Hi Shadowboxer1,
The Roseby native copper deposits have a bulk density of less than 2.2, see asx release 3rd July 2012 (http://www.altonamining.com/static/uploads/documents/Blackard_03_July_2012.pdf).
Not much less than 2.2 I'll grant you, but less all the same.
I'd say the whilst rocklands ore is much, much more vuggy than Roseby, it has a hell of a lot more NCu. In very general terms, I would expect high-grade Rocklands NCu ore to be much denser than Roseby, but low grade Rocklands NCu ore to be somewhat less dense, probably <2.
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