Remaining 1815 ton estimated gold/silver content
First of all, the length of drift mined to acheive 1815 tons is ~ 60 meters (@ 3.3 tons/meter3 or 30 tons / running meter of drift) This appears to be approximately where the cleopatra vein enters the drift in Pretivm's presentation drawing.
I have a hard time to visualize how something being called a vein can be any less than 1mm thick (of solid electrum) so I used this thickness in my calculation.
density of electrum = 15 gm / cm3
gm of electrum = 6000 x 300 x 0.1 x 15gm/cm3 = 2,700,000 gm
electrum = 66% gold 34% silver
Oz of gold = 2,700,000 x 0.66 / 31.1 = 57,300 oz
Oz of silver = 2,700,000 x 0.34 / 31.1 = 29,500 oz
add to this an average grade of ~ 1oz electrum / ton of the 1815 tons remaining sample
Oz of gold = 1815 x 0.66 = 1200 oz
Oz of silver = 1815 x 0.34 = 617 oz
Estimated total gold = 57,300 + 1200 = 58,500 oz +/- 250
Estimated total silver = 29,500 + 617 = 30,117 oz
Seems outrageous but numbers don't lie!