Consolidated Minerals Limited (“CML”) is an independent private company incorporated in Jersey. CML is a manganese and chromite ore producer with operations in Australia and Ghana, complemented by a trading-arm based in Singaporearm based in Singapore.

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ContentsContents

Previous workC t d Case study area Location + design AEM system specificationsAEM system specifications Data profiles and channel grids CDI processing

Conclusions

3

LocationLocation

Woodie Woodie Manganese mine Woodie Woodie Manganese mine is located in the East Pilbara region of Western Australia

The mine consists of approximately 100km2 of mine corridor and 5500km2 ofcorridor and 5500km2 of greenfields area outside of this corridor

Pilbara Manganese supplies high-grade ore to the international

l i dsteel industry

4

StratigraphyStratigraphy Manganese in the Woodie Woodie region

is hosted by Carawine Dolomite chertis hosted by Carawine Dolomite, chert breccia, and the overlying Manganese Subgroup sedimentary rocks

Orebodies show a range of orientations, from stacked bedding-parallel lenses (stratabound) to steeply dipping or(stratabound) to steeply dipping or plunging bodies (fault hosted)

A d it i i 0 5Mt (0 2 Average deposit size is 0.5Mt (0.2 –5.5Mt), generally 50-100m wide, 100-600m long and deepest ore zones extend 200m below surface (open at depth)200m below surface (open at depth)

From Jones, 2011

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From Jones, 2011

Physical PropertiesPhysical Properties Manganese (Mn) is often conductive compared to host rocks

Chert and dolomite are resistive Chert and dolomite are resistive Permian clays and Jeerinah formation black shales are conductive

and must be accounted for during processing/interpretation

Conductivity response related to mineralisation can depend on Mn mineral type, grade and iron content

6

Initial AEM Surveying A HoisTEM survey was flown by GPX surveys over the Woodie Woodie

mine corridor in 2002

Initial AEM Surveying

mine corridor in 2002 Discrete targets were interpreted and a number tested by drillholes Chris D deposit was an EM discovery – mineralisation below 30-50m

of conductive coverof conductive cover

pth

(m)

A BCDI Depth Slice 50m

From Hashemi, 2005D

ep

200m

Jeerinah Shale

AJeerinah Shale

Chris D

B

AEM surveys were flown over regional project areas based on the success of targets from the HoisTEM survey500m

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Case Study AreaLocation Bee Hill

Regional project area Regional project area Approximately 60km SW of

Woodie Woodie mine

Woodie Woodie Mine

Case study area chosen based on detailed geological mapping, previous drilling and geophysical surveying

Bee Hill Project Area

Case Study Area

15km

8

15km

Case Study Area Geology

CfCf

ACxs

PMsx

PMssm

Acx

C

Tsg

PDod 500m

N

9

Case Study Area AEM Systems Three heli-borne AEM systems were flown over the case study area

RepTEM in May 2008 by GPX Surveys RepTEM in May 2008 by GPX Surveys VTEM in May 2009 by Geotech Airborne XTEM in November 2009 by GPX Surveys

RepTEM VTEM XTEM

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Case Study Area System Specifications

RepTEM VTEM (12) XTEMMoment (Am2) 112 000 400 000 102 000Duty Cycle (%) 25 36.7 25W f h S T id l S

Power

Waveform shape Square Trapezoidal SquareRamp Off (µs) 40 1340 45Data Channels 21 28 (35*) 30

Transmitter turn off time

Data Channels 21 28 (35 ) 30Along line sampling (m) 9 2 9

Historically, systems with resolution in the early times were considered ideal for near-surface, moderately conductive bodies

New geology model suggested deeper bodies and structural relationship important

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Case Study Area Survey Specifications Flight line direction for all systems was E-W, perpendicular to geology

and structures of interestand structures of interest Line spacing was determined for each system based on the transmitter

parameters and resolution of manganese targets80m for RepTEM and XTEM 80m for RepTEM and XTEM

100m for VTEM

Traditionally, AEM systems measure the time rate of change of the magnetic field (dB/dt) = RepTEM and XTEM

VTEM calculates the B-field data from dB/dt, equivalent to a direct , qmeasurement of the magnetic field

12

Case Study AreaProspect of Interest

-38000m

-39000m

L2740 RepTEML19940 VTEML40100 XTEM

-40000m

L40100 XTEM

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

500m

N

13

Case Study Area Data Profiles

RepTEM XTEM

14

Case Study Area Data Profiles

VTEM dB/dt - original VTEM dB/dt - reprocessed

15

Case Study Area Data Profiles

VTEM B-field - original VTEM B-field - reprocessed

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Case Study Area Channel Grids Each time channel was gridded for the three systems, including both B-

field and dB/dt original and reprocessed data for the VTEM surveyfield and dB/dt, original and reprocessed data for the VTEM survey Earliest time channel available (not noise) Mid-time channel

