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Tailings and mill concentrate samples were evaluated for acid rock drainage (ADR)
characteristics and leachable metals. All samples had a neutralization potential
(NP)/maximum potential acidity (MPA) ratio of less than 1, which is likely to be acid
producing. All tailings samples exceeded the Canadian Council of Ministers of the
Environment (CCME) Canadian Soil Quality Guidelines for the Protection of
Environmental and Human Health Guidelines for nickel and copper. Approximately
1.5 to 2 ha of the tailings are exposed to air and not underwater. Evidence of tailings
were located in vegetated areas down gradient and outside of the tailings compound.
This migration is believed to be the result of flooding; therefore, moving tailings to
areas outside of the compound in 1988. This is observed in low laying areas
surrounding the mill area.
Water quality samples were collected from water within the tailings compound in
2008. None of the samples exceeded the YCSR for aquatic life. One water sample
characterizing the water to be removed from the tailings management area was
collected in 2009. The sample exceeded the YCSR for aquatic life for cadmium,
cobalt, copper, lead, molybdenum and zinc.
Soil samples were collected on site in 2009 in two areas identified as areas of
potential concern, vehicle battery storage area and area of hydrocarbon staining. All
three soil samples collected from the vehicle battery storage area exceeded the
YCSR Soil Standards – Generic Numerical for lead and two samples exceeded the
YCSR Industrial Soil Standards – Toxicity to Soil Invertebrates and Plants for
antimony. Seven of the eight locations of hydrocarbon staining sampled exceeded
the YCSR for petroleum hydrocarbons.
WELLGREEN PROPERTY – RECLAMATION PROGRESS REPORT
In 2011, Access Consulting provided a report outlining the activities that were
completed as a condition of the 2009 Reclamation Plan. Work in two main focus
areas was completed in 2010 and 2011; tailings pond monitoring and reclamation
work.
Sampling of the tailings pond was completed twice annually, in June and August.
YCSR standards for aquatic life exceedences were reported for total copper, cobalt,
nickel concentrations at one sampling location, WGN-WQS3 in June 2010. In
August 2010, exceedence for total cobalt and nickel were reported at two sampling
locations, WGN-WQS2 and WGN-WQS3. No exceedences were reported in 2011.
All exceedences were observed when water levels within the tailings pond were low
and not decanting through the dam culvert.
As part of the reclamation work, several tests pits for removal of petroleum
hydrocarbons, and antimony and lead contamination were completed. All petroleum
hydrocarbon soil was removed from site and confirmatory samples were collected on
all sides of the excavation. Sampling of soil potentially contaminated with lead and
antimony was completed during 2010 and 2011. All contaminated soil was removed
from situ and placed on-site on a sheet of plastic and covered. The soil remains on
Prophecy Platinum Corp. 20-3 1193460500-REP-R0001-02
Wellgreen Project Preliminary Economic Assessment,
Yukon, Canada