3D Mineral Maps from HyLogger
Data – Examples from the eastern Gawler
Craton.
29th of June, 2016, Australian Earth Sciences Convention, Adelaide
www.statedevelopment.sa.gov.au
3D Mineral Maps from HyLogger Data
29th of June, 2016, Australian Earth Sciences Convention, Adelaide
Simon van der Wielen
Senior Research Scientist
Deep Exploration Technologies Cooperative Research Centre
Geological Survey of South Australia and the University of Adelaide
Co-authors: Adrian Fabris, Georgina Gordon, Alan Mauger,
John Keeling, and David Giles.
www.statedevelopment.sa.gov.au
SA HyLogger Data
849 drill holes scanned:
• 329 HyLogger 1
• 148 HyLogger 2
• 372 HyLogger 3
206,305 m of core scanned
24,937,291 individual spectra
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
3
Standard TSG products
TSG is very good at:
• Processing HyLogger data
• Determining mineralogy for individual drill holes
• Producing spectral scalars and indices
• Visualising individual drill holes
TSG has trouble with:
• Batch processing of multiple drill holes
• Visualising multiple HyLogger drill holes in 3D
• Integrating and querying HyLogger data with
other datasets
4
Workflow - HyLogger
Two stage workflow:
1. AutoHotKey (AHK) scripts
to batch process HyLogger
data with TSG software.
2. Excel VBA scripts to
produce a clean,
consistent csv file for
import to gOcad 3D
modelling software.
van der Wielen, S.E, Fabris, A., Mauger, A., Gordon, G., Keeling., and Giles., D.,
2016. South Australian Spectral Database. RB2016/XX.
5
Workflow – gOcad
Three stage workflow:
1. Data imported to gOcad
2. Data analysis and QA/QC
checks
3. Interpolation (3D grid)
Interpretation and Visualisation
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
6
Data Import - Drill Holes
Olympic Dam
SA HyLogger Data
• 849 drill holes, 206 km scanned
• 283 different properties
x10 VE
• Down sampled to 1 m intervals
Hematite TIR Spectral Abundance
0
0.05
0.1
0.15
0.2
x25 VE
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
7
Data Analysis – Histograms
count
White Mica TIR spectral abundance
0.2
0
0.6
0.8
1.0
0.001Log(TSG Weight)0.01
0.1
1.0
0.4
TSG Weight
count
Log-transformed
8
0.00001
0.0001
Data Analysis – Histograms
count
White Mica SWIR spectral abundance
0.2
0
0.6
0.8
1.0
0.001Log(TSG Weight)0.01
0.1
1.0
0.4
TSG Weight
count
Log-transformed
9
0.00001
0.0001
3D Geological Model
Cell Size
1 km, 1 km, 100 m
(X, Y, Z)
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
10
Interpolation – Up Scaling
Block Model Cell
1 km, 1 km, 100 m
(X,Y,Z)
0
Hematite TIR Spectral Abundance
0.05
0.1
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
0.15
0.2
11
Interpolation – 3D Gridding
IDW
Log IDW
Log Transformed Hematite TIR Spectral Abundance
Hematite TIR Spectral Abundance
0.0
0.05
0.1
0.15
0.2
0.00001
0.0001
DSI
0.001
0.01
0.1
0.2
Log DSI
Horizontal Slice
-300 mRL
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
12
Interpolation – 3D Gridding
Log IDW1
Log IDW1.5
Parameter Tests
Exponential Rate of Decay Tests
Log Transformed Hematite TIR Spectral Abundance
0.00001
0.0001
Log IDW2
Horizontal Slice
-300 mRL
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
0.001
0.01
0.1
0.2
Log IDW3
13
Olympic Dam IOCG
1590 Ma Mineral Systems
Wade 2014, adapted from Corbett
Emmie Bluff
IOCG
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
14
Histogram
Hematite Mineral Map
Olympic Dam
0.000001
0.00001
0.0001
0.001
0.01
0.1
0
1.0
Hematite TIR Spectral Abundance Log(TSG Weight)
Iso surfaces
Pt Augusta
10x vertical exaggeration
0.000001
Hematite TIR Spectral Abundance
0. 00001
0. 0001
0.001
0. 01
0. 1
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
0.0
1
Horizontal Slice
-300 mRL
15
Histogram
Magnetite Mineral Map
Olympic Dam
0.000001
0.00001
0.0001
0.001
0.01
0.1
0
1.0
Magnetite TIR Spectral Abundance Log(TSG Weight)
Iso surfaces
Pt Augusta
10x vertical exaggeration
0.000001
MagnetiteTIR Spectral Abundance
0. 00001
0. 0001
0.001
0. 01
0. 1
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
