BARRAMBIE MINE DEWATERING INVESTIGATION · Eleven drilling locations were identified for the mine dewatering investigation: seven holes in the south pit area, two holes outside of

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BARRAMBIE MINE DEWATERING INVESTIGATION

Document Status

Revision Date Revision Description

A 06/10/2008 Unreviewed Draft

B 16/10/2008 Final

Name Position Signature Date

Originator: Kate Holder Senior Hydrogeologist 16/10/2008

Reviewer: Greg Sheppard Principal Hydrogeologist 16/10/2008

Aquaterra Consulting Pty Ltd ABN 49 082 286 708

Suite 4, 125 Melville Parade Como, Western Australia, 6152

Tel: (08) 9368 4044 Fax: (08) 9368 4055

EXECUTIVE SUMMARY Reed Resources Ltd (Reed Resources) are currently undertaking Definitive Feasibility Studies into the

development of a vanadium / titanium mine in the Barrambie area, located 80km northwest of Sandstone and

115km southeast of Meekatharra in the Murchison Region of Western Australia. The Barrambie deposit

consists of a north pit and south pit. Comprehensive mineral resource investigations have been conducted

at the south pit, whilst mineral resource investigations have only recently commenced at the north pit area.

Both the south and north pits are proposed to be mined to 460mRL, some 25-30m below the local water

table.

A number of holes have been drilled in the Barrambie deposit area for mineral exploration purposes. A

review of available data from these exploration holes suggests that the geology in the mine area is relatively

low yielding, with water inflows intercepted at the base of the weathering profile and fracture zones. Airlift

tests could not be conducted on the existing drill holes because the majority of the holes were unstable and

collapsed over time due to the high clay content.

Eleven drilling locations were identified for the mine dewatering investigation: seven holes in the south pit

area, two holes outside of the south pit area and two holes in the north pit area. Drilling of the eleven holes

commenced on 5th August 2008. Following completion of the drilling programme, airlift tests were attempted

at each open drill hole to obtain an estimate of aquifer yields. Bores BWB01, BWB02, BWB04, BWB05 and

BWB11 were dry at completion of drilling, therefore airlift tests were not conducted. Airlift tests on bores

BWB03, BWB06, BWB07, BWB08, BWB09 and BWB10 returned insignificant flows and went dry within a

few minutes, therefore the tests were terminated and the rate of water level recovery was recorded for up to

20 minutes.

In order to obtain estimates on aquifer permeability, the water level recovery data was analysed using

standard graphical techniques for rising head tests. Estimated permeabilities range from 0.1m/d to 0.95m/d,

with an average permeability of 0.4m/d applied for the Barrambie mine area.

Analytical modelling was undertaken to predict groundwater inflows to the Barrambie mine over the period of

the mining operation. The analytical modelling included using a lumped parameter analytical groundwater

flow model based on the Dupuit-Forchheimer equation for flow to a large diameter well in an unconfined

aquifer.

The results of the analytical modelling suggest that groundwater inflow into each of the proposed pits will

range from around 950kL/d (11L/s) at the first stage of mining, increasing to around 2,400kL/d (28L/s) toward

the end of mining. This approach used analytical, lumped parameter models and the predictions can only be

considered to represent average conditions. That is, there may be higher inflows around larger fracture

networks or where higher permeability horizons exist. Sensitivity analyses were conducted in order to

estimate “worst case” inflows at such zones.

Under base case conditions and applying average annual rates for rainfall and evaporation, simple analytical

modelling predicts that pit lake levels will reach equilibrium at approximately 475mRL (i.e. approximately 15m

above the pit floor and approximately 15m below the pre-mining water level). The model predicts that it will

F:\Jobs\767\B9-B11\600\209b.doc ES-1

EXECUTIVE SUMMARY take approximately 5 years for the pit water level to recover to 475mRL. As long-term pit water levels will

remain below pre-mining and regional water levels, the Barrambie pits will act as a groundwater sink, with

groundwater flow directions toward the pit, and evaporative losses being the only outflow of water from the

system.

Given the nature of the aquifer system (low permeability, fractured rock) it will not be practical to develop a

viable or cost effective advanced dewatering system using perimeter dewatering bores. It is recommended

that mine dewatering be achieved through the use of in-pit sump pumping.

