[Course Online] Introduction to Intermediate Sulfidation Epithermal

Video Recap for “Introduction to Intermediate Sulfidation Epithermal” with Cendi Diar Permata Dana, S.T. (Former Vice President SEG UGM SC 2017) on May 2, 2020

[Course Event Report] Introduction to Intermediate Sulfidation Epithermal

International Lecture SEG UGM SC



Society of Economic Geologists Universitas Gadjah Mada – Student Chapter proudly presents:

SEG UGM-SC INTERNATIONAL LECTURE : Magmatic-Hydrothermal Au and Cu Deposits – Characteristics, Genesis and Exploration

Saturday, March 18th 2017
8 am – 4 pm
Auditorium UGM Central Library

With outstanding keynote speakers :
Prof. David Cooke
(Director of the TMVC Research Hub and Deputy Director of CODES Tasmania University)
Dr. rer. nat Arifudin Idrus
(Associate Professor in Economic Geology Universitas Gadjah Mada)
David Iswanto, S.T.
(Mineral Exploration Geologist P.T. J Resources Nusantara)

Register yourself
online : http://bit.ly/2kVcCrm
offline : KPFT UGM, March 1st – 17th 2017 ⏳8 am – 4 pm,

☡ registration will close if the quota of the lecture is reached

So… Grab your seat fast and don’t miss this golden opportunity to have new experience and better knowledge in hardrocks !

Contact Person :
Line id adiyatmaf
Line id adindaardianaa


Minnovation 2016


Society of Economic Geologist UGM-Student Chapter is Proudly Present:

MINNOVATION 2016: Exploration for Epithermal and Porphyry Precious Metal Systems in Java Island

The seminar will be held on:
Date: September 3rd. 2016 (08.00 am – 04.00 pm)
Location: JBN Hall

With keynote speakers:
Douglas J. Kirwin (Mineral Exploration Consultant & Former of SEG Vice President)
Adi Maryono (VP Exploration of J Resources Nusantara)
Sukmandaru Prihatmoko (President of IAGI)

Register yourself at KPFT UGM 1st Floor on Aug 23rd – Sept 2nd, 2016 (09.00 am – 04.00 pm) or Online
Gain new knowledge and experiences with only IDR 50.000,00.

For more information:
Email: segugmsc@gmail.com
Web: segugmsc.org
Line@: @zoj4802i
Facebook: segugmsc
Instagram: segugm

Contact Person:
Jordan Romora (089624431122)
Muhammad Sidqi (08388012468)



Internal Field Trip-Mt.Gupit

      The internal field trip of SEG UGM SC was held in Gupit, Kebonsari, Magelang at 23rd April 2016. The fieldtrip was guided by Mrs. Dian Yesy Fatimah, S.T. Fieldtrip started at 10 am until 2.30 pm. The first observation placed on Dusun Ngadiharjo. The first location was interpreted by the previous observer as high sulfidation epithermal deposits. High sulfidation epithermal deposits is result from hydrothermal fluid activity in the hipabisal depth at 1-1,5 kilometers, with low temperature that about 50-300 C.  High sulfidation epithermal deposits controlled by geological structural in this zone because, the hydrothermal fluid can move upward through the weak zone and usually the weak zone is fault. High sulfidation epithermal deposits is characterized by vuggy silica texture and clay mineral that formed in high temperature condition such as dickite, alunite, pyrofilit. The hydrothermal alteration that happened in Gupit Hill is consisting of Propilitic, Argilic, Advance Argilic and silicification alteration.

      In the first STA, we can see the Propylitic alteration that has some typical mineral, such as chlorite, epidote. In the first STA, there is a body rock that already controlled by geological structure, that is joint. The joint caused the hydrothermal fluid move upward, so the wall rock’s texture and minerals are replaced and become new minerals. In the first STA, we saw the altered rock that consist some minerals like chlorite and epidote, also oxide mineral that have black red color.


