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|Apr 05||Technical Memo|
|Feb 14||4Q2016 Report for Permit 11678|
|Dec 23||Polley Flats Copper Geochemical Conceptual Model|
|Nov 10||3Q2016 Report for Permit 11678|
|Aug 11||2Q2016 Report for Permit 11678|
|Jun 30||Technical Memo on Sediment Deposition Assessment|
|Jun 21||Update Report: Post-Event Environmental Impact Assessment Report (83.60 Mb)|
|May 13||1Q2016 Report for Post-TSF Breach Monitoring Plan|
|Apr 8||Technical Memo on DGT Results|
|Feb 15||4Q2015 Report for Post-TSF Breach Monitoring Plan|
|Jan 7||Community Update|
|Dec||SRK Consulting: Update on Geochemical Characterization of Spilled Tailings|
|Nov||Short Term Water Discharge Permit|
|Nov||3Q2015 Report for Post-TSF Breach Monitoring Plan|
|Nov||Quesnel Lake Water Clarity at Lake Overturn - Fall 2015|
|Nov||Rehabilitation Strategy Update|
|Oct||Golder Report: Forest Conditions and Die-Back in Areas of Thicker Tailings Deposition|
|Sep||2Q2015 Report for Post TSF-Breach Monitoring Plan|
|Jul||Polley Lake Sampling Video|
|Jul||Interior Health Update: Remaining Water Use Restrictions Lifted|
|Jul||Province authorizes restricted re-start for Mount Polley Mine|
|Jun||Hazeltine Creek Rehabilitation Update Video|
|Jun||Post Event Environmental Impact Assessment Report (Summary)|
|Jun||Post Event Environmental Impact Assessment Report (Appendices A-I)|
|Jun||Water Quality Data|
|Apr||Rehabilitation of Hazeltine Creek Video|
|Apr||Approach for Long-Term Water Management Plan Development|
|Mar||Water Quality Sample Collection Location Map: Quesnel Lake & Polley Lake|
|Mar||Rehabilitation Strategy - Tailings Breach Update|
|Mar||Water Management Planning|
|Feb||Mount Polley Supports Scientific Research - Quesnel River Watershed|
|Feb||Rehabilitation Strategy - Tailings Breach|
|Feb||Early Life Stage Toxicity Test - Quesnel River Test Results|
|Jan||Summary of Mount Polley Toxicity Testing Program|
|Dec||Preliminary Results of the Geochemistry of Exposed Tailings along Hazeltine Creek|
|Dec||MPMC Supports Quesnel Lake Research|
|Nov||MOE Progress Report on Mount Polley Remediation|
|Nov||Quesnel Lake Cloudiness|
|Nov||Soil Quality Impact Assessment|
|Oct||Mining Processing Reagents|
|Oct||Sediment Quality Sample Collection Location Map: Quesnel Lake and Polley Lake|
|Oct||MPMC Responds to Vancouver Sun Article|
|Oct||Salmon Homing Behaviour, Fish Returns and the Potential for Olfactory Impacts from copper|
|Sep||Pre-breach sewage disposal at the mine site and implications for breach discharge|
|Sep||Lower Hazeltine Creek Erosion & Sediment Control Plan|
|Sep||MPMC Response to MoE Non-Compliance Order|
|Sep||What is Mount Polley Mine doing about turbid water|
|Sep||Comparison of Quesnel Lake Water to Water Quality Guidelines|
|Sep||Physical Limnology of Quesnel Lake|
|Aug||MoE Information Bulletin: Mount Polley Sediment & Water Quality Results|
|Aug||MoE Interactive Map of all types of Sampling|
A breach of the tailings storage facility (TSF) occurred at the Mount Polley mine on August 4, 2014 causing water and tailings to be released. Emergency protocol procedures were immediately enacted. The mill was shut down and placed on care and maintenance status.
