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to help inform rehabilitation work in affected areas. The ERA considered levels of metal contaminants in the soil, water, and sediment. Territorial and
Aquatic risk assessments were concluded as part of the investigative work of the report. The report found excess concentrations of copper and vanadium in the soil however it was determined that the tailings were not acid generating and were unlikely to leach metals. The ERA determined the cause of some tree death post-breach and attributed a root smothering effect of the tailings effluent in the forested region. It was determined that tailings decreased soil aeration causing a poor environment for soil biota to support tree growth and survival. The food chain of local wildlife was modeled to determine if copper and vanadium exceeded standards. The cumulative dose according to these models was determined to be below a conservative threshold for most wildlife species. The report concluded low risk associated with copper and vanadium contamination. The bioavailability of the metals was likewise determined to be low. As part of the aquatic risk assessment, copper and arsenic were investigated in the sediment, while copper was the contaminant of potential concern investigated in the water of Polley Lake, Hazeltine Creek, Quesnel Lake, and Quesnel River. It was determined that copper levels decreased below the accepted guideline through 2015 in both lakes and Quesnel River, but not in Hazeltine Creek which was the site of active remediation and restructuring. The plants, water-column invertebrates, and fish in Polley Lake and Quesnel Lake are not expected to face long-term effects of the 2014 breach, according to ERA report. Likewise, risk to fish-consuming wildlife was also determined to be low. The deep ecological
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determined that the environmental effect of the dam breach and tailing spill was the physical disruption of the effluents rather than chemical. MPMC turned its remediation focus to restoring the physical state of the affected sites. The remediation efforts include ongoing planting of trees and shrubs that are native to the local ecosystem in the riparian and upland areas along
Hazeltine Creek. The Mount Polley remediation efforts have replanted 600,000 trees and shrubs to date. The risk from chemical contamination on the site was determined to be low to very low in the relevant terrestrial and aquatic environments. Remediation efforts also repaired 400 metres of shoreline at Quesnel Lake and installed new fish habitats at that site. New wetlands were also installed at the site next to the tailings pond failure.
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hired to study the impact of the spill from the tailings dam. This team studied where tailings effluent was deposited on land and in surrounding water environments, in particular how the bottom of
Quesnel Lake was affected and how the structures of Hazeltine and Edney creeks had changed. Chemical studies studied soil, water and sediment changes, while biological studies were focused on the effect of aquatic plant and animal life, in particular those at the sediment layer. Biological assessment also studied soil-dependent biota in the areas surrounding Quesnel Lake and Polley Lake.
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flow study to determine an ideal range and the annual mean for natural habitats was completed before construction of rock weirs and habitat features. Planting on the floodplain, to continue over subsequent years had also begun. Repairs to the mouth of lower Edney Creek was completed connecting the waterway to
Quesnel Lake. By the spring of 2015, remediation work had installed a new fish habitat at lower Edney Creek. Successful spawning of interior Coho, Kokanee and Sockeye Salmon was accomplished. By May, a new channel for Hazeltine Creek was completed.
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workers, about 40 of the mine's approximately 300 workers demanded to reopen the mine. a spokesman at the
Ministry of Mine said operations would require permits and approvals and could only go ahead after a rigorous review. The primary phase of the restoration and remediation strategy implemented work to reduce the environmental effect on Quesnel Lake.
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residents, leaving a boiling water advisory, and narrowing the "Do Not Use" order to Polley Lake, Hazeltine Creek, and an area within 100 metres (330 ft) of the shoreline sediment deposit, where
Hazeltine Creek runs into Quesnel Lake. Initial tests at five testing sites of the second water test run indicated
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communities. The application also underwent a full technical review from the
Cariboo Mine Development Review Committee (CMDRC), which includes representatives from provincial and federal agencies, First Nations, local governments (City of Williams Lake and Cariboo Regional District), and the community of Likely.
