#TITLE_ALTERNATIVE#

• Main Author: Harjanto (NIM 220 97 006), Agus
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/7065
• Institution: Institut Teknologi Bandung

Abstract : <br /> <br /> <br /> <br /> The Beruang Tengah prospect is located on the upper most of the Beruang Tengah river and includes parts of administrative districts, Tumbang Miri, Kapuas Hulu, Central Kalimantan province, between longitudes 113 26 45 E and 113 27 35 E, and between the equator 00 37 17 S and 00 38 44 S. The base map for the 1 : 5.000 scale. <br /> <br /> <br /> <br /> The Lithostratigraphy of Beruang Tengah consist of Granodiorite intrusives, Diorite intrusives, dacites, andesites, clay and tuff. There are 4 stages of alteration-mineralization found in Beruang Tengah : (1) Serisite-Chlorite-Biotite zones with dissimineted molibdenite and magnetite grains (T > 350 C) and the alteration found is potassik type, (2) Quartz-Serisite-Chlorite zones with dissimineted pyrite, chalcopyrite, magnetite, hematite (T 275 C-350 C) and the alteration found is phyllic type, (3) Epidote-Chlorite-Calcite (T 200 C-300 C) and the alteration found is prophyllitic type, (4) Hlite-Kaolinite-Monmorilonite zones (T 150 C- 200 C) and the alteration found is argillic type. The assay results of limited rock samples collected show that the higher copper results ( > 1000 ppm ) are associated with the samples collected from the upper most part of Beruang Tengah rivers, which are from the potassic alteration zone. <br />