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Anthropogenic and geogenic sources of arsenic (As) have been identified in mining-impacted soils from the Giant mine (1948-1999), NT and the North Brookfield mine (1886-1906), NS. Both used roasting to extract gold from the arsenopyrite ore, decomposing it to As-bearing iron oxides (roaster oxides or RO) containing As, and releasing As3+-bearing arsenic trioxide (As2O3). Arsenic trioxide is considered highly soluble with the dissolved As3+ species being more mobile and toxic than other oxidation states. Soil profiles from the Giant mine show elevated As and antimony (Sb) at the surface (As=140-3300ppm) and decreasing concentrations with depth (As=22-600ppm). Surface soils contain anthropogenically-derived As2O3 identified using synchrotron methods (µXRD, µXANES) and environmental SEM. The persistence of As2O3 is attributed to Sb in As2O3 grains, dry climate and high organics in the soils. Anthropogenically-derived RO of maghemite (containing both As3+ and As5+) and natural arsenopyrite were observed. Sequential selective extractions (SSE) from surface soils show between 20% and 75% of As extracted in the crystalline iron-oxide phase is attributed to As2O3 and RO, while at depth As is bound by organics in the weaker leaches. North Brookfield mine soils show lower total As (2ppm to 45ppm) except near the roaster (4300ppm). No As2O3 was identified, probably due to the smaller scale and age of the mine, lower organic content and the lack of Sb. As-bearing phases include RO of hematite (As5+), As-rich rims on titanium-oxides, and As associated with clays and goethite. Adjacent to the roaster, SSE show As was also in the amorphous iron-oxide phase, also shown by As in arsenopyrite weathering rims. There are many differences between the North Brookfield and Giant mine soils including roasting techniques which produced different RO mineralogy, the scale of mining, climate, soil type, and the presence of As2O3. Currently, the Giant property is not publically accessible but may become so in the future while the North Brookfield property is accessible. Understanding the form and distribution of As phases is critical because of the potential risk to human and ecosystem health associated with ingestion of soil particles and their control on the total dissolved As in surface and groundwater. / Thesis (Master, Geological Sciences & Geological Engineering) -- Queen's University, 2008-09-29 17:21:50.73

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This thesis examines the current relationship between Aboriginal and EuroCanadian Anglicans in the Northwest Territories and the Yukon as they seek to move beyond past hurts into a more positive future. After three field trips to Canada's North, visiting seven communities and interviewing seventy-nine individuals, complemented by archival research, I realized the dominant narrative based on a colonialism process linking residential schools, Christian Churches and federal government in a concerted effort to deliberately destroy Aboriginal peoples, cultures, and nations was not adequate to explain what happened in the North or the relationship that exists today. Two other narratives finally emerged from my research. The dominant narrative on its own represents a simplistic, one-dimensional caricature of Northern history and relationships. The second narrative reveals a more complex and nuanced history of relationships in Canada's North with missionaries and residential school officials sometimes operating out of their ethnocentric and colonialistic worldview to assimilate Aboriginal peoples to the dominant society and sometimes acting to preserve Aboriginal ways, including Aboriginal languages and cultures, and sometimes protesting and challenging colonialist policies geared to destroying Aboriginal self-sufficiency and seizing Aboriginal lands. The third narrative is more subtle but also reflects the most devastating process. It builds on what has already been acknowledged by so many: loss of culture. Instead of seeing culture as only tangible components and traditional ways of living, however, the third narrative focuses on a more deep-seated understanding of culture as the process informing how one organizes and understands the world in which one lives. Even when physical and sexual abuse did not occur, and even when traditional skills were affirmed, the cultural collisions that occurred in Anglican residential schools in Canada's North shattered children's understanding of reality itself. While the Anglican Church is moving beyond colonialism in many ways - affirming Aboriginal values and empowering Aboriginal people within the Anglican community, it nevertheless has yet to deal with the cultural divide that continues to be found in their congregations and continues to affect their relationship in Northern communities where Aboriginal and EuroCanadian people worship together yet remain separate.