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The HHRA report was published in May. The
Ecological Risk Assessment (ERA) report was published in December and detailed the work done by Golder to understand the ecological significance of the tailings dam breach of 2014. The ERA report was completed as a component of the MPMC's remediation strategy
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The report concluded that Polley Lake, Hazeltine Creek and a small portion of
Quesnel Lake were physically affected by the tailings dam breach. The chemical testing on the tailings mixture was determined to be relatively inert though it was found that a higher concentration of copper was contained in
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The
Assessments Report determined nine areas requiring ongoing monitoring to determine localized strategies for remediation efforts in each location. These areas included the tailings storage facility, the Polley plug (a blockage area between the tailings effluent and Polley Lake), Polley Lake, upper
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measuring the water pressure on the dam had been located correctly, as the last readings, 2 August 2014, did not show any changes in the water pressure. In 2010, Mount Polley Mining Corporation's (MPMC) engineering firm reported a 10-metre (33 ft) crack in the earthen dam while working to raise
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Quintana Resources prospected the area in 1976, discovering numerous copper float boulders but let their claim to the property lapse in 1978. In 1980, E&B Exploration optioned the property from Highland Crow, a subsidiary of Teck. Through the early 1980s, the potential for gold mining on the site
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The Mount Polley ore deposit was discovered subsequent to an airborne magnetometer study completed by the Canadian government in 1964 which detected a significant reading for the surveyed map in the region of Polley Mountain. Investigating further, Karl Springer discovered an alkalic porphyry deposit
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of copper levels determined a level higher than provincial standards for the protection of invertebrates and plants but at far lower levels than the provincial standards for the protection of human health. Deep water analysis found copper to be at levels below the Provincial Water Quality Guideline.
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During a mine closure between 2002 and 2005, a new location called the "White pit" was discovered in the northeast region of the site. The White pit is located 1.5 km northeast of the Cariboo and Bell pits and revealed the richest deposit on the site (10 million tonnes of .9% copper). The White
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Care and maintenance at the Mount Polley mine included management of the water treatment facilities and the operation of site water management systems, including pumps and ditches. Mount Polley monitors the stability of the tailings storage facility on a regular basis. Mount Polley employed 15 staff
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During operation, Mount Polley runs four shifts. There is a day shift and a night shift each running twelve hours. Around 370 workers work these shifts seven days on and then get seven days off. About 50 staff include administrators, supervisors, warehouse operators, engineers, geologists, assayers,
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as part of that company's work toward implementing the Mount Polley remediation strategy. The produced report detailed current recreational and commercial uses of Polley Lake, Quesnel Lake, and Quesnel River and their environs including fisheries, swimming, boating, kayaking, canoeing, waterskiing,
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On 13 July 2015, Interior Health, the regional public health authority, declared all water restrictions lifted and determined water sourced from Polley Lake and Hazeltine Creek safe for consumption and recreation from a health perspective. A review of the water, sediment and fish toxicology samples
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The restoration of the shoreline of Hazeltine creek began to create a stable water flow and to begin the restoration of fish and associated wildlife habitats. This was preceded by floodplain grading and the determination of the physical land characteristics of the areas surrounding the shoreline. A
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prior to release into Quesnel lake. The water is monitored for turbidity at 15 second intervals and water quality is assessed at Quesnel lake as part of MPMC's Comprehensive Environmental Monitoring Plan. About 15,000 cubic meters of site water is discharged into Quesnel lake per day. This is below
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Clean up efforts have led to a reconstructed Hazeltine Creek, although the contaminated slurry that made its way into Polley Lake and Quesnel Lake remains in the waterways. A drinking water ban was lifted within weeks of the spill and regular water testing is being conducted by the B.C. government,
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regarding the release of environmental assessments and dam inspection reports after journalists found a report from 2010 and assessments from 1992 and 1997 in the public domain, the B.C. government has withheld subsequent reports. Following the event, some First Nations activists held protests and
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Early reactions to the tailings spill expressed grave concern, but no fines or charges against Imperial Metals have been assessed. On August 6, two days after the breach, the British Columbia Ministry of Environment issued a Pollution Abatement Order to Mount Polley Mining Corporation. The company
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In June 2015, the Post-Event Environmental Impact Assessments Report was published as part of the second phase of the strategy. The report was submitted by Golder Associates to the Mount Polley Mining Corporation to determine the physical, biological, and chemical implications 6–8 months after the
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The Mount Polley Mining Corporation has invested more than $ 70 million into remediation efforts since the dam breach in 2014. No government funding has been spent on the clean-up or repair work at the site. The restoration and remediation strategy was carried out in four stages: impact reduction,
