A new method for spatial centrographic analysis of mineral deposit clusters
A centrographic method for analysing mineral deposit clusters is illustrated using the komatiite-hosted Kambalda nickel sulphide deposit cluster, Yilgarn craton, Western Australia. In this method, the standard distance circle divides the cluster into a more endowed inner part and a less endowed pe...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2016
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| Subjects: | |
| Online Access: | https://www.researchgate.net/publication/248211962 http://hdl.handle.net/11408/1672 |
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| Summary: | A centrographic method for analysing mineral deposit clusters is illustrated using the komatiite-hosted
Kambalda nickel sulphide deposit cluster, Yilgarn craton, Western Australia. In this method, the standard
distance circle divides the cluster into a more endowed inner part and a less endowed peripheral part. The
standard deviational ellipse, another centrographic object, depicts the preferred northwest–southeast trend
of nickel orebodies at Kambalda. Weighted centrography shows that nickel endowment is greater in the
eastern than western part of the cluster. The spatio-geometric interaction of the circle and ellipse splits the
cluster into several partitions. The relative concentration of nickel orebodies or endowment within a
partition in relation to their concentration within the entire cluster is termed ‘capture efficiency’. Komatiite
areal trace exhibits higher nickel orebody capture efficiency than spatio-geometric partitions; however, some
spatio-geometric partitions exhibit nickel endowment capture efficiencies comparable to that of komatiite.
Furthermore, nickel orebody and endowment capture efficiencies of komatiite are elevated only within the
standard distance circle. These results suggest that at Kambalda, (i) the standard distance circle is a prime
window for understanding the komatiite-hosted nickel system, and (ii) spatio-geometric partitions are
plausible locales for spatial analysis of nickel orebodies and endowment. The proposed centrographic
method is potentially useful in mineral resource estimations and mineral exploration targeting. |
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