F:\Jobs\767\B9-B11\600\209b.doc ES-2

TABLE OF CONTENTS

F:\Jobs\767\B9-B11\600\209b.doc i

EXECUTIVE SUMMARY..............................................................................................................................ES-1

SECTION 1 - INTRODUCTION....................................................................................................................1

SECTION 2 - PHYSICAL SETTING.............................................................................................................2 2.1 Climate..................................................................................................................................................................... 2 2.2 Geology and Hydrogeology ..................................................................................................................................... 2

2.2.1 Geology....................................................................................................................................................... 2 2.2.2 Hydrogeology .............................................................................................................................................. 2

SECTION 3 - FIELD INVESTIGATIONS......................................................................................................4 3.1 Drilling Results ......................................................................................................................................................... 4 3.2 Hydraulic Testing ..................................................................................................................................................... 4

SECTION 4 - MINE DEWATERING REQUIREMENTS...............................................................................6 4.1 Mine Inflow Assessments ........................................................................................................................................ 6 4.2 Final Pit Void Assessment ....................................................................................................................................... 7 4.3 Impacts of Mine Dewatering .................................................................................................................................... 7

SECTION 5 - CONCLUSIONS & RECOMMENDATIONS ..........................................................................8 5.1 Conclusions ............................................................................................................................................................. 8 5.2 Recommendations ................................................................................................................................................... 8

SECTION 6 - REFERENCE LIST ................................................................................................................9

TABLES

Table 1 Summary of Mine Monitoring Bores.............................................................................................................. 4 Table 2 Summary of Rising Head Test Analysis........................................................................................................ 5 Table 3 Summary of Predicted Pit Inflows................................................................................................................. 6

FIGURES

Figure 1 Barrambie Mine Location Plan Figure 2 Barrambie Geology Plan Figure 3 Monitoring Bore Location Plan Figure 4 Barrambie South Pit – Mine Stages

APPENDICES

Appendix A Barrambie Mine Borelogs Appendix B Rising Head Test Data & Analysis

F:\Jobs\767\B9-B11\600\209b.doc Page 1

SECTION 1 - INTRODUCTION

Reed Resources Ltd (Reed Resources) are currently undertaking Definitive Feasibility Studies into the

development of a vanadium / titanium mine in the Barrambie area, located 80km northwest of Sandstone and

115km southeast of Meekatharra in the Murchison Region of Western Australia (Figure 1).

Reed Resources plan to mine approximately 3Mt of vanadium ore annually over an initial mine life of 12

years. The Barrambie deposit consists of a north pit and south pit. Comprehensive mineral resource

investigations have been conducted at the south pit, whilst mineral resource investigations have only recently

commenced at the north pit area. Both the south and north pits are proposed to be mined to 460mRL, some

25-30m below the local water table.

The objective of this report is to provide an assessment of pit inflows and mine dewatering requirements for

the Barrambie mine. This report includes:

• A description and outcomes of hydrogeological investigations.

• Prediction of pit inflows and assessment of dewatering options.


SECTION 2 - PHYSICAL SETTING

2.1 CLIMATE

The Murchison region experiences arid climate conditions with dry, hot summers and mild winters. Mean

maximum daily temperatures average between 19°C in July to 38°C in January. The long-term annual

average rainfall for Meekatharra during the 62 year period between 1944 and 2007 was 235.4mm.

Evaporation rates are high, typically over 200mm/month. Rainfall across the Murchison is highly variable

and is largely driven by cyclonic events and localised thunderstorms during the summer months.

2.2 GEOLOGY AND HYDROGEOLOGY

2.2.1 Geology

Barrambie lies within the Murchison Province, which is the westernmost of three granite-greenstone terranes

in the Archaean Yilgarn Craton. The underlying and surrounding bedrock comprises metamorphosed

sedimentary and igneous rock intruded by granite. Tertiary weathering has formed a lateritic profile over the

Archaean bedrock. The lateritic profile overlying granitic rocks typically consists of leached or kaolinitic rocks

overlain by a thin ferruginous cap. Metabasic and metasedimentary rocks are overlain by pisolitic laterite

over a reddish-brown mottled zone. The Proterozoic basement outcrops extensively in the area, but is

overlain in places by relatively thin Tertiary and Quaternary deposits which are associated with both current

and palaeo-drainages. Areas of calcrete are exposed in depressions between drainage divides and

drainage channels. The geology of the region is illustrated in Figure 2.

Barrambie is predominantly underlain by a heavily weathered, differentiated gabbro. Within this host

intrusion there exist several sub-vertical bands of magnetite rich mineralisation which are rich in vanadium

and titanium oxides.

2.2.2 Hydrogeology

The granitoids rocks consist of even-grained to porphyritic granite and adamellite, and are laterised and

deeply weathered up to approximately 30m thick. Groundwater can generally be sourced from the base of

the weathering profile, although open joints and fractures are known within the upper 5-10m of the fresh

bedrock (Department of Water, 2006).