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Other remediation and reconstruction efforts have included investigation on impacts to human health and safety and affected ecosystems while removing the tailings spill, reconstructing creek shorelines, installing fish habitats, and replanting trees and other local vegetation. Investigation by the
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On 18 August 2014, the British Columbia government ordered an independent engineering investigation into the pond breach and a third-party review of all 2014 dam safety inspections for every permitted mine's tailings pond in the province. The report found that the tailings dam collapsed because of
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The Remediation Plan was prepared by Golder Associates for the MPMC and was submitted to the British Columbia Ministry of Environment & Climate Change Strategy. This was the final requirement of the Pollution Abatement Order which was lifted on 12 September 2019. The Mount Polley Review Panel
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The HHRA report concluded that the risks were low to subsistence land users, recreational land users, loggers, and workers on site. Further, the human health risks associated with the tailings storage facility embankment breach were considered to be "very low". Groundwater did contain metals that
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inside the facility, to provide safe access to Hazeltine creek by reducing the elevation of Polley Lake behind the point of the blockage caused by the discharge of tailings effluent, and to stop inputs from the tailings storage facility. Specialists and environmental scientists and engineers were
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The long-term water management plan for the Mount Polley mine site has been approved by an independent statutory-decision maker from the Ministry of Environment and is expected to be fully in place by fall 2017 and will replace the short-term water management plan that has been in place since 30
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In the years after the tailing spill, the extent of the impact of the event has been largely determined. The British Columbia Ministry of Environment provides ongoing water monitoring of pH, conductivity, turbidity, total suspended solids, total dissolved solids, total organic carbon, hardness,
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elevated levels of arsenic and copper were not considered a threat to human health. These levels were similar to levels found in 2013 before the tailings breach and considered likely due to local geology. Sediment testing near the tailings spill revealed elevated concentrations of copper, iron,
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plan to mitigate ongoing erosion and sediment transport downstream, to control further flow from the tailings area, and to improve the quality of water flowing into Quesnel Lake. In the beginning of September 2014, a berm to prevent further spread of tailings was nearing completion and laid off
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Subsequently, the material is processed through a mill where the minerals get floated. In particular, the copper and gold minerals both float and are then concentrated. This process, called upgrading, creates a concentrated material that is approximately 23% copper. Gold is also captured in the
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Imperial Metals temporarily suspended operations of the Mount Polley mine in 2019 due to declining copper prices. Environmental remediation work continues at the site. The mine's closure affects 250 workers and is the second cessation of work due to global copper prices. The first such closure
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Water, sediment, and fish in Polley and Quesnel Lake are monitored by British Columbia government staff at the Ministry of Environment. Fish sampling in the months immediately proceeding the tailing spill revealed elevated levels of selenium that exceed guidelines for human consumption, though
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snowmobiling, and ice fishing. The report also noted the use of Quesnel Lake as a source of drinking water for nearby residences. As such the report investigated effect of the dam breach on human health, in particular subsistence land users, Quesnel Lake residents, and recreational land users.
887:. Yet, the government said tests in May 2014, prior to the tailings release, had shown elevated levels of the same elements. By 2016, Ministry of Environment testing determined zero exceedances of its guideline levels for contaminants for both aquatic life and drinking water in Quesnel Lake.
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The HHRA report found that soil, surface water, and the air did not contain contaminants of particular concern that were present or that exceeded contaminated site regulations. The sediment layer exceeded the regulatory standard for lead, while vegetation had copper and vanadium present, and
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A local state of emergency in nearby communities was initially declared in the interest of public safety with widespread water restrictions implemented and local equitable water distribution set up as a precautionary measure. Days later, some water use restrictions were removed for non-local
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A detailed site investigation was completed by Golder Associates in January 2016 as mandated by the Pollution Abatement Order issued by the British Columbia Ministry of Environment. This work was part of investigation and remediation work ongoing at the Mount Polley site. The detailed site
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Mount Polley Mining Corporation submitted its formal permit amendment application, which included the long-term water management plan and supporting Technical Assessment Report, in October 2016. The documents were subject to extensive public consultation, including First Nations and local
459:, a Mesozoic volcanic arc in the Canadian segment of the North American Cordillera. Precious metal mineralization in the two Mount Polley deposits occur the felsic stock occurred during the Jurassic-Triassic period. The copper-gold mineralization occurs within crackle and inclusion
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ecosystem was also considered to have little risk from copper as a limiting factor in the recovery of these organisms at the sediment layer. The ERA concluded that ecological risks associated with metals released by the dam breach and tailings spill are low.
