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Mount Read Volcanics
The Mount Read Volcanics is a Cambrian volcanic belt that exists in Western Tasmania. It is a complex belt due to folding, faulting and a range of tectonic events. It is a productive mineralised belt that has profitable copper-silver and gold production of Mount Lyell, Rosebery, and Henty Gold Mine ; and numerous smaller sites of prospective mineralisation along the West Coast Range. See also *Geology of Tasmania The geology of Tasmania is complex, with the world's biggest exposure of diabase, or dolerite. The rock record contains representatives of each period of the Neoproterozoic, Paleozoic, Mesozoic and Cenozoic eras. It is one of the few southern h ... References * * * * Large, R.R. (editor) and convenor: P.L.F. Collins (1986) ''The Mount Read volcanics and associated ore deposits : a symposium, Burnie, November 1986''. Hobart : Geological Society of Australia, Tasmanian Division. * * * * Geologic formations of Australia Western Tasmania Geology of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambrian
The Cambrian Period ( ; sometimes symbolized C with bar, Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million years ago (mya) to the beginning of the Ordovician Period mya. Its subdivisions, and its base, are somewhat in flux. The period was established as "Cambrian series" by Adam Sedgwick, who named it after Cambria, the Latin name for 'Cymru' (Wales), where Britain's Cambrian rocks are best exposed. Sedgwick identified the layer as part of his task, along with Roderick Murchison, to subdivide the large "Transition Series", although the two geologists disagreed for a while on the appropriate categorization. The Cambrian is unique in its unusually high proportion of sedimentary deposits, sites of exceptional preservation where "soft" parts of organisms are preserved as well as their more resistant shells. As a result, our understanding of the Ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Belt
A volcanic belt is a large volcanically active region. Other terms are used for smaller areas of activity, such as volcanic fields. Volcanic belts are found above zones of unusually high temperature () where magma is created by partial melting of solid material in the Earth's crust and upper mantle. These areas usually form along tectonic plate boundaries at depths of . For example, volcanoes in Mexico and western North America are mostly in volcanic belts, such as the Trans-Mexican Volcanic Belt that extends from west to east across central-southern Mexico and the Northern Cordilleran Volcanic Province in western Canada. The deeply deformed and eroded remnants of ancient volcanic belts are found in volcanically inactive regions such as the Canadian Shield. It contains over 150 volcanic belts (now deformed and eroded down to nearly flat plains) that range from 600 to 1,200 million years old. These are zones of variably metamorphosed mafic to ultramafic volcanic sequences wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
West Coast, Tasmania
The West Coast of Tasmania is mainly isolated rough country, associated with wilderness, mining and tourism. It served as the location of an early convict settlement in the early history of Van Diemen's Land, and contrasts sharply with the more developed and populous northern and eastern parts of the island state. Climate The west coast has a much cooler and wetter climate when compared to the east coast. Frequent low pressure systems hit the west coast causing heavy rain, snow, and ice. The West Coast Range blocks these systems from impacting the east, therefore making the West Coast a rain catchment with some areas receiving over of rain a year. In winter temperatures at sea level hover around , and when not raining, morning frost is common. The temperatures are much lower inland from the coast with maximums in winter often failing to surpass . Typically, the snow line in winter is around 900 metres (3000 ft), however sea level snow falls several times each winter as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Lyell Mining And Railway Company
Mount Lyell Mining and Railway Company was a Tasmanian mining company formed on 29 March 1893, most commonly referred to as ''Mount Lyell''. Mount Lyell was the dominant copper mining company of the West Coast from 1893 to 1994, and was based in Queenstown, Tasmania. Following consolidation of leases and company assets at the beginning of the twentieth century, Mount Lyell was the major company for the communities of Queenstown, Strahan and Gormanston. It remained dominant until its closure in 1994. The Mount Lyell mining operations produced more than a million tonnes of copper, 750 tonnes of silver and 45 tonnes of gold since mining commenced in the early 1890s – which is equivalent to over 4 billion dollars worth of metal in 1995 terms. History In the early stage of operations, Mount Lyell was surrounded by smaller competing leases and companies. Eventually they were all absorbed into Mount Lyell operations, or were closed down. In 1903 the North Mount Lyell Copper Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rosebery, Tasmania
Rosebery is a town on the west coast of Tasmania, Australia. It is at the northern end of the West Coast Range, in the shadow of Mount Black and adjacent to the Pieman River now Lake Pieman. It lies on the Murchison Highway, 25 kilometres north-east of Zeehan and is part of the Municipality of West Coast Council. At the , Rosebery had a population of 752. The population of Rosebery declined by 22% in the years between 1996-2001. Its newer western area on the shore of Lake Pieman is known as Primrose. History Like most of the other settlements on the west coast of Tasmania, Rosebery is a mining town. In 1893, prospector Tom McDonald discovered gold in alluvial wash, along with boulders of zinc-lead sulphide in dense rainforest on the slopes of Mount Black. McDonald pegged several claims in the name of the Rosebery Prospecting Association (named after Lord Rosebery), which later became the Rosebery Gold Mining Company. The South Rosebery Mining Company was formed soon a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henty Gold Mine
