I supose that the number of trucks for the nickel ore will not be very many, the ore apparently would be concentrated on location of mine.
Once the railway is in place those trucks would be still used to deliver same ore from Eagle mine to rail head but by that time Noront's chromite will also kick in so it just may be that more trucks would be needed.
I do not know for sure, just guessing.

As for storing nickel ore it would only be until winter freeze up and then transported out on winter road, assuming all season road not available by then, Ed.