KRISKA, BAGEA (2015) ANALISIS BLAST DAMAGE TERHADAP GROUND SUPPORT DI BC-613 TAIL ACCESS DAN BC-612 TRANSFER ACCESS, GRASBERG BLOCK CAVE,PT. FREEPORT INDONESIA. Masters thesis, UPN ''VETERAN'' YOGYAKARTA.
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Abstract
PT. Freeport Indonesia is a copper and goldmining company. Grasberg Block
Cave (GBC) is one of the underground mine site located at PT. Freeport
Indonesia. The mining method in underground mines Grasberg Block Cave using
Caving method.
BC-613 Tail Access and BC-612 Transfer Accessare the location at GBC that
uses blasting method to rock excavation. The location is in the same lithology
(diorite rock) with an average density of 2.7 ton / m3 and the planned opening
hole size of 5.5 mx 5.5 m. PT. Freeport Indonesia uses the same blasting
geometry and support geometry for this location.
Overbreak often occur at this location. The cause of overbreak expected due
generalization blasting geometry used and differences in the condition of the rock
mass (rock mass rating). Overbreak incur additional costs due to the addition of
ground material support to be installed. Generalization of support geometry also
potentially reduce the value of the safety buffer even though the number of
support that are installed have been added since the overbreak.
The calculation is done to determine the effect of the RMR to damage radius,
getting constant formulation of rocks against RMR, a large increase in costs due
overbreak, and the formulation of support space
Based on this research, it is known that the reductionof RMR value will
increasing the damage radius, obtained the formula for determining the value of
burden correction = (68.585-RMR)/0.5904, the formulation support space for
primary support = -0,3573 x (% Overbreak) + 1,1904, the formulation support
space for secondary support (overbreak more than 28,85%) = -0,3867 x (%
Overbreak) + 1,3017, the actual additional costs because overbreak of US$
5.44/tonnes, and the recommendation additional costs due overbreak to maintain
the value of the safety factor of the support of US$ 9.965/tonnes.
Keyword : Blast Design, Overbreak, Support Design, Cost
| Item Type: | Thesis (Masters) |
|---|---|
| Subjek: | T Technology > TN Mining engineering. Metallurgy |
| Divisions: | x. Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Erny Azyanti |
| Date Deposited: | 17 May 2016 02:40 |
| Last Modified: | 17 May 2016 05:39 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/1112 |
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