Analysing terrain data
The exposure grade does not take into account objective hazards (stone fall, seracs, etc) but only the consequences of the skier falling.
Low Exposure (E1): Exposure is limited to that of the slope itself. Getting hurt is still likely if the slope is steep and/or the snow is hard.
Medium Exposure (E2): As well as the slope itself, there are some obstacles (such as rock outcrops) which could aggravate injury.
High Exposure (E3): In case of a fall, death is highly likely.
Extreme Exposure (E4): In case of a fall, the skier faces certain death.
A prominent rocky buttress offering numerous lines, A-Basin Buttress, which locals call Little AK for its similarity to large Alaskan spines, is for experts only.
The top of A-Basin Buttress is guarded by a few trees, which protect the entrance from cornice buildup.
The steep run falls away over the edge, with only the tops of small alpine firs visible from the entrance.
In good snow conditions, its possible to ski vertical spines over this rollover.
A narrow couloir runs diagonally along the bottom of the buttress, and can be accessed from the upper left.
Access from either Southback gate along the Throne ridge bootpack.
Traverse around the back of the Throne to Avalanche Basin (A-Basin).
Continue along the traverse behind this prominent feature and sidestep or boot back through the thin trees to the top.