Latest calculations of the ore-bearing coefficient in the Plavica deposit for gold and
copper displayed values of 0.441 for gold and 0719 for copper, which means that within
the deposit only 55.9% and 28.2%, respectively, of mass is not mineralized somehow.
The calculated value of variation coefficient (V) has shown value of 271 for the gold
and 130 for copper, which displays that this ore body belongs to the group of deposits
with extremely uneven mineralization. An average gold and copper concentrations were
determined as 0.336% Cu and 0.85g/t Au. Minimal economic content (MEC) within the
Plavica deposit, was determined as 0.217 g/t Au and 0.264% Cu. In similar manner was
calculated the lowest copper boundary (cutoff grade), which have shown value of
0.156% Cu and thus allowing certain decrease of contents in exploited ore. Also, there
was calculated so called copper monometal value, which included influence of the
present gold in the ore and it was set at relatively fair 0.371% Cu that represents solid
mainstay for exploitation of copper in these low percentage ores
