The Rice Lake greenstone belt:geology overview and update

of MGS activities

The Rice Lake greenstone belt:The Rice Lake greenstone belt:geology overview and update geology overview and update

of MGS activitiesof MGS activities

Manitoba Mining & Minerals Convention 2007Manitoba Mining & Minerals Convention 2007

Scott AndersonManitoba Geological Survey

Scott AndersonScott AndersonManitoba Geological SurveyManitoba Geological Survey

Sunrise, Gem Lake

PresentationoutlinePresentationoutline

• Regional setting• Regional setting

Banksian L.

• Local geology;lithotectonic assemblages

• Local geology;lithotectonic assemblages

• Structural evolution• Structural evolution

• Metallogeny and exploration potential• Metallogeny and exploration potential

• Recent exploration• Recent exploration

• Ongoing MGS activities• Ongoing MGS activities

SanGold #3 zone

Manigotagan R.

Manit

oba

Ontar

io

Wabigoon

Uchi

Winnipeg R.

Berens River

Oxford-Stull

LakeWinnipeg

Northern Superior

English R.

Quetico

WawaLak

e

pSu erior

Island L.

Munro

3.5- 2.81 Ga Northern Superior superterrane

3.0 - 2.87 Ga North Caribou terrane3.17 - 2.81 Ga Winnipeg River terrane

Mainly oceanic affinity

Mainly continental affinity

Meta-sedimentary belt

Granitoid rocks

> 2.8 Ga continental terranes and isotopic influence

Greenstone belts

200 km

Manit

oba

Ontar

io

Wabigoon

Uchi

Winnipeg R.

Berens River

Oxford-Stull

LakeWinnipeg

Northern Superior

English R.

Quetico

WawaLak

e

pSu erior

Island L.

Munro

3.5- 2.81 Ga Northern Superior superterrane

3.0 - 2.87 Ga North Caribou terrane3.17 - 2.81 Ga Winnipeg River terrane

Mainly oceanic affinity

Mainly continental affinity

Meta-sedimentary belt

Granitoid rocks

> 2.8 Ga continental terranes and isotopic influence

Greenstone belts

200 km

Western SuperiorProvince:

regional setting

Western SuperiorProvince:

regional setting

Western Superior Province• Prolific host to

Orogenic Au• Also hosts:

VHMS Cu-Pb-Zn(Au,Ag)Magmatic Ni-Cu-PGEPegmatite Li-Cs-Ta

Western Superior Province• Prolific host to

Orogenic Au• Also hosts:

VHMS Cu-Pb-Zn(Au,Ag)Magmatic Ni-Cu-PGEPegmatite Li-Cs-Ta

NCTNCT

RICE LAKE BELTRICE LAKE BELT

RED LAKE BELTRED LAKE BELT

NATMAPNATMAP

ERBERB

• north-verging subductionaccretion complex alongsouth margin of NCT

• north-verging subductionaccretion complex alongsouth margin of NCT

UCHIUCHI

* Percival et al., 2006: CJES, v. 43, p. 1085-1117.* Percival et al., 2006: CJES, v. 43, p. 1085-1117.

NCTNCT

Rice Lake belt: general geologyRice Lake belt: general geology

NORTH CARIBOUNORTH CARIBOU

UCHIUCHI

ENGLISH RIVERENGLISH RIVER

Wallace assemblage• quartzite, conglomerate,

iron formation, carbonate,komatiite

• 2.92 Ga (Davis, 1994; Sasseville et al., 2006)• shallow subaqueous

continental platform

Wallace assemblage• quartzite, conglomerate,

iron formation, carbonate,komatiite

• 2.92 Ga (Davis, 1994; Sasseville et al., 2006)• shallow subaqueous

continental platform

Initial rifting of NCT (ca. 3.0 Ga)Initial rifting of NCT (ca. 3.0 Ga)

Red Lake equivalent: BalmerRed Lake equivalent: BalmerBedded calcsilicateBedded calcsilicate

Fuchsitic quartziteFuchsitic quartzite

T. CorkeryT. Corkery

A. BailesA. Bailes

Northward subduction and plumemagmatism beneath NCT margin

Northward subduction and plumemagmatism beneath NCT margin

Dacite brecciaDacite breccia

Spinifex komatiiteSpinifex komatiite

Red Lake equivalent:Bruce Channel/Trout Bay

Red Lake equivalent:Bruce Channel/Trout Bay

Garner assemblage• CA dacite, layered ultramafic

intrusion, iron formation,komatiite to Mg-THOL basalt

• ca. 2.87-2.90 Ga (Davis, 1994;Anderson, unpubl.)

• subaqueous continental arcto intra-arc basin

Garner assemblage• CA dacite, layered ultramafic

intrusion, iron formation,komatiite to Mg-THOL basalt

• ca. 2.87-2.90 Ga (Davis, 1994;Anderson, unpubl.)

