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The use of the Main Ramp as a Mine Exhaust at the Kencana Mine, Indonesia


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Author D J Brake and C Jones


Faced with the need to improve workplace conditions in both its development
and production headings in its existing K1 orebody, as well as its new K Link
and K2 orebodies, the Kencana mine in Indonesia took the novel approach of
reversing the ventilation on most of its access ramp by outcasting up the ramp
to the portal. Working levels were then fed with fresh air via auxiliary fans
sealed into the current surface ‘egress’ intake raises (ladderways) or another
small surface intake raisebore rather than from fans hung in the ramp as in the
past. Outcasting the portal provided a substantial increase in the total mine
exhaust capacity allowing fewer levels to be ventilated in series and
significantly improving conditions, especially in the most difficult workplaces
to ventilate. It also reduced the consequences if there was to be a fire on a
vehicle in the ramp. The same system using the ramp as an exhaust is also
intended to be used as part of the final ventilation solution for the new K2
orebody which also uses a novel single surface ventilation shaft that is
vertically split into separate intake and exhaust compartments using a concrete
brattice. Using the main ramp as an exhaust has potential application in many
other operations in Australia using surface ramps which otherwise frequently
suffer from overuse of series ventilation circuits and poor working conditions
at the mine bottom.

Brake, D J and
Jones, C, 2011. The
use of the main ramp as a mine exhaust at the Kencana mine, Indonesia, in Proceedings 11th AusIMM Underground Operators’

pp 13-18 (The Australasian Institute of Mining and Metallurgy: