A steep hike north of Valemount

From BC Parks:

To access the trail leading to Mt. Terry Fox, take the first left heading south from the Terry Fox viewpoint on Highway 5. Cross C.N. tracks and bear left. Proceed past the gravel pit and water spout. Take the second right to a gravel pit. A sign marks the trailhead. This is a very challenging trail that is rough and steep in sections with significant elevation change. Allow 10 to 12 hours round trip.

The best info is found on HikeValemount.com