The greenstone rocks comprise mafic and ultramafic volcanics, felsic volcanics, volcaniclastics and

metasedimentary rocks, including cherts and banded-iron formation. They occur in mainly north-south

trending belts throughout the area, and the project area is located on the Barrambie Greenstone Belt. These

rocks have a deep weathering profile which consists of dense clay, except over ultramafics which are capped

by vuggy silcrete. Small groundwater supplies are generally obtained from near the base of the weathered

zone and in the underlying fractured rocks (Department of Water, 2006).

Regional aquifers in the Murchison Province include fractured rock aquifers in the basement rock, karstic

features in calcrete and alluvial and palaeochannel aquifers. Groundwater flow systems in the area are

maintained by rainfall recharge, which is difficult to estimate due to high evaporation rates and plant

transpiration.

PHYSICAL SETTING


In the vicinity of the Barrambie mine area, the main aquifer system is fractured granitoid and greenstone

rocks.

Depth to water in the Barrambie project area averages 35 to 40m below ground level (mbgl).


SECTION 3 - FIELD INVESTIGATIONS

3.1 DRILLING RESULTS

A number of holes have been drilled in the Barrambie deposit area for mineral exploration purposes. A

review of available data from these exploration holes suggests that the geology in the mine area is relatively

low yielding, with water inflows intercepted at the base of the weathering profile and fracture zones. Airlift

tests could not be conducted on the existing drill holes because the majority of the holes were unstable and

collapsed over time due to the high clay content.

Eleven drilling locations were identified for the mine dewatering investigation: seven holes in the south pit

area, two holes outside of the south pit area and two holes in the north pit area. Drilling of the eleven holes

commenced on 5th August 2008 by Blue Spec Mining, using RC drilling techniques.

A summary of the bores drilled around the Barrambie mine area is provided in Table 1. The locations of the

drilled bores are shown in Figure 3, with borelogs presented in Appendix A.

Table 1 Summary of Mine Monitoring Bores

Hole No. Easting (GDA94)

Northing (GDA94) Drilled Date Drilled Depth

(m) SWL

(mbgl) Location

BWB01 710,600 6,961,200 6/08/2008 72 dry Main Pit Area

BWB02 710,250 6,961,800 6/08/2008 72 36 Main Pit Area

BWB03 709,900 6,962,800 7/08/2008 72 37.8 Main Pit Area

BWB04 709,800 6,963,300 7/08/2008 72 39 Main Pit Area

BWB05 709,500 6,964,300 7/08/2008 72 49 Main Pit Area

BWB06 709,000 6,965,000 7/08/2008 72 41.3 Main Pit Area

BWB07 708,750 6,965,500 8/08/2008 72 42 Main Pit Area

BWB08 709,100 6,964,500 8/08/2008 72 48.7 Outside Main Pit Area

BWB09 710,300 6,962,400 8/08/2008 72 35.5 Outside Main Pit Area

BWB10 708,041 6,967,430 8/08/2008 72 34 North Pit Area

BWB11 706,450 6,969,169 9/08/2008 72 37 North Pit Area

3.2 HYDRAULIC TESTING

Following completion of the drilling programme, airlift tests were attempted at each open drill hole to obtain

an estimate of aquifer yields. Bores BWB01, BWB02, BWB04, BWB05 and BWB11 were dry at completion

of drilling, therefore airlift tests were not conducted. Airlift tests on bores BWB03, BWB06, BWB07, BWB08,

BWB09 and BWB10 returned only low flows and went dry within a few minutes, therefore the tests were

terminated and the rate of water level recovery was recorded for up to 20 minutes.

In order to obtain estimates on aquifer permeability, the water level recovery data was analysed using

standard graphical techniques for rising head tests. Estimated permeabilities from the holes tested, range

from 0.1m/d to 0.95m/d, with an average permeability of 0.4m/d applied for the Barrambie mine area. This is

considered to be a conservative value given the number of “dry” holes that were drilled. A summary of the

rising head test analysis is provided in Table 2, with raw data and analysis results presented in Appendix B.

FIELD INVESTIGATIONS


Table 2 Summary of Rising Head Test Analysis

Hole No. Estimated

Permeability (K) (m/day)

Location

BWB03 0.13 South Pit Area



BWB08 0.5 Outside South Pit Area

BWB09 0.3 Outside South Pit Area

BWB10 0.11 North Pit Area

Due to limitations on available casing materials, the drill holes were not cased at the time of the drilling and

hydraulic testing. However, it is planned to install casing in six of the eleven holes for future use as

monitoring bores. In addition, due to the low aquifer yields during airlift testing, it was not possible to collect

water samples for groundwater quality analysis.