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Number of exceedances for both drinking water and aquatic life guidelines from all BC Ministry of Environment sample events from August 4, 2014, to August 30, 2016, at Quesnel Lake, British Columbia. Data shows 0 exceedances of listed contaminants by end of
436:. Remediation work in the areas affected by the 2014 breach has been the focus of Mount Polley's staff from 2014 to 2019. While the mine's closure affected mining operations, it did not impact the ongoing environmental monitoring and remediation programs.
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The Mount Polley mine's tailings facility experienced a dam breach and tailings spill that began 4 August 2014. The four square kilometre tailings pond spilled an estimated 25 billion litres of contaminated materials into Polley Lake, Hazeltine Creek,
539:, and Cariboo River, a source of drinking water and major spawning grounds for sockeye salmon. Quesnel Lake is claimed to be the deepest fjord lake in the world, the third deepest lake in North America, and is the major tributary of the Fraser River.
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According to Mount Polley mine records filed with Environment Canada in 2013, there were “326 tonnes of nickel, over 400 tonnes of arsenic, 177 tonnes of lead and 18,400 tonnes of copper and its compounds placed in the tailings pond,” in 2012.
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post-breach environmental assessment, long-term health and environmental assessment, and implementation of work focused on remediation to prevent environmental and health impacts and to improve the condition of the areas affected by breach.
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In 1997, the Mount Polley mine opened with the Cariboo pit being the first site developed. The tailings storage facility was also constructed the same year. In 2010, the underground portion of the mine was built and operations expanded.
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levels above chronic exposure limits for aquatic life,although rainbow trout toxicity test results from water collected at Quesnel Lake near the mouth of Hazeltine Creek on August 5 and 6 showed water was not toxic to rainbow trout.
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During assaying, the value of copper and the value of gold in the ore is determined and a monetary value per tonne is placed on the material. When this value exceeds a particular threshold, workers start processing the material.
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and its compounds placed in the tailings pond ". At a community meeting on 5 August 2014, the president of Imperial Metals stated "we regularly perform toxicity tests and we know this water is not toxic to rainbow trout."
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were 53.8 million tonnes of ore grading 0.34% copper, 0.30 grams per tonne gold and 0.9 grams per tonne silver, equating to 400 million pounds of copper, 517,000 troy ounces of gold and 1.55 million troy ounces of silver.
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Over 6 kilometers of new fish spawning and rearing habitats were installed in upper to middle Hazeltine Creek. The successful spawning of Rainbow Trout was later observed in 2018 and 2019 in upper Hazeltine Creek.
550:", gradually settle out. The slurry of tailings and process water carried felled trees, mud and debris and wore away the banks of Hazeltine Creek which flows out of Polley Lake and continued into the nearby
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292:. In 2013, the mine produced an output of 38,501,165 pounds (17,463,835 kg) of copper, 45,823 ounces of gold, and 123,999 of silver. The mill commenced operations in 1997 and was closed and placed on
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Despite the levels of copper present due to presence in the tailings, the report determined it was unlikely to be released from the tailings and therefore adverse effects were deemed unlikely.
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where it has mining leases and operations on 2,007 hectares (20.07 km) and mineral claims on 18,106 hectares (181.06 km). Mineral concentrate is delivered by truck to the
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for the site was completed in 1991 and the first permits for developing the deposit were approved the same year. Financing from Imperial Metals however was not yet in place.
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By 8 August the four-square-kilometre (1.5 sq mi) sized tailings pond had been emptied of the majority of "process water" from which the crushed rock solids, or "
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Some tourism businesses in the adjacent surrounding areas remained open. Because the affected water system is salmon-bearing, there was a temporary closure of part of the
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exceeded drinking water standards including iron, manganese, arsenic, molybdenum, and sulfate. However, no wells that supply groundwater exist in the Hazeltine Corridor.
288:. It consists of two open-pit sites with an underground mining component and is owned and operated by the Mount Polley Mining Corporation, a wholly owned subsidiary of
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Mount Polley determines what qualifies as ore and what qualifies as waste using drilling and blasting. Ore is then sorted according to blast ball assays. High value
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the effluent compared to before the breach. Biological testing found copper contained within lake sediment and within the water was not toxic to aquatic life.
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Fishing on Polley Lake in 2019. Fish habitats were installed on middle and upper Hazeltine Creek during remediation efforts after the Mount Polley dam breach
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its construction on underlying earth containing a layer of glacial till, which had been unaccounted for by the company's original engineering contractor.
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In 2010, provincial government funding was cut for resource management. Preceding the dam breach, Mount Polley was inspected 2013, but not 2011 or 2012.
