MINERAL RESOURCE ASSESSMENT OF PORPHYRY COPPER DEPOSITS IN INDONESIA USING THE USGS 3-PART ASSESSMENT METHOD

Convention Bandung 2004 (CB2004)
The 33rd Annual Convention & Exhibition 2004

Indonesian Association of Geologist
Horizon Hotel, 29-30 Nov, 1 Dec 2004, Bandung

MINERAL RESOURCE ASSESSMENT OF
PORPHYRY COPPER DEPOSITS IN INDONESIA
USING THE USGS 3-PART ASSESSMENT
METHOD

Bambang Tjahjono Setiabudi

Directorate of Mineral Resources Inventory
E-mail: BTSetiabudi@hotmail.com

ABSTRACT

Mineral Resource Assessment is a field of research and application of
quantitative appraisal methods to evaluate potential mineral resources.
Principally it describes mineral deposits, measures their grade and tonnage,
estimate the occurrence of the undiscovered deposits and estimates mineral
resources in the permissive tracts. The main objectives are to outline the
principal areas in Indonesia that have potential for selected undiscovered
mineral resources and to estimate the probable amounts of those mineral
resources to a depth of 1 km below the earth's surface. The assessment is
carried out using the USGS 3-Part Quantitative Mineral Resource Assessment
Method. The 3-part method consists of firstly, delineating tracts for commodities
and porphyry Cu deposit types based on the geology of the ore deposits,
secondly, estimating the amount of resources contained in the undiscovered
deposits using appropriate ore characteristics and metal contents based on
grade and tonnage models and thirdly, estimating number of undiscovered
deposits of each type for each delineated area. Overview of porphyry copper
resources in Indonesia as the results of mineral assessment includes
standardized database for known mineral deposits and occurrences, digital
regional-scale maps of tracts permissive for current known deposits as well as
undiscovered mineral resources, and estimates of undiscovered mineral
resources within permissive tracts for copper (copper-gold).

SARI

Penilaian Sumber Daya Mineral adalah suatu bidang penelitian dan aplikasi
metode kuantitatif untuk mengevaluasi potensi sumber daya mineral. Metoda ini
menjelaskan endapan mineral, menentukan kadar dan tonase, memperkirakan
keterdapatan endapan yang belum ditemukan dan memperkirakan jumlah
sumber daya mineral di daerah tersebut. Tujuan utamanya adalah untuk
menentukan daerah-daerah utama di Indonesia yang memiliki potensi sumber
daya mineral tertentu yang belum ditemukan dan untuk memperkirakan jumlah
sumber daya mineral tersebut sampai batas kedalaman 1 km dibawah
permukaan bumi. Penilaian ini menggunakan USGS 3-Part Quantitative Mineral
Resource Assessment Method. Metoda ini terdiri atas 3 bagian, yaitu (1)
menentukan tract untuk komoditas dan endapan tembaga porfiri berdasarkan
geologi endapan bijih, (2) memperkirakan jumlah sumber daya yang terkandung
dalam jenis endapan yang belum ditemukan dengan menggunakan karakteristik
endapan dan kandungan logam berdasarkan model kadar dan tonase, dan (3)
memperkirakan jumlah endapan yang belum ditemukan untuk setiap jenis di
daerah yang telah ditentukan. Pengkajian sumber daya tembaga porfiri di
Indonesia sebagai hasil penilaian sumber daya mineral ini meliputi database
standard untuk endapan mineral yang prospek maupun yang berupa indikasi,
peta digital regional dan tabel data daerah (tract) untuk endapan yang prospek
maupun yang belum ditemukan, estimasi sumber daya mineral yang belum
ditemukan dalam suatu tract untuk endapan tembaga (tembaga-emas).

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ORGANIC PETROLOGY OF SELECTED TERTIARY KALIMANTAN COALS

Convention Bandung 2004 (CB2004)
The 33Convention Bandung 2004 (CB2004)
The 33AnnualConvention & Exhibition 2004

Indonesian Association ofGeologist
Horizon Hotel, 29-30 Nov, 1 Oct 2004, Bandung

ORGANIC PETROLOGY OF SELECTED TERTIARY
KALIMANTAN COALS

By :

Binarko Santoso and Bukin Daulay

R and D Centre for Mineral and Coal TechnologyJalan Jenderal Sudirman 623 Bandung 40211Ph. 022-6030483, fax. 022-6003373, email binarkos@tekmira.esdm.go.id

ABSTRACT

Study on organic petrology was carried out on both East and South Kalimantan Palaeogene andNeogene coals. West and Central Kalimantan coals are ignored in the study, because their
geological conditions are not favourable and the seams are usually thin and generally rich inargillaceous or arenaceous mineral matter.