SECTION 4 - MINE DEWATERING REQUIREMENTS

4.1 MINE INFLOW ASSESSMENTS

Analytical modelling was undertaken to predict groundwater inflows to the Barrambie mine over the period of

the mining operation. The analytical modelling included using a lumped parameter analytical groundwater

flow model based on the Dupuit-Forchheimer equation for flow to a large diameter well in an unconfined

aquifer. As the pit length is much larger than the pit width, estimates of parallel flow were conducted along

the pit length using Darcy’s Law of groundwater flow through a porous medium. The ends of the pit are

represented by a large diameter well with equivalent area and volume, and the model approximates the

discharge (the sum of radial flow at the pit ends and parallel flow along the pit length) from the pit required to

maintain water levels at the base of the pit.

Current mine plans indicate that both the south and north pits will be mined down to 460mRL, which is

approximately 25-30m below the local water table. The pits will be mined in stages from Stage A to Stage F.

For the purposes of the analytical modelling, Stage E and F were incorporated into Stages A to D. The

layout of the proposed mine stages are shown in Figure 4.

Pit inflow calculations have been undertaken for the proposed southern pit, where most drilling and testing

data are currently available. It is assumed that the northern pit will be subject to similar inflows.

Pit inflows were predicted for each stage of the pit, based on the following “base case” hydraulic parameters

and the following assumptions:

• Base Case permeability (K) of 0.4m/d, as discussed in Section 3.2.

• Unconfined storage (Sy) of 0.5%

• Dewatering pumping will maintain groundwater levels within the pit at or below the pit floor.

• The radius of influence of pit inflows will continue to expand as the pit develops and will not intersect

any aquifer boundaries.

Sensitivity analysis was also carried out for variations in permeability and unconfined storage. The results of

the analytical modelling are summarised in Table 3.

Table 3 Summary of Predicted Pit Inflows

Model Run Permeability (K) (m/day)

Storage (Sy) (%)

Predicted Pit Inflow (kL/d)

Base Case 0.4 0.5 950kL/d increasing to 2,400kL/d

1.0 0.5 1,800kL/d increasing to 4,100kL/d Sensitivity

1.0 1.0 2,200kL/d increasing to 5,300kL/d

The results of the analytical modelling suggest that groundwater inflow into the proposed south and north

pits will range from around 950kL/d (11L/s) at Stage A increasing to around 2,400kL/d (28L/s) toward the

end of mining at each pit. As previously mentioned this approach used analytical, lumped parameter models

and the predictions can only be considered to represent average conditions. That is, there may be higher

inflows around larger fracture networks or where higher permeability horizons exist. The sensitivity analyses

were conducted in order to estimate “worst case” inflows at such zones.

MINE DEWATERING REQUIREMENTS


Given the nature of the aquifer system (low permeability, fractured rock) it will not be practical to develop a

viable or cost effective advanced dewatering system using perimeter dewatering bores. It is recommended

that mine dewatering be achieved through the use of in-pit sump pumping.

4.2 FINAL PIT VOID ASSESSMENT

Following the completion of mining, groundwater and direct rainfall will gradually fill each pit void to form a

permanent lake. The water level in the pit will rise until equilibrium between total pit inflows and evaporative

losses from the pit lake surface has occurred. This can take many years depending on aquifer parameters

and local evaporation rates.

An analytical iterative pit water balance model was used to predict the equilibrium pit lake level for the north

and south pits. The model was used to predict the water balance for a pit lake at each mine bench as water

levels rise at the completion of mining (and dewatering) to determine at which bench level total inflows were

balance by total outflows (i.e. evaporation). The water balance model can be simply expressed as:

Groundwater Inflow + Direct Rainfall = Evaporation Losses +/- Change in Storage

The following input information was used in the water balance model:

• Predicted long-term groundwater inflow rates at various bench levels were compared with bench by

bench pit volumes.

• Direct rainfall was applied using the long-term average annual rainfall total for Meekatharra

(235mm/annum), applied over the area of the pit footprint.

• Evaporation was calculated for each bench from the bench area, using annual potential

evapotranspiration figures published by the Bureau of Meteorology (2001) (1,400mm/annum).

Under base case conditions, the model predicts that pit lake levels will reach equilibrium at approximately

475mRL (i.e. approximately 15m above the pit floor and approximately 15m below the pre-mining water

level). The model predicts that it will take approximately 5 years for the pit water level to recover to 475mRL.

As long-term pit water levels will remain below pre-mining and regional water levels, the Barrambie pits will

act as a groundwater sink, with groundwater flow directions toward the pit, and evaporative losses being the

only outflow of water from the system.

