I have been going through my considerable collection of specimens (all labelled and wrapped)gathered over the years and waiting for me to have time to study them carefully. I had visited the Nadbuck mine many times during the 1970's when it was being worked by a colleague of mine, Peter Black, and his business partner,Brian Paul. I found among the specimens from that mine, a piece that I had labelled "Grey Copper Ore". When I observed it carefully, I could see that the older surfaces were all purple, freshly broken surfaces revealed a black-grey crystalline material abounding in small pyramidal shapes (whether crystals or cleavage I cannot tell),but appearing to have tetragonal symmetry. I could detect at least two excellent cleavage directions,hardness was between 3 and 4 (Mohs),brown streak. Small fragments,free of other mineral dissolved readily in dilute ammonia solution giving a strong blue coloration. I believe this points to Paramelaconite rather than Tenorite or Cuprite.
The vivid emerald-green transparent material, which I had previously assumed to be Malachite, showed as having a vitreous lustre and some "matchbox" shaped crystals which could be tetragonal or orthorhombic, there appeared to be two good cleavages and conchoidal fracture. Small selected pieces did not effervesce in dilute HCl. I think this material is probably Euchroite. (There is Malachite and Azurite present in places as well and the matrix is sheared quartz).
I hope to contact Brian Paul and the Broken Hill Mineralogy Club for more confirmation.