Similarities and differences in type and rank characteristics in the coals reflect their geologicalsetting. Rank and type variation of the coals were assessed by petrographic examination of 40samples. The coals are dominated by vitrinite, common exinite and rare inertinite and mineralmatter. The type differences reflect climatic influence and differences in peat conditions.

Rank of the coals depends largely on the geological age and the level of temperature under
confining pressure (burial depth). Increased depth of burial and increased temperature andpressure over a period of time, consequently result in higher rank. Reflectance measurements on
the coals indicate that there is a substantial difference in rank between Palaeogene and Neogenecoals. The Palaeogene coals are sub-bituminous to high volatile bituminous rank (Rvmax of 0.53-
0.67%), whereas Neogene coals are brown to sub-bituminous rank (Rvmax of 0.30-0.57%),
according to the Australian classification.

SARI

Studi petrologi organik telah dilakukan terhadap batubara Paleogen dan Neogen diKalimantanTimur dan Selatan. Batubara Kalimantan Barat dan Tengah tidak termasuk dalam studi ini, sebabtatanan geologisnya kurang menarik dan lapisan-lapisan batubaranya umumnya tipis dan banyak
mengandung mineral berpartikel lempung dan pasir.

Kesamaan dan perbedaan karakteristik jenis dan peringkat batubara di daerah penelitian
mencerminkan tatanan geologisnya. Variasi jenis dan peringkat batubara tersebut diteliti di bawahpengujian petrografis terhadap 40 buah contoh. Batubara Kalimantan didominasi olehvitrinit,
eksinit dan sedikit inertinit dan mineral. Perbedaan jenis batubara tersebut mencerminkanpengaruh cuaca dan perbedaan lingkungan pembentukan gambutnya.

Peringkat batubara Kalimantan terkontrol oleh umur geologis, suhu dan ketebalan lapisanpenutupnya. Semakin tebal lapisan penutup, suhu dan tekanan pada suatu periode waktu tertentu,
menghasilkan peringkat yang lebih tinggi. Pengukuran reflektansi vitrinitnya menunjukkanperbedaan penting peringkat antara batubara Paleogen dan Neogen. Batubara Paleogen tersebutberperingkat subbituminus-bituminus zat terbang tinggi (Rvmax 0.53-0.67%), sedangkan batubaraNeogennya adalahbatubara coklat-subbituminus (Rvmax 0.30-0.57%), berdasarkan klasifikasiAustralia.

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MINERAL RESOURCE ASSESSMENT OF PORPHYRY COPPER DEPOSITS IN INDONESIA USING THE USGS 3-PART ASSESSMENT METHOD

 

Bambang Tjahjono Setiabudi

Directorate of Mineral Resources Inventory

E-mail: BTSetiabudi@hotmail.com

 

ABSTRACT

Mineral Resource Assessment is a field of research and application of quantitative appraisal methods to evaluate potential mineral resources. Principally it describes mineral deposits, measures their grade and tonnage, estimate the occurrence of the undiscovered deposits and estimates mineral resources in the permissive tracts. The main objectives are to outline the principal areas in Indonesia that have potential for selected undiscovered mineral resources and to estimate the probable amounts of those mineral resources to a depth of 1 km below the earth's surface. The assessment is carried out using the USGS 3-Part Quantitative Mineral Resource Assessment Method. The 3-part method consists of firstly, delineating tracts for commodities and porphyry Cu deposit types based on the geology of the ore deposits, secondly, estimating the amount of resources contained in the undiscovered deposits using appropriate ore characteristics and metal contents based on grade and tonnage models and thirdly, estimating number of undiscovered deposits of each type for each delineated area. Overview of porphyry copper resources in Indonesia as the results of mineral assessment includes standardized database for known mineral deposits and occurrences, digital regional-scale maps of tracts permissive for current known deposits as well as undiscovered mineral resources, and estimates of undiscovered mineral resources within permissive tracts for copper (copper-gold).

