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Pilot Scale Erosion Control Using Bioengineering Techniques at Gold Run Creek, 2005.
Disturbance of frozen ground, through placer mining activities, may lead to slope failure. A stockpile of frozen overburden has recently begun eroding from the formation of a runoff channel. A large cut, approximately 300 m long and up to 50 m deep has been created adjacent to Gold Run Creek, a heavily mined area southeast of Dawson City. This stockpiled overburden has been in place for several years and has revegetated with several species of mature willows (age dated to 15 years). Either due to heavy rainfall or climate change, melting has commenced in the stockpile resulting in the formation of a runoff channel. This has increased in size and slope failure continues to enlarge the cut. Laberge Environmental Services conducted a reconnaissance survey of the site in July 2003, to assess the site with the purpose of exploring ways of halting the slope failure and stabilizing the disturbed section of overburden. In the fall of 2005, several bioengineering structures were installed to assist in controlling the erosion. Retaining walls were installed on the side walls and the face of the cut, and a live willow flume was built to direct and reduce the velocity of the water entering the cut.
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Research of Low Permeability Cover Performance at the Arctic Gold and Silver Mine Site, Carcross, Yukon
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The Arctic Gold and Silver Mine Site located on Montana Mountain near Carcross, Yukon (the Site) operated during the late 1960's. After mining operation was ceased in 1969, there remained potential environmental issues with regards to the tailings that had accumulated at the Site during mine operation. A potential environmental issue associated with these tailings is the possibility that Acid Rock Drainage (ARD) could occur. To ensure that ARD reactions do not occur in the future at the site, the federal government (with assistance from consultants) developed a reclamation plan for the tailings at this site. A silty clay material was used to cover the tailings to prevent oxygen and water from entering and reacting with the iron-sulphides to produce ARD. EBA Engineering Consultants Ltd., the Carcross Tagish First Nation and partners, on behalf of Mining Environment Research Group and Indian and Northern Affairs Canada, conducted a study to evaluate the performance of the silty clay cover over a tailings impoundment at the Site between September 2000 and January 2001. Data-gathering equipment was installed at the Site. Three rounds of testing and monitoring at the site were completed to gather data regarding the thickness, oxygen concentrations, temperatures and moisture levels within the tailings and the cover. This report presents the conclusions and recommendations of the study:: - Observations show that the cover system was installed properly and according to the design - Preliminary data show that the cover is working to reduce the amount of moisture and oxygen entering the tailings - It would be valuable to collect more data at the Site to observe trends and see how well the cover systems will work over time in a northern climate.
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