Geology and metallogeny of the Rice Lake area, southeast Manitoba: overview and synthesis Geology and metallogeny of the Rice Lake area, southeast Manitoba: overview and synthesis Manitoba Mining & Minerals Convention 2008: Gold in Manitoba Manitoba Mining & Minerals Convention 2008: Gold in Manitoba Scott Anderson Manitoba Geological Survey Scott Anderson Scott Anderson Manitoba Geological Survey Manitoba Geological Survey Rice Lake, looking north toward the Rice Lake mine
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Geology and metallogeny of the Rice Lake area, southeast ...€¦ · O x f o r d - S t u l Lake Winnipeg Northern Superior English R. Quetico Wawa L a k e S u p e r i o r I s l a
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Geology and metallogeny of the Rice Lake area, southeast Manitoba:
overview and synthesis
Geology and metallogeny of the Rice Lake area, southeast Manitoba:
overview and synthesis
Manitoba Mining & Minerals Convention 2008:Gold in Manitoba
Manitoba Mining & Minerals Convention 2008:Gold in Manitoba
Scott AndersonManitoba Geological Survey
Scott AndersonScott AndersonManitoba Geological SurveyManitoba Geological Survey
Rice Lake, looking northtoward the Rice Lake mine
Manito
baOntar
io
Wabigoon
Uchi
Winnipeg R.
Berens River
Oxford-Stull
LakeWinnipeg
Northern Superior
English R.
Quetico
WawaLake
pSu erior
Island L.
Munro
200 km
metavolcanic rocks of mainlyoceanic affinity
metavolcanic rocks of mainlycontinental affinity
and isotopic influence> 2.8 Ga continental terranes
Greenstone belts
3.9- 2.81 Ga Northern Superior superterrane 3.0 - 2.87 Ga North Caribou terrane3.4 - 2.8 Ga Winnipeg River terrane
metasedimentary and assoc.granitic rocks
granitoid rocks
Regional setting:Western Superior Province
Regional setting:Western Superior Province
North Caribou Terrane
North Caribou Terrane
RICE LAKE BELTRICE LAKE BELT
NATMAPNATMAP
• collage of continental andoceanic terranes(ca. 3.9-2.7 Ga)
• amalgamated via platetectonic processes
• terminal collisionca. 2.69-2.67 Ga
• collage of continental andoceanic terranes(ca. 3.9-2.7 Ga)
• amalgamated via platetectonic processes
• terminal collisionca. 2.69-2.67 Ga
Gold deposits:>50k oz. Au>1M oz. Au
Gold deposits:>50k oz. Au>1M oz. Au
• south margin of NCT• 3.0-2.7Ga subduction-accretion complex• north-verging subduction zone
• south margin of NCT• 3.0-2.7Ga subduction-accretion complex• north-verging subduction zone
* Percival et al., 2006: CJES, v. 43, p. 1085-1117.* Percival et al., 2006: CJES, v. 43, p. 1085-1117.
NCTNCTRegional setting:
Uchi SubprovinceRegional setting:
Uchi Subprovince
TerraneTerrane
NorthCaribou
Regional setting:Rice Lake greenstone belt
Regional setting:Rice Lake greenstone belt
NORTH CARIBOUNORTH CARIBOU
UCHIUCHI
ENGLISH RIVERENGLISH RIVER
• several Meso- and Neoarcheansupracrustal assemblages
• differing geology, age and chemistry• range in age from ca. 3.0 to 2.7 Ga
• several Meso- and Neoarcheansupracrustal assemblages
• differing geology, age and chemistry• range in age from ca. 3.0 to 2.7 Ga
Local geology: Rice Lake areaLocal geology: Rice Lake area
• Three supracrustal assemblages:Little Beaver (LBA)Bidou (BA; incl. RRPS)San Antonio (SAA)
• Crustal-scale Wanipigow SZLBA on north (NCT)BA and SAA on south (Uchi)
• Angular unconformity separatesBA in footwall from SAA inhangingwall
• Three supracrustal assemblages:Little Beaver (LBA)Bidou (BA; incl. RRPS)San Antonio (SAA)
• Crustal-scale Wanipigow SZLBA on north (NCT)BA and SAA on south (Uchi)
• Angular unconformity separatesBA in footwall from SAA inhangingwall
North CaribouTerrane
Rice Lake Au mineSan Gold #1 Au mineAu deposit, prospect
Rice Lake Au mineSan Gold #1 Au mineAu deposit, prospect
Bidou assemblage:arc to back-arc volcanism
(2.75-2.715 Ga)
Bidou assemblage:arc to back-arc volcanism
(2.75-2.715 Ga)
Schematiclithostratigraphy ofBidou assemblage
Schematiclithostratigraphy ofBidou assemblage
Four distinct lithostratigraphic units:• Independence Lake (IL)• Rainy Lake road (RLR)• Townsite (TS)• Round Lake (RL)
Four distinct lithostratigraphic units:• Independence Lake (IL)• Rainy Lake road (RLR)• Townsite (TS)• Round Lake (RL)
• quartz-carbonate veins• shear zone or fracture control • quartz, subordinate carbonate (ank>cal),
albite, chlorite, sericite• low-sulphide content (<5%)• pyrite; other sulphides negligible• free gold, assoc. with pyrite• high Au:Ag (>5:1)• low base metals and pathfinder
• evidence of wall-rock sulphidation• considerable depth extent (>2 km),
yet negligible variation
• quartz-carbonate veins• shear zone or fracture control • quartz, subordinate carbonate (ank>cal),
albite, chlorite, sericite• low-sulphide content (<5%)• pyrite; other sulphides negligible• free gold, assoc. with pyrite• high Au:Ag (>5:1)• low base metals and pathfinder
• evidence of wall-rock sulphidation• considerable depth extent (>2 km),
yet negligible variation
Dube et al., 2007Dube et al., 2007
Rice Lake district• first discovery of gold in Manitoba (1911)• several significant deposits• Rice Lake and SG-1 mines (San Gold Corp.)• Rice Lake deposit >2.3 million ounces Au
(production + reserves, resources)
Rice Lake district• first discovery of gold in Manitoba (1911)• several significant deposits• Rice Lake and SG-1 mines (San Gold Corp.)• Rice Lake deposit >2.3 million ounces Au