 68 L D D r f D D p 85 f 80 T D k r f p D D m f 75 k LATE TRIASSIC D D D 65 m D D 86 Df f 73 f  62 D D D LTrpkm f f D LTrpkm f MOUNT POLLEY INTRUSIVE COMPLEX (MPIC) D D D f 78 86

D D 0 0 D LTrpbx2 D 0 0 0 0 D f 64 0 0 0 0 0 0 , ,

D D D D D 71 , , 2 2

LTrpap Augite porphyry dike. Green-grey, fine grained basaltic-andesitic dikes with subequant D 2 2 2 2 2 2 f 8 8 LTrpbx1 8 8 , , clinopyroxene phenocrysts, and lesser aphyric mafic-intermediate dikes. D D , , 5 5 D 5 5 D B o o t j a c k L a k e B o o t j a c k L a k e 86 D D D LTrpbx1. Intrusive complex with a significant amount of hydrothermal fragmental breccia D D LTrpbx1 D D D (polymictic/oligomictic) or inclusion-rich intrusion, comprising (sub)rounded to subangular diorite to D monzonite porphyry clasts in a cognate igneous ‘cement’ (igneous breccia), and/or a clastic matrix of D D LTrpbx1m fine to coarse rock flour. Clasts in igneous breccia may be partly resorbed. Contacts are gradational into D

p variably brecciated (monomictic jigsaw-fit type) diorite to monzonite. Characteristic of bx1 (though not a D D D D p LTrpd1 r D D T ubiquitous) is texture-destructive alteration due to moderate to strong secondary K-feldspar ± biotite ± L LTrppp D D albite ± magnetite ± actinolite/diopside ± garnet, replacing the igneous groundmass or breccia matrix, D D 0 200 400 m 0 200 400 m D LTrpmdu or permeating fractures. LTrpbx1m = mineralized to ore or near-ore grade with chalcopyrite ± bornite D D D LTrpap or pyrite. D D D 591,000 592,000 593,000 594,000 591,000 592,000 593,000 594,000 D D D D D Grade contours D D

D The Cu and Au grade contours were generated from the 3-D computerized block models used at the Mount Polley Mine for reserve estimation. The grade values in each block in the model are geostatistically estimated using ‘Ordinary Kriging’ from exploration D f D D D drill assay results. The block models include already mined ore as well as remaining resources (to December, 2012). The three main contours shown are the smoothed outlines of grade blocks averaging 0.1, 0.3 and 0.6 percent copper on Map 2, and 0.1, 0.3 0 72 f 0 0 DD 0 56 and 0.6 grams per ton gold on Map 3. These contours display the grade distribution at an elevation most representative of the ore zones. In the core of Mount Polley centred on the Springer zone the contours are at an elevation of 1,000 metres (a.s.l.); in the 0 D  0

, D D D 1 , D D 0 4 0 4 Northeast zone (Wight pit) the contours are at an elevation of 900 metres (a.s.l.). This is roughly equivalent to 100-200 metres below the pre-mining topography. Patterns of grade distribution at deeper levels may be different in detail but are generally D 0 2 LTrpd1 2

8 8 conformable. The ‘Limit of elevated Cu, Au mineralization’ contour is less rigorously defined, based on assay results from exploration drilling, trenching and mapping. , D D , 5 D 5 LTrpmdu ² D LTrpkm D D (Kriging is a geostatistical estimation method that infers the value of a random field at an unobserved location from observed samples at known locations.) D u

d 73

D 86 D

D m 76 f f

D p D D r LTrpbx1 f 76 f f T D f

D L 86 D

86 D 69 D D f LTrpkm f D D

D f

205.2 +/- 1.2 Ma, U-Pb (z) 57 f D D D lt D 81 79 D u D D a D D D D F XY D 70 D LT f D D r rp D D D e 00 82 a g D 2 p rin 1 D LTrpbx2 p f D L S D 0 D D TrNb D 86 20 abx Map 4. Alteration Map Map 5. Mount Polley Pits and Zones h 1 LTrpkm D rt D D D LTrpkm D 1 cm 1 cm 1 cm 1 cm 5 cm o D N LT f 1 LTrpd2 L D 591,000 592,000 593,000 594,000 591,000 592,000 593,000 594,000 rpp D 2 Trp D D

p 0 db D Quarry 0 0 f D 0 0 0 0 0 P L D Pit outline 0 Planned pit 0 0 0 T D 0 0 r , ,

D , , o pd

6 6 Zone

D 6 6 l 1 78 l D L 2 2 D D 2 2 57 e Tr 8 8 y D p 8 8

D , , LTrpbx2 LTrpbx2. As bx1, but occurs outside central MPIC and is characterized by less texture-destructive f x1 L km , , D T 5 5