4.3 IMPACTS OF MINE DEWATERING

The main impact of dewatering on local groundwater will be the development of a large cone of depression in

the water table around the Barrambie mine. However, the background permeabilites of the basement rocks

are low, resulting in relatively low predicted dewatering rates. Analytical modelling suggests that the

drawdown cone may extend up to 2km away from the pit. However, the depth to water is expected to reduce

with distance from the mine and water level drawdown is expected to be less than 2m at a distance of 1km

away from the mine.

In practice, water level drawdowns will be focussed along major fracture and joint planes.


SECTION 5 - CONCLUSIONS & RECOMMENDATIONS

5.1 CONCLUSIONS

• Eleven holes were drilled as part of the mine dewatering investigation in August 2008.

• Airlift recovery tests were conducted at BWB03, BWB06, BWB07, BWB08, BWB09 and BWB10.

Estimated permeabilities range from 0.1m/d to 0.95m/d, with an average permeability of 0.4m/d applied

for the Barrambie mine area.

• Using conservative aquifer parameters the results of the analytical modelling suggest that groundwater

inflow into the proposed south and north pits will range from around 950kL/d (11L/s) at the beginning of

mining increasing to around 2,400kL/d (28L/s) toward the end of mining, at each pit.

• The main impact of dewatering on local groundwater will be the development of a large cone of

depression in the water table around the Barrambie mine. Analytical modelling suggests that the

drawdown cone may extend up to 2km away from the pit. However, the depth to water is expected to

reduce with distance from the mine and water level drawdown is expected to be less than 2m at a

distance of 1km away from the mine.

• In the long-term it is anticipated that the final pit void will remain a groundwater sink with evaporative

losses greater than inflows and incident rainfall.

5.2 RECOMMENDATIONS

• Dewatering via in-pit sumps is likely to be the most practicable method of dewatering. However, if

higher yielding fractures are encountered during mining, it may be possible to opportunistically install

dewatering bores if required.

• Department of Water approval should be obtained prior to commencing dewatering, through an

application for a Licence to Take Water (S5C application).

• It is recommended that monitoring of groundwater levels at the recently installed monitoring bores be

undertaken on a quarterly basis to provide a baseline data set. Once dewatering and operations

commence at Barrambie, it is recommended that groundwater level monitoring bores be installed

around the perimeter of each pit and that groundwater level monitoring increase to monthly.

• In addition, it is recommended that a groundwater quality sample be collected from each of the cased

monitoring bore in the pit areas in order to provide baseline water quality data.

SECTION 6 - REFERENCE LIST

Bureau of Meteorology (2001). Climatic Atlas of Australia – Evapotranspiration. Commonwealth of Australia,

2001.

Department of Water (2006). Mid West Minerals Province – Groundwater Resource Appraisal.

Hydrogeological Record Series, Report No. HG17. August 2006.


FIGURES

LocationMap

KALGOORLIEPERTH

Figure 1Barrambie Mine Location Plan

Author: KH

Report No: 209

Projection: MGA 94 (Zone 50)

Revised:

Job No: 767B

Drawn: KH

Scale: 1:500,000

Date: 01/10/2008Project

A

SANDSTONESANDSTONESANDSTONESANDSTONESANDSTONESANDSTONESANDSTONESANDSTONESANDSTONE

BarrambieBarrambieBarrambieBarrambieBarrambieBarrambieBarrambieBarrambieBarrambie

F:\Jobs\767\MapInfo\B9-B11\209_Fig1.WOR

A

Legend

Barrambie Tenement

Barrambie Mine Site

Figure 2Barrambie Geology Plan

Author: KH

Report No: 209

Projection: MGA94 (Zone 50)

Revised:

Job No: 767\B11

Drawn: KH

Scale: 1:100 000

Date: 03/10/2008

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6960000 mN6960000 mN6960000 mN6960000 mN6960000 mN6960000 mN6960000 mN6960000 mN6960000 mN


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F:\jobs\767\MapInfo\B9-B11\209_fig2.WOR

LocationMap

Project

KALGOORLIEPERTH

Legend

Barrambie Tenement

Barrambie minemonitoring bores

Figure 3 Monitoring Bore Location Plan

Author: KH

Report No: 209

Projection: MGA 94 (Zone 50)

Revised:

Job No: 767\B11

Drawn: KH

Scale: 1:75,000

Date: 02/10/2008



71 000 0 mE

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F:\jobs\767\MapInfo\B9-B11\209_fig3.WOR

Location

Map

Project

KALGOORLIEPERTH

Legend

Barrambie Tenement

Barrambie minemonitoring bores

http://www.docudesk.com

F:\Jobs\767\B9-B11\300\Mine Inflow\[206_Schedule Results.xls]Fig4

Barrambie South Pit - Mine StagesFigure 4

A

E

B

C

D

F

APPENDIX A

BARRAMBIE MINE BORELOGS

Well No:

