big gossan structure and groundwater

5/22/2018 Big Gossan Structure and Groundwater

1/32www.fcx.com CONNECTING THE FUTURE

RELATIONSHIP OF BIG GOSSAN STRUCTURE AND

GROUND WATER AT BI G GOSSAN STOPING M INE

TPT XXI PERHAPI 2012

Presented By Fernandy Meiriyanto

(IVAN)


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AGENDA

Geology regional

Big Gossan geology and alteration

Stoping mine introduction

Relationship of geological structure

to ground water flow and its impactto stoping mining


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Geology Regional


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PTFI Block A Geology

GRASBERG

INTRUSIVE

ERTSBERG

INTRUSIVE

LEMBAHTEMBAGA

KUCINGLIAR

BIGGOSSAN

GRASBERGOPEN PIT

EESS

DOM

0 2000

METERS


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6

PRESPECTIVE VI EW PTF I ORE DEPOSITS

BIG GOSSAN


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7

BIG GOSSAN STRATIGRAPHY

ERTSBERG DISTRICT KUCING LIAR KUCING LIAR ORE BODY

Fm

FmKopai

Kopai Fm

Ekmai - Quartz SandstoneEkmai - QZ. SS.

Kembelangan Limestone Kembelangan LS. Potassic alterationsilica-clay alteration

Sandstone, Siltstone, Evaporites

Dolomite, Limestone,

Faumai Limestone Faumai LimestoneSirga Sandstone Sirga

Waripi : Waripi : Waripi(middle-lower)

Kembelangan

Skarn, Fe-sulfide replacement

Kais Limestone

Kais (lower)

Piniya - Shale, Siltstone

Woniwogi Fm

COW Block ABoundaryCOWBlockABoundary

TERTIAR

Y

MESOZOIC

MIOCENE

ERTSBERG DISTRICT BIG GOSSAN BIG GOSSAN

OREBODY

Skarn, Fe-sulphide

replacement

SkarnPotassic

alteration


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Big Gossan Geology and

Alteration


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BIG GOSSAN GEOLOGY LEVEL 3020

(Tw)

Hydrothermal

Breccia

Tw Tf

KkesKkel


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SKARN ORE Kkel HOSTED


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SKARN ORE Tw HOSTED


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SKARN ORE Tw Hydrothermal Breccia

HOSTED


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Stope and Fill Mine

Introduction


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Connection to AB Adits

Kasuang Adit

Paste Plant

Hoist Room

Crusher

Shops

Shaft

Exhaust Raise

Exhaust Drift

Ore Pass

Conveyor Drift

PERSPECTIVE VI EW

BIG GOSSAN STOPING M INE


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BIG GOSSAN M INING METHOD


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Relationship of geological

structure to ground water flowits impact to stoping mine,

especially during stope filling

process.


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BIG GOSSAN

PRECIPITATION

4500 MM/YEAR

RECHARGE FACTOR: 0.5

BIG GOSSAN TOPOGRAPHY


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Tw

Kkes

Kkel

BROKEN RQD 50 Gpm

Trace of Ground water (Dry)

GEOLOGIC STRUCTURE AT 3020L


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Tw

Kkel

BROKEN RQD


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BIG GOSSAN NORTH FAULT CHARACTERISTI CS


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BIG GOSSAN FAULT CHARACTERISTIC


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BIG GOSSAN CROSS FAULT I N THE DRIFT


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LEACHED ZONE


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SHEARS ZONE

KkesKkel

Kkel-KkesContact Fault

Shear 1 Structure Zone

Kkel

Kkes

1

1

2

2


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Kkel

Kkes

Sill Diorite

Shear 2 Structure

Zone

SHEAR ZONES

1 2

21


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HYDROTHERMAL BRECCIA


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Tw

Kkes

Kkel

BROKEN RQD 50 Gpm

Trace of Ground water (Dry) Ground water from surface, NoPressure, 100 Gpm

GROUNDWATER FLOW

INTERPRETATION3020L


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GROUNDWATER FLOW

INTERPRETATION 2540L

Tw

Kkel

BROKEN RQD


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TRACER TEST TRAVEL TIME RESULT 2009

Data Source From UG Hydrology Group29

STRUCTURE GEOLOGY INTERPRETATION RELATED WITH


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RQD BLOCK MODEL COMPARE TO GEOLOGY

STRUCTURE AT BIG GOSSAN (XC-18)REHEALED STRUCTURE

A. FOOT WALL

1. Overprinted by

a. Skarn Alteration

(Kkel-Kkes Contact Fault, Shear 1-2

zone)b. Hornfels Alteration

(BG Cross Fault)

2. Filled By

a. Porphyry Diorite (Te)

(Kkel-Kkes Contact Fault, Shear 1-2

zone)

B. HANGING WALL

1. Overprinted by

a. Hydrothermal Breccia

(BG Fault)

b. Skarn Alteration

(BG Fault, BGN Fault)

c. Ertsberg Diorite (Te)

(BG Fault, BGN Fault)

STRUCTURE GEOLOGY INTERPRETATION RELATED WITH

GROUND WATER

(Section Looking NW)CROSS SECTION XC 18

BROKEN RQD


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STRUCTURE GEOLOGY

HANGINGWALL STRUCTURE

1. Big Gossan North Fault

2. Big Gossan Fault

3. Big Gossan Cross Fault

FOOTWALL STRUCTURE

1. Contact Formation TwKkeh

2. Shear Zone 1 & 2

3. Contact Fault Kkel - Kkes

GROUND WATER SOURCES

HANGINGWALL WATER SOURCE1. Surface (Water Fall) and

2. Broken Zone Related Fault As

Water Pond

3. High pressure + High Volume

4. Trace test travel time 21-25 Hours

FOOTWALL WATER SOURCE

1. Surface (Water Fall)

2. No Pressure And Small Volume


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CONCLUSION AND DI SCUSSIONS

Big Gossan ground water control can divide to three (3) pattern.

Major fault structure located at hanging wall of ore body, included BG Fault and BG

North Fault with characterized by broken zone RQD


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TERIMA KASIH

SALAM DARI PAPUA

big gossan structure and groundwater

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