Asera Report 62

8/7/2019 Asera Report 62

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PT. Pertambagan Bumi Indonesia. Batam Centre Industrial Estate Block A 1.2.3 Batam Island Indonesia 29432Tel: 62-778-467596, 62-778-467597 Fax: 62-778-462501 [email protected] www.pbimining.com

Preface

This exploration report is result of exploration activity on mining concession area base on Konawe

regent permit No. 62/2007 at February 19th

, 2007 with covering 5.923 Ha. This Concession area is

located on Asera district North Konawe Regency South east Sulawesi Province.

Inside of this report is discuss about exploration activity that conducted by geologist and exploration

team of PT. Pertambangan Bumi Indonesia with 1 year duration. These activities are geological mapping,

drilling, sampling analysis, and resources evaluation.

On the end, we hope this report will useful for next plan.

Kendari, December 2008

PT. Pertambangan Bumi Indonesia


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ABSTRACT

Exploration activity is accomplished by PT. Pertambangan Bumi Indonesia and it is continuity activity for

founding out nickel deposit on concession area. This activity is base on Konawe regent permit No.

62/2007, February 19th, 2007 with covering 5.923 Ha. Located in Asera District North Konawe Regency

South East Sulawesi.

Concession area divides as 3 major blocks and 11 sub blocks. The blocks as follows:

1. Block I is located on south of concession area and divide into 6 sub blocks, with block 2, 3, 5, and6 has drilling by hand augers.

2. Block II is located on middle of concession area. This block has drilling by Jacro drilling machine.38 bore hole is accomplished with vary range of depth between 20 m to 41 m; totally depth is

932 m with 200 m grid space.

3. Block III is located on north of concession area. This block divide into 5 sub block, with block 1and block 2 has drilling by hand augers.

Concession area is administratively located on Sambandete, Paka Indah and Flora Indah Village, with

positions is 0301515,36-03

02349,54S and 122

00618,46-121

01057,38E.

Local geology is dividing into 2 major parts: South part is covering by ultramafic rock with Lasolo Rivers

as a border and North part is covering by Pandua formation and ultramafic rock on the hilly. Base on

observation fields, commonly ultramafic rock has serpentinization process excluding on middle part of

concession area.

From observation on surface and drilling record shown saprolite zone appear on around ultramafic hilly

with high at 200 m above sea level. Float quartz box work as silicification process is founded at the top

of ultramafic hilly, this is indication of fracture on dunite rock and it is suitable for nickel laterite process.


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Content

Page

Chapter I Introduction 4

1 Background 4

2 Permit 5

3 Aim and Objective 5

4 Time and Place 5

5 Tools and Exploration Equipments 6

6 General Information 6 - 7

7 Personnel 7

Chapter II Regional Geology and Characteristic of Nickel Laterite Deposit 9

Chapter III Exploration Activity 11

1 Literature study and pre-field survey 11

2 Geological mapping 11

3 Sampling grab 11

4 Sampling analysis 11

5 Mining route design 12

6 Data processing 12

Chapter IV Exploration Activity Result 13

1 Rock and Soil Sampling 13

2 Drilling 13

3 Potential 13

4 estimation Reserve 13

Chapter V Closing 22

Bibliograpy 23

- Correlation grade map- Planning map- Jacro and Hand augers drilling-

Jacro and Hand Augers Grade Table- Hand Augers Description Table- Exploration Activity Documentation- Coordinate table- North Konawe Regent Permit


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Chapter I

Introduction

I.1 Background

Term of Laterite is origin from Latin word as mean as brick earth or soil with color similar as brick.

Geology term is soil with rich of iron (Fe) and alumina (Al) on oxidation form (Lelong et al, 1976).

Laterite is residual mechanical weathering process of rich iron magnesium rock, than deposit by erosion

or none. Commonly iron magnesium rock is depiction appearance of olivine, pyroxene, amphibole, andbiotite minerals.

The weathering process is owing to climate change such as rain and humidity. The process depend on

speed of erosion, hydrology and permeability factor of rock, if speed of erosion is high than altered rock

or soil can be deposit to the low land or foot hill, but if speed of erosion low but ground water content

carbonate acid and permeable rock is high than laterite will deposits near to source rock (insitu).

