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Ekati Diamond Mine
The Ekati Diamond Mine ("Ekati") is Canada's first surface and underground diamond mine. It is located north-east of Yellowknife, Northwest Territories, and about south of the Arctic Circle, near Lac de Gras. Until 2014 Ekati was a joint venture between Dominion Diamond Mines (80%), and the two geologists who discovered kimberlite pipes north of Lac de Gras, Chuck Fipke and Stewart Blusson each holding a 10% stake in the mine, until Fipke sold his share to Dominion. History The first volcanic pipe found in the Lac de Gras region was the Point Lake kimberlite, discovered by Chuck Fipke and Stewart Blusson who had been prospecting in the region for almost ten years, having found kimberlite indicator minerals as early as 1985. The Point Lake kimberlite was determined to be uneconomic, but its discovery precipitated one of largest staking rushes in mining history, covering most of the area between Yellowknife and the Arctic coast. There are 156 known kimberlite pipes within the Ek ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lac De Gras
Lac de Gras is a lake approximately north east of Yellowknife, in the Northwest Territories of Canada. Lac de Gras was the centre of the diamond rush of the 1990s. There are two working, and one closed, diamond mines in the area, Diavik Diamond Mine, Ekati Diamond Mine, and the care and maintenance Snap Lake Diamond Mine. It was called Ekati by aboriginal peoples. The lake is ultraoligotrophic but supports a slow-growing but stable population of some eight species of cold-water fishes, including round whitefish, cisco, and lake trout. Lake trout dominate the lake, both numerically and in terms of biomass. Other native fish species include common whitefish, Arctic grayling, burbot, longnose sucker, and slimy sculpin. Diavik Diamond Mines is conducting open-pit mining of kimberlite pipes using explosives near the lake. Lac de Gras' surface area is ; the historical surface area was , about 196.4 ha larger than today. The subbasin area is with the number of lakes smaller than ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lac De Gras Kimberlite Field
The Lac de Gras kimberlite field is a group of Late Cretaceous to Eocene age diatremes in the Northwest Territories, Canada. The Eocene (ca. 55-50 Ma) age diatremes of the Lac de Gras kimberlite field support two world-class diamond mines called Ekati and Diavik. Ekati, Canada's first diamond mine, has produced of diamonds out of six open pits between 1998 and 2008, while Diavik to the southeast has produced of diamonds since its foundation in 2003. See also * List of volcanoes in Canada *Volcanism of Canada *Volcanism of Northern Canada Volcanism of Northern Canada has produced hundreds of volcanic areas and extensive lava formations across Northern Canada. The region's different volcano and lava types originate from different tectonic settings and types of volcanic eruptions, ra ... References Diatremes of the Northwest Territories Geology of the Northwest Territories Cretaceous volcanoes Paleocene volcanoes Eocene volcanoes Volcanic fields of Canada {{N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanism Of Canada
Volcanic activity is a major part of the geology of Canada and is characterized by many types of volcanic landform, including lava flows, volcanic plateaus, lava domes, cinder cones, stratovolcanoes, shield volcanoes, submarine volcanoes, calderas, diatremes, and maars, along with less common volcanic forms such as tuyas and subglacial mounds. Though Canada's volcanic history dates back to the Precambrian eon, at least 3.11 billion years ago, when its part of the North American continent began to form, volcanism continues to occur in Western and Northern Canada in modern times, where it forms part of an encircling chain of volcanoes and frequent earthquakes around the Pacific Ocean called the Pacific Ring of Fire. Because volcanoes in Western and Northern Canada are in relatively remote and sparsely populated areas and their activity is less frequent than with other volcanoes around the Pacific Ocean, Canada is commonly thought to occupy a gap in the Ring of Fire between the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hugo Dummett
Hugo T. Dummett (1940–2002) was a South African mineral-exploration geologist who is best known for his role in the discovery of the Ekati Diamond Mine in the Barren Lands of Canada's Northwest Territories. Dummett has been described as "the brains, the ideas and the energy" behind the discovery of Ekati, which led to the creation of a new Canadian diamond-mining industry. Career Dummett earned his BSc degree at the University of the Witwatersrand in 1964, and moved to Canada in 1965 and attended Queen's university at Kingston, where he was a star rugby player playing fullback. In 1970, he entered the University of Queensland for graduate work. In 1977, Dummett signed on with Superior Oil to prospect for diamonds in North America, just as the science of using indicator minerals -- pyrope garnets, chrome diopside and chromite—for diamond exploration was being worked out. Superior formed a joint venture with Falconbridge Limited, and the joint venture hired geologist Charles Fip ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metasequoia
''Metasequoia'', or dawn redwoods, is a genus of fast-growing deciduous trees, one of three species of pinophyta, conifers known as redwoods. The living species ''Metasequoia glyptostroboides'' is native to Lichuan, Hubei, Lichuan county in Hubei province, China. Although the shortest of the Sequoioideae, redwoods, it grows to at least in height. Local villagers refer to the original tree from which most others derive as ''Shuǐshān'' (水杉）, or "water fir", which is part of a local shrine. Since its rediscovery in 1944, the dawn redwood has become a popular ornamental, with examples found in various parks in a variety of countries. Together with ''Sequoia sempervirens'' (coast redwood) and ''Sequoiadendron giganteum'' (giant sequoia) of California, ''Metasequoia'' is classified in the Cupressaceae subfamily Sequoioideae. ''M. glyptostroboides'' is the only living species in its genus, but three fossil species are known. Sequoioideae and several other genera have been ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heat Pipe