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set up blockades. Several local landowners and business operators affected by the spill have launched legal challenges to seek compensation for damages.
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Mount Polley Mining Company reopened the mine in July 2022. Mount Polley Mining Company estimates that the reopening of the mine created 300 local jobs.
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1885:"Hazeltine Creek and Quesnel River Water Quality for samples collected December 3 and December 10, 2015 compared to Drinking Water Guidelines"
1860:"Polley Lake Water Quality for samples collected September 15, 2014 to August 25, 2016 compared to Drinking Water and Aquatic Life Guidelines"
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843:, Minister of Energy and Mines, said "there is no evidence that the government's missed inspections were related to the failure of the dam ".
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Subsequent to the discovery of the white pit, after additional underground mining, another site was discovered and developed called "Martel".
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investigation was completed to produce a Human Health Risk Assessment (HHRA) report and an Ecological Risk Assessment for the affected site.
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1835:"Quesnel River Water Quality for samples collected August 4, 2014 to August 4, 2016 compared to Drinking Water and Aquatic Life Guidelines"
1810:"Quesnel Lake Water Quality for samples collected August 4, 2014 to August 30, 2016 compared to Drinking Water and Aquatic Life Guidelines"
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When operating, the Mount Polley mine moves 80,000–90,000 tonnes of material per day from the mine. This contains 20,000 tonnes of ore.
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Imperial Metals & Power Ltd was incorporated in British Columbia in December 1959. The company owns the Mount Polley open pit
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The scale of the initial disaster is tremendous: It is going to take a long time. This is the very, very beginnings of this,"
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1778:"Comparison of Continuous and Grab Sample Turbidity Data from the Quesnel River near Likely from August 2014 to May 2016"
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dam breach. The report detailed steps taken by the MPMC to stabilize the tailings storage facility by creating two rock
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Hazeltine creek, Hazeltine Canyon, lower Hazeltine creek, the mouth of Edney creek, Quesnel Lake, and Quesnel River.
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GEOLOGICAL - GEOCHEMICAL REPORT on the CAB 1-5 MINERAL CLAIMS Bootjack Lake Area 93 A 12/E Cariboo Mining Division
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Remediation of Hazeltine Creek at Mount Polley included shoreline restoration and establishment of fish habitats
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The Post-Event Environmental Impact Assessment Report update was completed in June 2015 by Golder Associates.
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the 29,000 cubic meters threshold allowed under the mining corporation's permit. The water at Quesnel lake,
479:, the mining of stream beds for minerals, was common practice in the area since the mid nineteenth century.
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The Mount Polley Mining Corporation (MPMC) treats mine site water with water treatment plant technology by
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Accessment Report on 2000 Percussion and Diamond Drilling at Mount Polley Mine Cariboo Mining Division
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554:. The spill emptied the tailings pond and caused Polley Lake to rise by 1.5 metres (4.9 ft).
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During operation, Mount Polley mine processes 20,000 tonnes of ore per day. The ore is sent for
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Remediation work to restore wetlands was a priority of the Mount Polley Remediation strategy
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678:, Polley lake, and Hazeltine creek are regularly monitored by the Ministry of Environment.
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In 2018, three engineers who worked on the tailings storage facility were charged by their
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1978:"UPDATE: Mount Polley Mine Tailings Pond Breach – Remaining Water Use Restrictions Lifted"
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the Mount Polley mine, the University of Northern British Columbia and local residents.
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2010:"Mount Polley Rehabilitation and Remediation Strategy - Human Health Risk Assessment"
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Ministry of Energy, Mines, and Petroleum Resources (Government of British Columbia),
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2014 ASSESSMENT REPORT on the PAT PROPERTY CARIBOO MINING DIVISION, BRITISH COLUMBIA
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2099:"Mount Polley mine breach: Elevated levels of chemical elements near tailings pond"
2035:"Mount Polley Rehabilitation and Remediation Strategy - Ecological Risk Assessment"
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915:. In 2019, Imperial Metals sold its 70% stake in the Red Chris copper/gold mine to
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Remediation work was conducted in tandem with investigative work done by Golder.
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from the Ministry of the Environment determined no known risks to human health.
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1605:"First Nation group launches protest to halt re-opening of Mount Polley mine"
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alkalinity, nutrients, general ions, total and dissolved metals at the site.
