As highlighted earlier, the confirmation of the presence of "gold flecks" in the core on-show by Robert may indicate the drill bit is actually in an "Ore Phase" (if matrix supported) or "Ore Phase outside breccia body" (if Vein hosted). re: table below. Therefore, past the "Pre & Post ore alteration" zones.
At the Ernest Henry deposit, gold is found primarily as tiny specks within two main areas:
- Shallow Matrix: Gold is closely associated with chalcopyrite (a copper sulfide mineral) that fills the spaces between clasts (broken rock fragments) in the upper part of the orebody. Imagine a bunch of rocks with gaps in between. Gold is like tiny flecks of gold dust hiding within the copper sulfide mineral that fills those gaps.
- Deeper Clasts: At greater depths, where the hot fluids interacted with the rock for a longer time, gold can also be found replacing the minerals within the clasts themselves. So, instead of being in the spaces between rocks, the gold becomes part of the existing rock fragments.
https://digital.library.adelaide.edu.au/dspace/handle/2440/121234
Ernest Henry alteration characteristic matrix - A detail indication of the Cu-Au mineralisation that can be expected in the Breccia and Late veining zones. Refer to the bottom two rows.
https://smi.uq.edu.au/files/36554/Atlas_Prototype_Ch3_ErnestHenry.pdf
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