LTrpbx1m b 5 5 p u r r d p alteration than bx1. Igneous cement is less common than rock flour matrix and/or mineral cement. LT b Planned pit Underground portal Active pit m F x2  p a D LTrpbx1 r bx2m = mineralized to ore or near-o re grade. T u  D L l D t LTrpbx1m  LTrpbx2m LTrpap D Completed pit D LTrpmz LTrpap D D D Boundary LTrpd1 XY D D LTrpkm Reserve/Exploration zone D Wight f D f Zone

66 204.7 +/- 3 Ma, U-Pb (z)

L 66 Pit D T L r T p r ! Property boundary D d p d LTrppp 220.8 +/- 1.3 Ma, Ar/Ar (bi) 1 1 87 D D f  63 D 0 0 LTrpbx1m XY D 0 0 0 0 D 0 0 0 0

XY 0 0 , , D , ,

D 5 5 5 5 2 2 D D 207.8 +/- 1 Ma, Re/Os (mo) D  2 2 8 8 8 8 , , ³ D , , 5 5

D 5 5 LTrpmz P o l l e y LTrpd2 LTrpmdu P o l l e y L a k e L a k e 0 D 0 0 D 0 0 0 , D D , Junction

3 D 3

2 D 2

8 D 8 Zone , 75 ,

5 D . 5 D

D L T D r f D p D LTrpbx2m D LTrpbx1 D E b D

1 cm LTrpbx2 D a x2 72 LTrpmdu

LTrpd1 s t 46 ! 82 D L D C Tr 71 a pk North

m 0 0 D 0 0 f f D r 0 0 ib LTrpmdu 0 0 0 0 0 0 , , LTrpbx1m o , Springer ,

L 4 4 D o T D 4 4

2 2

D rp 2 Polley 2 8 8

k 8 8 75 f , , F m , Zone , 5 5 D 5 5 LTrpbx2 a D # Mountain D u 79 lt Bell Pit f 1 LTrNbabx 1 0 f64 0 D D c 72 83 LTrNbabx ont f D D ac D t D in LTrpd2 fe D Springer

r r D L e D f Trp D d f 66 km

D D D Pit

f r LTrpd2 D D LTrpap f o U 88 m D Cariboo a D D 88 75 LTrpbx2 e D LTrpkm

f 0 0 r  0 0 o D Pit

D 0 0 m 0 0 0 0 D 0 0 , , L , , a D T 1 3 3 rp 3 3 0 f

g D 2 2 0 km 2 2

n 8 8 0 8 8 D , , e D , , 5 5 57 L 5 5 ti D T Test leach pad c D rp s D km Crusher ig D D D

n D D

at D f D WX Zone u D f D 5 cm 1 cm 1 cm re D D 87 D D D D D LTrpkm C2 81 D D LTrpbx2m

D D XY Zone

D LTrpbx3 LTrpbx3. Fragmental breccia (polymictic) comprising mm- to cm-scale, rounded to angular, f 206.2 +/- 1 Ma, Re/Os (mo) 83 Mill monzonitic porphyry clasts in a related rock flour matrix. Mostly matrix supported. Distinguished D D Southeast

0 D 87 f 0 from LTrpbx1 and LTrpbx2 by a lack of (1) coherent rocks, (2) igneous breccia cement, (3) potassic 0 LTrppx D D D 0 Pit 0 0 LTrpbx3a alteration (except in transported clasts), and (4) mineralization (except pyrite). Local garnet , D , 2 D 2 D D 0 0 2 L 2 D TrN D 0 0 0 0 alteration. Subtype bx3a has a finer rock flour matrix, and a high matrix to clast ratio. D 0 0 8 D ba D 8

, D ,

b 0 0 x 0 0 , , D , ,

5 D 5 2 2 D 2 2 2 2 D D D 2 2 8 8 D 8 8

D , , , , 5 5 bx3a D 5 B o o t j a c k 5 B o o t j a c k L a k e D D D L a k e Pond Pit D D

B o o t j a c k L a k e D D D D D 70 D f D D D f D D 74 LTrNbabx

LTrpd1 D

. D D 75 P r 0 200 400 m o p y l 0 200 400 m D i t i c 0 0 0 0

D 0 0 D , , LTrNbabx 591,000 592,000 593,000 594,000 1 591,000 592,000 593,000 594,000 1 2 2 8 8 , , 5 5 D D LTrNbabx Alteration D Highly generalized map of hydrothermal alteration assemblages at Mount Polley. The smoothed alteration outlines should D D L T not be taken to indicate that the alteration pattern necessarily postdates intrusion or breccia contacts, or faulting.