• subaqueous continental arcto intra-arc basin

Andesite-dacite brecciaAndesite-dacite breccia

Arc – back-arc complex; northward subduction

beneath NCT margin

Arc – back-arc complex; northward subduction

beneath NCT margin

Bidou assemblage• Mg-THOL basalt, epiclastic

rocks, gabbro• 2.724-2.745 Ga (Anderson, unpubl.)• CA dacite, andesite, basalt;

epiclastic rocks, gabbro• 2.715-2.73 Ga (Turek et al., 1989;

Anderson, unpubl.)• subaqueous marginal-arc

and back-arc basin

Bidou assemblage• Mg-THOL basalt, epiclastic

rocks, gabbro• 2.724-2.745 Ga (Anderson, unpubl.)• CA dacite, andesite, basalt;

epiclastic rocks, gabbro• 2.715-2.73 Ga (Turek et al., 1989;

Anderson, unpubl.)• subaqueous marginal-arc

and back-arc basin

Pillowed basaltPillowed basalt Greywacke and chertGreywacke and chert

Red Lake equivalent: Confederation Red Lake equivalent: Confederation

Restricted extensional basin in Bidou arc

Restricted extensional basin in Bidou arc

Gem assemblage• trans. CA-THOL rhyolite,

dacite, basaltic andesite;epiclastic rocks

• ca. 2.72 Ga (Davis, 1994; Anderson, unpubl.)

• subaerial to shallow-subaqueous arc-rift setting

Gem assemblage• trans. CA-THOL rhyolite,

dacite, basaltic andesite;epiclastic rocks

• ca. 2.72 Ga (Davis, 1994; Anderson, unpubl.)

• subaerial to shallow-subaqueous arc-rift setting

Flow-banded rhyoliteFlow-banded rhyolite

Rhyolite flow-lobe brecciaRhyolite flow-lobe brecciaUchi equivalent: St. Joseph(?) Uchi equivalent: St. Joseph(?)

Edmunds assemblage• proximal equivalent to ERB

metasedimentary rocks• turbiditic greywacke, mudstone,

conglomerate, iron formation• 2.696 Ga (McNicoll and Rogers, unpubl.)• marine-deltaic setting

Edmunds assemblage• proximal equivalent to ERB

metasedimentary rocks• turbiditic greywacke, mudstone,

conglomerate, iron formation• 2.696 Ga (McNicoll and Rogers, unpubl.)• marine-deltaic setting

Polymictic conglomeratePolymictic conglomerate

Greywacke-mudstone turbiditesGreywacke-mudstone turbidites

Uchi equivalent: none known? Uchi equivalent: none known?

Post-accretion, pre-orogenicdenudation of NCT margin

Post-accretion, pre-orogenicdenudation of NCT margin

San Antonio assemblage• quartz greywacke, quartzite,

conglomerate, turbiditicgreywacke

•

Structural evolution: central Rice Lake beltStructural evolution: central Rice Lake belt* PMAP2005-1

SAASAA

Angular unconformity (G1)Angular unconformity (G1)

G2 thrustG2 thrust

G3 foldsG3 folds

G4-G5 high-strain zonesG4-G5 high-strain zonesG4-G5 high-strain zonesG4-G5 high-strain zones

G6 foldG6 fold

Protracted (ca. 300 Ma) magmaticand depositional history

+Complex structural

evolution=

Favourable metallogenicsetting

Protracted (ca. 300 Ma) magmaticand depositional history

+Complex structural

evolution=

Favourable metallogenicsetting

Orogenic lode-goldOrogenic lode-gold

Dube et al., 2007Dube et al., 2007

Significant gold endowment:• over 200 occurrences• 5 significant producers (>50k ounces);

over 1.7 million ounces total production• Rice Lake deposit (~2.3 million ounces)• multiple styles of mineralization

Significant gold endowment:• over 200 occurrences• 5 significant producers (>50k ounces);

over 1.7 million ounces total production• Rice Lake deposit (~2.3 million ounces)• multiple styles of mineralization

Favourable setting:• accretionary plate-margin• crustal scale faults• regional greenschist-facies metamorphism• extensive CO2 alteration• chemically favourable rock-types• complex stratigraphy and structure

Favourable setting:• accretionary plate-margin• crustal scale faults• regional greenschist-facies metamorphism• extensive CO2 alteration• chemically favourable rock-types• complex stratigraphy and structure

Base metalsBase metals

Pyroxeniteintrusion brecciaWeber, 1990

Pyroxeniteintrusion brecciaWeber, 1990

Magmatic Ni-Cu-PGE • English L., Jeep, Garner

intrusions• mafic to ultramafic layered

intrusions or complexintrusion breccias

• Jeep and English Lakeoccurrences

Magmatic Ni-Cu-PGE • English L., Jeep, Garner

intrusions• mafic to ultramafic layered

intrusions or complexintrusion breccias

• Jeep and English Lakeoccurrences

FIII high-silicarhyolite dome (Gem)

