Mining_Methods_UnderGround_Mining - Mining and Blasting
Mining_Methods_UnderGround_Mining - Mining and Blasting
Mining_Methods_UnderGround_Mining - Mining and Blasting
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flexibility during drilling <strong>and</strong> bolting.<br />
The COP 1432 rock drill was, before being<br />
replaced with COP 1132, the shortest<br />
in its class, with modern hydraulic<br />
reflex dampening for high-speed drilling<br />
<strong>and</strong> excellent drill steel economy. It<br />
has separately variable frequency <strong>and</strong><br />
impact power, which can be adapted to<br />
certain drill steel/rock combinations.<br />
The BUT 35 HBE heavy-duty boom<br />
is perfect for direct, fast <strong>and</strong> accurate<br />
positioning between holes, <strong>and</strong>, at Zinkgruvan,<br />
this has been extended by 700<br />
mm. Large capacity working lights <strong>and</strong><br />
a joystick-operated spotlight ensure that<br />
the operator has outst<strong>and</strong>ing visibility.<br />
Profitable collaboration<br />
The Rig Control System (RCS), originally<br />
developed for Boomer rigs, is now<br />
also installed on Simba <strong>and</strong> Boltec rigs,<br />
so the mine benefits from the common-<br />
ality. Atlas Copco has total responsibility<br />
for all service <strong>and</strong> maintenance operations<br />
on its equipment at Zinkgruvan,<br />
<strong>and</strong> has three service engineers stationed<br />
permanently at site. The company<br />
is also under 3-5 year contract for<br />
the supply, maintenance <strong>and</strong> grinding of<br />
Secoroc rock drilling tools, overseen by<br />
a Secoroc specialist.<br />
From the mine point of view, they be-<br />
lieve they have profited by their collaboration<br />
with Atlas Copco, particularly in<br />
the field testing of the new generation<br />
rigs. Early exposure to the capabilities<br />
of these machines has allowed them to<br />
adapt their mining <strong>and</strong> rockbolting<br />
methods to the new technology, giving<br />
them a head start on the savings to be<br />
achieved. Also, by leaving the long-term<br />
maintenance <strong>and</strong> supply of rock drilling<br />
tools in the h<strong>and</strong>s of Atlas Copco, they<br />
are free to concentrate on their core<br />
business of mining. Above all, it enables<br />
them to make accurate predictions<br />
of drilling <strong>and</strong> bolting costs, which will<br />
improve overall cost control.<br />
acknowledgements<br />
This article is based on a paper written<br />
by Gunnar Nyström. Atlas Copco also<br />
gratefully acknowledges the inputs of<br />
Jonas Södergren, Hans Sjöberg <strong>and</strong><br />
Conny Öhman, all of Zinkgruvan<br />
<strong>Mining</strong>.<br />
Typical<br />
cable<br />
bolting<br />
∅ 51 mm<br />
drill bit<br />
Crown pillar<br />
Typical cross section of the orebody looking east.<br />
Primary stope drilling layout.<br />
30 m<br />
Front view<br />
zinkgruVan, Sweden<br />
underground mining methods 57<br />
4.5 m<br />
8-15 m<br />
Production<br />
drilling<br />
∅ 74 mm<br />
drill bit<br />
Drawpoint level<br />
Opening slot<br />
Top view<br />
Opening raise<br />
Cut off raise