We observed the aftermath of a slide from the Paradise chair at Powder Mountain. It broke off 150 ft wide or so and didnt look to be more than a foot or so deep, it slid about 500 feet down the slope. There was a track going into it so definitly skier/rider triggered and when it slid a lot of rocks were exposed we could not see a track out of the slide path. There was 1 or 2 people standing on the debris moving around but could not tell what they were doing. We reported this to ski patrol at the top of the chair and they got out the binoculars to take a look. I don't know any more than that we were surprised there wasn't a report of it yet.