Djup gruva kiruna
The Kiruna mine is the largest and most modern underground iron ore mine in the world. In the mine produced Since mining began at the site in , the mine has produced over million tonnes of ore. In , it was decided that the present centre of the city would need to be relocated to accommodate mining-related subsidence. The relocation would be made gradually over decades.
On May 18, an earthquake of approximate 4. The ore deposit at Kiruna is part of a larger iron ore province stretching west-east from Kiruna to the Finnish border. The ore is predominately magnetite and disseminated interstitial apatite , with an average of 0.
Within the orebody, there is a volume of hematite ore with the same strike direction as the main orebody. The rare earth elements have been known about at this location for over years and studied in detail before. The origin of the Kiruna ore has been the matter of a protracted scientific debate, with the main point of contention being whether the ore is solidified magma or not.
The Kiruna mineral deposit was formed following intense volcanic activity. Later the whole body was tilted to its current dip of 50 to 60°. The hematite bodies of Kiruna are considered by R. Frietsch to be "hydrothermal impregnations". The geology of the Kiruna ore has many parallels to that of the iron ore of El Laco volcano in Chile, leading to the claim they were both formed by volcanic activity.
Kirunagruvans Visitor Centre öppnar för turistturer
In Tibor Parák pointed out a series of problems with the magmatic origin theory and proposed instead that the ore originated as a sediment in a volcanic environment. The existence of "abundant fragments and balls" of ore found in the hanging wall of the Kiruna Ore and the nearby Loussavaara Ore are deemed by Párak to be contrary to a magmatic origin for the ore. Parák further argues that the " ore breccia " at Loussavaara Ore is due to its chemistry and texture not equivalent to the main ore bodies.
The waste rock at the footwall of the ore is syenite porphyry. In some rare cases nodules are filled with zircon.
Snart är Kirunagruvan igång igen – efter Sveriges största
The hanging wall of the Kiruna ore is made up of quartz porphyry. In the Kiruna Narvik Railway was completed, allowing the shipment of ore through the ice-free port of Narvik. In the beginning, surface mining was used, but the mine has been mined with the sublevel caving mining method since the s. Until the deepest level of the mine reached metres 2, ft , but after mining went deeper, reaching a depth of 1, metres 3, ft.
The re-development of Kiruna is a reconstruction project, as the Kirunavaara mine, run by LKAB, undermines the current town center. The town center is to be moved 3 km 1. In , it was decided that the city center would need to be relocated to accommodate mining-related subsidence. The relocation was to be made gradually over the coming decade. In January a new location was proposed, to the northwest at the foot of Luossavaara mountain, by Lake Luossajärvi.
The first physical work moving the town commenced in November , when work on the new main sewer pipe started. In the same week, first sketches for the layout of the new part of the town became available.
Kirunagruvan – en gruva med växtvärk –
A more official sketch was published early in the spring of , which was then discussed with various interest groups before a further version was to be produced. Contents move to sidebar hide. Article Talk.