Figure 2. The outcrop of propylitic alteration

      In the second STA, about 500 meters from first STA, we met the Argilic-Advance Argilic Alteration.  In this STA, we met the altered rock that consist some composition of clay mineral group. The rock consists of alunite, dickite, and kaolin group. To determine the type of clay mineral, we should do the SEM test. The alteration in this STA didn’t look good because the strong of clay weathering.


Figure 3. Advance argilic alteration outcrop that consist of clay mineral such as dickite, alunite

      In the third STA, about 1 kilometer from second STA, we met the host rock of alteration. The host rock of high sulfidation epithermal in Gupit area mostly hornblende andesite. The host rock have already altered to propylitic alteration that characterized by chlorite and epidote, but the alteration only selective. The selective alteration happened because the distance far from source and the temperature is low. STA 4 is located about 300 meters from third STA. In fourth STA, we can see the traditional gold mining which being neglected by the miners. In this STA we found some type of altered rock.   There is lignin in this STA that belong to Nanggulan Formation. The intrusion pass the low rank coal and then the low rank coal become medium rank coal because heat transfer.  There is silicication and silicification alteration in this zone. This type of alteration made from some mineral that change into silica mineral. This alteration type was made in high temperature. In hydrothermal process, silica came from circulation fluid or leaching of host rock. The silica gel deposited in low pressure zone and fills the crack of the rock.


Figure 4. The quartz vein on STA 4, that probably consist Au element


Figure 5. Lignin that breached by intrusion

Tin Deposits in Indonesia

      Indonesia  became the second largest tin mine in the world. Most of Tin Deposit in Indonesia was produce by placer deposit. Placer deposit  is mineral deposits formed by the mechanical concentration of resistant minerals, which are released by weathering from source rocks. A mineral with a high specific gravity will become concentrated by flowing water.


Figure 1. Principal of placer deposit formation

      The only mineral of commercial importance as a source of tin is Cassiterite (SnO2). Cassiterite has been an important ore of tin for eons and is still the greatest source of tin today. Most sources of cassiterite today are not primary deposts but alluvial deposits containing weathered grains. There are three distinct types of cassiterite placers:

(1) residual eluvial concentrationson interfluves and valley side slopes;

(2) para-allochthonous placers, which directly overlythe mostly weathered country rocks of valley bottoms; and

(3) allochthonous alluvialdeposits interbedded in the sedimentary valley fill.


Figure 2. Hand specimen of cassiterite mineral as the main source of tin deposits

      Type 1 and 2 placers are directly relatedto nearby primary mineralization associated with granite intrusions, whereas type 3 depositsconsist primarily of reworked type 1 and 2 material. Most tin is used as a protective coating or as an alloy with other metals such as lead or zinc.  Tin is used in coatings for steel containers, in solders for joining pipes or electrical/electronic circuits, in bearing alloys, in glass-making, and in a wide range of tin chemical applications. Secondary, or scrap, tin is an important source of the tin supply. The potential area that consist tin in Indonesia dominantly appear on Bangka and Belitung Island which have tin from ilmenite series of granitic magma. The tin mining discovered at Sungai Liat (Bangka Island), Manggara ( Belitung Island ), Dabo (Singkep Island) and Karimun Island.


Figure 3. Tin deposits distributions in Indonesia

Official Teaser Minnovation 2016

SEG UGM-SC is presenting to you
MINNOVATION 2016: Exploration for Epithermal and Porphyry Precious Metal Systems in Java Island
Prepare yourself and be ready to be the true Hardrocker!

Minnovation 2016


The MOST awaited hard rock geology event,
MINNOVATION 2016: Exploration for Epithermal and Porphyry Precious Metal Systems in Java Island is coming to you!

Be ready to feel the heat and grab your seat!1464605343876


Unduh File Presentasi Course 1 – Facing the Challenge of Ore Minerals Exploration : Gold, Silver, and Copper (2016)

Untuk peserta course dan pengunjung website SEG UGM-SC yang ingin mengunduh file presentasi course pertama kami di tahun ini, silakan kunjungi tautan berikut: