STUDY OF GEOCHEMICAL CHARACTERISTICS OF ADVANCED ARGILLIC ALTERATION ROCKS IN EPITHERMAL HIGH SULPHIDATION GOLD DEPOSITS
Acid rock drainage (ARD) is a water drainage or water seepage caused by mining <br /> <br /> activity process that exposing the rock and characterized by high acidity or the low <br /> <br /> pH value (Gautama, 2014). Mining activity can be done in many type of deposits, <...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/25373 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Acid rock drainage (ARD) is a water drainage or water seepage caused by mining <br />
<br />
activity process that exposing the rock and characterized by high acidity or the low <br />
<br />
pH value (Gautama, 2014). Mining activity can be done in many type of deposits, <br />
<br />
such as epithermal high sulphidation deposits that have some alteration zone, there <br />
<br />
are silicic, advanced argillic, argillic, and prophyllitic. Advanced argillic <br />
<br />
alteration zone contains native sulphur, and pyrite minerals which are sulphide <br />
<br />
minerals that forming acid rock drainage. The objective of this study was to do the <br />
<br />
prevention, handling and management of acid rock drainage by predicting the <br />
<br />
potential of acid rock drainage formation and predicting the leachate water quality <br />
<br />
of advanced argillic alteration rock samples. <br />
<br />
Based on the tests, there are two classifications for geochemical characteristics of <br />
<br />
rocks : 3 samples of PAF-LC (Potential Acid Forming-Low Capacity) as rocks that <br />
<br />
potentially produce acid rock drainage with weak acidity and 3 samples of PAFHC <br />
<br />
(Potential Acid Forming-High Capacity) as a rock that potentially produces <br />
<br />
acid rock drainage with strong acidity. Leachate water from all samples needs to <br />
<br />
be processed first because the pH of the water is lower than the pH range allowed <br />
<br />
on the quality standard in the Kepmen LH No. 202 Th. 2004 that was 6-9. In <br />
<br />
addition, the dissolved metal content also increases as TDS increases as pH <br />
<br />
decrease, this allows the dissolved metal content to exceed the maximum limit of <br />
<br />
quality standards. Encapsulation methods are needed to minimize rock exposure <br />
<br />
and prevent the formation of acidic conditions capable of dissolving metals. |
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