A high-resolution radio echo sounder operating at a frequency of 840 MHz has been developed for sounding of small and medium-sized polar glaciers and ice caps. The sounder uses a compact, high-gain antenna which improves the system performance, suppresses valley wall echoes and simplifies operation from light aircraft. Successful field trials were carried out on the Rusty, Trapridge and Hazard Glaciers, Yukon Territory, Canada. Results of airborne surveys compare well with ice depths obtained from earlier ground-based soundings on the Rusty and Trapridge Glaciers. The maximum ice thickness encountered was 200 m on Hazard Glacier. Owing to the high operating frequency, random scattering from inhomogeneities within the ice is a major cause of signal degradation. For this reason the sounder cannot penetrate great thicknesses of temperate or debris-rich ice. Spatial averaging, an immediate result of operating from a moving platform, reduces the effects of back-scattered "clutter. " Results of ground-based tests on the Hazard Glacier yield a value for ftan 8 = 0.26 at -50C, in agreement with predicted values. The total received power and the echo details have both been found to be very sensitive to small (<<I0 cm) changes in antennae position. Large fluctuations in power, caused by roughness at or near the ice/air surface, prevented using single coverage data to detect birefringence in glacier ice. The results also indicate that the standard photographic records should be replaced by a recording medium capable of storing more precise and accessible data. A storage medium such as magnetic tape should not degrade the radar data, and would at the same time relieve a data processing burden. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

Transportation has always been of vital importance in the Yukon because of the small population, the harsh climate, and the remoteness from large markets. It has imported almost all of its industrial and consumer goods, supported by the export of a limited tonnage of high value mineral concentrates. Little growth has occurred in the past fifteen years in the value of mineral production, as it has remained fairly constantly at about $14 million. At present, though, the Yukon is in a stage of transition as many ore bodies are being brought into production. The effect on the Yukon economy will be substantial, as one estimate sees the dollar value of production increasing more than three-fold by 1975. The objective of this thesis is to determine the impact of this economic change on the total transport system. It is thus necessary to establish a measurement of the present level of freight services (the year chosen is 1964) and to establish a forecast of freight services for 1975. The measurement and forecast are then used to determine in what way the economic change may influence transport rates and services. The main sources of information for this paper were the various transportation and mining companies that are engaged in Yukon activities. Considerable use was made of the 1966 Stanford Research Institute study that concerned itself with the economics of paving the Alaska Highway. While many other sources were also consulted, they were generally of lesser importance. The growth rate of goods going north into the Yukon is forecast to be a moderate 5% per annum. The growth in the amount of ore concentrates going out of the Yukon should be considerably larger. For every ton moving north into the Yukon in 1964, 1.5 tons of freight moved out of the area, while by 1975 the ratio should increase to 6.5 tons for every northbound ton. As the present and planned mining developments are principally in the area north and northeast of Whitehorse where the White Pass and Yukon Route has the competitive advantage, most of the direct increase in freight traffic should benefit the White Pass and Yukon Route. Other transport companies should benefit also, but more due to indirect effects of the mining developments on freight traffic. The increase in the level of freight should make possible a higher utilization of present facilities and lower average costs. It appears that especially for the White Pass and Yukon Route the potential for reductions in freight rates should increase. / Business, Sauder School of / Graduate

The importance of integrating technology across the curriculum has been prominent in educational literature for the past decade. Numerous obstacles have been identified and documented surrounding the successful integration of technology in public schools. Access to hardware, appropriate software, professional training for educators, technical and financial support to sustain meaningful uses of technology in schools are the primary areas to be addressed when designing a comprehensive information technology implementation strategy for educational environments. The obstacles are clear, but many educational leaders have failed to develop a model which successfully addresses the challenge of integrating the use of technology as a tool for teaching and learning and as a means of constructing new knowledge for and by students. This paper will explore how technology facilitates learning through inquiry and how inquiry supports a constructivist/constructionist approach to teaching and learning for students and professional staff. This will lead to an examination of how inquiry and constructivism advance the integration of technology in education and how it provides a venue for developing communities of inquiry in schools. A framework for two initiatives developed for Yukon schools will be presented which address many of the challenges common to the successful integration of technology in public schools today. Both initiatives, the Computer Resource Teacher Model (CRTM) and Technology Learning Communities (TLC), promote integrative and constructive uses of technology through an inquiry-based approach to teaching and learning with computers.