Suite 4, 125 Melville ParadeComoWA 6152

Tel: (+61) (08) 9368 4044Fax: (+61) (08) 9368 4055

Australia

Client: Project:

Commenced:Completed:

Logged By:Drilled:

Static Water Level: Date:

Depth(mbgl)

Lithological Description

COMPOSITE WELL LOG

Field Notes

Method:Fluid:Bit Record:

Diagram Notes

Area:East:

North:Elevation:

Well CompletionGraphicLog

File Ref: Well No:

0

10

20

30

40

50

60

70

BWB01

Reed Resources Barrambie

6/08/08

RSMBlue Spec Mining

N/A N/A

6/08/085.25"

South Pit

710600

6961200

Conventional HammerAir

F:\Jobs\767\B9-B11\300\Borelogs\ BWB01

Bore drilled dry

150mm Blank PVCsurface casing

Open hole

Depth: 72m

Ironstone: Biege/red gravel

Clay: Brown/red, gravel, grading intomagnetite

Magnetite: Silver/grey, medium grained,unfractured and unweathered

Well No:


Tel: (+61) (08) 9368 4044Fax: (+61) (08) 9368 4055

Australia

Client: Project:


Logged By:Drilled:


Depth(mbgl)


COMPOSITE WELL LOG

Field Notes


Diagram Notes

Area:East:

North:Elevation:


File Ref: Well No:

0

10

20

30

40

50

60

70

BWB02


6/08/08

RSMBlue Spec Mining

36 mbgl Aug 08

6/08/085.25"

South Pit

710250

6961800



No consistent waterdischarge during drilling

150mm Blank PVCsurface casing (0-3m)

Open hole

Depth: 72 mbgl

Clay: Red-grey to Yellow-grey

Magnetite: Dark grey, fresh with 10%feldspar

Well No:


Tel: (+61) (08) 9368 4044Fax: (+61) (08) 9368 4055

Australia

Client: Project:


Logged By:Drilled:


Depth(mbgl)


COMPOSITE WELL LOG

Field Notes


Diagram Notes

Area:East:

North:Elevation:


File Ref: Well No:

0

10

20

30

40

50

60

70

BWB03


7/08/08

RSMBlue Spec Mining

37.8 mbgl Aug 08

7/08/085.25"

South Pit

709900

6962800


F:\Jobs\767\B9-B11\300\Borelogs BWB03



Open hole

Depth: 72 mbgl

Clay: Beige/white

METASEDIMENTS: Quartz, chlorite,pyroxene/amphibole, gold platy mica

Well No:


Tel: (+61) (08) 9368 4044Fax: (+61) (08) 9368 4055

Australia

Client: Project:


Logged By:Drilled:


Depth(mbgl)


COMPOSITE WELL LOG

Field Notes


Diagram Notes

Area:East:

North:Elevation:


File Ref: Well No:

0

10

20

30

40

50

60

70

BWB04


7/08/08

RSMBlue Spec Mining

39 mbgl Aug 08

7/08/085.25"

South Pit

709800

6963300


F:\Jobs\767\B9-B11\300\Borelogs\Logplot_data\MB04S BWB04



Open hole

Depth: 72 mbgl

Clay: Dark grey, brown, green, highlycompetent

Clay: Light grey, green, competent

Well No:


Tel: (+61) (08) 9368 4044Fax: (+61) (08) 9368 4055

Australia

Client: Project:


Logged By:Drilled:


Depth(mbgl)


COMPOSITE WELL LOG

Field Notes


Diagram Notes

Area:East:

North:Elevation:


File Ref: Well No:

0

10

20

30

40

50

60

70

BWB05


7/08/08

RSMBlue Spec Mining

49 mbgl Aug 08

7/08/085.25"

South Pit

709500

6964300





Open hole

Depth: 72 mbgl

Clay: White to pink

Clay: Brown

Well No:


Tel: (+61) (08) 9368 4044Fax: (+61) (08) 9368 4055

Australia

Client: Project:


Logged By:Drilled:


Depth(mbgl)


COMPOSITE WELL LOG

Field Notes


Diagram Notes

Area:East:

North:Elevation:


File Ref: Well No:

0

10

20

30

40

50

60

70

BWB06


7/08/08

RSMBlue Spec Mining

41.3 mbgl Aug 08

7/08/085.25"

South Pit

709000

6965000





Open hole

Depth: 72 mbgl

Clay: White

Clay: Beige to brown

METASEDIMENTS: Grey, fresh

Well No:


Tel: (+61) (08) 9368 4044Fax: (+61) (08) 9368 4055

Australia

Client: Project:


