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Longitudinal faults and/or shears are common in the ultramafic rocks. Some of these
occur along lithological contacts. The most prominent of these is coincident with
Maple Creek. Hulbert (1997) describes two western faults as west-dipping reverse
faults.
7.2 M INERALIZATION
Mineralization on the Property occurs within the Quill Creek Complex. This variably
serpentinized, ultramafic-gabbroic body intrudes Permian sedimentary and volcanic
rocks. Historic exploration and development programs defined three zones of
gabbro-hosted massive and disseminated mineralization known as the East Zone,
West Zone and North Zone (Figure 7.4).
7.2.1 EAST ZONE
The two main gabbro-hosted zones of mineralization are the East and West Zones.
The East Zone has received the most detailed exploration, including 4,267 m of
underground development on seven levels, three internal shafts and over 500
surface and underground diamond drillholes. The East Zone is gently west-plunging
and moderately to steeply south-dipping and is in contact with Hasen Creek
Formation calcareous sediments. At the base of this zone of mineralized peridotite
re discontinuous massive sulphide lenses as well as skarn zones in calcareous
footwall. The mineralized portion of the East Zone has been outlined by surface and
underground diamond drilling over a strike length of 1,500 m and an average vertical
extent of 700 m (Figure 7.5).
East of section 3500E, the peridotite unit thicken up considerably with an average of
400 m horizontal width. Around section 3500E, there is a repeated sequence of
mineralized peridotite, footwall rocks from the Hasen Creek formation, and
mineralized peridotite. This indicates the potential for some form of thrust faulting.
This is also evident in the mineralized portion of the peridotite east of section 3500E,
where mineralized grade profiles in boreholes, drop off and then increase. No
significant faulting has been observed in the drill core to support this theory.
The East Zone was mined by Hudson Yukon Mining in 1972 and approximately
171,652 t at 2.23% nickel and 1.39% copper were extracted.
7.2.2 WEST ZONE
Hudson Yukon Mining discovered the West Zone. All-North’s 1987 drilling program
further outlined the zone, which extends over a strike length of 1,300 m and to a
vertical depth of about 400 m. This area is located above the base of the Quill Creek
Complex where its trend changes from northwest-southeast to east-west. The
majority of the mineralized zones occur in gabbro and in a blanket clinopyroxenite, as
is the case in the East Zone. However, mineralization also occurs to a considerable
Prophecy Platinum Corp. 7-6 1193460500-REP-R0001-02
Wellgreen Project Preliminary Economic Assessment,
Yukon, Canada