Aquatic life may be at risk following the test results from sediment samples taken from the mouth of Hazeltine Creek and Raft Creek.
Saturday’s results released from the Ministry of Environment show the sediment exceeds three federal and provincial guidelines for copper which may pose adverse effects on aquatic life.
It is unknown if the elevated levels of copper detected is in a form that will affect the various life stages of fish in the lake.
Elevated levels of iron were also found in the samples.
The Ministry says the results pose no risk to human health and that further analysis of the sediment will continue.
The Mount Polley Mining Corporation submitted a comprehensive environmental impact assessment and action plan to the Ministry of Environment on Friday.