Hi Cash15 grams/tonne Ag equates to USD as follows: 15/31.103 grams per troy oz = 0.48 oz Ag/tonne
Ag price $15/oz so silver value per tonne USD 15*0.48 = USD 7 per tonne.
This is based on 100% recovery however one would reasonably expect based on these numbers that Ag credits would add minimum USD 5/tonne to revenue.