SARI

Penilaian Sumber Daya Mineral adalah suatu bidang penelitian dan aplikasi metode kuantitatif untuk mengevaluasi potensi sumber daya mineral. Metoda ini menjelaskan endapan mineral, menentukan kadar dan tonase, memperkirakan keterdapatan endapan yang belum ditemukan dan memperkirakan jumlah sumber daya mineral di daerah tersebut. Tujuan utamanya adalah untuk menentukan daerah-daerah utama di Indonesia yang memiliki potensi sumber daya mineral tertentu yang belum ditemukan dan untuk memperkirakan jumlah sumber daya mineral tersebut sampai batas kedalaman 1 km dibawah permukaan bumi. Penilaian ini menggunakan USGS 3-Part Quantitative Mineral Resource Assessment Method. Metoda ini terdiri atas 3 bagian, yaitu (1) menentukan tract untuk komoditas dan endapan tembaga porfiri berdasarkan geologi endapan bijih, (2) memperkirakan jumlah sumber daya yang terkandung dalam jenis endapan yang belum ditemukan dengan menggunakan karakteristik endapan dan kandungan logam berdasarkan model kadar dan tonase, dan (3) memperkirakan jumlah endapan yang belum ditemukan untuk setiap jenis di daerah yang telah ditentukan. Pengkajian sumber daya tembaga porfiri di Indonesia sebagai hasil penilaian sumber daya mineral ini meliputi database standard untuk endapan mineral yang prospek maupun yang berupa indikasi, peta digital regional dan tabel data daerah (tract) untuk endapan yang prospek maupun yang belum ditemukan, estimasi sumber daya mineral yang belum ditemukan dalam suatu tract untuk endapan tembaga (tembaga-emas).

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TUNGSTEN AND GOLD MINERALIZATION IN THE LATUPA AREA, LUWU DISTRICT, SOUTH SULAWESI

 

Bambang Nugroho Widi* ), Sudarsono**)

*) Direktorat Inventarisasi Sumber Daya Mineral, Bandung

**)Puslitabang Geo-Teknologi LIPI, Bandung

 

Abstract

Tungsten mineralization occurrences in the Suguntu area, Latupa form an unique mineralization to study, particularly in the Indonesia Archipelago geological setting. It is usually occurred commonly in the continental or cratonic environment granitic rock. The presence of gold and a number of other sulfide- oxide minerals such as arsenopyrite, chalcopyrite and mangan as mineral association make the mineralization become more interesting and important in this region. Mineralization in this area is indicated by the presence of tungsten mineral (wolframite) bearing quartz vein intruding the granitic and metasediment host rocks. The vein trend is generally of about N 170 ° E to 190° with dip of about 70° to 90° with thickness from few centimeters to nearly 20 centimeters. Altered rocks type present in this area involve argilitization, propylitization, seritization (phyllic). Silicification found locally, particularly near to the vein. Based on the physical appearrence on the specimens, minerals association recognized are cahalcopyrite, pyrite, magnetite, hematiti and mangan. It seem mineralization formed in the mesothermal environment, at depth lower than epithermal zone (more than 500 meters below the paleosurface) with temperature formation > 300°. However, in order to ensure this suggestion, study on geochemistry, ore microscopy, fluid inclusion, petrography, pima, etc, are hughly needed to obtain an imaginationclearly in connection to know the relationship between tungsten (wolfram) and gold mineralization.

 

Sari

Keterdapatan mineralisasi tungsten di daerah Siguntu, Latupa merupakan bentuk mineralisasi yang unik untuk di pelajari khususnya pada tatanan geologi kepulauan di Indonesia. Hal ini biasa terjadi umumnya pada lingkungan kontinen atau batuan bersifat granitik. Kehadiran mineral emas dan mineral sulfida serta oksida lainnya seperti arsenopirit, kalkopirit , magnetit dan mangan menjadikan mineralisasi ini lebih menarik dan penting di kawasan ini. Mineralisasi di kawasa ini ditandai oleh hadirnya urat kuarsa mengandung mineral tungsten (wolframit) yang menerobos batuan metasedimen dan batuan granit. Pada umumnya arah urat adalah hampir uatara selatan (N 170 – 190°) dengan kemiringan antara 70 ~ 90° dan ketebalan urat dari beberapa sentimeter hingga mendekati 20 sentimeter. Batuan alterasi yang muncul adalah argilitisasi, propilitisasi, seritisasi dan setempat silisifikasi terutama dekat urat. Berdasarkan kenampakan fisik yang dikenal pada hand spesimen mineral assosiasinya adalah arsenopirit, wolframit, kalkopirit, pirit dan mangan. Agaknya mineralisasi terbentuk pada lingkungan mesotermal dengan kedalaman yang lebih dalam dari zona epitermal (lebih dari 500 m di bawah permukaan dengan temperatur pembentukan > 300°) Untuk memastikan dugaan ini studi geokimia, mikroskop bijih, petrografi, inklusi fluida, PIMA dan lain sebagianya sangat diperlukan guna mendapatkan gambaran secara lebih jelas dalam kaitannya untukmengetahui hubungan antara mineralisasi tungsten dan emas.

