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A systematic water-quality study of the Fortymile River and many of its major tributaries in eastern Alaska was conducted in June of 1997 and 1998. Surface-water samples were collected for chemical analyses to establish regional baseline geochemistry values and to evaluate the possible environmental effects of suction-dredge placer gold mining and bulldozer-operated placer gold mining (commonly referred to as “cat mining”). In general, the water quality of the Fortymile River is very good, with low total dissolved solids and only two cases in which the concentration of any element exceeded primary or secondary drinking-water quality standards. In both cases, iron exceeded secondary drinking-water limits. At...
In the Arctic, permafrost extends up to 500 m below the ground surface, and it is generally just the top metre that thaws in summer. Lakes, rivers, and wetlands on the arctic landscape are normally not connected with groundwater in the same way that they are in temperate regions. When the surface is frozen in winter, only lakes deeper than 2 m and rivers with significant flow retain liquid water. Surface water is largely abundant in summer, when it serves as a breeding ground for fish, birds, and mammals. In winter, many mammals and birds are forced to migrate out of the Arctic. Fish must seek out lakes or rivers deep enough to provide good overwintering habitat. Humans in the Arctic rely on surface water in many...
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Mining landscapes are avowedly complex and dynamic cultural resources, representing an important part of the nation's cultural heritage. They reflect changes in technology, social organization, and the influence of outside events. Mining landscapes are also representative of the experiences of change over time. This representative experience is not well-represented in the typical approach to considering preservation of mining districts during the review of federal projects. This thesis takes a different approach, developing a classification system with a greater focus on the changes that occur, and tests this against a small-scale lode mining district in Southcentral Alaska. While the ability to factor in change...
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Several studies have documented the potential and existing environmental degradation due to all-terrain vehicle (ATV) use in sub-arctic terrain. Impacts include vegetation damage or destruction, changes in vegetation community composition and structure, substrate thermal change and permafrost thaw, and soil erosion and subsequent development of thermokarst features and terrain degradation. One of the most evident effects of prolonged ATV use in sub-arctic tundra is the development of extensive trail braiding. Trail braiding results from alternate trails that are created by users in order to avoid mud bogs and standing water (ponding) that develop on ATV trails which are underlain by ice ridge permafrost. One option...
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In the Yukon Territory and District of Mackenzie, coal-bearing strata, ranging in age from Mississippian to Oligocene, have been found in some 27 areas. In the Yukon, such rocks underlie 37,000 km2, while in the District of Mackenzie, 3000 km2 are believed to contain coal in the Brackett Basin alone, with additional potential in the Liard River, Godlin Lake and Great Bear Lake areas. The three most important basins are the Whitehorse Trough and Bonnet Plume Basin in the Yukon Territory and the Brackett Basin in the District of Mackenzie. In the Whitehorse Trough, coal exploration has been carried out at Mount Granger near Whitehorse and at Division Mountain, west of Braeburn. Coal mining has been actively carried...
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Pogo Mine Project: An Introduction The Project: The proposed Pogo Gold Mine would be located about 38 miles northeast of Delta Junction, Alaska, near the Goodpaster River (see figure 1). Teck-Pogo, Inc., the "applicant," plans to develop the mine on state-owned land. It would be an underground mine with a surface mill producing up to 500,000 ounces of gold each year. The applicant hopes to begin construction in 2002, and proposes to operate the mine 24 hours a day, 365 days a year, for about 12 years. This predicted mine-life is based on existing information; on-going exploration could increase the life of the mine. The project would employ up to 385 employees. Workers would be housed on site. An airstrip would...
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INTRODUCTION This summary of Alaska’s mineral industry activity for 2001 is made possible by information provided through phone interviews and replies to questionnaires mailed by the Alaska Division of Geological & Geophysical Surveys. The final report will be available later in the year after further compilation of information, particularly placer mining and industrial mineral data. This report is part of a cooperative venture between the Division of Geological & Geophysical Surveys (DGGS) and the Division of Mining, Land, & Water (DMLW) in the Department of Natural Resources (DNR) and the Division of Community & Business Development (DCBD) in the Department of Community & Economic Development (DCED). The estimates...
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A survey documenting how climate change is perceived, experienced, and responded to in the Canadian mining sector was administered to industry practitioners at the Prospectors & Developers Association of Canada annual meeting. Nine key findings from the survey are discussed: (1) The Canadian mining sector is sensitive to climate-related conditions. (2) Climate change is perceived to be having a negative impact on mining operations. (3) Companies are taking action to manage the current impacts. (4) Cost and uncertainty are commonly identified barriers to adapting to current climate change. (5) Future climate change is expected to have impacts for the industry. (6) Climate change projections are perceived as threats...
