BL

FORT

OWL

125°30'W

125°30'W

126°0'W

126°0'W

54°45'N 54°45'N

54°30'N 54°30'N

0 5 102.5Kilometres

61 - 84 (105)

85 - 92 (32)

93 - 126 (36)

127 - 152 (9)

153 - 170 (6)

171 - 452 (4)

Cr (ppm)<63 µm

INAA

Babine

LakeSpecularite

Lake

ButterfieldLake

PendletonBay

FlemingCreek

BL

FORT

OWL

125°30'W

125°30'W

126°0'W

126°0'W

54°45'N 54°45'N

54°30'N 54°30'N

0 5 102.5Kilometres

10 - 29 (98)

30 - 35 (38)

36 - 43 (38)

44 - 47 (8)

48 - 56 (6)

57 - 101 (4)

Ni (ppm)<63 µm

Aqua Regia, ICP-ES

Babine

Lake

SpeculariteLake

ButterfieldLake

PendletonBay

FlemingCreek

BL

FORT

OWL

125°30'W

125°30'W

126°0'W

126°0'W

54°45'N 54°45'N

54°30'N 54°30'N

0 5 102.5Kilometres

3.8 - 15.2 (96)

15.3 - 16.9 (41)

17.0 - 18.7 (37)

18.8 - 20.2 (8)

20.3 - 20.9 (6)

21.0 - 32.0 (4)

As (ppm)<63 µm

INAA

Babine

Lake

SpeculariteLake

ButterfieldLake

PendletonBay

FlemingCreek

BL

FORT

OWL

125°30'W

125°30'W

126°0'W

126°0'W

54°45'N 54°45'N

54°30'N 54°30'N

0 5 102.5Kilometres

-2.0 - 5.0 (143)

5.1 - 9.0 (33)

9.1 - 11.0 (7)

11.1 - 18.2 (5)

18.3 - 31.0 (4)

Au (ppb)<63 µm

INAA

Babine

Lake

SpeculariteLake

ButterfieldLake

PendletonBay

FlemingCreek

BL

FORT

OWL

125°30'W

125°30'W

126°0'W

126°0'W

54°45'N 54°45'N

54°30'N 54°30'N

0 5 102.5Kilometres

-1.0 - 1.0 (179)

1.1 - 2.0 (5)

2.1 - 5.9 (4)

6.0 - 29.0 (4)

Mo (ppm)<63 µm

Aqua Regia, ICP-ES

Babine

Lake

SpeculariteLake

ButterfieldLake

PendletonBay

FlemingCreek

BL

FORT

OWL

125°30'W

125°30'W

126°0'W

126°0'W

54°45'N 54°45'N

54°30'N 54°30'N

0 5 102.5Kilometres

9.00 - 41.0 (103)

41.1 - 46.0 (36)

46.1 - 59.7 (33)

59.8 - 70.9 (10)

71.0 - 117 (6)

118 - 522 (4)

Cu (ppm)<63 µm

Aqua Regia, ICP-ES

Babine

Lake

SpeculariteLake

ButterfieldLake

PendletonBay

FlemingCreek

125°30'W

125°30'W

126°0'W

126°0'W

54°45'N 54°45'N

54°30'N 54°30'N

0 5 102.5Kilometres

BL

FORTOWL

EEva

EO

lmJHSH

EEva

PJCSPTrCRgs

uTrTv

PTrCSvb

PTrCTum

PnTrCTus

uTrTvb

EMJSPd

DTrT

DTrT

EEva

LTrBgb

EEva

DPAgs

uTrTva

uTrJSs

LTrBum

lmJHvf

PTrCRgs

DTrTma

EEvl

MJSLM

MJSPsy

EGo

LTrJTpT

LTrgd

LTrgd

LTrJTpT

EGo

uTrTvlDPAls

DPAsf

EEvf

uTrTv

EEva

EMJSPd

EEvl

EEva

Babine

LakeSpecularite

Lake

ButterfieldLake

PendletonBay

FlemingCreek

Geology (Cui et al., 2015)

Paleogene

EE

Nechako Plateau Group -Endako Formationva: andesitic volcanic rocksvl: coarse volcaniclastic andpyroclastic volcanic rocksvf: rhyolite, felsic volcanic rocks

EO

Nechako Plateau Group - OotsaLake Formationrhyolite, felsic volcanic rocksva: andesitic volcanic rocks

