RE:Pentlandite, an iron nickel sulfideThe Pentlandide is inside Pyrrhotite mineral.
Pyrrhotite minerl can contains 5% Ni at 20% of the core diameter surface = 1%Ni max.
To get an average of 0.4%Ni on average, 40% of the core lenght shall have Pyrrhotite at 20% Pyrrhotite in the core diameter surface.like the GOCO picture.
At 100 mters and up with an average 0.4%Ni and over, it can be an economical open pit.
The volume of the deposit have to be determined by drilling