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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Refill of waste<br />
Rill mining in progress.<br />
garPenBerg, Sweden<br />
Cut off slot<br />
approximately 17 m-long, holes are<br />
blasted into the void. Three rows having<br />
a total of 24 holes are blasted simultaneously.<br />
After mucking out each blast,<br />
new waste is discharged into the stope<br />
forming a 45 degrees rill down into the<br />
drawpoint. As the waste material will<br />
stay quite stable at 45 degrees rill angle,<br />
the risk of ore dilution is negligible.<br />
Output limitations<br />
The total mine output is restricted to<br />
the 1.2-1.3 Mt/y hoisting capacity<br />
Drill pattern for cut off slot.<br />
Waste<br />
Rill mining in progress<br />
Blasted ore<br />
available, with a limited amount of<br />
truck ore haulage to surface possible.<br />
And, although flotation capacity has<br />
been improved, concentrator throughput<br />
is now limited to the same sort of<br />
tonnage by grinding mill capacity.<br />
Assuming dem<strong>and</strong> for Garpenberg concentrates<br />
increases in the near term, it<br />
will be necessary for New Boliden to<br />
decide whether to increase hoisting<br />
capacity.<br />
Developing the now-available reserves<br />
for higher long-term production using ad-<br />
ditional hoisting <strong>and</strong> processing capacity<br />
might double the amount of investment<br />
initially planned.<br />
new drilling technology<br />
Atlas Copco has supplied drilling equip-<br />
ment to Boliden’s underground mines<br />
for many years. Recently, the company<br />
has worked particularly closely with<br />
Garpenberg on the development of<br />
computer-based technology for more<br />
precise drilling <strong>and</strong> blasting to enhance<br />
productivity <strong>and</strong> reduce ore dilution <strong>and</strong><br />
operating costs.<br />
50 underground mining methods<br />
1.8 m<br />
8 holes in each fan Ø 70 mm<br />
3 fans in one blast<br />
45°<br />
One fan<br />
Max<br />
2 m<br />
70°<br />
Approx. 15 m<br />
Approx. 15 m