Canadian Mining Journal


COPPER-GOLD: Turquoise Hill reaches shaft sinking milestone

The Oyu Tolgoi mill will be expanded to accommodate underground ore. (Image: Turquoise Hill Resources)

MONGOLIA – Vancouver-based Turquoise Hill Resources says it has reached a significant development milestone at its Oyu Tolgoi underground copper-gold mine in the South Gobi region – The No.5 ventilation shaft has been sunk to its final depth of 1,178 metres.

Shaft 5 is 6.7 metres in diameter. Installation of the exhaust fan began Q4 2017 and is on target to be completed in the next month or two. Block caving is planned.

Turquoise Hill underground development at Oyu Tolgoi carries a price tag of US$4.2 billion. The mine had proven and probable reserves of 1.45 billion tonnes grading 0.86% copper, 0.30 g/t gold, and 1.97 g/t silver at Dec. 31, 2015 (the most recent 43-101 report filed). Open pit mining has been done since 2013, so the resource numbers can be expected to have changed somewhat. The concentrator has a nameplate capacity of 100,000 t/d.

The Oyu Tolgoi mine is owned 66% by Turquoise Hill and 34% by the Mongolian government. Learn more at (available in English and Mongolian).