This project examines arsenic in plants growing near closed or reclaimed gold mines located in the traditional territories of two Yukon First Nations. A total of 238 soil and plant samples (comprising 9 different species) were collected from Mt. Nansen, Arctic Gold and Silver, and Venus Mine tailing properties. At each property, samples were collected near the suspected point source of contamination, approximately 1 -3 km away, and from background sites. Species were chosen for their ethnobotanical significance to the Little Salmon/Carmacks and the Carcross/Tagish First Nations, based on interviews with Elders and other knowledgeable people. Total and inorganic arsenic concentrations were determined using ICP-MS and AAS instrumentation, and organic arsenic concentrations were calculated from the difference. Uptake of arsenic by plants was low compared to soil arsenic concentrations. In both plants and soil, the arsenic form was predominantly inorganic. Concentrations in berries at all three sites were low or undetectable, and are therefore considered safe to eat under Health Canada tolerable daily intake guidelines for inorganic arsenic. At Mt. Nansen, the lichen "caribou moss" (Cetraria/Cladina spp.), Bolete mushrooms (Leccinum spp.), and the medicinal shrubs willow (Salix spp.) and Labrador tea (Ledum groenlandicum/L. decumbens spp.) had high mean arsenic concentrations around point sources or at sites up to 1.5 km away. These localized high concentrations will not likely affect foraging animals, given their constant movement. However, Carmacks residents could avoid gathering all species with elevated arsenic around the Mt. Nansen mining property until reclamation is complete.

Valley glaciers often occur within complex dendritic systems where tributary glaciers contribute ice mass and blocking potential to the trunk glacier. Analysis of glacier inventories and maps in the regions of Svalbard, East Greenland, Yukon Territory and the Thompson Glacier system indicates that trunk - tributary intersections commonly occur at angles between 45° and 90°. An analogue material with flow properties similar to creep in pure ice has been used to simulate flow in a model valley glacier. The model and a series of blockages were constructed based on dimensions derived from the inventory and map analysis. The angled blockage indicates lower overall velocity rates and appears to have a funnelling rather than blocking affect on the analogue material. The perpendicular obstruction that blocked half the width of the model valley caused a piling up of analogue material prior to a release into the unobstructed side of the valley. / ix, 149 leaves : ill. ; 29 cm.

Archaeocyatha from the Lower Cambrian of Wolf Lake and Quiet Lake areas in the Yukon Territory are described and illustrated. The fossils occur in carbonate rocks and are well preserved. Much of the necessary structural detail of the fossils is clearly observed in thin-sections and on polished surfaces of the specimens. The collection contains twenty-three species, twelve of which are new species. The new species described are: Ajacicyathus yukonensis, Coscinocyathus multiporus. Coseinocyathus cassiariensis, Coscinocyathus inequivallug, Coscinocyathus serratus, Coscinocyathus veronicus, Coscinocyathus tubicornus, Carinacyathus perforatus, Pyenoidocyathus solidus, Loculicyathus elliptieus, Metacoscinus poolensis, and Claruscyathus ketzaensis. The genera Carinacyathus and Loculicyathus are reported for the first time in North America. The Yukon fauna is dominated by Coscinocyathidae and Pycnoidocyathidae, showing close relationship to faunae in the Cordilleran region of British Columbia. It also shows relationship to Siberian and Australian faunae. This fauna is very different from the archaeocyathid assemblages in Nevada and California, where the dominant forms are Ethmophyllidae and Ajacicyathiclae. Arehaeocyatha have been instrumental in determining the age of rocks underlying a large area of the Yukon Territory. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