EGo

Goosly plutonic suitegranodioritic intrusive rocks;granite, alkali feldspar graniteintrusive rocks

Jurassic

lmJHvfHazelton Groupcoarse volcaniclastic andpyroclastic volcanic rocks

lmJHSHHazelton Group - Saddle HillFormationundivided volcanic rocks

MJSPsySpike Peak intrusive suitesyenitic to monzonitic intrusiverocks

MJSLMEndako Batholith - Stag Lakeplutonic suite - McKnab phasequartz dioritic intrusive rocks

EMJSPdSpike Peak intrusive suitedioritic intrusive rocks

Triassic to Jurassic

uTrJSsSitlika assemblage - clastic unitundivided sedimentary rocks

LTrJTpTTopley intrusive suite - TochchaLake stockdioritic intrusive rocks

Triassic

uTrT

Takla Groupv: undivided volcanic rocksva: andesitic volcanic rocksvb: basaltic volcanic rocksvl: coarse volcaniclastic andpyroclastic volcanic rocks

LTrgdunnamed granodioritic intrusiverocks

LTrB

Permian to Jurassic

PJCS

Cache Creek complex -Sowchea successionmudstone, siltstone, shale fineclastic sedimentary rocks

Permian to Triassic

PnTrCTusCache Creek complex -Trembleur ultramafite unitserpentinite ultramafic rocks

PTrCTumCache Creek complex -Trembleur ultramafite unitultramafic rocks

PTrCSvbCache Creek complex -Sowchea successionbasaltic volcanic rocks

PTrCRgs

Cache Creek complex -Rubyrock igneous complexgreenstone, greenschistmetamorphic rocks

Carboniferous to Permian

DPA

Asitka Groupgs: greenstone, greenschistmetamorphic rocksls: limestone, marble, calcareousrocks

Devonian to Triassic

DTrT

Taltapin metamorphic complexlower amphibolite/kyanite grademetamorphic rocksma: limestone, marble,calcareous sedimentary rocks

MINFILE Showing

Fault Road

Butterfield Lake intrusivecomplexgb: gabbroic to dioritic intrusive

rocksum: ultramafic rocks

CG

CG

YA

AX

AX

NAc

ST

WR

WR

AX

AX

AX

NAp

QN

QN

QN

NAc

m

NAp

CA

SMSM

SMSM

SMSM

YT

YT

CC

CDCD

BRBR

MTMT

MTMT

PRPR

CRCR

CKCK

BRBR

BRBR

CC

NAb

NAb

CA

OK

YT

Atlin

Nelson

Stewart

Terrace

Quesnel

Kelowna

Smithers

Victoria

Kamloops

Vancouver

PentictonCranbrook

Dease Lake

Revelstoke

Fort Nelson

Port Alberni

Dawson Creek

Williams Lake

Prince Rupert

Prince George

Fort St. John

Atlin

Nelson

Stewart

Terrace

Quesnel

Kelowna

Smithers

Victoria

Kamloops

Vancouver

PentictonCranbrook

Dease Lake

Revelstoke

Fort Nelson

Port Alberni

Dawson Creek

Williams Lake

Prince Rupert

Prince George

Fort St. John

116°W

116°W

124°W

124°W

132°W

132°W

58°N

58°N

54°N

54°N

50°N

50°N

0 100 200

kmCopyright © 2011

British Columbia Geological Survey

BRIT

ISH COLUM

BIA

GEO

LOGICAL SURV

EY

Coast

plutonic

complex

PacificOcean

Ala

ska

Yukon NWT

BC

Alb

erta

USA

eastern

limit

of

Cordilleran

deformation

Chugach

Cache Creek

Wrangellia

Alexander

Yukon-Tanana

Yakutat

Stikinia

Quesnellia

Coast complex

Pacic Rim

North America - platform

Methow

Kootenay

Cadwallader

Chilliwack

Crescent

Bridge River

Harrison Lake

Slide Mountain

AX

WR

CG

YA

YT

OK Okanagan

ST

QN

HA

CD

CK

MT

PR

CR

BR

SM

CC

m

NAb

NAp

North America - craton & cover

NAc

CassiarCA

Outboard

Insular

Intermontane

Ancestral North America

TERRANES

Location of study area. Geology from Colpron and Nelson (2011)

