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Geology and geochemistry of gold-copper iron oxide systems: Tennant Creek and Starra districts. Volume II (CODES publication 7)

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Large, RR and Robinson, P (1987) Geology and geochemistry of gold-copper iron oxide systems: Tennant Creek and Starra districts. Volume II (CODES publication 7). Technical Report. University of Tasmania, Hobart, Tasmania.

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Abstract

A set of criteria. has been developed, using selected trace element analyses, which may be used at an early stage in exploration to distinguish ironstones with high potential for gold mineralisation from barren ironstones. The critical elements recommended for routine analysis are Au, Pb, Bi, Mo, Cu and zn. Gold requires accurate analyses at low levels, down to 1 ppb. The AAS-carbon rod technique on 20 gm samples is recommended. The other elements also require lower detection limits than normal, down to at least 2 ppm. The principal criteria are; 1. There is a consistent positive relationship between gold and lead in all ironstones. Truely barren ironstones always contain less than 100 ppb gold and less than 20 ppm lead. Ironstone intersections which contain gold from 100 ppb to 1000 ppb and/or lead from 10 ppm to 200 ppm may represent the halo around a gold pod, and therefore require follow-up drilling. 2. Ironstones with greater map 20 ppm Pb and zinc numbers in the range 0 to 10 have high potential for associated gold mineralisation. 3. Spidergrams of multielement sets from ironstone intersections provide a very useful way of assessing the gold potential of an ironstone. Gold-bearing ironstones show a consistent pattern which is quite distinct from the barren ironstones. Using the above criteria on the set of 13 weakly mineralised and "barren" ironstones investigated in this study, the Navigator 7 prospect stands out as having very high potential for a gold pod.

Item Type: Report (Technical Report)
Publisher: University of Tasmania
Additional Information: © 1987 University of Tasmania
Date Deposited: 28 Jul 2009 05:11
Last Modified: 18 Nov 2014 04:03
URI: http://eprints.utas.edu.au/id/eprint/8935
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