0.0
1
Horizontal Slice
-300 mRL
16
Histogram
Chlorite Mineral Map
Olympic Dam
0.000001
0.00001
0.0001
0.001
0.01
0.1
0
1.0
Chlorite TIR Spectral Abundance Log(TSG Weight)
Iso surfaces
Pt Augusta
10x vertical exaggeration
0.000001
Chlorite TIR Spectral Abundance
0. 00001
0. 0001
0.001
0. 01
0. 1
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
0.0
1
Horizontal Slice
-300 mRL
17
Histogram
White Mica Mineral Map
Olympic Dam
0.000001
0.00001
0.0001
0.001
0.01
0.1
0
1.0
White Mica TIR Spectral Abundance Log(TSG Weight)
Iso surfaces
Pt Augusta
10x vertical exaggeration
0.000001
White Mica TIR Spectral Abundance
0. 00001
0. 0001
0.001
0. 01
0. 1
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
0.0
1
Horizontal Slice
-300 mRL
18
Histogram
K-Feldpar Mineral Map
Olympic Dam
0.000001
0.00001
0.0001
0.001
0.01
0.1
0
1.0
K-Feldspar TIR Spectral Abundance Log(TSG Weight)
Iso surfaces
Pt Augusta
10x vertical exaggeration
0.000001
K-Fledspar TIR Spectral Abundance
0. 00001
0. 0001
0.001
0. 01
0. 1
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
0.0
1
Horizontal Slice
-300 mRL
19
Histogram
Amphibole Mineral Map
Olympic Dam
0.000001
0.00001
0.0001
0.001
0.01
0.1
0
1.0
Amphibole TIR Spectral Abundance Log(TSG Weight)
Iso surfaces
Pt Augusta
10x vertical exaggeration
0.000001
Amphibole TIR Spectral Abundance
0. 00001
0. 0001
0.001
0. 01
0. 1
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
0.0
1
Horizontal Slice
-300 mRL
20
Histogram
Garnet Mineral Map
Olympic Dam
0.000001
0.00001
0.0001
0.001
0.01
0.1
0
1.0
Garnet TIR Spectral Abundance Log(TSG Weight)
Iso surfaces
Pt Augusta
10x vertical exaggeration
0.000001
Garnet TIR Spectral Abundance
0. 00001
0. 0001
0.001
0. 01
0. 1
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
0.0
1
Horizontal Slice
-300 mRL
21
Histogram
Albite Mineral Map
Olympic Dam
0.000001
0.00001
0.0001
0.001
0.01
0.1
0
1.0
Albite TIR Spectral Abundance Log(TSG Weight)
Iso surfaces
Pt Augusta
10x vertical exaggeration
0.000001
Albite TIR Spectral Abundance
0. 00001
0. 0001
0.001
0. 01
0. 1
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
0.0
1
Horizontal Slice
-300 mRL
22
Histogram
Apatite Mineral Map
Olympic Dam
0.000001
0.00001
0.0001
0.001
0.01
0.1
0
1.0
Apatite TIR Spectral Abundance Log(TSG Weight)
Iso surfaces
Pt Augusta
10x vertical exaggeration
0.000001
Apatite TIR Spectral Abundance
0. 00001
0. 0001
0.001
0. 01
0. 1
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
0.0
1
Horizontal Slice
-300 mRL
23
Conclusions
Spectral Database
• First time that all of the HyLogger Data in SA was processed in a
consistent format.
• This could not have been achieved without the development of
batch scripts
3D Mineral Maps
• All the HyLogger data can now be visualised in 3D.
• Map
van der Wielen, et. al., 2016. 3D Mineral Maps from HyLogger Data.
24
Disclaimer
The information contained in this presentation has been compiled by the Department of State
Development (DSD) and originates from a variety of sources. Although all reasonable care has been
taken in the preparation and compilation of the information, it has been provided in good faith for
general information only and does not purport to be professional advice. No warranty, express or
implied, is given as to the completeness, correctness, accuracy, reliability or currency of the
materials.
DSD and the Crown in the right of the State of South Australia does not accept responsibility for and
will not be held liable to any recipient of the information for any loss or damage however caused
(including negligence) which may be directly or indirectly suffered as a consequence of use of these
materials. DSD reserves the right to update, amend or supplement the information from time to
time at its discretion.
www.statedevelopment.sa.gov.au
Contact
Geological Survey of South Australia
Level 4, 11 Waymouth Street
Adelaide, South Australia 5000
GPO Box 320
Adelaide, South Australia 5001
T: +61 8 8226 3821
E: [email protected]
www.statedevelopment.sa.gov.au