"January 2008. The Oyu Tolgoi mining team celebrated the completion of Shaft #1 to a
final depth of 1,385 metres – the deepest underground shaft ever excavated in Mongolia.
By the end of 2011, a 10,241-metre-long (6.4-mile) web of development tunnels reached out
from Shaft #1’s 1,300-metre level to the Hugo Dummett high-grade copper and gold deposit."
visual copper, page-34
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