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This study focussed on the development and evaluation of bioassessment methods for wadeable streams of the Yukon River basin within Yukon Territory. There were three components to this study. The first was the detailed development, evaluation and comparison of Reference Condition Approach (RCA) bioassessments using fish and benthic macroinvertebrates (BMI) from the same stream sites. Second, methods were developed for examining the relationships between stream biota and a gradient of placer gold mining. Finally, the statistical power of bioassessments developed for the Yukon River basin was evaluated by applying the bioassessments to stream site data subjected to simulated impacts. Comparison of RCA bioassessments...
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The Alaska Highway crosses numerous terrain units underlined by warm and ice-rich discontinuous permafrost highly susceptible to thermal degradation. For years, this infrastructure, which is essential to transportation in northwestern Canada and Alaska, has been showing signs of road damage induced by permafrost degradation. In 2008, Yukon Highways and Public Works, and its international collaborators, implemented a road experimental site near Beaver Creek (Yukon) to test mitigation techniques aiming to control permafrost degradation. Permafrost investigations were done accordingly to a geosystem approach based on the hypothesis that permafrost has a distinctive sensitivity to climate and terrain conditions at a...
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Managing conflicts between bears and humans is vital for human safety and for the conservation of bears. This study investigated black bear ( Ursus americanus ) and grizzly bear (Ursus arctos ) interactions with humans in 18 major communities of the Yukon Territory. I used an information theoretic approach to generate predictive models of the relative potential of bear-human interaction for the 9 conservation officer management regions in the Yukon Territory. I independently modeled interactions for each species according to 2 distinct bear foraging seasons: hypophagia and hyperphagia. Predictive models for both foraging seasons suggest a strong correlation between anthropogenic linear features and black and grizzly...
A 4-year study was conducted to evaluate the consequences of human trampling on dryas and tussock tundra plant communities. Treatments of 25, 75, 200 and 500 trampling passes were applied in 0·75 m2vegetation plots at a time of approximately peak seasonal biomass. Immediately after and 1 and 4 years after trampling, plots were evaluated on the basis of plant species cover, percent bare ground, vegetation height, and soil penetration resistance. One year after trampling, soils were collected for nitrogen analysis in highly disturbed and control plots. Immediately after trampling, 500 trampling passes resulted in approximately 50% cover loss in the dryas tundra and 70% cover loss in tussock tundra, but both communities...
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In order to properly manage this vast wilderness, the park completed a major amendment to its general management plan in 2006, a comprehensive backcountry management plan and environmental impact statement (BCMP). The backcountry management plan is the result of a public process that took eight years and included specific management goals for Denali’s variety of backcountry lands: designated wilderness, suitable wilderness, national preserve, national park, and other undeveloped park lands. The plan created management zones to accommodate a range of backcountry users accessing the park in a variety of ways, such as day hikers, backpackers, mountain climbers, snow machiners, and hunters. Soundscape is a critical...
"Boreal ecosystems contain one-third of the world's forests and stored carbon, but these regions are under increasing threat from both natural and anthropogenic disturbances. Written by leaders from the forefront of private, public and academic sectors Reclamation and restoration of boreal ecosystems emphasizes a broad, conceptual approach to the specific application of empirical research into development planning, restoration and modelling of these ecosystems, the importance of which is highlighted at a time of global climate change as they act as carbon sinks. There is a focus on the reclamation of exploited ecosystems from a holistic standpoint, ranging from environmental and edaphic variables to the restoration...
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The Orange Hill property ("Property") is a parcel of eighteen patented mineral claims and one patented mill site encompassing 363.23 acres located at the toe of Nabesna Glacier at a distance of approximately 12 miles by trail from the end of the Nabesna Road. The distinctive orange color of the hill stems from the weathering of a large body of disseminated copper, molybdenum, silver and gold mineralization that forms the bedrock of the property. The Property is owned by Northwest Explorations Joint Venture ("Venture") organized for the purpose of conducting mineral exploration in Alaska. At the time of organization, AJV Corporation contributed to the Venture the Orange Hill Property, consisting of eighteen patented...
In order to properly manage this vast wilderness, the park completed a major amendment to its general management plan in 2006, a comprehensive backcountry management plan and environmental impact statement (BCMP). The backcountry management plan is the result of a public process that took eight years and included specific management goals for Denali’s variety of backcountry lands: designated wilderness, suitable wilderness, national preserve, national park, and other undeveloped park lands. The plan created management zones to accommodate a range of backcountry users accessing the park in a variety of ways, such as day hikers, backpackers, mountain climbers, snow machiners, and hunters. Soundscape is a critical...
