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334:. Ore extraction started at level 500, from which the process proceeds upwards towards the bottom of the open-pit. Fully excavated primary stopes are filled with waste rock. From each stope, the ore is carried to an underground crushing station. The crushed ore is transferred via a conveyor belt to crushed ore silos located close to the mine shaft and further to a skip via a measuring pocket. The ore is hoisted through the shaft to an unloading silo located in a 70-meter-tall lifting tower, from where it is forwarded to the concentration process.
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technological applications and the use of advanced working methods. Operations cause only a minor environmental impact because of the insolubility of the oxidic chromite ore, the chemical-free concentration method based on gravity, and the sealed process water circulation covering the entire mine and concentration process.
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ore bodies, underground mining is beginning in the
Surmaoja ore body alongside the other two ore bodies from level 500 upwards. Because of the mining method used, the ore extraction process in each ore body always proceeds upwards towards the bottom of the open-pit mine, while filling fully extracted
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ratio of 1.6. According to the survey report by the
Geological Survey of Finland, the chrome ore deposit extends to a depth of two to three kilometres, possible even to four kilometres. Previously, it was estimated that the ore and mineral reserves in Kemi would be sufficient for 70–80 years, but on
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led the exploration. After its baseline study, the
Geological Survey of Finland handed over the deposit to Outokumpu Oy, which continued the survey until 1962. At the time, the size of the ore body was estimated to be 30 million tonnes. In autumn 1964, Outokumpu decided to start utilizing the chrome
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Ore is concentrated at two concentration plants located at the Kemi Mine into lump and fine concentrate. In the first phase, the ore is crushed for further processing. At the lump concentration plant, lump concentrate is separated from the crushed ore using the sink-and-float method. The grain size
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reserves is approximately 98 million tonnes, having been evaluated to a depth of one kilometre. The deposit, with an average thickness of 40 meters, is nearly vertical and approximately one kilometer in length. The depth of the ore deposit remains unclear. The ore contains 26% chromium oxide with a
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A memorystone was erected in the exact location where the first sample of chromite ore was found on 15 June 1959. The Mine was open six years later. Text in
English: "From this location found diver Martti Matilainen 15 June 1959 a chromite malm stone, that lead to opening of Kemi Mine and Tornio
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The annual production capacity of lump concentrate is approximately 400,000 tonnes and that of fine concentrate is approximately 850,000 tonnes. The content of chromium oxide in the concentrates is 36% and 45%, respectively. The concentrate is carried to the Tornio ferrochrome plant by road
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In terms of excavated volume, the mine, which opened in 1968, is among the largest in
Finland, with an annual excavated volume of 2.4 million tonnes of ore. By the end of 2005, a total of 31.4 million tonnes of chromite ore had been extracted from various open-pit mines. Opened in 2003, the
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Operational safety, cost-effectiveness and eco-friendliness are characteristics of the Kemi Mine. Low accident figures, together with clean and properly organized working environments, both 500 meters underground and on the surface, make an excellent setting for effective production, modern
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is 12–100 mm. After grinding, feed material from the fine concentration plant is concentrated into fine concentrate using spiral separators. At the fine concentration plant, the ore is concentrated into fine concentrate using gravitational and highly magnetic concentration methods.
385:–Tornio track via a connection known as the “Elijärvi mine track”: Rail transportation of ore ended on 31 December 2005 when a local road transportation entrepreneur made a better offer for the transportation of ore between the Kemi Mine and the Tornio plant.
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257:, one was discovered to be high in chrome content on 30 June 1959. The sample was taken from the current mine area, and the ore deposit was discovered by the next spring. Geologist
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manufacturing chain owned by
Outokumpu in the Kemi-Tornio region. The Kemi Mine has approximately 400 employees every day, both employees of Outokumpu and contractors.
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The excavation and construction of the underground mine started in 1999. Open-pit mining ended at the Kemi Mine in
December 2005 with the final open-pit blasting.
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the basis of more recent information, it is possible that there will be extractable ore for hundreds of years, even after the planned doubling of production.
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Hedman, Ossi: Kemin kaupungin historia (History of the City of Kemi). 1st section, pp. 640–644. Tampere: Kustannusosakeyhtiö Sanan Tien kohopaino, 1969.
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Chromite ore was extracted from open-pit mines reaching depths of approximately 200 meters until 2005. In 2003, underground mining began.
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in autumn 1965. At the same time, earth-moving work began in the future mine area. The first mine buildings were completed late in 1966.
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Maintenance of the underground movable machinery takes place underground, where the facilities and equipment required for
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material in the steel manufacturing process – is what makes the steel manufactured at the Tornio
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underground mine had produced 10.6 million tonnes of chromite ore by the end of 2013.
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Signs of the existence of a chromite ore body were first discovered by amateur diver
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for the manufacture of ferrochrome at the ferrochrome plant located in
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The underground mine is accessible either via an incline ramp or a
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The purpose of the Kemi Mine in the long production chain from
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ore to stainless steel is to produce concentrates from ore as
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The Kemi Mine opened in 1968. Initially, it operated as an
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412:"Kemin kaivoksessa riittää malmia jopa sadoiksi vuosiksi"
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190:. It is located in Elijärvi, in the municipality of
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292:The Kemi Mine is the only chromium mine in the
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463:Data materials - Finnish mining industry
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206:. It is also part of the integrated
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131:65.783°N 24.717°E
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421:16 February
416:Yle Uutiset
343:ventilation
259:Aarno Kahma
237:stainless.
235:steel plant
208:ferrochrome
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110:Coordinates
472:Categories
389:References
332:mine shaft
301:chrome to
264:Perta-aapa
147:Production
381:from the
180:Kemi Mine
171:Outokumpu
63:Kemi mine
25:Kemi mine
483:Keminmaa
288:Ore body
268:Elijärvi
231:alloying
219:chromite
192:Keminmaa
156:Chromium
152:Products
78:Location
39:Location
298:mineral
279:furnace
245:History
200:Finland
167:Company
122:24°43′E
119:65°47′N
104:Finland
100:Country
94:Lapland
227:Tornio
89:Region
162:Owner
423:2016
383:Oulu
379:rail
358:Viia
303:iron
210:and
196:Kemi
178:The
82:Kemi
266:to
204:ore
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