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1712:"Three engineers to face disciplinary hearings in Mount Polley dam collapse"
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COPPER-GOLD: Imperial reports underground drill results at Mount Polley mine
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for operations and hires and trains from the local communities of Big Lake,
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in 2019. The company owns 20,113 hectares (201.13 km) of property near
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1464:"Mount Polley mine spill: a hazard of Canada's industry-friendly attitude?"
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when it is sent overseas to buyers who then smelt and refine the material.
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1578:"Victoria breaking the law by not releasing mine reports: UVic law centre"
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1953:"Post-Event Environmental Impact Assessment Report - Key Findings Report"
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Mount Polley Update on Mineral Resource Estimate and Exploration Drilling
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1376:"Mount Polley mine tailings spill: Imperial Metals could face $ 1M fine"
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are the main copper-bearing minerals of value at the Mount Polley mine.
1529:"Water ban linked to Mount Polley mine tailings spill partially lifted"
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1496:"British Columbia mine breach 'a disaster' that will linger for years"
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Mount Polley ships material, concentrated by floating, by truck to
1066:"Mount Polley mine expected to open by fall 2021: Imperial Metals"
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pit's distance from the Cariboo pit necessitated new permitting.
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1739:"Remediation Plan Mount Polley Mine Perimeter Embankment Breach"
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ore is hauled to a crusher for processing at the on site plant.
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was explored due to the rising global price of the commodity.
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at the site while it operated in care and maintenance status.
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2077:"Mount Polley spill: Testing finds elevated selenium in fish"
1439:"Imperial Metals plans debenture issue in wake of dam breach"
2156:"Imperial Metals to Suspend Operations at Mount Polley Mine"
2120:"Imperial Metals acquires 100 per cent of Huckleberry Mines"
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1909:"How things were made right after the Mount Polley spill"
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aluminum, copper, and vanadium were present in the fish.
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The Human Health Risk Assessment (HHRA) was completed by
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for $ 804 million retaining a 30% interest in the mine.
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In August, MPMC submitted an interim erosion plan and a
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1632:"Mount Polley Spill taints Alaska-B.C. mine relations"
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Imperial Reports Second Quarter 2022 Financial Results
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Mining and Mineral Processing at the Mount Polley mine
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1685:"B.C. didn't inspect Mount Polley mine in 2010, 2011"
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The Mount Polley mineralization is classified as an
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846:According to an Imperial Metals summary filed with
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443:The company reopened mine operations in July 2022.
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1763:"Is Mount Polley Dumping Waste into Quesnel Lake?"
1656:"Mount Polley Updates-Tailings Breach Information"
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1354:"Mount Polley mine disaster: News and information"
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1170:"Major Mines & Projects - Mount Polley Mine"
1146:Mount Polley Mining Corporation (10 July 2020),
1123:Mount Polley Mining Corporation (10 July 2020),
1095:Mount Polley Mining Corporation (10 July 2020),
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16:Gold and copper mine in British Columbia, Canada
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455:-gold deposit. The deposits are located in the
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2136:. The Canadian Mining Journal. 16 August 2019
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1658:. Imperial Metals Corporation. Archived from
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1409:"Mount Polley tailings pond situation update"
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1015:Mount Polley Mining Corporation (June 2020),
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826:Government monitoring, impact, and inspection
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432:On 31 May 2019, Mount Polley mine was put on
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637:remediation team showed elevated levels of
624:with negligence or unprofessional conduct.
428:Care and maintenance shutdown and reopening
1865:. British Columbia Ministry of Environment
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1815:. British Columbia Ministry of Environment
1783:. British Columbia Ministry of Environment
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2122:. Prince George Daily News. 9 April 2017.
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1330:Canadian Mining Journal (1 March 2017),
1297:
1098:How does Mount Polley decide to process?
923:occurred in 2001 and lasted until 2005.
829:
803:
715:
685:
652:
525:
517:
373:
2004:
2002:
2000:
1998:
1360:
1304:J.W. (Bill) Morton (15 February 2015),
1201:
1118:
1116:
1114:
1031:
999:Imperial Reports 2013 Financial Results
681:
2197:
1924:"Reopen Mount Polley mine, union says"
1906:
1673:
1569:
1484:
1323:
1139:
2134:"Newcrest takes over at Red Chris JV"
2040:. Golder Associates. 15 December 2017
1522:
1520:
1403:
1401:
1399:
1397:
1395:
991:
989:
987:
617:were broken, which were later fixed.
