Geology and Mineralization of the Golden Saddle Gold Deposit ...
Geology and Mineralization of the Golden Saddle Gold Deposit ...
Geology and Mineralization of the Golden Saddle Gold Deposit ...
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<strong>Geology</strong> <strong>and</strong> <strong>Mineralization</strong> <strong>of</strong><br />
<strong>the</strong> <strong><strong>Gold</strong>en</strong> <strong>Saddle</strong> <strong>Gold</strong> <strong>Deposit</strong>,<br />
White <strong>Gold</strong> District<br />
Nov 21, 2012<br />
Leif Bailey MSc. C<strong>and</strong>idate<br />
University <strong>of</strong> British Columbia, Mineral <strong>Deposit</strong> Research Unit
Location Map
The <strong><strong>Gold</strong>en</strong> <strong>Saddle</strong> <strong>Deposit</strong><br />
Discovery Trench: 40 m @ 1 g/t Au<br />
Discovery Hole: 18 m @ 4.35 g/t Au<br />
2009 I&I Resource @ 0.5 g/t cut<strong>of</strong>f:<br />
~1.5 Millon oz Au @ ~ 3 g/t Au<br />
Significant Drill Intercepts Include:<br />
WD09-29: 60 m @ 3.89 g/t Au<br />
WD09-31: 104 m @ 3.39 g/t Au<br />
WD09-43: 106 m @ 2.29 g/t Au<br />
WD09-47: 31 m @ 9.20 g/t Au
Regional <strong>Geology</strong><br />
Outline <strong>of</strong> <strong>Deposit</strong> Area Map
Rock Types<br />
1 cm<br />
Quartz-Feldspar Augen<br />
Orthogneiss<br />
1 cm<br />
Garnet Amphibolite<br />
1 cm<br />
Biotite-Quartz Paragneiss<br />
1 cm<br />
B<strong>and</strong>ed Quartzite
Regional <strong>Geology</strong><br />
Outline <strong>of</strong> <strong>Deposit</strong> Area Map
Regional <strong>Mineralization</strong>
Fault-Controlled <strong>Mineralization</strong><br />
>95 th percentile<br />
Ag+As+Bi+Cu+Mo
<strong>Gold</strong> <strong>Mineralization</strong><br />
Pyrite Veinlet<br />
Pyrite Cement Breccia<br />
Quartz+Carb Veins<br />
Late Py-Bearing Fracture<br />
within Quartz Vein
Syn-Mineral Deformation: Early Ductile Kink Folds<br />
Sericite-Carbonate<br />
Alteration<br />
Quartz-K-feldspar<br />
Alteration<br />
1 cm 1 cm
Syn-Mineral Deformation: Late Brittle Fracturing<br />
Quartz-Carbonate-Sericite-Pyrite-Au Vein<br />
1 cm<br />
S 4<br />
S 2<br />
S 4<br />
1 cm
Syn-Mineral Ductile Folding <strong>and</strong> Brittle Extension<br />
Kink Fold, Stylolite, <strong>and</strong> Dilational Vein<br />
1 cm
Structural Control on <strong>Mineralization</strong> at Many Scales<br />
1 cm<br />
2 km<br />
> 15 ppb Au in soil<br />
> 50 ppb Au in soil
Regional Syn-Deformational <strong>Mineralization</strong><br />
<strong><strong>Gold</strong>en</strong> <strong>Saddle</strong><br />
Zone<br />
JP Ross – Henderson Creek<br />
Area<br />
Sheba Vein – Klondike<br />
District
<strong>Deposit</strong> <strong>Geology</strong>
Cross Section through <strong>Deposit</strong><br />
Section Line 5450, looking to <strong>the</strong> nor<strong>the</strong>ast
Fault-Hosted <strong>Mineralization</strong>
Fault-Hosted <strong>Mineralization</strong><br />
Multi-phase Fractures <strong>and</strong> Veins<br />
1 cm
Fault-Hosted <strong>Mineralization</strong><br />
Qtz-Py-Au Vein Breccia<br />
1 cm
Fault-Hosted <strong>Mineralization</strong><br />
Crack-Seal Quartz Veining<br />
1 cm