FIII high-silicarhyolite dome (Gem)

VHMS-stylemineralization (Bidou)

VHMS-stylemineralization (Bidou)

Volcanic-hosted massive sulphide• Bidou and Gem assemblages• restricted back-arc or arc-rift basins• evidence of synvolcanic

alteration, exhalites, sulphideoccurrences (in-situ or clasts)

Volcanic-hosted massive sulphide• Bidou and Gem assemblages• restricted back-arc or arc-rift basins• evidence of synvolcanic

alteration, exhalites, sulphideoccurrences (in-situ or clasts)

SpinifexkomatiiteSpinifexkomatiite

CSIRO, 2004CSIRO, 2004

Komatiite Ni• Wallace and Garner assemblages• ultramafic (komatiitic) flow

complexes with interlayeredsulphidic sedimentary rocks

• no known occurrences

Komatiite Ni• Wallace and Garner assemblages• ultramafic (komatiitic) flow

complexes with interlayeredsulphidic sedimentary rocks

• no known occurrences

Sulphidic IFSulphidic IFKambalda/Raglan-typeKambalda/Raglan-type

Rice Lake belt:ongoing explorationRice Lake belt:ongoing exploration

Central MBCentral MB

AngelinaBanksianAngelinaBanksian

English L.English L.

GoldridgeGoldridge

Red Rice L.Red Rice L.

Rio-SaxtonMike PowerPoundmakerJeep

Rio-SaxtonMike PowerPoundmakerJeep

SG1GabrielleGreenbeltOro Grande-Gunnar

SG1GabrielleGreenbeltOro Grande-Gunnar

Magmatic Ni-PGE

Orogenic gold

Magmatic Ni-PGE

Orogenic gold

Lesavage N.Moore L.Lesavage N.Moore L.

MGS activities 2007:Geological context of lode-gold

occurrences in the Lily Lake area

MGS activities 2007:Geological context of lode-gold

occurrences in the Lily Lake area

Principal results:• Distinctive stratigraphic affiliation:

- quartz-greywacke turbidites- iron formation- polymictic conglomerate- mafic intrusive/extrusive

• Spatial association with zones ofstructural complexity

• Three styles of mineralization:- shear-hosted quartz veins- STWK / BX / wall-rock dissem.- sulphidized iron formation

• Analogous gold districts:- Beardmore-Geraldton, ON- Eleonore, QC- Meliadine trend, NU

Principal results:• Distinctive stratigraphic affiliation:

- quartz-greywacke turbidites- iron formation- polymictic conglomerate- mafic intrusive/extrusive

• Spatial association with zones ofstructural complexity

• Three styles of mineralization:- shear-hosted quartz veins- STWK / BX / wall-rock dissem.- sulphidized iron formation

• Analogous gold districts:- Beardmore-Geraldton, ON- Eleonore, QC- Meliadine trend, NU

** see Report GS-11 **R of A 2007

** see Report GS-11 **R of A 2007

3096E shear vein’16-type’

3096E shear vein’16-type’

MGS activities 2007:Structural controls and timing

of vein emplacement

MGS activities 2007:Structural controls and timing

of vein emplacement

2902 breccia vein’38-type’

2902 breccia vein’38-type’

Unresolved questions:1) Relationship of the

38- and 16-type veins?2) Controls on vein

emplacement?3) Timing of vein-emplacement

relative to the regional deformations?

Unresolved questions:1) Relationship of the

38- and 16-type veins?2) Controls on vein

emplacement?3) Timing of vein-emplacement

relative to the regional deformations?

** see Poster T2 **Convention Floor** see Poster T2 **Convention Floor

38-type

38-type 16-type16-type

ConclusionsConclusions

• ca. 300 million year history• ca. 300 million year history

• continental-arc / marginal oceanic-arc to back-arc / arc-rift settings

• continental-arc / marginal oceanic-arc to back-arc / arc-rift settings

• indications of significant potential formagmatic Ni-Cu-PGE, komatiite Ni, VHMS Cu-Pb-Zn(Au,Ag)

• indications of significant potential formagmatic Ni-Cu-PGE, komatiite Ni, VHMS Cu-Pb-Zn(Au,Ag)

• complex deformational history associated withca. 2.69 Ga continent-continent collision

• complex deformational history associated withca. 2.69 Ga continent-continent collision

• minimal systematic modern exploration• minimal systematic modern exploration

• north-verging subduction / accretion complex• north-verging subduction / accretion complex

• demonstrated potential for major orogenic lode-gold deposits• demonstrated potential for major orogenic lode-gold deposits

Rice Lake greenstone belt:Rice Lake greenstone belt:

A-shaft headframeRice Lake mineA-shaft headframeRice Lake mine

2998W vein“High-grade zone”2998W vein“High-grade zone”

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