GEOMETALLURGICAL STUDY OF COPPER AND GOLD DOMAIN, BATU HIJAU PORPHYRY DEPOSIT, SUMBAWA REGENCY, WEST NUSA TENGGARA
Batu Hijau Open Pit is the second-largest porphyry Cu - Au deposit in Indonesia with 2,6 Blbs Cu and 2,7 Moz Au proven reserved. By 2017, PT. AMNT had started phase-7 of pit development by uncovering, enlarging the pit, and planning the extraction strategy. This research is aimed to help extracti...
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Format: | Final Project |
Language: | Indonesia |
Subjects: | |
Online Access: | https://digilib.itb.ac.id/gdl/view/46544 |
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Institution: | Institut Teknologi Bandung |
Language: | Indonesia |
Summary: | Batu Hijau Open Pit is the second-largest porphyry Cu - Au deposit in Indonesia with 2,6
Blbs Cu and 2,7 Moz Au proven reserved. By 2017, PT. AMNT had started phase-7 of
pit development by uncovering, enlarging the pit, and planning the extraction strategy.
This research is aimed to help extraction planning by collaborating geological aspects
with metallurgical performances of the ore to maximize the profit of this phase. Core
logging, petrographical & mineragraphical analyses, and XRD was carried out to obtain
geological characteristic including lithological distribution, alteration, and mineralization
zone. Secondary data from PT. AMNT are included in form of geological map and section
reference, borehole collar, structural geology & lithology, Cu & Au grade, and Cu & Au
flotation recovery to obtain better geological condition and to correlate geological and
metallurgical aspects. A series of Middle Miocene – Pliocene intrusions has been
identified and consists of (older-younger) Andesite, Quartz Diorite, Intermediate
Tonalite, and Young Tonalite. The alteration shows the existence of enclosed Biotite -
Magnetite – Quartz ± Actinolite zone by Chlorite - Sericite - Quartz ± Calcite ± Epidote
zone and Kaolinite - Quartz on the top of paleosurface. Oxidation zone exists as a cap of
others mineralization while pyrite dominant zone encloses chalcopyrite and bornite
dominant zone. Higher copper and gold grade tend to exist near the Intermediate Tonalite
intrusion, while the youngest intrusion (Young Tonalite) shows lower grade than others.
Lower Cu and Au recovery identified on top of the research area shows good correlation
with the number of identified oxide minerals. Lower Au grade also shows a good
correlation with lower Au recovery. Based on those analyses, ten and nine Cu and Au
geometallurgical domains are constructed that reflects geological aspects with
metallurgical performance. Recommendation for each zone processing is also suggested
to optimize the generated output.
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