Western zone drilling results .43%, page-8

Not sure if you want SG itself outlined or the number used so I'll do both,

Specific Gravity, it is an equivalent density relative to water.

Water = 1 (1 tonne/m^3), so more dense items will have a higher value.

Cobalt and Copper themselves have a much higher density or Specific gravity (both close to 9) than that used (around 2), because they only make up a small proportion of the material (around 0.14% Co and 0.50% Cu) by volume, so the rest of the material will probably be a little less than the actual SG to compensate.

The SG is used to convert a Volume (m^3) to Weight (tonnes), you could use density but it will give you kg's/m^3 so it saves some 0's on the end needing to be removed and extra numbers plugged into the calculator.

An average Copper ore SG I think can be around 3.0, but for this mineralisation I have been told it will be around 2.3-2.4 (this was based loosely on similar DRC ores and I just checked again and had them remembered wrong, so numbers above should be a bit higher), this number could definitely be wrong (but I feel is very much in the ballpark) and it will be something Borg and the drilling team will be having tested soon so the tonnage can be worked out at some point.

I'm also not sure about how deep the resource extends, prices would probably need to remain high or grades better to ensure profitability at this depth, but that is many, many years off and much needs to be proven and happen in the meantime.

Using the SG I have been told:
33000 * 6 * 100 * 2.4 =47.52 Mt, I think is a reasonable estimation for what we could eventually be looking at. This is comfortably above a minimum number required to proceed tonnage wise.

In my opinion simply having 20Mt comfortably proven (which appears likely if Co/Cu is found throughout) is the main goal. Any higher grade zones found with this drilling campaign will be targeted in the next drilling phase.