The TSF breach caused physical impact to the downstream environment:
The estimated summary of materials released or displaced by the TSF breach:
Pollution Abatement Order No. 107461 (the Order) was issued to Mount Polley Mining Corporation (MPMC) by the Province of British Columbia on August 5, requiring MPMC to prepare and submit documentation describing its response, and provide communications to the Ministry of Environment (MOE) regarding response progress. A Conceptual Interim Erosion and Sediment Control Plan (the Plan) for mitigating ongoing erosion and sediment transport within impacted areas downstream of the breach was submitted by MPMC. Specific objectives of the Plan are summarized as:
Three high priority areas were identified where in-stream controls were planned to mitigate potential future erosion and/or sediment transport:
Rock berms were constructed upstream of the breach area to secure the remaining tailings in the TSF and to collect surface water. Repair of the breach to prevent any release of tailings with the spring runoff was completed in 2Q2015. The water level of Polly Lake rose 1.7 metres when a portion of the water from the breach became trapped by a plug of material at the outlet to the lake. The water was pumped out of Polley Lake and into Hazeltine Creek. The outlet of Polley Lake was subsequently restored to reconnect Polley Lake to Hazeltine Creek.
Best Management Practices were implemented over the remaining areas of impact to reduce potential for erosion of and sediment migration from Hazeltine Creek. The Plan was implemented in cooperation with the MOE, subject to completing ongoing designs and site inspections to confirm details and design standards.
Rehabilitation of Hazeltine Creek included reconstruction of the channel, and restoration of riparian habitat along the creek banks. A set of sedimentation ponds were constructed in the lower reaches of Hazeltine Creek to remove suspended solids from the water before entering into Quesnel Lake. An ongoing revegetation program will reestablish a productive ecosystem, and for water management in order to control sedimentation. The rehabilitation also includes the establishment of spawning and rearing habitat for fish.
The rehabilitation strategy summary is subject to change and is updated from time to time. MPMC provides the community and local First Nations with updates and information on the progress of our rehabilitation on an ongoing basis.
Rehabilitation plans normally take shape after sources and discharges are controlled, and after an assessment of impacts has been done. MPMC is providing the community and local First Nations with updates on the progress of our rehabilitation. The rehabilitation strategy summary is subject to change and will be updated from time to time.
Environmental monitoring and data collection includes water chemistry at sampling stations in Quesnel Lake, Polley Lake, Hazeltine Creek and the Quesnel River. The monitoring program also includes geochemical, physical limnology and biological testing. Water sampling has concluded affected areas were not toxic to aquatic life. Water quality information has been communicated to the local community and stakeholders on a regular basis.
Golder Associates completed a Post Event Environmental Impact Assessment—Key Findings Report for MPMC in June 2015. The report provided an assessment of the physical, chemical and biological impacts immediately following the TSF breach, and in the first 6-8 months following. The assessment of any long term impacts will continue, and results will be updated on a regular basis.permit amendments on July 9, 2015 from the Ministry of Energy and Mines and MOE which allowed for a modified operation plan to process a maximum of 4 million tonnes of ore over a period of up to one year. During the modified operation plan, ore is being mined from the Cariboo pit and the Boundary zone underground workings, and tailings are being stored in the Springer pit. An application was filed in March 2016 and is in the review process to permit the resumption of normal operations at Mount Polley, and for use of the TSF when the temporary permit expires in spring 2016. The Mount Polley mine is important to the regional economy as the mine and its employees play a substantial role in the economy and fabric of the surrounding communities. Throughout the rehabilitation, resumption of operations, and current permit application, MPMC management and staff have and will continue to work closely with the local communities and are appreciative of their ongoing support.
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Imperial Metals Corporation has provided links and references to several other web sites which are arms-length to the Company. Imperial Metals Corporation has no control over information at sites hyperlinked or referred to in this web site. These links and references are being provided for the convenience of the users of this web site and the Company does not endorse and is not responsible or liable for the content, nature or reliability of any linked or referenced web site or any link contained in a linked or referenced web site. Please be aware that in linking or going to these outside web sites, you are leaving the Imperial Metals Corporation website and that Imperial Metals Corporation is not responsible for the content of any other site.