I agree Grub... ETC is undercover and there's been a lot of work on it for obvious reasons IOcG
The latest Ann's ironstone outcrop signals more sulfur smoke... it means we're closer to a redox boundary, but how close?
Here's a repost of a Mt Isa redox boundary, check my pointer for 50% ironstones and it's correlation with high gold...
Chemical and thermodynamic modelling shows that the contact zones between magnetite- and hematite-rich alteration is highly favourable for the formation of higher grade copper-gold mineralisation (Bastrakov et al., 2007). Such redox gradients also appear to be important in the high grade gold-copper-bismuth deposits of the Tennant Creek district, where both magnetite- and hematite-rich deposits are present in association with chlorite ± sericite alteration (Wedekind et al. 1989; Skirrow 2000). Therefore, the most attractive copper-gold exploration targets identified in Figure 5.3 are those relatively small bodies (e.g. <15 km width) where exceptionally dense and magnetic material (magnetite ± pyrrhotite) is laterally or vertically in contact with exceptionally dense bodies of low magnetic susceptibility (e.g. hematite ± pyrite ± copper sulphides).https://www.researchgate.net/publication/334625939_Producing_magnetite_and_hematite_alteration_proxies_using_3D_gravity_and_magnetic_inversion_method_and_results_for_the_Tennant_Creek_-_Mt_Isa_Project_northern_Australia
Poet
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