Check out Dave White’s site for great info on refining times and ore value in eve. A must review for miners interested in the value of the pay load: http://davewhite.net/eve/minerals.asp

Use his calculator to customize the results: http://davewhite.net/eve/changecapacity.asp

Also check out evegeeks refining calculator for a break down on mineral refinement and the overall price per: http://www.evegeek.com/orecalc.php