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LATERAL CONTINUITY PREDICTION OF LATERITE NICKEL DEPOSIT BETWEEN TWO DRILL BY USING GEOLOGICAL AND STATISTICAL APPROACH AT SOROWAKO AREA SOUTH SULAWESI PROVINCE

Asran Ilyas, Adi Tonggiroh, Agustinus T*

Geological Engineering, Hasanuddin University, Makassar, South Sulawesi, INDONESIA

asran_ilyas@yahoo.com, adi_unhas@yahoo.com

ABSTRACT

On mining process in the ore zone of laterite nickel deposit in Sorowako area then needed the prediction of the deposit in lateral continuity in underground. This prediction is very important in order to create the section of lateral continuity of laterite nickel deposit in underground between the nearest of two drill points in order to get the mining process effectively and efficiently. One of the prediction technique that could be develope is by using the minerals content series from top to bottom from the outcome of the logging data's between the nearest of two drill points by using geological and statistical approach. From the outcome of the prediction, it is get that this prediction technique is good enough and could be applied and developed for the mining process needed and developing of science and technology in the future.

Keywords : prediction, minerals content series, geological and statistical approach.

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HYDRAULIC CONDUCTIVITY BEHAVIORAL DEVELOPMENT ON ARTIFICIAL VEGETATION SUBSTRATES (made by coal fly ash, gravel G5 and clay) FOR THE COAL MINING RECLAMATION PROJECT „OBERDORF“ GKB-Bergbau GmbHKÖFLACH AUSTRIA

 

by :

 

Anggoro Tri Mursito

 

Research Centre for Geotechnology

Indonesian Institute of Sciences (LIPI)

Jl. Sangkuriang, Komplek LIPI Gedung 70, Bandung 40135

anggoro@geotek.lipi.go.id

 

abstract

 

An artificial soil mixed made out of electrical-coal power plant wastes (fly ash) and

material from the coal mine sites (clay and gravel G5) has been created for the

reclamation of open pit mine site. Physico-chemical properties were measured over

time to examine them in a chronosequence of 22 plots (each 400m2) with

systematically changing mixtures (1,2 and 3 components of varying proportions were

established and planted. In the field plots, available nutrient content was initially high

but established only for some of plots. Due to ecological function measurement,

physical parameter, which is hydraulic conductivity, is one of several physic

properties will have to be monitored and analysed.

 

According to the development value of the year of 2003 (spring) shows that

increasing of water permeability classes (class 6) is leaning to the direction of fly ash

and tegel (clay) composition. Class 5 are only in the trial plot number 5 and 9. Only in

one trial plot which is drop in class 4 (trial plot 16), but it is still classified into "good"

class (according to "Arbeitskreis Standortskartierung, 1996"). The trial plot number 1

has also classified into class 6, because the substrate composition in this trial is only

100% of gravel. It has to be the highest class, but it is not always the highest value of

water permeability. All the trial plots are classified into high to very-very high.

Compared results between initial (spring, 2000) and recent measurement (spring,

2003) is shown that extremely increased in the trial plot 3 and 13. In the year of 2003,

in trial plot number 3 and 13 are suddently flare up to 4 classes (from class 2 to 6).

As also analysed by Computed Tomography images of one component substrate

(100 % of tegel) shows that cracked structures clearly appear as a results of

decreasing precipitation in the last winter and also highly increasing of temperature

as well. High percentage of cracked means that water can easily flows. Most of the

trial plots are increasing of classes due to the season differences. The others (trial

plot number 1, 5, 6 and 9) remain in the same class.

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