Nickel laterite deposits is laterite content high of nickel (Ni) element. Not many of rock and minerals has

nickel matter, only olivine group such as Fo90 Fa10 content 0,3 % Ni and pyroxene group but such as

ortho pyroxene has 0,03 0,06 % Ni grade only. This statement shown that Dunite rock as source rock

will result much nickel content if it alterated.

Serpentine mineral is olivine mineral alterated by process hydration and oxidation. Serpentine rock has

iron and nickel is namely garnerite, with chemical process as follows:

2Mg2SiO4 + 4H + 0,5O2Mg3SiO5(OH)4+Mg-2(aq)

Olivine Serpentine


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I.2 Permit

Concession area is located in Asera District North Konawe Regency with covering 5.923 Ha, this base on

Konawe Regent Permit No. 62/2007, expire for 3 (three) years, start on February 19, 2007 until February

19, 2010.

I.3 Aim and Objective

This activity aim is to known nickel laterite scattering potential and deposit in concession area. It is

purpose for zoning of prospected area and data for next stage of mining planning.

I.4 Time and Place

This activity is conducted at Q1 and Q2 on 2008. It taking place on Asera District. Collection data is result

from drilling, pit test, rotary drilling (Jacro), rock sampling and Soil sampling.

Picture 1. Exploration survey location


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Location of survey area can be reach by vehicle from Kendari city to Asera district North Konawe

Regency, approximately 4 hours.

I.5 Tools and Exploration equipment

Tools and equipments are use in this activity as follows

1. Geology Hammer.2. Brunton Compass.3. Sunton Compass.4. Garmin Global Positioning System (GPS).5. Digital camera.6. Altimeter.7. Nitton x-ray.8. 50 M roll mater.9. Plastic sampling bag.10.Stationery.11.Field note.12.

Topography map scale 1:50.000.

13.Hand augers.14.Rotary drilling (Jacro).

I.6 General Information

I.6.1 General Condition of study area

Concession area is located in Asera District North Konawe Regency with covering 5.923 Ha, it is occupied

by Protected forest 335 Ha, Production forest 2.805 Ha, Conversion Production forest 2.200 Ha, and

Transmigration 563 Ha.


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The tribe in this area are composite of Bugisness, Tolaki, Mekongga, and a little from Javanese and

Baliness. The economics of local peoples are majorly farmers, a few of government officer, and

entrepreneurs. The religions are majorly Islam and a few of Christian and Hindu.

I.6.1 Basic data

This study is use some of basic data as reference such as Indonesia Land Form Map Scale 1 : 50.000

issued by BAKOSURTANAL, South East Sulawesi Forestry map Scale 1: 50.000 issued by South East

Sulawesi Forestry Service and Geology and Mining Potential Map Scale 1 : 630.000 issued by South East

Sulawesi Mining and Energy Service.

I.7 Personnel

No. Job Group Name Job Description Others

1 2 3 4 5

1 Management 1. Tjong Hon Khong2. Hendri3. Junianto

1. President Director2. Branch Manager3. Operation Head

2 Expert 1. Lediyantje Lintjewas, ST

2. Umar Iribaram, ST

3. Abram Padaunan, ST

4. Yunus Faidiban, ST5. Muh. Kasim, ST6. Anwar

1. Geologist2. Geologist3. Geologist4. Geologist5. Geologist6. Geologist

3 Surveyor 1. Sutarno2. Yan Gustaf3. Kameluddin4. Muh. Basri5.

Darwis Koko

6. Ansar7. Lajoni8. Feri9. Rayon10.Asep Sujator P.11.Nurdin

1. Operator2. Operator3. Operator4. Operator5.

Helper

6. Helper7. Helper8. Helper9. Assistant Geologist10.Assistant Geologist11.Assistant Geologist


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12.Suwartoyo 12.Assistant Geologist4 Maintenance 1. Samson