Global and local climate patterns may affect barren-ground caribou (Rangifer tarandus groenlandicus) populations. I predicted global climate changes to be correlated with periods of population decline, and local changes to be more pronounced on the habitat of caribou with a declining population. In chapter 1, the Arctic Oscillation (AO), changes in normalized difference vegetation index and phenology were used as measures of global and local climate. In chapter 2 environmental variables and caribou presence points were used to build Maxent habitat models. There was no consistent correlation with the positive AO phase and periods of population decline, or phenology trends and the habitat of caribou with a declining population. Maxent models underestimated the amount of suitable habitat spatially and failed to model suitable habitat temporally. This thesis is the first to look at a range of density-independent variables over a long time period and model suitable habitat for multiple herds.

The Tibbitt-to-Contwoyto Winter Ice Road (TCWR) is the sole overland route servicing diamond mines north of Yellowknife, Northwest Territories (NWT), Canada. The road is 568 km long, 85% of which extends over frozen lakes. As such, its operational season is highly dependent upon the length of the winter season. This was exemplified in 2006, when an El Niño event caused an unusually short ice road season and resulted in a costly reduction of shipments to the mines. For future use and development of the TCWR, a comprehensive understanding of past regional climate variability is required. This study is an integral component of a larger-scale study designed to develop a comprehensive database of high-resolution paleoclimate data for the NWT, using a variety of proxies. As part of the larger study, freeze cores were taken from numerous lakes along the TCWR and sliced at 1-mm intervals using a custom-designed sledge microtome. Bulk 13C and 15N isotope analysis was completed at preliminary 1-cm intervals through the cores of two lakes on opposite sides of the tree line. Results from this analysis show clear trends with distinct transitions in both cores, whose closely-matched timing suggests regional-scale climate events. These results indicate that the Early Holocene was warm and dry, with a sudden shift to wetter conditions around 7200-6900 cal yr BP. Another shift to cooler conditions occurred at 4000 cal yr BP, and a final transition to even cooler temperatures occurred around 755-715 cal yr BP, coinciding with the Little Ice Age. Additionally, a modern lake survey was completed using surface sediments of numerous lakes throughout the Arctic and Subarctic. This survey verifies the strong influence of boreal forest vs. tundra conditions in affecting various environmental properties within lakes, including carbon and nitrogen isotopes. Lastly, time-series analysis was completed on two sections of Danny’s Lake core at high resolution (up to 2 mm), in order to determine short-term climate cycles. These results highlight specific climate frequencies which may be related to the Pacific Decadal Oscillation. These results offer insight to short-term climate phenomena in the Northwest Territories which will allow future climate modellers to make more accurate predictions of future climate and its impact on the ice road.

