1. Christopher M. Yeomans1,2 Doctoral Researcher
1 Camborne School of Mines, University of Exeter
2 British Geological Survey, Keyworth

2. Overview PhD Research Aims
BGS
PhD Research Aims
To use cluster analysis and Self-Organising Maps (SOMs) for remote mapping in difficult regions
To conduct a prospectivity analysis of the region using newly derived data
CSM
Additional roles
Teaching GIS, field mapping and supervising MSc students
Developing the use of tablet computing for field-based teaching
I aim to develop novel mapping techniques which will improve our understanding in areas of low outcrop exposure, furthermore, the re-mapping of this area may help to enhance our understanding on granite distribution in a world-class Sn-W[±Cu,Pb,Zn,U,Ag…] mining region
Other research interests
Ore deposit geology
Geothermal energy exploration

3. Airborne radiometric data from the Tellus South West survey
SW England region
Geological interests
Complex structure
Permian Granites (Cornubian Batholith)
Magmatic-hydrothermal mineralisation (W-Sn)
Bodmin
My data
Airborne radiometric data
Airborne magnetic data
Airborne LiDAR data
Stream-sediment geochemistry
Soil geochemistry
Any other free data!
50 km
Airborne radiometric data from the Tellus South West survey

4. Critical metal associations
Simons et al. (2013)
Sb, Bi and W historically mined
W, Sn and In are potential by-products from prospects such as Drakelands, Redmoor and South Crofty
Different granite types host different critical metals suites
Can we find them? Rapidly?
N.B. It may not be a magmatic process that concentrates these elements
Biotite
Li-mica Li Ga Nb Ta W Be Ge As Cd In Sn Sb
Chalcophile
Lithophile

5. Airborne radiometric data from the Tellus South West survey
Radiometric data over Bodmin Moor
Known geochemical anomalies for W and Sn
Airborne radiometric data (Tellus South West)
Stream-sediment geochemical data (G-BASE)
Existing maps
Sum-normalised data reduces noise
eU is oxidised in oxic conditions, peat is anoxic therefore eU is elevated
Th/K
K/(K+Th)
Th/ (K+Th)
Key aspects
Green/Blue (high eTh) outer rim, Red (high K) inner core
NW area now shows moderate K
Bodmin
Field ‘brash’
Tors
Phoenix Tin Mine
Key aspects – relative abundances
Using sum-normalised K and eTh and Th/K
No eU
50 km
K > Th
Airborne radiometric data from the Tellus South West survey
Th > K
SE Bodmin Moor looking north towards Phoenix Tin Mine (Photo courtesy of B. Simons)
10 km

6. Wider applications of research and skills
Cluster analysis and SOMs can be applied to nearly any geospatial data
Different data types can be integrated to improve the accuracy of SOMs
Airborne radiometric data basic method in U and REE exploration
Other skills:
GIS analysis
Database management
Digital field techniques
R-statistics
Effective data presentation
Second bullet – mention effects of attenuation over peat. Differentiate between high eTh granite and what ?
50 km