2. A. Riady1. Maintenance2. Maintenance

5 Sampling

handler

1. Suardi2. Rudy

1. Keeper2. Keeper

6 Administration 1. Ramli Jaya, SH2. Susanty3. Lisa Febrianty4. Udin SE5. Felix

1. HRD2. Finance3. Accounting4. HRD Staff5. HRD Staff

7 Security 1. Abdul Azis2. Abdul Kadir3. Abdul Hamid4. Haerul

1. Security2. Security3. Security4. Security

8 Logistic 1. Susanty2. Paddah

1. Staff2. Staff


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Chapter II

Geology Regional and Characteristic Nickel Laterite Deposit

II.1 Geology Regional

Concession area of PT. Pertambangan Bumi Indonesia is located at Asera district, It is North Ultramafic

block that geologically separated from their main Ultramafic Block namely Hialu Ultramafic Block

Province. Lasolo Rivers is interpretation as boarder; it is thrust fault that linked to Landawe Rivers on

south that turn to east. This fact is explanation of variation of rock associated on study area. Hilo

Ultramafic Block is ofiolite and arrangement of peridotit, harzburgit, dunit and serpentinit.

Three distinctly different geology provinces are recognized in Sulawesi Island. They are west and east

Sulawesi, which are divided by the north-trending fault zone at about 120025 east longitude, and third,

the Baggai Islands, Sula Islands, and Buton Islands. The Study area is located on East Sulawesi geology

province.

East Sulawesi province consists largely of basic and ultrabasic igneous rocks as known as ultramafic

complex and associated schistose metamorphic rock. The western part consists predominantly of schist

in with gaucophane increase in abundance westward to the boundary with west Sulawesi province.

Basic and ultrabasic rocks cover large areas in the eastern part of east arm as namely Hialu Trending

Ultramafic block. It is Cretaceous Ultramafic complex consist peridotit, harzburgit, dunit and serpentinit.

Mesozoic deep water carbonate and clastics associated with radiolarian cherts occur in the province.

Paleogene rocks are restricted to the northeastern part, but neogene rocks are much more widespread

in the province and form the Celebes Molasse.

Most contact between metamorphic rocks, ultramafic rocks, and Mesozoic sedimentary rocks are fault

contacts. The ultramafic rocks have been thrust over Eocene to middle Miocene carbonates in the

northeastern part.


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II.2 Geology of Study Area

Geology of study area can divided in 2 parts. First part is ultramafic complex in southern part of study

area and second part is Pandua formation and a little ultramafic part in northern part. Pandua formation

is laying on ultramafic rock, and covering plain and low land near Lasolo Rivers.

Field observation is found that ultramafic rock is commonly serpentinization except on middle part.

Drilling and outcrops data is shown of saprolitic zone at hilly with high at 200 m above sea level. Float

quartz box work as silicification process is founded at the top of ultramafic hilly, this is indication of

fracture on dunite rock and it is suitable for nickel laterite process.

II.3 Characteristic Nickel Laterit Deposit on Concession Area

Drilling and outcrops data are shown that nickel laterite deposit at study area can divided into 3 groups,

as follows:

1. Nickel laterite deposit resulted from dunit alteration.2. Nickel laterite deposit resulted from peridotit alteration.3. Nickel laterite deposit resulted from dunit float rock alteration.

Cause of 3 groups above than make different laterite layer include of their saprolitic zone. Laterite

comes from peridotit alteration is very common in study area.

Limonite layer is found with iron oxides nodul, it is widespread around Paka Indah Village, Drilling record

is shown after 20 m under limonite layer is sandstone and conglomerate from Pandua Formation laying.

This is interpretation that Pandua formation is the basement of Paka Indah valley and Hilly has

arrangement from ultramafic rock that weathering and erosion going down to Paka Indah valley and

deposit there.


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Chapter III

Exploration Activity

III.1 Literature Study and Field Planning

Literature study is conduct to get of early information about situation of study area such how to reach

study area, social economic on study area, geology, and nickel laterite deposit potential.

Field planning is done for design of survey such as schedule survey, budgeting, person and material for

supporting so exploration activity can run smoothly.