The Henty Gold Mine is located at the head of the Henty River on the edge of the West Coast Range in Western Tasmania. It is approximately 30 km north of Queenstown. It is east of Zeehan and south of Rosebery. It can be reached by the Hydro-built road that passes between the Henty River and Tullah. History Operations began in the 1990s. Its orebody and viability was ascertained from earlier exploration in the area during the 1970s when the priority was for other forms of mineralization within the Mount Read Volcanic Belt. Henty lies within the mineral rich Mt. Read Volcanic Belt in Western Tasmania that hosts the Hellyer, Que River, Rosebery, Hercules and Mount Lyell base metal deposits. The eastern side of the belt is dominated by the Henty Fault which runs north-east for over 60 kilometres between Mount Charter and Mount Read. The Henty operation is based on a series of structurally complex high-grade zones of gold mineralisation that occur within a package of highly a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
West Coast Range
The West Coast Range is a mountain range located in the West Coast region of Tasmania, Australia. The range lies to the west and north of the main parts of the Franklin-Gordon Wild Rivers National Park. The range has had a significant number of mines utilising the geologically rich zone of Mount Read Volcanics. A number of adjacent ranges lie to the east: the Engineer Range, the Raglan Range, the Eldon Range, and the Sticht Range but in most cases these are on a west–east alignment, while the West Coast Range runs in a north–south direction, following the Mount Read volcanic arc. The range has encompassed multiple land uses including the catchment area for Hydro Tasmania dams, mines, transport routes and historical sites. Of the communities that have existed actually in the range itself, Gormanston, is probably the last to remain. Geographical features These are determined by a number of factors - the southerly direction of glaciation in the King River V ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology Of Tasmania
The geology of Tasmania is complex, with the world's biggest exposure of diabase, or dolerite. The rock record contains representatives of each period of the Neoproterozoic, Paleozoic, Mesozoic and Cenozoic eras. It is one of the few southern hemisphere areas that were glaciated during the Pleistocene with glacial landforms in the higher parts. The west coast region hosts significant mineralisation and numerous active and historic mines. Geological history The earliest geological history is recorded in rocks from over . Older rocks from western Tasmania and King Island were strongly folded and metamorphosed into rocks such as quartzite. After this there are many signs of glaciation from the Cryogenian, as well as the global warming that occurred at the start of the Ediacaran period. An orogeny folded the older Precambrian rocks. In the Cambrian time the Tyennan block forming the south west and central Tasmania, was pushed up and slightly over the land of north west Tasmania, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geologic Formations Of Australia
Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology, and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Earth's past climates. Geologists broadly study the properties and processes of Ear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Western Tasmania
The West Coast of Tasmania is mainly isolated rough country, associated with wilderness, mining and tourism. It served as the location of an early convict settlement in the early history of Van Diemen's Land, and contrasts sharply with the more developed and populous northern and eastern parts of the island state. Climate The west coast has a much cooler and wetter climate when compared to the east coast. Frequent low pressure systems hit the west coast causing heavy rain, snow, and ice. The West Coast Range blocks these systems from impacting the east, therefore making the West Coast a rain catchment with some areas receiving over of rain a year. In winter temperatures at sea level hover around , and when not raining, morning frost is common. The temperatures are much lower inland from the coast with maximums in winter often failing to surpass . Typically, the snow line in winter is around 900 metres (3000 ft), however sea level snow falls several times each winter as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanoes Of Tasmania
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and most are found underwater. For example, a mid-ocean ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from the core–mantle boundary, deep in the Earth. This results in hotspot volcanism, of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plates slide pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambrian Volcanism
The Cambrian Period ( ; sometimes symbolized Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million years ago (mya) to the beginning of the Ordovician Period mya. Its subdivisions, and its base, are somewhat in flux. The period was established as "Cambrian series" by Adam Sedgwick, who named it after Cambria, the Latin name for 'Cymru' (Wales), where Britain's Cambrian rocks are best exposed. Sedgwick identified the layer as part of his task, along with Roderick Murchison, to subdivide the large "Transition Series", although the two geologists disagreed for a while on the appropriate categorization. The Cambrian is unique in its unusually high proportion of sedimentary deposits, sites of exceptional preservation where "soft" parts of organisms are preserved as well as their more resistant shells. As a result, our understanding of the Cambrian biolo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
