STUDY OF GEOCHEMICAL CHARACTERISTICS OF ARGILLIC ALTERATION ROCKS IN EPITHERMAL HIGH SULPHIDATION GOLD DEPOSITS
The Mining process of gold ores (Au) in high sulphidation epithermal deposits can potentially produce acid mine drainage. In high sulphidation systems, the alteration zones formed a silicic zones, advanced argillic, argillic, and propylitic. The argillic zone is characterized by the presence of mine...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/28389 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The Mining process of gold ores (Au) in high sulphidation epithermal deposits can potentially produce acid mine drainage. In high sulphidation systems, the alteration zones formed a silicic zones, advanced argillic, argillic, and propylitic. The argillic zone is characterized by the presence of minerals kaolinite, illite-smectite, quartz, and disseminated pyrite. The first step in figuring out the potential of acid mine water formation in rocks is by doing rock geochemical properties assessment through static and kinetic tests. The results are then confirmed by XRF (X-Ray Fluorescence) test to find out the elements and XRD (X-Ray Diffraction) test to identify the minerals in the rock that have the potential to form acids. In addition, it is necessary to conduct the quality test towards the leachate water to observe the metal content inside, in order to estimate how much metals play the distinctive role of forming and neutralizing the acid mine drainage. The results of the leach water quality test will be compared to the quality standard, namely the Decree of the Minister of Environment No. 202 of 2004. <br />
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Based on the tests that have been carried out, there are 4 PAF-HC (Potentially Acid Forming-High Capacity) rocks that potentially produce acid mine drainage with strong acidity, 7 PAF-LC (Potentially Acid Forming-Low Capacity) rocks which has the potential to produce water acid mine with weak acidity and 1 NAF (Non-Acid Forming) rock which is a rock that does not have a potential to produce acid mine drainage. The purpose of acid mine management using encapsulation is to reduce porosity and trasnform the rock into non-permeable. Therefore they can reduce the rate of oxygen diffusion and infiltrate water into rock deposits containing sulfide minerals. |
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