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The North Couloir of Mt Sill can be reached via Glacier Notch, which is the notch between Mt. Sill and Mt. Gayley. Glacier Notch is reached by crossing the burgeschrund of the Palidase Glacier and climbing the steep gully between Sill and Gayley. Once the notch is gained, head southwest and climb the large, snow filled gully(North Couloir) to the gap between Sill and Apex Peak. From this gap, traverse across the north face about 100 feet to a steep chute. Climb straight up this chute to the northwest ridge. From the ridge, climb the large blocks on the northwest face to the summit.
Ice axe, crampons, helmet.