The land is frozen about 8 to 9 months of the year. There is a 4 week "freeze-up" and a 4 week "break-up" transitional period in the fall and spring.
I doubt very much if the oil companies would allow you to transit any of their property, due to the intense scrutiny they are under (originally by environmentalists, last 2 years by the Homeland Security people). When I was up there, I was a guest of an oil company, I indicated to my hosts that I wanted to see what the land was like, and my hosts said "let's take the plane and look, it's simpler that way."
My recommendation: Forget about it.
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