D 67 rN D L b

T a rN b 1 cm 1 cm 1 cm x ! b f D a D b D D

D D x ! 29 D D D D 1 f 0 40 L 0 72 D T D D 0 rN b D D D

D a b

LTrpkm Potassium feldspar-(plagioclase-)phyric monzonite. Pale to deep pink, fine to coarse grained x groundmass, with sub-cm to megacrystic (2-3 cm) phenocrysts, with trachytoid alignment in some ! D 73 Fault: approximate, inferred ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! 34 f dikes and larger intrusions.  D ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! D D Contact: defined, approximate, inferred LTrppp Plagioclase feldspar porphyry (monzodiorite). Grey to red-pink where strongly altered, typically crowded with phenocrysts up to 5 mm, locally aligned, in fine-grained groundmass. Alteration 0 0 0 0

0 LTrpd2 0 , , POTASSIC-SODIC, CALC-POTASSIC

LTrpmz Monzonite to monzodiorite. Pale pink, medium-grained, even-textured, More homogeneous than 1 1 2 2 8 8

units LTrpd2, LTrpmdu, and lacking in inclusions. , , I K-feldspar* − biotite − albite − magnetite − diopside/actinolite ± calcite ± andradite garnet ± 5 5 sulfides. Retrograde chlorite ± sericite ± albite ± epidote, ± calcite ± zeolite ± prehnite ± clay. 591,000 592,000 593,000 594,000 LTrpmdu Monzodiorite and monzonite, some diorite, undivided. General, heterogeneous unit of intermediate intrusions with poorly defined internal contacts. Pink to grey, fine to medium grained, equigranular to II K-feldspar − biotite − magnetite – albite ± calcite ± sulfides. Minor diopside/actinolite ± epidote ± andradite garnet. Retrograde chlorite ± sericite ± albite ± gypsum. Dashed hatch pattern where ill- plagioclase-phyric; mafic lithic and other inclusions common, verging on igneous breccia locally. 83 Includes small dikes and zones of bx1 or bx2 hydrothermal breccia not differentiated on map. f defined. Geoscience BC Map 2014-08-1 Geology Geology is based on Imperial Metals’ mapping by C. Rees, supplemented by L. Ferreira and L. Bjornson, and fault and geophysical interpretation by C. Taylor. Data is primarily from outcrops or trenching on the pre-mining surface, except for the Cariboo and Bell zones where geology is simplified from detailed bench mapping and III K-feldspar − magnetite − biotite − chlorite − calcite − andradite garnet ± albite ± epidote ± Leucodiorite porphyry, banded. Minor unit. Pale green and pale grey, fine to medium grained, LTrpdb computer projections, both by G. Gillstrom. Some geological contacts may be faults in part, in particular in the Cariboo-Bell zones. Other map sources include Logan et al. (2007a: unit EJt) and Read (1997). apatite ± clinozoisite ± anhydrite ± sulfides. Minor diopside/actinolite. Retrograde chlorite ± characterized by wispy laminations (possible flow banding) and fluidal (?) clasts; gradational with carbonate ± sericite ± gypsum ± rare quartz. unit Pmdu. Geology of the MARGINAL POTASSIC - PROPYLITIC LTrpd2 Diorite to monzodiorite, leucodiorite, and minor monzonite. Characterized by uneven textures and References Data sources numerous small inclusions. Grey to green-grey, cream-grey (pink where more altered), medium IV Albite − epidote – pyrite ± magnetite ± K-feldspar ± calcite ± sulfides. ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Mount Polley Intrusive Complex Contact: defined, approximate, inferred Jackson, M.L. (2008): Evolution of the Northeast zone breccia body, Mount Polley mine, British Geological terrane data grained, usually inequigranular to subporphyritic (plagioclase and local augite phenocrysts). Columbia; unpublished M.Sc. thesis, University of British Columbia, 232 p. Massey, N.W.D, MacIntyre, D.G., Desjardins, P.J. and Cooney, R.T. (2005): Digital

Fault: approximate, inferred ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Logan, J.M. and Mihalynuk, M.G. (2005): Regional geology and setting of the Cariboo, Bell, Springer Geology Map of British Columbia: Whole Province; B.C. Ministry of Energy and Mines, LTrpd1 Even-textured augite(-biotite) diorite to monzodiorite. Speckled medium-grey, medium to coarse and Northeast porphyry Cu-Au zones at Mount Polley, south-central British Columbia; in Geological Geofile 2005-1, SKARN (s.l.) Part of NTS Sheet 93A/12 grained, mostly equigranular. Fieldwork 2004, B.C. Ministry of Energy and Mines, Paper 2005-1, 249-270 pp. URL < ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! D http://www.empr.gov.bc.ca/Mining/Geoscience/PublicationsCatalogue/ D = downthrown side V Andradite garnet – epidote ± albite ± calcite ± magnetite ± sulfides. U Logan, J.M., Bath, A., Mihalynuk, M.G., Rees, C.J., Ullrich, T. D. and Friedman, R.M. (2007a): GeoFiles/Pages/2005-1.aspx> [November 2007] Chris Rees, Greg Gillstrom, Lee Ferreira, Leif Bjornson and Chris Taylor 74 Regional geology of the Mount Polley area, central British Columbia; BC Ministry of Energy, Mines and

