Ravenswood Model:
Ravenswood Domain
Towards a genetic model
for the
Ravenswood deposits
Gregg Morrison,
Klondike Exploration Services,
Alexei Nichols & Nick Lisowiec
Resolute Mining
KLONDIKE
CT Metallogenic:
Districts to Domains to Provinces
KLONDIKE
Ravenswood District:
Ravenswood Domain deposits
along the margin of
the S-D plutons
Au veins & dioritic
dikes Ravenswood,
district
Au veins & breccias
With plugs-stocks
In 3 Sisters District
Au-Cu-Te signature
Explored for
porphyry Cu-Au
KLONDIKE
Ravenswood District:
Ravenswood Domain magnetics
KLONDIKE
Ravenswood District:
Ravenswood Town Geology & RTP mag
KLONDIKE
Ravenswood District:
Ravenswood Town alteration
KLONDIKE
Ravenswood District:
Ravenswood Town dikes veins faults
KLONDIKE
Ravenswood District:
Ravenswood Town metal zoning
Centred on Area 4 Fault in Sarsfield pit
With the deepest mineralisation
Zoning of key metals up & out
Mushroom shape from to central feeder
and dispersion in re-activated structures
Zoning reflects declining temperature
Consistent with alteration zones
best ore shallow central
Ore by fluid decompression
At structure intersection
KLONDIKE
Ravenswood District:
Ravenswood
Looking NW (Mine Grid
West)
Vertical Buck Reef, Area
4 and Nolan's faults
(green)
SW dipping Keel fault
(pale yellow) with
associated shallow NE
dipping tension vein
arrays (purple)
Shallow SE and SW
dipping vein arrays at
Nolan's (extends into
Area 5 – light blue)
KLONDIKE
Ravenswood Mine Mineralisation Styles
•2 main styles of mineralisation in the Ravenswood
area:
• Chlorite-pyrite-silica-pyrrhotite fault
• veins/breccias (e.g. Buck Reef & Area 4).
• Chlorite-pyrrhotite breccia in BRW vs
• chlorite-pyrite-biotite veins in Sarsfield
• High grade quartz-sulphide fault vein
• and tension vein arrays (stockworks)
• typical of Sarsfield and Nolans
Ravenswood District:
Ravenswood veins
Mineralised quartz-sulphide veins tension & shear type
with narrow sericite alteration haloes in diorite & biotite altered andesite dike
KLONDIKE
Ravenswood District:
Ravenswood overall paragenesis
Host rock age 429Ma (JC Tonalite)
cut by 411Ma aplite dike in NE dipping shear
Cut by basaltic andesite dikes
Alteration age 310Ma+/- 5Ma (biotite & sericite)
Shear and tension vein arrays syn-to late shear
Fed by steep shears so overall mushroom shape ore zones
Au As Te Bi BM enrichment signature  IRGS mesozonal
system in mafic host rocks
Distinct metal zoning points at central feeder(s)
Evolved magmatic fluid phase separation at ore stage ~300°C
So where is the driving intrusion?
KLONDIKE
Ravenswood District:
Three Sisters geology
KLONDIKE
Ravenswood District - Three Sisters magnetic anomaly
Related to biotite- alteration around an inferred dioritic intrusion
KLONDIKE
Ravenswood District:
Three Sisters metal zoning
KLONDIKE
Ravenswood District:
Kitty O’Shea diorite complex
Kitty O’Shea
Diorite Complex
Ideal model
10km pluton
Radial dikes
Concentric dikes
Satellite plugs
Breccia & vein
occurrences
Far Fanning Mine,
Macalite breccia
scattered veins
Nice targets
KLONDIKE
Ravenswood District:
Ravenswood in IRGS model
Deep mesozonal veins
Possibly associated with
an unidentified dioritic stock
KLONDIKE