Logged By:Drilled:


Depth(mbgl)


COMPOSITE WELL LOG

Field Notes


Diagram Notes

Area:East:

North:Elevation:


File Ref: Well No:

0

10

20

30

40

50

60

70

BWB07


8/08/08

RSMBlue Spec Mining

42 mbgl Aug 08

8/08/085.25"

South Pit

708750

6965500





Open hole

Depth: 72 mbgl

Clay: Beige/red, competent

Clay: Brown/Grey, friable

Well No:


Tel: (+61) (08) 9368 4044Fax: (+61) (08) 9368 4055

Australia

Client: Project:


Logged By:Drilled:


Depth(mbgl)


COMPOSITE WELL LOG

Field Notes


Diagram Notes

Area:East:

North:Elevation:


File Ref: Well No:

0

10

20

30

40

50

60

70

BWB08


8/08/08

RSMBlue Spec Mining

48.7 mbgl Aug 08

8/08/085.25"

Outside South Pit area

709100

6964500





Open hole

Depth: 72 mbgl

Clay: White.

METASEDIMENTS: Quartz, coarsegrained, light grey.

Well No:


Tel: (+61) (08) 9368 4044Fax: (+61) (08) 9368 4055

Australia

Client: Project:


Logged By:Drilled:


Depth(mbgl)


COMPOSITE WELL LOG

Field Notes


Diagram Notes

Area:East:

North:Elevation:


File Ref: Well No:

0

10

20

30

40

50

60

70

BWB09


8/08/08

RSMBlue Spec Mining

35.5 mbgl Aug 08

8/08/085.25"

Outside South Pit Area

710300

6962400





Open hole

Depth: 72 mbgl

Clay: Beige/white

METASEDIMENTS: Quartz, chlorite,pyroxene/amphibole, gold platy mica

Well No:


Tel: (+61) (08) 9368 4044Fax: (+61) (08) 9368 4055

Australia

Client: Project:


Logged By:Drilled:


Depth(mbgl)


COMPOSITE WELL LOG

Field Notes


Diagram Notes

Area:East:

North:Elevation:


File Ref: Well No:

0

10

20

30

40

50

60

70

BWB10


8/08/08

RSMBlue Spec Mining

34 mbgl Aug 08

8/08/085.25"

North Pit

710300

6962400


F:\Jobs\767\B9-B11\300\Borelogs\Logplot_data\MB10N BWB10



Open hole

Depth: 72 mbgl

Clay: Red to Beige, soft

METASEDIMENTS: Grey, coarse grained,unweathered/unfractured

Well No:


Tel: (+61) (08) 9368 4044Fax: (+61) (08) 9368 4055

Australia

Client: Project:


Logged By:Drilled:


Depth(mbgl)


COMPOSITE WELL LOG

Field Notes


Diagram Notes

Area:East:

North:Elevation:


File Ref: Well No:

0

10

20

30

40

50

60

70

BWB11


9/08/08

N/ABlue Spec Mining

37 mbgl Aug 08

9/08/085.25"

North Pit

706450

6969169


F:\Jobs\767\B9-B11\300\Borelogs\Logplot_data\MB11N BWB11


Lithology not logged


Open hole

Depth: 72 mbgl

APPENDIX B

RISING HEAD TEST DATA & ANALYSIS

RISING HEAD TEST

Bore No: MB3 Test No: #1 Job No: 767/B10 Date: 09-08-08 Logged by: RM Analysed by: AB

Borehole co-ordinates: Easting: 709900 Northing: 6962800 Collar elevation (m):Depth to top of test section (m): 37.79 Length of test section, L (m): 34.21Depth of static water level, Hw (m): 37.79 Radius of borehole, r (m): 6.67E-02Excess head, he (m): -11.42 Radius of standpipe or casing, rc (m): 6.67E-02

Time Depth to Excess head, ht/he

water, hw ht=Hw-hw

(min) (m) (m)2.0 49.21 -11.42 1.002.5 47.77 -9.98 0.873.0 47.53 -9.74 0.854.0 45.95 -8.16 0.715.0 44.27 -6.48 0.576.0 43.05 -5.26 0.467.0 42.62 -4.83 0.428.0 41.81 -4.02 0.359.0 40.80 -3.01 0.26

10.0 40.32 -2.53 0.2212.0 39.4 -1.61 0.1414.0 38.85 -1.06 0.0916.0 38.31 -0.52 0.05

18 37.98 -0.19 0.0220 37.79 0 0.00

Calculations: h1 1.00t1 2.0h2 0.09t2 14.0S 8.6E-02

k 1.49E-06

Permeability, k = 0.133 x S x (rc2/L) (m/sec)where S = (log (h1/h2)/(t2 - t1), (ie slope of plot, t in mins)

