Mineral Systems Research in South Australia

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Mineral Systems Research in South Australia




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Presentations text content in Mineral Systems Research in South Australia

Slide1

Mineral Systems Research in South Australia

Mineral Systems Workshop 1-3rd July 2013Martin Fairclough & Simon van der Wielen

www.dmitre.sa.gov.au

Slide2

Outline

2

Changing

Role of the Geological Survey

Mineral Systems and Mineral Potential Mapping Research in GSSA

Examples

DETCRC Projects

GSSA Projects

Issues

Slide3

Changing Role of the Geological Survey

3

Driven by changes in the economic and political environment

requirement to be more aligned to resource industry requirements (partly in response to changes in the industry)

going beyond just precompetitive data, but actually focusing on value-adding to create more downstream exploration datasets (and concepts)

Slide4

Mineral Systems & Mineral Potential Research

Significant PIRSA (now DMITRE) involvement in pmd*CRC (including one on one projects) and post CRC projects with CSIROEstablishment of an “Exploration Geology Group” (EGG) in GSSA 2007 – produced a range of “key ingredients maps for commodities grouping deposit models)Chiropractic re-alignment of GSSA to form a dedicated Mineral Systems Team (2011). Process-driven approach

4

Slide5

Mineral Systems & Mineral Potential Research

GSSA has been utlising the Five (or more) Questions approach for years – we just haven’t called it that! Very much a process-driven approach, particularly steering away from prescriptive ore-deposit model nomenclature (e.g IAEA), even though we still use the latter for communication purposes The Mineral Systems team focuses on the task of understanding the processes, and in conjunction with the Mapping and Modeling teams, translating the critical processes to mapable elements (or proxies)

5

Slide6

Case study - DETCRC

Emmie Bluff – reverse engineering an IOCG to understand that alteration system (targeting elements) and generating mapable criteriaGeochemical trends in IOCG alteration - new data from the Gawler Craton (Adrian Fabris)Geochemical sampling protocol and initial results from the Emmie Bluff case studyExploration strategies for IOCG mineral systems under deep cover (Simon van der Wielen)IOCG exploration strategy and initial results Emmie Bluff case study

6

Slide7

Workflow

Slide8

1x vertical exaggeration

60

km

9.8

km

N

Geological Surfaces

52

km

Emmie

Bluff 3D Model

Emmie

Bluff

8 –

Mulgathing

Complex

5 – Wallaroo Group

0 – DEM Surface

1 – Neoproterozoic

2 – Gairdner Dyke Swarm

4 – Gawler Range Volcanics

3 – Pandurra Formation

6 – Donington Suite

7 – Hutchinson Group

Listric

Faults

Vertical Faults

Slide9

10x vertical exaggeration

1

0

km

2

km

N

Geochemistry Data

10

km

Emmie Bluff 3D Model

Emmie

Bluff

Sericite

Hematite

Magnetite

Hematite – Magnetite

K-Feldspar

Albite

Sericite – Chlorite

Chlorite

Slide10

10x vertical exaggeration

1

0

km

2

km

N

Hylogger

Data

10 km

Emmie Bluff 3D Model

Emmie

Bluff

2195

2225

Sericite Composition

Muscovitic

Phengitic

Slide11

10x vertical exaggeration

10

km

2

km

N

Alteration

Voxet

10

km

Emmie

Bluff 3D Model

Emmie

Bluff

Sericite

Hematite

Magnetite

Hematite – Magnetite

K-Feldspar

Albite

Sericite – Chlorite

Chlorite

500 m x 500 m x 10

m cell size

Slide12

Key Learnings from Emmie Bluff Case

Sample spacing for proposed pattern drilling program

Sampling strategy (unconformity

vs

sampling into the basement)

Has the current drilling tested the

Emmie

Bluff IOCG system?

Slide13

Geochemical IOCG Prospectivity Index

Elements associated with IOCG mineral systemsBased on 10x crustal abundanceCan distinguish proximal from distal alterationIndependent of host lithologySee poster and Adrian Fabris in foyer

13

Slide14

14

Olympic Dam

Carapateena

Modeling the

mapable

elements – putting it together

Alteration (DETCRC) and geophysical modeling of IOCG systems

S. van der

Weilen

,

L. Katona and A.

Fabris

Australian Copper Conference, June 18-19

th

2013

Martin Fairclough, Geological Survey of SA

Slide15

15

New Data Collection To Further Test Modeling Concepts

Australian Copper Conference, June 18-19

th

2013

Martin Fairclough, Geological Survey of SA

Slide16

Case study 2

16

All IOCGs in South Australia are elevated in uranium, as are large parts of the surrounding host rocks (“the reservoir”).

No significant elevated uranium older than ca. 1580-1590 Ma

However, considerable examples of anomalous (some economic) uranium throughout younger rocks (such as Beverley, possibly active very recently)

So the fluid pathways and drivers are working well also

What about other traps? “

uncomformity

-related” just to give one possibility a name.

Slide17

Case study 2

17

All IOCGs in South Australia are elevated in uranium, as are large parts of the surrounding host rocks (“the reservoir”).

No significant elevated uranium older than ca. 1580-1590 Ma

However, considerable examples of anomalous (some economic) uranium throughout younger rocks (such as Beverley, possible active very recently)

So the fluid pathways and drivers are working well

What about other traps? “

uncomformity

-related” just to give one possibility a name. So – first understand the processes.

Slide18

Case study 2 – Athabasca and

Cariewerloo

Slide19

Case study 2 – Athabasca and

Cariewerloo

Slide20

Multi-parameter

lithostratigraphic

logging

Hyperspectral

logging

Magnetic

depth to

basement

Geophysical

Interpretation

AEM

survey

Adobe 3D pdf

Case study 2 – Athabasca and Cariewerloo

Slide21

And numerous other projects

........... That are not explicitly “Mineral Systems Approach” but nevertheless follow the same philosophy

In fact, virtually all GSSA projects in some form have the MSP goal in mind, as well as mineral potential

modeling

and undiscovered resource endowment

modeling

.........but still some issues to resolve on data standards and delivery.

Slide22

Issues and discussion

Standard Mineral Systems approach:

does not adequately address post-depositional modifications (maybe duration of events should be extended to multiple events) (

Jaireth

)

t

his is related to the preservation issues

Does not easily encompass co-existing deposit types in same mineral system(s) (Huston).

e.g

Gawler

Craton

IOCG, skarn,

mesothermal

gold, epithermal gold/silver and porphyries(?)

Critical dataset collection should be prioritised by understanding critical processes and subsequently, targeting/

mapable

elements – not dumb precompetitive data collection to fill gaps.

Only an understanding of the processes will determine scale-dependency and subsequent

mapable

criteria (even for Geological Survey’s precompetitive data collection)

Slide23

Issues and discussion


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