A heat pipe is a heat-transfer device that employs phase transition to transfer heat between two solid interfaces. At the hot interface of a heat pipe, a volatile liquid in contact with a thermally conductive solid surface turns into a vapor by absorbing heat from that surface. The vapor then travels along the heat pipe to the cold interface and condenses back into a liquid, releasing the latent heat. The liquid then returns to the hot interface through either capillary action, centrifugal force, or gravity and the cycle repeats. Due to the very high heat transfer coefficients for boiling and condensation, heat pipes are highly effective thermal conductors. The effective thermal conductivity varies with heat pipe length, and can approach for long heat pipes, in comparison with approximately for copper. Structure, design and construction A typical heat pipe consists of a sealed pipe or tube made of a material that is compatible with the working fluid such as copper ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Permafrost
Permafrost is ground that continuously remains below 0 °C (32 °F) for two or more years, located on land or under the ocean. Most common in the Northern Hemisphere, around 15% of the Northern Hemisphere or 11% of the global surface is underlain by permafrost, with the total area of around 18 million km2. This includes substantial areas of Alaska, Greenland, Canada and Siberia. It can also be located on mountaintops in the Southern Hemisphere and beneath ice-free areas in the Antarctic. Permafrost does not have to be the first layer that is on the ground. It can be from an inch to several miles deep under the Earth's surface. It frequently occurs in ground ice, but it can also be present in non-porous bedrock. Permafrost is formed from ice holding various types of soil, sand, and rock in combination. Permafrost contains large amounts of biomass and decomposed biomass that has been stored as methane and carbon dioxide, making tundra soil a carbon sink. As global war ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heat Pipe
A heat pipe is a heat-transfer device that employs phase transition to transfer heat between two solid interfaces. At the hot interface of a heat pipe, a volatile liquid in contact with a thermally conductive solid surface turns into a vapor by absorbing heat from that surface. The vapor then travels along the heat pipe to the cold interface and condenses back into a liquid, releasing the latent heat. The liquid then returns to the hot interface through either capillary action, centrifugal force, or gravity and the cycle repeats. Due to the very high heat transfer coefficients for boiling and condensation, heat pipes are highly effective thermal conductors. The effective thermal conductivity varies with heat pipe length, and can approach for long heat pipes, in comparison with approximately for copper. Structure, design and construction A typical heat pipe consists of a sealed pipe or tube made of a material that is compatible with the working fluid such as copper ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ekati Airport
Ekati Airport is located at the Ekati Diamond Mine, Northwest Territories, Canada and is operated by Arctic Canadian Diamond Company Prior permission is required to land except in the case of an emergency. It is a busy aerodrome with blasting in the area and barren-ground caribou The barren-ground caribou (''Rangifer tarandus groenlandicus''; but subject to a recent taxonomic revision. See Reindeer: Taxomony.) is a subspecies of the reindeer (or the caribou in North America) that is found in the Canadian territories of Nu ... may be found on the runway. References External links Registered aerodromes in the North Slave Region {{NorthwestTerritories-airport-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fly-in Fly-out
Fly-in fly-out is a method of employing people in remote areas by flying them temporarily to the work site instead of relocating employees and their families permanently. It is often abbreviated to FIFO when referring to employment status. This is common in large mining regions in Australia and Canada. Similar to the fly-in fly-out roster is the DIDO (drive-in drive-out) roster, which has essentially the same benefits and drawbacks. Overview Rather than relocating employees and their families to a town near the work site, the employees are flown to the work site, where they work for a number of days, and are then flown back to their hometowns for a number of days of rest. Fly-in fly-out is very commonly used in the mining and oil and gas drilling industries, as mines and wells are often in areas far from towns. Generally, such sites use portable buildings since there is no long-term commitment to that location (e.g., the mine will close once the minerals have been extracted, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Underground Mining (hard Rock)
Underground hard-rock mining refers to various underground mining techniques used to excavate "hard" minerals, usually those containing metals, such as ore containing gold, silver, iron, copper, zinc, nickel, tin, and lead. It also involves the same techniques used to excavate ores of gems, such as diamonds and rubies. Soft-rock mining refers to the excavation of softer minerals, such as salt, coal, and oil sands. Mine access Underground access Accessing underground ore can be achieved via a decline (ramp), inclined vertical shaft or adit. *Declines can be a spiral tunnel which circles either the flank of the deposit or circles around the deposit. The decline begins with a box cut, which is the portal to the surface. Depending on the amount of overburden and quality of bedrock, a galvanized steel culvert may be required for safety purposes. They may also be started into the wall of an open cut mine. *Shafts are vertical excavations sunk adjacent to an ore body. Shafts are s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High Grading
In forestry, fishing and mining, high grading refers to the selective harvesting of goods to keep only the most valuable items. The term is frequently associated with fraud, especially in mining. Forestry In forestry, high grading, also sometimes referred to as selective logging, is a selective type of timber harvesting that removes the highest grade of timber (i.e. the most merchantable stems) in an area of forest. It is sometimes described by the phrase “''cut the best and leave the rest''”, and should not be confused with selection cutting. Over time, high grading gives rise to forest stands containing stems of lower timber quality. The reduced income from timber can make it harder to fund good silvicultural practices, thereby impacting the economy of non-timber forest products and other activities such as hunting, wildlife watching or hiking. The practice also has an ecological cost, with a direct impact in terms of biodiversity, genetic diversity and species mix. Finally ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