Crystallization temperatures (T) and oxygen fugacities (fO2) of kimberlite magma estimated from oxides included in olivine phenocrysts from eight kimberlite pipes in the central Slave Province, Canada, are compared to the degree and character of resorption observed in diamonds recovered from these kimberlites. The mechanism of diamond oxidation in kimberlite melts and the rate-controlling parameters for this reaction are explored in oxidation experiments. The T and maximum fO2 recorded by olivine - chromite pairs at an assumed pressure of 1 GPa are 970° -- 1070°C and 2.2 - 3.1 log units below the nickel - nickel oxide (NNO) buffer. This mineral assemblage crystallized from a magma with 1 1 to 28 mol% of liquid, 10 mol% of earlier-precipitated olivine phenocrysts and 62 to 79 molc7o of mantle xenocryst olivine. The T - fO2 values vary between kimberlites from Northwest and Southeast clusters within 150°C and one log unit, respectively, and form a trend of decreasing fO2 and increasing crystallization T in the southeast direction. This trend corresponds to substantial differences in the diamond populations. A detail description of morphological forms and surface resorption features for five diamond parcels (> 7000 stones) show an increase in diamond resorption with increase in kimberlite crystallization T and more extensive surface etching in more oxidized kimberlites. The surface etch features on diamonds are determined by the conditions in the kimberlite melt, whereas some of the volume resorption occurs in the mantle and its relationship with the melt conditions is obscure. The diamond grade is higher in kimberlites with lower fO2 confirming the effect of the melt conditions on diamond preservation. Diamond oxidation experiments at 1350°C to 1500°C and 1 GPa produced only surface graphitisation, and no diamond resorption in volatile undersaturated melts. In contrast, volatile oversaturated conditions produce resorption features seen in diamonds recovered from kimberlites, suggesting that the process of diamond resorption is its reaction with the fluid and not with the melt. Both CO2 and H2O oxidize diamonds at a similar rate, but produce very different surface features. Therefore, the surface features of natural diamonds may provide information on the H2O/CO2 ratio in the kimberlitic fluid. The morphologies of diamonds from this study imply high H2O/CO2. The scarcity of surface graphitisation and presence of highly resorbed diamonds in kimberlites suggest presence of free fluid phase in kimberlite magmas for the most of their history. The diamond oxidation is not affected by the physical properties of diamonds.

Ringed seal (Phoca hispida) is a major component and a major source of mercury (Hg) in the Inuit traditional diet. A high correlation between Hg and selenium (Se), as different forms of Hg-Se complex, has been reported in many species of marine mammals. The chemical form of the Hg-Se complex in ringed seals has never be characterised. In this study, Hg and Se concentrations in different seal tissues: liver, kidney, muscle and brain, were measured. The highest Hg and Se concentrations were found in the liver and a strong linear correlation was also observed between Hg and Se concentration in the seal liver. Extensive chromatographic and mass spectrometry techniques have been used to isolate and characterize the Hg and Se ligands in seal liver. Extraction of Hg and Se showed that Hg and Se were bound to ligands within the cell membranes of ringed seal liver. The Hg/Se binding protein has a MW range of about 65 kDa and Hg and Se had a 1:1 molecular ratio. The Hg/Se binding protein may contain 3 major polypeptides with MW of 6510.8, 14305.1 and 14353.1 Da. The toxicology of this Hg/Se binding protein will be studied using an animal feeding experiment.

The Great Bear magmatic zone, Northwest Territories, hosts numerous giant quartz veins and stockwork zones. These zones can be up to 100m wide and up to 10km long, with two or more generations of quartz. A few of the giant quartz vein zones host base-metal uranium mineralization, and some are proximal to mineralization, although most are barren. Cathodoluminescence imaging shows the quartz veins have complex growth zones and a trace element study suggests that these zones are the result of Al and Li substitution in the quartz lattice. Oxygen isotope (18Oqtz) values of quartz generally fall between +8 to +14.6 (VSMOW). Fluid inclusion homogenization temperatures range from 100 to 375C, and the fluids have variable salinities. The fluids that created the giant quartz veins are epithermal in nature with a meteoric water brine signature, and formed as a result of multiple fluid pulses and re-fracturing events.

M.A. / The Rural Development strategy is very important to the dominantly rural Molopo District of the North-West Province of South Africa. However, the majority of the case studies in Africa seem to suggest that the strategy is always 'top-down' (void of people's participation). The failure of this strategy to alleviate rural poverty is mostly predicated on this nature. This study examines the prevalence of people's participation in all the stages of the rural development projects, in four rural areas in the Molopo District. The study was done through literature review and testing the theory (by use of questionnaires and interviews) on people's participation in the four rural areas. The findings reveal a dire need for people's participation in the rural development projects. One may argue that though people's participation renders projects more effective and successful, the stages at which involvement can occur are varied. In the final analysis, the case studies of two most successful and two least successful projects are discussed. In conclusion, the study makes recommendations to the rural development agencies in the North-West to practise meaningful and realistic people's participation in their projects.