!. 15 LTrppx Pyroxenite, minor melagabbro. Dark green to black, medium to coarse grained. dip of fault plane, and slickenline orientation, sense of shear ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ³ Petroleum Resources, Geoscience Map 2007-1, 1:50,000 scale. Elevation model data Canadian Council on Geomatics (2004): Canadian digital elevation data; Natural Logan, J.M., Mihalynuk, M.G., Ullrich, T. and Friedman, R.M. (2007b): U-Pb ages of intrusive rocks * Note: Weak to intense, fracture-controlled to pervasive ‘reddening’ due to nanoscale hematite inclusions in D Resources Canada, GeoBase®, Individual mapped outcrop location, area of mapped outcrop ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! and 40Ar/39Ar plateau ages of copper-gold-silver mineralization associated with alkaline intrusive centres secondary K-feldspar is common in I, II, III; sporadic in IV. 1 : 10,000 URL [October 2004] at Mount Polley and the Iron Mask Batholith, Southern and Central British Columbia; in BC Ministry of NICOLA GROUP (NORIAN) f Structure: bedding, fracture ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Energy, Mines and Petroleum Resources, Geological Fieldwork 2006, 93-116 pp. Topographic data 0 250 500 1,000 m Mortensen, J.K., Ghosh, D.K. and Ferri, F. (1995): U-Pb geochronology of intrusive rocks associated BC TRIM (2006): British Columbia Terrain Resource Information Mapping (TRIM) Digitial LTrNbabx Basalt to andesite, or intrusive-equivalent meladiorite, microdiorite. Undivided volcanic and   with copper-gold porphyry deposits in the Canadian Cordillera; in Porphyry Deposits of the Northwestern Map Products; B.C. Ministry of Forests, Lands and Natural Resource Operations, Crown Glacial striae: direction known, direction unknown ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! subvolcanic coherent rocks and fragmental breccias. Grey, dark mauve, dark green, finely Cordillera of North America (Schroeter, T.G., ed.), CIM Special Volume No. 46, 142-158 pp. Registry and Geographic Base Branch. URL Universal Transverse Mercator Projection, Zone 10 plagioclase- or pyroxene-phyric, local analcite or pseudoleucite. Breccias are undifferentiated Pass, H. E. (2010): Breccia-hosted chemical and mineralogical zonation patterns of the Northeast Zone, Horizontal Datum: North American Datum 1983 ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! XY [March 2006] igneous-hydrothermal and volcaniclastics, characterized by a lack of felsic porphyry fragments. Geochronology sample (labelled by age, analysis method) Mt. Polley Cu-Ag-Au alkalic porphyry deposit, British Columbia, Canada; unpublished Ph.D. thesis, Local lenses of mafic or calcareous sediments, limestone. Gradational contacts with MPIC, where University of Tasmania (CODES), 276 p. True north is 1.08° west of grid north some breccias may be hydrothermal and coeval with MPIC intrusions. Elevation contour (20m interval): major, minor ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Read, P. B. (1997): Surface geology of the area east of the Cariboo Pit, Mount Polley Mine; unpublished Acknowledgments report for Mount Polley Mining Corporation-Imperial Metals Corporation, Geotex Consultants Limited, Cartography by Fion Ma and Fionnuala Devine from Geoscience BC, and Chris Rees from April 2014 December 1997. Imperial Metals Corporation. Rees, C. (2013): The Mount Polley Cu-Au porphyry deposit, south-central British Columbia, Canada; in Logan, J.M. and Schroeter, T.G., eds. Porphyry systems of central and southern BC: Prince George to Elevation model prepared by Kaz Shimamura, Geological Survey of Canada Suggested Reference: Princeton, Society of Economic Geologists Field Trip Guidebook 44, 67-98 pp. Rees, C., Gillstrom, G., Ferreira, L., Bjornson, L. and Taylor, C. (2014): Geology Ross, K.V. (2004): Alteration studies of the Northeast, Springer and Bell zones, Mount Polley Mine; of the Mount Polley Intrusive Complex; Geoscience BC Map 2014-08-1, internal reports prepared for Imperial Metals Corporation. 1:10,000 scale.