The Faraday granite sheet dips to the south and it is the southern edge of the Hastings Highland gneiss complex.
The Faraday granite is a sheet of granite covered by gneisses and metagabbro. The Cardiff plutonic complex consists mainly of three southeast-dipping cylindrical sheet intrusions: the Centre Lake granite, the Monck Lake granite, and the Deer Lake syenite. All these rocks contain younger granitic and syenitic intrusions. The Cheddar complex is a circular double dome of granitic rock surrounded by paragneiss, para- amphibolite, and pyroxene granulite. The key geological features in the Bancroft area relevant to uranium mining are three circular granitic complexes, each about 10 kilometres (6.2 mi) across. Of the seven global locations where uranium is mined rom intrusive rock, Bancroft is the only one where it is mined from intrusive rocks of the pegmatite type. Bancroft, known as the "Mineral Capital of Canada" is one of only five major locations in the world where uranium is extracted from intrusive rocks – the others being Rössing uranium mine, Trekkopje mine, Utah, Twin Buttes, Ilimaussaq deposit and Palabora. In Canada, 99% of known uranium occurrences and 93% of properties producing uranium are on the Canadian Shield, almost all on the western and southern edges of it. Some uranium ores in these structures are about 1,000 million years old, while others are understood to be 1,200 million years old. Volcanic eruptions had spouted through sediments, recrystallizing them into layers of banded gneisses – incorporating limestone, graphite, gabbro and diorite – rich in iron and other dark minerals. Uraninite in pegmatite, from Haliburton Countyĭuring the most recent ice age, in the area of what is now Bancroft, Ontario, ancient glaciers removed soil and rock, exposing the Precambrian granite that had been the heart of volcanic mountains on an ancient sea bed. 2.2.4 Faraday and Madawaska Mine geology. 2.2.3 Decommissioning of Madawaska Mine (1982 to present). 2.2.2 Mining operations as Madawaska Mine (1975 to 1982). 2.2.1 Mining operations as Faraday Mine (1948 to 1964). A twofold increase in lung cancer development and mortality has been observed among former mine workers. Bancroft continues to be known for gems and mineralogy, and has three decommissioned uranium mines and one that is undergoing rehabilitation. Mining resumed when uranium prices rose during the 1970s energy crisis, but this was not long lasting. : 1 By 1963, the federal government had purchased more than $1,500 million of uranium from Canadian producers, but soon thereafter the global supply of uranium increased, prices fell and the government cancelled all contracts to buy. By 1958, Canada had become one of the world's leading producers of uranium the $274 million of uranium exports that year represented Canada's most significant mineral export. Mining activities were conducted during two periods, 1956–19–1982, when uranium prices made underground hard-rock mining of the ores economically viable.Īs a result of activities at its four major uranium mines, Bancroft experienced rapid population and economic growth throughout the 1950s. 
Bayne in a 1977 report as the "greatest uranium prospecting rush in the world". Activity in the mid-1950s was described by engineer A. S. In the context of mining, the "Bancroft area" includes Haliburton, Hastings, and Renfrew counties, and all areas between Minden and Lake Clear. Benelli M3 Super 90 upper receiver top railīurris AR-P.E.P.R.Uranium mining in Bancroft represents one of two major uranium-producing areas in Ontario, and one of seven in Canada, all located along the edge of the Canadian Shield.
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