Analysis of artificial ground support application on hydrothermal alteration zone in gold mining operation, South Tapanuli Regency, North Sumatera Province

Slope stability become major issues in open-pit mining operation. Gold commodity usually find and controlled by structure and alteration zone which may affect its stability. This study aims to describe and provide a mitigation practice on controlled slope stability issue on hydrothermal alteration z...

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Bibliographic Details
Main Authors: Dwinagara, Barlian, Perdana, Ocky Chandra, Lusantono, Oktarian Wisnu, Koesnaryo, S.
Format: Conference Proceeding
Language:English
Subjects:
Breccia
Gold
Gold mines & mining
Lithology
Open pit mining
Safety factors
Slope stability
Sprayed concrete
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Summary:Slope stability become major issues in open-pit mining operation. Gold commodity usually find and controlled by structure and alteration zone which may affect its stability. This study aims to describe and provide a mitigation practice on controlled slope stability issue on hydrothermal alteration zone in a gold mining company that located in South Tapanuli Regency, North Sumatera Province, Indonesia. Clay-Breccia Paleo Metasomatic (CBPM) described as lithology unit which indicated as weak-layered hydrothermal alteration zone in the eastern slope of Barani Pit. CBPM is known as high-oxidized zone, brittle, and high-sensitivity on water. The contact zone between Volcanic Andesitic Hornblende (VANh) and CBPM known with its Factor of Safety (FoS) of 2.02 and 0.47 respectively. CBPM shown as the weakest zone and required special attention and treatment. The engineering methodology applied to stabilize CBPM zone using artificial ground support (AGS). AGS applied in the mining area were using a combination of cable bolts and shotcrete. AGS shown able to increase the FoS up to 2.4.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0224892