Characteristics and distribution of gold in intermediete sulfidation deposit at Cipanggleseran, Banten, Indonesia

[摘要] Cipanggleseran area is located within the Sunda-Banda magmatic arc. Physiographically, it is included into the Bayah Mountain Zone. This zone is a potential complex of gold-silver mineral hydrothermal properties that is divided into 3 complexes, namely Cibaliung Complex, Bayah Dome Complex, and Ciemas Complex. And the research area which is in the Bayah Dome Complex has the intermediate sulfidation type of gold deposit. There are 2 steps in this research. The first step is mapping and sampling vein which indicated as a place of accumulation of this gold. The second step is studio analysis for example mineragrafi analysis on microscope and SEM EDX analysis. The gold and silver mineralization of the Cipangleseran area is found in quartz vein that have a rich composition of shulpide minerals for instance, pyrite, chalcopyrite, galena, sphalerit, in sompe places found covellit, chalcosite, and azurite, with characteristic of the texture such as, crustiform-colloform, cockade, and banded. Vein with this characteristic produce numerous gold and silver. Mineral carrier of gold in the form of electrum and native gold which present as visible gold and invisble gold. Invisible gold is present in minerals quartz, sphalerite, chalcopyrite and pyrite. Generally, visible gold is associated with sulphide minerals that act as a host mineral. The gold ore is distributed as free gold in quartz, inclusion in sphalerite, pyrite, chalcopyrite, and coexist on sulphide minerals such as sphalerite, pyrite and chalcopyrite with gold grain size of 4.5-52.22 μm.

[发布机构] Geological Engineering Department, Universitas Pembangunan Nasional Veteran, Yogyakarta; 55283, Indonesia^1

[效力级别] 矿业工程

[关键词] Gold and silver;Gold grains;Hydrothermal properties;Invisible golds;Magmatic arcs;Quartz vein;SEM-EDX analysis;Sulfidation