L i h l (b f i l idd b i ) Latest time channel (before signal over-ridden by noise)

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RepTEM Ch 02 (~67.5 µs) XTEM Ch 01 (~114 µs)

VTEM dB/dt original Ch 08 (~83 µs)

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

VTEM dB/dt reprocessed Ch 01 (~10 µs)( )

VTEM B-field original Ch 08 (~83 µs)

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

VTEM B-field reprocessed Ch 01 (~10 µs)

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1km

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

RepTEM Ch 08 (~507 µs) XTEM Ch 08 (~316 µs) 12

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

VTEM dB/dt reprocessed Ch 16 (~339 µs)VTEM dB/dt original Ch 20 (~682 µs)

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

VTEM B-field reprocessed Ch 16 (~339 µs)VTEM B-field original Ch 20 (~682 µs)-1

9000

m

-200

00m

-210

00m

-220

00m

-230

00m

19

1km

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

RepTEM Ch 13 (~2278 µs) XTEM Ch 23 (~3482 µs)

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

VTEM dB/dt original Ch 31 (~4620 µs) VTEM dB/dt reprocessed Ch 31 (~4620 µs)

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

VTEM B-field original Ch 31 (~4620 µs) VTEM B-field reprocessed Ch 31 (~4620 µs)

20

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

-190

00m

-200

00m

-210

00m

-220

00m

-230

00m

1km

Case Study Area Conductivity Depth Imaging EM data from each system was inverted using EMFlow software to

produce a conductivity depth modelproduce a conductivity depth model Equivalent lines from each system windowed to the prospect of interest

are presentedL2740 RepTEM L2740 RepTEM

L19940 VTEM L40100 XTEM

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170.10.0

-50.0

289.40.0

-50.0

10.0

1.0

-100.0

-150.0

-200.0

10.0

1 0

-100.0

-150.0

-200.0

0.1-250.0

-300.0RepTEM

1.0

0.1

-250.0

-300.0XTEM

-50.0

-100.0

150 0

0.0 522.3

10.0

-50.0

-100.0

0.0 581.7

10.0

-150.0

-200.0

-250.0

-300.0

1.0

0.1

-150.0

-200.0

-250.0

-300.0

1.0

0.1

242.4-50.0

0.0

50 00.0 368.4

VTEM dB/dt

VTEM dB/dt reprocessed

300.0

10.0

1.0

0.1

-100.0-150.0

-200.0

-250.0

-50.0-100.0-150.0

-200.0

250 0

10.0

1.0

0 1-300.0

VTEM B-field 22

-250.0

-300.0VTEM B-field reprocessed

0.1

1km

Case StudyDrilling

W E

Proterozoic shale with Mn ± Fe

7m @ 32% Mn, 20% Fe4m @ 37% Mn, 19% Fe

CDI anomaly outline

Chert/highly silicified dolomite

21m @ 32% Mn, 19% Fe10m @ 39% Mn, 16% Fe

50m

23

50m

Fig Tree a quick comparisonFig Tree – a quick comparison Project area approximately 40km South of Woodie Woodie mine VTEM survey flown in 2009 using 100m line spacing with lines oriented VTEM survey flown in 2009 using 100m line spacing with lines oriented

perpendicular to major structures and lithology trends

D i l i i h l dB/d d B fi ld Dominantly resistive host geology, dB/dt and B-field responses very similar

B-field 1km

dB/dt

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dB/dt 1km

ConclusionsConclusions Three time domain airborne EM systems flown over a case study area

with known manganese mineralisationwith known manganese mineralisation Each system showed a discrete anomalous response in channel time

data and a conductor in the CDI related to Mn

High signal to noise and the B-field option of the VTEM system provides an advantage over traditional dB/dt systems shows target into late time channels when conductive overburden

response has decayed

Geology of the survey area should be considered when targeting Mn using AEM Conductive overburden = B-field data for target discriminationConductive overburden B field data for target discrimination Dominantly outcropping resistive geology = dB/dt data provides

reasonable targets

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ReferencesReferences

Hashemi, A., 2005. Innovative geophysical exploration for high-grade manganese ore under regolith andHashemi, A., 2005. Innovative geophysical exploration for high grade manganese ore under regolith and sedimentary cover in the East Pilbara of Western Australia, Curtin University of Technology Doctor of Philosophy thesis, 226p.

Jones, S., 2011. Proterozoic deformation in the east Pilbara Craton and teconic setting of fault-hosted manganese at the Woodie Woodie mine, Australian Journal of Earth Sciences, 58, p. 639-673

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