article from the bulletin, page-2

Thank you for posting the AusIMM article marchelo , very interesting reading .
Of note is a couple od paragraphs about Prominent Hill
"Haematite breccias are generally confined to the sequence of greywacke and sandstone and the volcanics to the immediate south. They are highly variable in composition and texture but invariably contain haematite as a matrix component. Matrix varieties include dark grey, blue-grey, purple, red-brown, jet-black or steel grey haematite. Quartz, copper sulfides (chalcocite, bornite, chalcopyrite), carbonate and fluorite are also common matrix components. The haematite breccias can be subdivided further based on variations in grain size of the matrix components (in particular haematite).

Disseminated copper mineralisation is generally most abundant in (dark grey to black) crystalline matrix haematite breccia. They are ‘high-energy’ fluidised breccias characterised by a relatively coarse grained haematite (-sericite-quartz- fluorite-carbonate) matrix and commonly exhibit a wide variety of clast types, including greywacke, altered andesite to basalt, haematite breccia and haematite rock of unknown precursor. Textures vary from milled to compositional layered. Embayment of haematised or sericitised clasts is common. They have a high matrix percentage and are correspondingly high in Fe, REE, Co, U, Cu and Au."

Now go and read the announcement from TAS on Nov 23 , interesting comparisons