1995:
1111:
608:The report investigated whether the
591:. Complaints were filed with B.C.'s
322:
2027:
1744:. Golder Associates Ltd. 2019-03-29
1576:Gordon Hoekstra (October 8, 2014).
1183:
657:Remediated wetlands at Mount Polley
627:
557:
311:As of January 2020, Mount Polley's
13:
1922:Sunny Dhillon (7 September 2014).
1709:
1683:Justine Hunter (14 October 2014).
1603:Kresnyak, Danny (April 29, 2015).
1517:
1494:Joel Connelly (24 November 2014).
1462:Peter Moskowitz (13 August 2014).
1392:
984:
850:in 2013, "there was 326 tonnes of
471:
393:
14:
2286:
2173:
1527:The Canadian Press (2014-08-09).
1190:Imperial Metals (8 August 2022).
996:Imperial Metals (31 March 2014),
514:Mount Polley tailings pond breach
406:
2225:Copper mines in British Columbia
2158:. My Cariboo Now. 8 January 2019
2015:. Golder Associates. 11 May 2017
1278:Vivian F. Park (15 March 2001),
600:Investigation and cause of spill
378:Workers at the Mount Polley mine
53:
46:
25:
2215:Environment of British Columbia
2148:
2126:
2112:
1983:. Interior Health. 13 July 2015
1876:
1851:
1826:
1769:
1755:
1731:
1703:
1624:
1596:
1430:
1346:
565:Environmental Impact Assessment
497:
2230:Gold mines in British Columbia
1437:Peter Koven (16 August 2014).
938:List of copper mines in Canada
649:Water management and treatment
330:Mount Polley does not require
1:
2275:Disasters in British Columbia
2097:Canadian Press (2014-08-29).
1046:, Imperial Metals, March 2021
978:
369:
180:38,501,165 pounds copper
2250:Cleaning and the environment
2180:Web site of the review panel
1064:BC Local News (6 May 2021).
943:List of gold mines in Canada
313:Proven and Probable Reserves
7:
2255:Natural resource management
2245:Economy of British Columbia
1883:Deborah Epps (2016-01-20).
1858:Deborah Epps (2016-10-19).
1833:Deborah Epps (2016-10-19).
1808:Deborah Epps (2016-12-08).
1776:Deborah Epps (2018-12-19).
1502:. Hearst Seattle Media, LLC
963:Highland Valley Copper mine
926:
589:Fisheries and Oceans Canada
434:care and maintenance status
349:
10:
2291:
2260:Mining and the environment
2240:Mining in British Columbia
1556:"Mt. Polley Mine incident"
1374:CBC News (6 August 2014),
1126:Who works at Mount Polley?
913:Kamloops, British Columbia
466:
446:
186:123,999 ounces silver
2270:Water pollution in Canada
2265:Environmental engineering
2205:Cariboo Regional District
2185:Mount Polley project site
1472:. Guardian News and Media
1211:MINFILE Mineral Inventory
909:Houston, British Columbia
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105:
95:
85:
75:
41:
36:
24:
2220:Geography of the Cariboo
1951:Lee Nikl (5 June 2015).
1710:CP (26 September 2018).
1558:. BC Government Newsroom
622:professional association
569:environmental monitoring
418:
127:52.513437°N 121.596309°W
2235:Silver mining in Canada
1958:. Golder Associates Ltd
1584:. Postmedia Network Inc
895:Imperial Metals history
816:
799:
785:
754:
711:
698:
453:alkalic porphyry copper
183:45,823 ounces gold
2063:"2014 Breach Overview"
1691:. Globe & Mail Inc
1040:Reserves and Resources
968:Canadian Malartic Mine
836:
809:
721:
691:
658:
531:
523:
386:, size reduction, and
379:
132:52.513437; -121.596309
2210:Environmental testing
862:and 18,400 tonnes of
854:, over 400 tonnes of
833:
807:
719:
689:
656:
529:
521:
483:there the same year.
377:
1926:. The Globe and Mail
1172:. Mining Data Online
933:List of copper mines
682:Remediation timeline
593:privacy commissioner
294:care and maintenance
338:and as far away as
332:high-skilled labour
256:Year of acquisition
123: /
21:
2065:. Imperial Metals.
1689:The Globe and Mail
1610:Vancouver Observer
848:Environment Canada
837:
810:
722:
692:
659:
645:and other metals.
532:
524:
380:
280:near the towns of
67:Location in Canada
19:
2079:. CBC. 2014-08-22
1911:. Resource Works.
1654:Imperial Metals.