This project examines arsenic in plants growing near closed or reclaimed gold mines located in the traditional territories of two Yukon First Nations. A total of 238 soil and plant samples (comprising 9 different species) were collected from Mt. Nansen, Arctic Gold and Silver, and Venus Mine tailing properties. At each property, samples were collected near the suspected point source of contamination, approximately 1 -3 km away, and from background sites. Species were chosen for their ethnobotanical significance to the Little Salmon/Carmacks and the Carcross/Tagish First Nations, based on interviews with Elders and other knowledgeable people. Total and inorganic arsenic concentrations were determined using ICP-MS and AAS instrumentation, and organic arsenic concentrations were calculated from the difference. Uptake of arsenic by plants was low compared to soil arsenic concentrations. In both plants and soil, the arsenic form was predominantly inorganic. Concentrations in berries at all three sites were low or undetectable, and are therefore considered safe to eat under Health Canada tolerable daily intake guidelines for inorganic arsenic. At Mt. Nansen, the lichen "caribou moss" (Cetraria/Cladina spp.), Bolete mushrooms (Leccinum spp.), and the medicinal shrubs willow (Salix spp.) and Labrador tea (Ledum groenlandicum/L. decumbens spp.) had high mean arsenic concentrations around point sources or at sites up to 1.5 km away. These localized high concentrations will not likely affect foraging animals, given their constant movement. However, Carmacks residents could avoid gathering all species with elevated arsenic around the Mt. Nansen mining property until reclamation is complete. / Arts, Faculty of / Geography, Department of / Graduate

The importance of integrating technology across the curriculum has been prominent in educational literature for the past decade. Numerous obstacles have been identified and documented surrounding the successful integration of technology in public schools. Access to hardware, appropriate software, professional training for educators, technical and financial support to sustain meaningful uses of technology in schools are the primary areas to be addressed when designing a comprehensive information technology implementation strategy for educational environments. The obstacles are clear, but many educational leaders have failed to develop a model which successfully addresses the challenge of integrating the use of technology as a tool for teaching and learning and as a means of constructing new knowledge for and by students. This paper will explore how technology facilitates learning through inquiry and how inquiry supports a constructivist/constructionist approach to teaching and learning for students and professional staff. This will lead to an examination of how inquiry and constructivism advance the integration of technology in education and how it provides a venue for developing communities of inquiry in schools. A framework for two initiatives developed for Yukon schools will be presented which address many of the challenges common to the successful integration of technology in public schools today. Both initiatives, the Computer Resource Teacher Model (CRTM) and Technology Learning Communities (TLC), promote integrative and constructive uses of technology through an inquiry-based approach to teaching and learning with computers. / Education, Faculty of / Curriculum and Pedagogy (EDCP), Department of / Graduate

No description available.

Brunhes, Matuyama, Kaena and Mammoth age basaltic lava (Selkirk Volcanics - TQS) as well as interbedded sediments were sampled in west-central Yukon Territory, Canada. Paleomagnetic sampling of basalt mapped as TQS along a 370 kilometre transect suggests that early eruptions of TQS occurred coevally over a significant distance to the north of Fort Selkirk. Basal basalt at Ne Ch'e Ddhawa pre-dates continental glaciation in Yukon and is older than the Fort Selkirk Vent (Lower Mushroom), previously thought to be the oldest eruptive vent at Fort Selkirk. The high confining pressures required to form pillow lava suggest subglacial eruptions at Mushroom section. An Early Pleistocene Fort Selkirk glaciation sequence (till and outwash) was reversely magnetized and assigned to the Late Matuyama chron between oxygen isotope stages 62 and 56 inclusive. A lateral moraine on Ne Ch'e Ddhawa was reversely magnetized and therefore assigned to one of the younger Pre-Reid glaciations. i / xi, 123 leaves : ill. (some col.) ; 29 cm.