Head - time graph (slope of graph is S)

Notes:

0.01

0.10

1.00

0 2 4 6 8 10 12 14 16 18 20

Time (min)

ht/

he

F:\Jobs\767\B9-B11\300\200_Barrambie_mine_RHT.xls Checked by: KH (16/09/08)

RISING HEAD TEST

Bore No: MB6 Test No: #1 Job No: 767/B9-B11 Date: 10-Aug-08 Logged by: RM Analysed by: AB



water, hw ht=Hw-hw

(min) (m) (m)1.0 47.69 -6.40 1.001.5 46.96 -5.67 0.892.0 46.78 -5.49 0.862.5 46.56 -5.27 0.823.0 46.35 -5.06 0.794.0 45.80 -4.51 0.705.0 45.14 -3.85 0.606.0 44.59 -3.3 0.527.0 44.13 -2.84 0.448.0 43.63 -2.34 0.379.0 43.33 -2.04 0.3210 42.95 -1.66 0.2612 42.3 -1.01 0.1614 41.92 -0.63 0.1016 41.57 -0.28 0.0418 41.29 0 0.00


k 1.33E-06



Notes:

0.01

0.10

1.00

0 2 4 6 8 10 12 14 16 18 20

Time (min)

ht/

he


RISING HEAD TEST

Bore No: BWB7 Test No: #1 Job No: 767/B9-B11 Date: 10-Aug-08 Logged by: RM Analysed by: AB



water, hw ht=Hw-hw

(min) (m) (m)1.0 43.87 -1.92 1.001.5 42.90 -0.95 0.492.0 42.40 -0.45 0.232.5 42.24 -0.29 0.153.0 42.11 -0.16 0.084.0 41.99 -0.04 0.025.0 41.95 0 0.006.0 41.95 0 0.00


k 1.10E-05



Notes:

0.01

0.10

1.00

0 1 2 3 4 5 6

Time (min)

ht/

he


RISING HEAD TEST




water, hw ht=Hw-hw

(min) (m) (m)1.5 48.75 -0.10 1.003.0 48.71 -0.06 0.603.5 48.69 -0.04 0.404.5 48.68 -0.03 0.305.0 48.67 -0.02 0.206.0 48.66 -0.01 0.10


k 5.63E-06



Notes:

0.01

0.10

1.00

0 1 2 3 4 5 6 7 8 9 10Time (min)

ht/

he


RISING HEAD TEST


Borehole co-ordinates: Easting: 710300 Northing: 6962400 Collar elevation (m):Depth to top of test section (m): 35 Length of test section, L (m): 33.1Depth of static water level, Hw (m): 35 Radius of borehole, r (m): 6.67E-02Excess head, he (m): -14.86 Radius of standpipe or casing, rc (m): 6.67E-02


water, hw ht=Hw-hw

(min) (m) (m)2.0 49.86 -14.86 1.002.5 47.95 -12.95 0.873.0 45.00 -10 0.673.5 43 -8 0.544.0 41.54 -6.54 0.44

5 39.27 -4.27 0.296 37.57 -2.57 0.177 36.9 -1.9 0.138 36.22 -1.22 0.089 35.82 -0.82 0.06

10 35.65 -0.65 0.0412 35.59 -0.59 0.04


k 3.21E-06



Notes:

0.01

0.10

1.00

0 2 4 6 8 10 12

Time (min)

ht/

he


RISING HEAD TEST


Borehole co-ordinates: Easting: 710300 Northing: 6962400 Collar elevation (m):Depth to top of test section (m): 34 Length of test section, L (m): 36.05Depth of static water level, Hw (m): 34 Radius of borehole, r (m): 6.67E-02Excess head, he (m): -10.60 Radius of standpipe or casing, rc (m): 6.67E-02


water, hw ht=Hw-hw

(min) (m) (m)1.0 44.60 -10.60 1.002.0 43.83 -9.83 0.933.0 41.54 -7.54 0.713.5 41.15 -7.15 0.67

5 39.1 -5.1 0.486 38.2 -4.2 0.407 37.78 -3.78 0.368 37.35 -3.35 0.329 36.9 -2.9 0.27

10 36.67 -2.67 0.2512 36.36 -2.36 0.2214 36.02 -2.02 0.1916 35.95 -1.95 0.18


k 1.24E-06



Notes:

0.10

1.00

0 2 4 6 8 10 12 14 16 18 20

Time (min)

ht/

he


Documents

BARRAMBIE MINE DEWATERING INVESTIGATION · Eleven drilling locations were identified for the mine dewatering investigation: seven holes in the south pit area, two holes outside of