Ann: Spectacular Copper Discovery - Greater Duchess Project, page-163

I don't normally respond to your rubbish but before you attempt to give other posters on this forum a "lesson in geology" it would advisable to note that disseminated and semi massive sulphides are typical and the order of the day in Eastern Mt Isa belt orebodies and especially IOCG and ISCG, it is fairly typical of Osborne, Starra, Mt Elliot, Trekelano and Ernest Henry deposits to contain mostly disseminated and some massive sulphide orebodies, the rule of thumb being once you get up to 3% Chalcopyrite that often translates to copper grades at 1% or better, and by that stage its also typical to have reasonable gold grades in ratios of 0.3 to 0.5g/t Au per 1% of Cu.

If you want solid sticks of chalcopyrite without any other gange minerals let me know where you see them, because in Copper deposits they aren't very common.