1446:, syndicated via
1419:on 10 August 2014
771:Golder Associates
492:feasibility study
323:Mining operations
306:Port of Vancouver
266:Mount Polley mine
263:
262:
250:Mount Polley Mine
61:Mount Polley Mine
31:Mount Polley mine
20:Mount Polley mine
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858:, 177 tonnes of
705:sediment control
628:Clean-up efforts
558:Effects of spill
388:froth floatation
278:British Columbia
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2150:
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2092:
2081:. Retrieved
2071:
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2029:
2017:. Retrieved
1985:. Retrieved
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1960:. Retrieved
1928:. Retrieved
1917:
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1902:
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1878:
1867:. Retrieved
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1828:
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1785:. Retrieved
1771:
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1746:. Retrieved
1733:
1723:27 September
1721:. Retrieved
1715:
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1693:. Retrieved
1688:
1664:. Retrieved
1660:the original
1635:
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1608:
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1586:. Retrieved
1581:
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1536:. Retrieved
1511:
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1499:
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1469:The Guardian
1467:
1457:
1448:Star-Phoenix
1442:
1432:
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1417:the original
1412:
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1017:
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973:LaRonde mine
958:Coleman Mine
921:
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664:
660:
635:
631:
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607:
603:
582:
573:
561:
552:Quesnel Lake
545:
541:
537:Quesnel Lake
533:
522:24 July 2014
509:
505:
501:
498:Mine opening
489:
485:
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422:
410:
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397:
381:
360:Chalcopyrite
353:
329:
326:
318:
310:
298:Quesnel Lake
265:
264:
80:Quesnel Lake
1695:23 December
1588:23 December
1506:23 December
1476:26 November
901:copper mine
615:piezometers
610:piezometers
587:fishery by
302:Polley Lake
276:located in
274:copper mine
130: /
118:121°35′47″W
106:Coordinates
2199:Categories
2105:2014-09-14
2083:2014-09-14
1930:2014-09-14
1893:2020-04-22
1869:2020-04-22
1844:2020-04-22
1819:2020-04-22
1787:2020-04-22
1748:2020-04-22
1666:2014-09-14
1562:2014-08-16
1538:2014-08-10
1500:Seattle pi
1176:2020-08-07
979:References
879:, silver,
490:The first
370:Processing
207:Discovered
174:Production
143:Production
115:52°30′48″N
1197:(Report).
905:gold mine
873:manganese
413:Vancouver
2162:22 April
2140:22 April
1616:July 15,
1423:8 August
1385:8 August
1380:CBC News
1339:6 August
1316:6 August
1290:6 August
1264:6 August
1226:citation
1217:6 August
1155:6 August
1132:6 August
1104:6 August
1024:7 August
927:See also
917:Newcrest
885:vanadium
881:selenium
639:selenium
548:tailings
461:breccias
384:crushing
350:Minerals
336:Horsefly
148:Products
86:Province
76:Location
37:Location
2044:13 July
1987:13 July
1071:18 June
1050:19 July
877:arsenic
856:arsenic
793:benthic
643:arsenic
467:History
447:Geology
364:bornite
356:sulfide
340:Quesnel
246:Website
236:Company
202:History
96:Country
2019:11 May
1962:5 June
864:copper
852:nickel
671:Veolia
286:Likely
223:Closed
215:Opened
165:Silver
155:Copper
100:Canada
2038:(PDF)
2013:(PDF)
1981:(PDF)
1956:(PDF)
1888:(PDF)
1863:(PDF)
1838:(PDF)
1813:(PDF)
1781:(PDF)
1742:(PDF)
1311:(PDF)
1285:(PDF)
1258:(PDF)
1195:(PDF)
1044:(PDF)
835:2016.
727:berms
419:Staff
231:Owner
2164:2020
2142:2020
2046:2015
2021:2017
1989:2015
1964:2015
1725:2018
1697:2014
1618:2016
1590:2014
1508:2014
1478:2014
1425:2014
1387:2014
1341:2020
1318:2020
1292:2020
1266:2020
1232:link
1219:2020
1157:2020
1134:2020
1106:2020
1073:2021
1052:2021
1026:2020
903:and
883:and
860:lead
817:2019
800:2018
786:2017
755:2016
712:2015
699:2014
577:zinc
362:and
342:and
300:and
284:and
272:and
270:gold
259:1980
226:2019
218:1997
210:1969
197:2013
160:Gold
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