Fault-Hosted <strong>Mineralization</strong><br />
Late Py-Bearing Fracture within Quartz Vein<br />
1 cm
Paragenetically-Late Pyrite <strong>and</strong> <strong>Gold</strong> <strong>Mineralization</strong><br />
Type 1 <strong>Gold</strong> (Inclusions)<br />
Type 2 <strong>Gold</strong> (Fracture Filling)<br />
20 µm 10 µm
Minerals Paragenetically Related to <strong>Gold</strong><br />
Pyrite<br />
Silver Tellurides, Galena, Molybdenite,<br />
Chalcopyrite, Tetrahedrite-Tennantite<br />
Quartz, Feldspar, Barite, Ankerite,<br />
Dolomite, Calcite, Sericite, Illite,
Lithologic Control on Alteration<br />
Quartz-Kfeldspar Orthogneiss<br />
Kfeldspar, Albite, Barite,<br />
Galena, Molybdenite<br />
Biotite-Garnet Amphibolite<br />
Chlorite, Epidote, Chalcopyrite<br />
Fresh<br />
Altered
Lithologic Control on Alteration<br />
Carbonaceous Metasediments<br />
Graphite, Arsenopyrite,<br />
Pyrrhotite<br />
Pyroxenite<br />
Chlorite, Phlogopite, Fuchsite,<br />
Magnesite, Chalcopyrite<br />
Fresh<br />
Altered
Lithologic Control on Pathfinder Elements for Au<br />
Au ppm Ag ppm Mo ppm As ppm Sb ppm S % Ba ppm Cu ppm
Lithologic Controls on Deformation Style<br />
Feldspar Augen Orthogneiss<br />
Biotite-Quartz Schist<br />
INCREASING DEFORMATION<br />
Pyritic Breccia (13.3 g/t Au)<br />
Barren Micaceous Shear Zone<br />
Brittle Deformation (+ Permeability)<br />
Ductile Deformation
Geologic Model, part 1<br />
Pre-mineral configuration <strong>of</strong> rock packages
Geologic Model, part 2<br />
Inception <strong>of</strong> ductile shear zone<br />
Circulation <strong>of</strong><br />
fluid
Geologic Model, part 3<br />
Transition from ductile to brittle deformation,<br />
local extension within compressional setting
Geologic Model, part 4<br />
Brittle sinistral faulting, brecciation, fracturing,<br />
<strong>and</strong> veining
Key Implications for Exploration<br />
• Host rock composition imposes an important control on <strong>the</strong> structural<br />
style, texture, mineralogy, <strong>and</strong> pathfinder elements related to gold<br />
mineralization.<br />
• The distribution <strong>of</strong> mineralization is controlled by pre- <strong>and</strong> syn-mineral<br />
faults; <strong>the</strong> mineral <strong>and</strong> chemical “footprint” <strong>of</strong> mineralization is narrow.<br />
• The <strong><strong>Gold</strong>en</strong> <strong>Saddle</strong> deposit is located at an uncommon intersection<br />
<strong>of</strong> several geological <strong>and</strong> structural features; similar intersections are<br />
likely prospective.
Thank You<br />
S<strong>and</strong>ra Bayliss<br />
Mike Cooley<br />
Rob Creaser<br />
Graeme Davis<br />
Asa East<br />
Dave Emmons<br />
Kristen Feige<br />
Keith Fowlow<br />
Janet Gabites<br />
Jodie Gibson<br />
Lucy Hollis<br />
Natalie King<br />
Jean-Pierre Londero<br />
Doug MacKenzie<br />
Jim Ryan<br />
Kim Schmidt<br />
Cristen Symes<br />
Hanne-Kristin Paulsen<br />
Howard Poulsen<br />
April Vuletich<br />
And The MDRU Yukon <strong>Gold</strong> Project<br />
Crew <strong>and</strong> Sponsors<br />
Stay tuned for<br />
publications in 2013
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