StudyArea

1

2

1

23

1

21

2

1

2

1

2

12

1

2

1 2

BL

FORTOWL

125°30'W

125°30'W

126°0'W

126°0'W

54°45'N 54°45'N

54°30'N 54°30'N

0 5 102.5Kilometres

Ice-Flow IndicatorsField Observations (Levson et al., 1999)

Striation(direction known)

Remote-sensing

Crag-and-tail(direction known)

Drumlin(direction known)

Drrumlinoid or fluting(direction unknown)

Striation(direction known)

Striation or groove(direction unknown)

2

1Striations with age relationship(direction known, 1 is oldest)

Interpreted Ice-Flow Direction

Early topographically controlled flows towards the southeast

Flows due to the development of ice-centre west of study area during glacial maximum

Southwest flows due to eastward shift of ice-centre during late glacial maximum

Babine

Lake SpeculariteLake

ButterfieldLake

PendletonBay

FlemingCreek

BCGS (182)

GSC (10)

Till Sample Locations2-3 kg, subglacial till

AbstractRegional till geochemical sampling in the Pendelton Bay area (NTS mapsheet 93K/12) has detected dispersal from known porphyry Cu±Mo±Au mineralization at the Fort showing (MINFILE 93K 093) and identified three new areas of geochemical interest. Situated 30 km southwest of the past producing porphyry Cu±Mo±Au Bell and Granisle mines, the Pendleton Bay area has potential to host new porphyry Cu±Mo±Au mineralization. However, access to the area is limited and glacial sediment cover is extensive. To better assess mineral potential here, 182 subglacial till samples were collected by the British Columbia Geological Survey in 1998 for geochemical analysis of the <63 µm size fraction by inductively coupled plasma emission spectroscopy (ICP-ES) and instrumental neutron activation analysis (INAA). Ice-flow features indicate that glacial dispersal was predominantly towards the east and southeast. The maximum Cu value (522 ppm Cu) is 700 m northeast of the main Fort showing, and

thanomalous values greater than the 90 percentile (60 ppm Cu) continue for about 2 km down ice (southeast). The Mo footprint in till at the Fort showing is smaller, with the maximum (29 ppm Mo) occurring 300 m to the northeast, and concentrations fall to near detection limit 800 m to the east. Three additional areas have been identified with anomalous values of Cu (up to 167 ppm), Cr (up to 263 ppm), and Ni (up to 101 ppm). These anomalies provide a starting point for future exploration work in the area.

Areas of geochemicalinterest

Regional geochemical dispersal

Summary Three new areas of geochemical interest have been

identified in Pendleton Bay map area that warrant follow up work.

Glacial dispersal in the area ranges from northeast to thsoutheast, and dispersal of >90 percentile Cu is

observed to extend at least 2 km from the Fort showing.

Geochemical data will be released in an upcoming Open File report.

ReferencesArnold, H., Ferbey, T., and Hickin, A., 2016. Ice-flow indicator compilation, British Columbia and Yukon. British Columbia Ministry of Energy and Mines, British Columbia Geological Survey Open File 2016-4, Geological Survey of Canada Open File 8083, 1:1,750,000 scale.

Cui, Y., Miller, D., Nixon, G., and Nelson, J., 2015. British Columbia digital geology. British Columbia Ministry of Energy and Mines, British Columbia Geological Survey Open File 2015-2, digital files.

Levson, V.M., 2002. Quaternary geology and till geochemistry of the Babine porphyry copper belt, British Columbia (NTS 93L/9, 16, M/1, 2, 7, 8). British Columbia Ministry of Energy and Mines, British Columbia Geological Survey Bulletin 110, 278 p.

Levson, V.M., Mate, D., and Stuart, A.J., 1999. Quaternary geology and drift prospecting studies in the north central Nechako Plateau (93F and K). In: Geological Fieldwork 1998, BC Ministry of Energy, Mines, and Petroleum Resources, British Columbia Geological Survey Paper 1999-1, pp. 16-23.

Plouffe, A., and Williams, S.P., 2001. Quaternary geology data: Manson River (93N), Fort Fraser (93K) and Nechako River (93F), central British Columbia. Geological Survey of Canada, Open File 2270, CD-ROM.

Introduction Till sampling in Pendleton Bay area has identified dispersal

from Fort porphyry Cu±Mo±Au showing and three new areas of geochemical interest.

Extensive till cover, and lack of historical exploration, makes the area ideal for the application of drift exploration methods to help discover new metallic mineralization.

