ferreira margins, presentation, rain , page-23

Roidz i think the company can be a bit conservative on the margins that they have posted about PEN and DE-Whitt at a cash cost of $61pt predicting throughout the life of the mine in which DE-Whitt will be operated as an opencast mine for the 1st 10years of its 30 year predicted mine life of which will be cheaper to extract the coal in the 1st 10 years.
But on a 35% margin at a cash cost of $61pt which = thermal coal to be at $82.35pt on that margin.
Correct me if im wrong.