"I wouldn't bother." Both you and mattyedw have the missed the point. My original Excel calculations for the value of an underground orebody may be used as a template for additional data or even other mining companies. For shareholders to make informed decisions we need to be able to compare proceeds of ore sales to costs. I intend to create a similar template for costs but will not post as I am not getting any assistance here. I chose the Morning Star Mine because most of the variable already exist (infrastructure and mill) and am a shareholder.