RE: (Cu) CONCENTRATE29 Nov 2020 20:00
If you want to estimate the mass from an assumed volume then you need to use the concentrate bulk density not the mineral specific gravity. Its particle size dependent but you can, as a rule, at least half the weighted average mineral sg. The copper concentrate example in the link below has a bulk density of 1.8 t/m3 (1,800 kg/m3) and is 24-30% Cu.
You then also need to correct for the wet weight; concentrate is filtered, but not dried, to remove most of the water from processing but it still contains a significant proportion, say 10% .
https://www.teck.com/media/Andacollo-Copper-Concentrate-SDS.pdf
So, ideally, you need the dry weight and assay to calculate a cargo value or the wet weight, moisture content and the assay.