Field work was carried out summer of 1998 (see Levson et al., 1999).

The Pendleton Bay area has potential to host porphyry Cu±Mo±Au mineralization similar to that at past-producing Bell (MINFILE 093M001) and Grainisle (MINFILE 093L146) mines, 30 km to the northeast.

The area is host to 3 documented MINFILE showings:

Ice-flow history Studies northwest of the map area identified that dispersal

was predominantly to the southeast (Levson, 2002).

Ice-flow indicators in the study area suggest ice-flow was mainly to the east and northeast. Topographically controlled flow towards the southeast is observed in parts of the study area, as are late southerly flows.

Till sampling for geochemistry 182 samples of subglacial till (2-3 kg) were collected at

average depth of 1 m below surface.

The <63 µm fraction was analyzed by - INAA at Actlabs; and - ICP-ES at ACME

This data set is supplemented by 10 subglacial till samples collected by the Geological Survey of Canada (Plouffe and Williams, 2001).

th th th th Geochemical maps were produced using 50 , 70 , 90 , 95 ,

thand 98 percentile class breaks.

0 5 102.5Kilometres

BL

FORT OWL

EEva

EO

lmJHSH

EEva

PJCSPTrCRgs

uTrTv

PTrCSvb

PTrCTum

PnTrCTus

uTrTvb

EMJSPd

DTrT

DTrT

EEva

LTrBgb

EEva

DPAgs

uTrTva

uTrJSs

lmJHvf

PTrCRgs

DTrTma

EEvl

MJSLM

MJSPsy

EGo

LTrJTpT

LTrgd

LTrgd

LTrJTpT

EGo

uTrTvlDPAls

DPAsf

EEvf

uTrTv

EEva

EMJSPd

EEvl

EEva

Babine

LakeSpecularite

Lake

ButterfieldLake

PendletonBay

FlemingCreek

125°30'W

125°30'W

126°0'W

126°0'W

54°45'N 54°45'N

54°30'N 54°30'N

0 5 102.5Kilometres

BL

FORT

OWL

EEva

EO

lmJHSH

EEva

PJCSPTrCRgs

uTrTv

PTrCSvb

PTrCTum

PnTrCTus

uTrTvb

EMJSPd

DTrT

DTrT

EEva

LTrBgb

EEva

DPAgs

uTrTva

uTrJSs

LTrBum

lmJHvf

PTrCRgs

DTrTma

EEvl

MJSLM

MJSPsy

EGo

LTrJTpT

LTrgd

LTrgd

LTrJTpT

EGo

uTrTvlDPAls

DPAsf

EEvf

uTrTv

EEva

EMJSPd

EEvl

EEva

Babine

Lake SpeculariteLake

ButterfieldLake

PendletonBay

FlemingCreek

1

2

3

4

1 Fort Showing: Maximum Cu (522 ppm) and thMo (29 ppm) for study. >98 percentile Zn, Cr,

th thand Ni, and >90 percentile As. >90 percentileCu continues 2 km southeast and 750 mnortheast.

2 South Specularite Lake area: Maximum Cr(452 ppm) and Ni (101 ppm) for study. Also

th thcontains >95 percentile Cu and >90 percentile Au.

3 South Butterfield Lake area: 3 samples over th2.5 km with up to >98 percentile Cu and

th thCr, >95 percentile Au, and >90 percentile Ni.

4thFleming Creek area: >98 percentile Ni and Au

thin one sample, >98 percentile Cu in a second.

Showing Deposit Type Commodities

BL 093K054 NA Cu

Fort 093K093 Cu, Ag, Mo, Pb, Zn, Au

OWL 093K103 Cu, Ag, Au, Zn, Pb

Porphyry Cu±Mo±Au (L04)

Cu±Ag quartz veins (I06)Porphyry Cu±Mo±Au (L04)

MINFILE No.

New till geochemical targets for potential porphyry Cu±Mo±Au mineralization in the Pendleton Bay area1 1 2A.L. Bustard , T. Ferbey , and V.M. Levson

1British Columbia Geological Survey, Victoria, BC, V8W 9N3 2Quaternary Geosciences, Victoria, BC, V8P 2Z8

G

YE EO VL RO UG SICAL

COLH US MIT BI IR A

B

British Columbia Geological SurveyGeoFile 2017-5

(Arnold et al., 2016) Observations

A.Bustard@gmail.com