III.2 Geology Mapping

Geology mapping is carrying out to known of morphology, variation and distribute of lithology,

mineralization, wide of concession area, prospecting area and others aspect. Mapping method is used

in this study is surface mapping, geology measured, and kinematic tracking GPS. Tools and equipments

are used such as working map scale 1: 12.500, geology hammer, geology compass, GPS, camera, plastic

sampling and others.

III.3 Sampling grab.

Amount of sampling that carry out for analysis as follows;

No. Sample Amount (bag)

1

2

3

4

5

Pit test

Rotary drilling (Jacro)

Hand augers

Channel sampling

Soil sampling

-

38

243

27

6


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III.4 Sampling Analysis

Chemical analysis method is using for known percentage of Ni, Fe, SiO2, CaO and MgO on sample. This

analysis is done at PT. Pertambangan Bumi Indonesia Laboratory with X-Ray Analysis.

III.5 Mining route planning

Mining route survey is conduct to know how of carrying of nickel ore after digging out. This method is

trace of potential access such as waterway or land route. The result of this activity as follows:

1. Rivers route :Concession area has potential waterway such as Lalindu River, wide of Lalindu river about 50

300 m, depth 5 10 m, length to open sea about 32 Km, current river is 1,48 m/s 2,42 m/s.

2. Land route :Concession area has main road that can be useful to carrying out material to open sea.

Concession area is near coastal line that is others advantage.

III.5 Data Processing

Data processing is conduct at PT. Pertambangan Bumi Indonesia Office in Kendari. Data form is dividing

as 2 group as follows; 1. Drilling record, and 2. Analysis sampling record. Both data is storage with

confidential and safety by using restricted procedure. Drilling record and laboratory record will put in

computer for further analysis and core drilling and rock sampling will put in storage.


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Chapter IV

Exploration Activity Result

IV.1 Rock and Soil Sampling

This activity is done with geology mapping. This activity is conduct to know spread of source rock and

trend of laterite in concession area.

Rock sampling is done at outcrop of fresh ultramafic rock and soil sampling is done at red soil

appearance. Channel sampling is 27 points and soil sampling is 6 points.

IV.2 Drilling

Drilling is conduct after geology mapping. There are 2 drilling methods as hand augers and rotary drilling

(jacro). Hand augers is use if in the concession area is found laterite zone and rotary drilling is use after

hand augers result shown positive prospect.

This activity is done by 243 hand auger bore hole and 38 rotary drilling bore hole. Depth is varying

between 6 to 10 m for hand auger and 20 to 41 m for rotary drilling. Total depth approximately 932 m.

Locations drilling are spread as 59 points in northern part of concession area, 44 points in southern of

concession area, and 140 points in middle of concession area.

IV. Potential

Extensive laterite deposits drived from ultramafic rock contain potential of nickel laterite deposit in

concession area. The iron capping is normally restricted to exceptionally flat plain area. The ultramafic

rock is also containing chromite and some manganese. Ni content is vary between 0,98 to 2,29%Wt, Fe

content between 13,20 to 54,36%wt, and high of Cr and a few of Mn.

IV. Estimation Reserve

Concession area is Nickel laterite deposit from data interpretation as 92.376.000 Ton with 0,98 to 2,1%

Ni.


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Chapter VI

Closing

1. Source rock of nickel laterite in concession area is dominated of serpentinite rock fromultramafic rock groups.

2. Bore drilling core result that saprolite zone is appeareance at 2 to 6 meter with avarage thick 4m at morphology hilly with 25 100 m above sea level and 2 to 12 m with avarage thick 10 m at

steeply hills.

3. 243 hand augers bore result that laterite zone thick 6 to 10 m.4. Concession area is Nickel laterite deposit from data interpretation as 92.376.000 Ton with 0,98

to 2,1% Ni.


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Bibliography

Bammelen, 1949, The Geology of Indonesia , martinus Nijhoff The Hague.

Sabarna, 2006 Laporan Penyelidikan Umum Pada Daerah Asera Kabupaten Konawe Utara Provinsi

Sulawesi Tenggara. PT. Pertambangan Bumi Indonesia.

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