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The Koyukuk Mining District was one of several northern, turn of the century, gold rush regions. Miners focused their efforts in this region on the Middle Fork of the Koyukuk River and on several of its tributaries. Mining in the Koyukuk began in the 1880s and the first rush occurred in 1898. Continued mining throughout the early decades of the 1900s has resulted in an historic mining landscape consisting of structures, equipment, mining shafts, waste rock, trash scatters, and prospect pits. Modern work continues in the region alongside these historic resources. An archaeological survey was completed in 2012 as part of an Abandoned Mine Lands survey undergone with the Bureau of Land Management, Michigan Technological...
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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Risk assessment of natural gas transmission pipelines has been increasingly used to assist pipeline operators with the management of pipelines, and to extend the use of these assets, such as operating beyond the original design specifications and lifetime. BG Technology, in collaboration with an international group of gas companies, have developed, a knowledge based hazard and risk assessment package for gas transmission pipelines. PIPESAFE has already been widely used by the companies that supported its development, and allows managers to take informed decisions on what can be complex and emotive problems associated with pipeline operation and routing. This paper describes the methodology and mathematical modeling...
The Army Corps of Engineers is beginning an investigation of old petroleum spills and contamination which took place during the operation of the pipeline. The investigation for the presence of dioxin contamination along the route of the former fuel pipeline has been completed, with no residual herbicides or herbicide-related dioxin detected in any of the samples. Other forms of dioxins were below State cleanup levels at all sampling locations.
map background search result map search result map Technology, transportation, and scale in the Koyukuk Placer Mining District 1890s -- 1930s Deck wearing surfaces for the Yukon River Bridge The mining landscape from a diachronic perspective: Examining the Kenai Star mining district, Southcentral Alaska Regional baseline geochemistry and environmental effects of gold placer mining operations on the Fortymile River, eastern Alaska Perceptions of climate change risks in primary resource use industries: a survey of the Canadian mining sector The World Turned Upside Down: A History of Mining on Coal Creek and Woodchopper Creek, Yukon-Charley Rivers National Preserve, Alaska Coal resources of Northern Canada with emphasis on Whitehorse Trough, Bonnet Plume Basin and Brackett Basin ASSESSMENT REPORT for EXPLORATION on the ANNE 1 to 4 QUARTZ MINING CLAIMS, MARSH LAKE, YUKON TERRITORY between April, 2005 and April, 2006 All-Terrain Vehicle (ATV) Trail Mitigation Study: Comparison of Natural and Geosynthetic Materials for Surface Hardening within Wrangell-St Elias National Park and Preserve, Alaska POGO Gold Mine EIS/NEPA Project High-resolution records detect human-caused changes to the boreal forest wildfire regime in interior Alaska Wetland Reclamation for Placer Mining: Recommendations and Guidelines Background Document An assessment of mineral development adjacent to Kluane National Park and Reserve, Yukon Recent Developments in Renewable Energy in Remote Aboriginal Communities, Yukon, Canada POGO Gold Mine EIS/NEPA Project ASSESSMENT REPORT for EXPLORATION on the ANNE 1 to 4 QUARTZ MINING CLAIMS, MARSH LAKE, YUKON TERRITORY between April, 2005 and April, 2006 High-resolution records detect human-caused changes to the boreal forest wildfire regime in interior Alaska The World Turned Upside Down: A History of Mining on Coal Creek and Woodchopper Creek, Yukon-Charley Rivers National Preserve, Alaska An assessment of mineral development adjacent to Kluane National Park and Reserve, Yukon Regional baseline geochemistry and environmental effects of gold placer mining operations on the Fortymile River, eastern Alaska Technology, transportation, and scale in the Koyukuk Placer Mining District 1890s -- 1930s All-Terrain Vehicle (ATV) Trail Mitigation Study: Comparison of Natural and Geosynthetic Materials for Surface Hardening within Wrangell-St Elias National Park and Preserve, Alaska Wetland Reclamation for Placer Mining: Recommendations and Guidelines Background Document Recent Developments in Renewable Energy in Remote Aboriginal Communities, Yukon, Canada Coal resources of Northern Canada with emphasis on Whitehorse Trough, Bonnet Plume Basin and Brackett Basin Perceptions of climate change risks in primary resource use industries: a survey of the Canadian mining sector