Actual ore extraction, according to the United States Geological Survey, peaked in 2007 at 77.9 million tonnes of ore ( 42.8 million tonnes of pure iron content ).
22.
Construction of Devonshire Dock commenced in 1863 and was funded by the Furness Railway, who at the time controlled the new town's economy ( iron ore extraction and transportation ).
23.
The whole region was not only strategically situated but was also from an early period a highly productive centre for ore extraction and metal working, which made it unusually valuable.
24.
Through the use of more modern mining equipment, the pit achieved an ore extraction of 50 tonnes per man per shift, even internationally-based on the raw ore quantities-of considerable value.
25.
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 areas with waste rock.
26.
The square set timbering method devised by Deideshimer slowed the swelling action long enough for ore extraction, though with time the timbering was crushed by the enormous pressures found in the Comstock mines.
27.
The underground mine is accessible either via an incline ramp or a mine shaft . Ore extraction started at level 500, from which the process proceeds upwards towards the bottom of the open-pit.
28.
The town was earlier dominated by iron-ore extraction at Gr�ngesberg ore field ( Gr�ngesbergs malmf�lt ) from the 16th century to 1989 . In January 1990 was the last ore-train from Gr�ngesberg to Oxel�sund.
29.
The development plan for Apatit to 2015 assumes an optimal level of apatite concentrate production of 8.5 Mt / yr that would require levels of ore extraction of 27 to 28 Mt / yr.
30.
Although the current plans are for iron ore extraction, there have been suspicions that uranium will also be mined at Mount Pipet, in line with Burma's recently announced nuclear ambitions and partnership with Russia.
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