Patterns of compositional zoning are documented in nine grains of magnesiochromite–chromite (Mgc–Chr), 0.3–0.4 mm in size, subhedral or subrounded, recovered from six placer deposits in British Columbia. Their core zones correspond to Mgc or magnesian Chr, mantled by zones of Chr. A rim of Zn-rich chromite (9.1% ZnO) occurs in one grain. In most of these grains, Fe2+ increases and Mg decreases toward the margin. In contrast, an “anomalous” rim, slightly richer in Mg than the core, is developed in one grain, in which an increase in Mg (=2% MgO) is accompanied by a corresponding increase in Fe3+, Al, minor Ti, and by a decrease in Fe2+ and Cr. In the other zoned grains, contrasting trends are documented for Fe3+ and...
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"The Resource Access Roads Framework approved in February 2013 outlines the goals and principles that guide decisions around the development and management of resource access roads. This framework calls for a “successional permit” to regulate resource access roads in areas such as off mineral claims and on oil production leases beyond the normal three-year land use permit. It is time to update the regulations to include permitting specifically for resource access roads based on the priorities set in the framework document and Yukon’s knowledge and experience of regulating resource roads in the north. This new regulation under the Territorial Lands (Yukon) Act will provide up-to-date land management tools and...
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We used the Muskwa-Kechika Management Area in northeast British Columbia, Canada as a case study to determine potential conflicts between future resource development and high-value habitats of large mammals in an undeveloped boreal landscape. More than 50 % of high-value habitats for caribou, moose, elk, wolves and grizzly bears were located in Special Resource Management Zones, where natural resource developments could occur. We developed geographic information system (GIS) layers of potential forest resources, oil and gas, minerals, wind power, all resources combined, and roads; and quantified the proportions of high-value habitats overlapping these potentials. Greater proportions of high-value habitats across...
map background search result map search result map Climate change and mining in Canada Resource access road regulation: discussion paper Preliminary overview heritage impact assessment of the Whitehorse Copper Development area: stage I - final report Impact of epidermal leaf mining by the aspen leaf miner ( Phyllocnistis populiella) on the growth, physiology, and leaf longevity of quaking aspen Regional baseline geochemistry and environmental effects of gold placer mining operations on the Fortymile River, eastern Alaska Assessing bear-human conflicts in the Yukon Territory Evaluation of fish and benthic invertebrate bioassessments and the effects of placer mining on Yukon River Basin streams The History of the Orange Hill, Alaska Copper-Molybdenum Property Under Northwest Explorations Joint Venture Ownership -- (1970 to 2005) Soundscapes monitoring and an overflight advisory group: Informing real-time management decisions at Denali A geosystems approach to permafrost investigations for engineering applications, an example from a road stabilization experiment, Beaver Creek, Yukon, Canada Experimentation of Mitigation Techniques to Reduce the Effects of Permafrost Degradation on Transportation Infrastructures at Beaver Creek Experimental Road Site, Alaska Highway, Yukon How important is biomass burning in Canada to mercury contamination? Potential conflict between future development of natural resources and high-value wildlife habitats in boreal landscapes Experimentation of Mitigation Techniques to Reduce the Effects of Permafrost Degradation on Transportation Infrastructures at Beaver Creek Experimental Road Site, Alaska Highway, Yukon The History of the Orange Hill, Alaska Copper-Molybdenum Property Under Northwest Explorations Joint Venture Ownership -- (1970 to 2005) Preliminary overview heritage impact assessment of the Whitehorse Copper Development area: stage I - final report Impact of epidermal leaf mining by the aspen leaf miner ( Phyllocnistis populiella) on the growth, physiology, and leaf longevity of quaking aspen A geosystems approach to permafrost investigations for engineering applications, an example from a road stabilization experiment, Beaver Creek, Yukon, Canada Regional baseline geochemistry and environmental effects of gold placer mining operations on the Fortymile River, eastern Alaska Soundscapes monitoring and an overflight advisory group: Informing real-time management decisions at Denali Potential conflict between future development of natural resources and high-value wildlife habitats in boreal landscapes Resource access road regulation: discussion paper Assessing bear-human conflicts in the Yukon Territory Evaluation of fish and benthic invertebrate bioassessments and the effects of placer mining on Yukon River Basin streams How important is biomass burning in Canada to mercury contamination? Climate change and mining in Canada