still trying to buy cheap shares Ceh.....yet another not holding...

still trying to buy cheap shares Ceh.....
yet another not holding looking to down ramp
please feel free to put up your calcs as I am human and if I’ve made a mistake happy to be corrected. The way I see it is
7000 tonnes of ore mined ( jan presentation)
@ 15% grade = 1050 tonnes of Zn
@  $3900 AU / tonne = $4,050,000 revenue 
less C3 costs at .61 cents /lb US =$1900 / tonne AU
or circa AU $ 1.95 million in costs leaves around $2+ million in change. 
GLTAH 
Cheers Rb