Block 4F (with the Albany) is in the James Bay Lowlands. That's clearly shown by the 30-40 metres of glacial till and Paleozoic limestone that unconformably overlies the granite bedrock hosting the pipes. I'd assume that 4E, further north, would also have similar JBL strata.
Drilling in wetland environments is best done in the dead of winter. There is no need to construct a drill pad, and most (if not all) of the equipment and personnel can be moved in by sled or quad, instead of by helicopter. The heavier sections of the rig itself might still have to be flown in, though. It depends on the quality of the trail, and the size of rig needed to attain the planned depths.
The only other issue is access to water, to cool the bit, but that's seldom an issue up there.
The cheapest drilling is winter drilling, typically. If they don't get it done before the ice starts to break up, they likely can't drill again until May-June. And then they're going to need a helicopter and a drill pad, and perhaps pads for the camp, too.
Lar
