Coming down the East Fork into Mineral we spent quite a bit of time gawking at the impressive slides over in the GB No/Barrieto area. Skiing was good with minimal wind affect in most of the sheltered W and NW aspect slopes. As we neared the bottom of the drainage there was a slighty more open slope with just a touch of south aspect off to skiers left that I went to check out to see if there had been sun affect from the afternoon before. This is small terrain, somewhat steep in the starting zone (40ish) just below small rock band, but then flattening out quickly below. To my surprise as I got over there the ssw aspect at the bottom of this drainage seemed to have a bit of hard wind slab on it. I was traversing fairly high on the slope but it fractured about 5 feet above me and propagated 30 feet wide or so. I was knocked off my feet and carried about 30 feet downhill and stopped sitting on the debris. No terrain traps present. I did have a chance to yell and my partner and another party in the area had eyes on me. This was as big of an avalanche as this terrain could have produced and was not really scary at all. However I will say that I was surprised at the presence of the wind slab in that area and it made me think that the winds from the night before could have made pockets of wind slabs in some other unusual places as well.