Skied Patsey Marley early Tuesday morning and did not notice this slide while climbing the ridgeline. Got to work Wednesday morning and noticed wide avalanche from the top of Millicent chair at Brighton. Looks to be skiers left of the Heaven's Gate run off Twin Lakes Pass. Unknown trigger, but this slope had heavy wind activity Tuesday. Hard to gauge width and depth, but looks to have slid on old snow new snow interface with wind loading happening on that slope.