Daylight sighting by hikers at Mayflower Gulch outside Leadville witnessed in Summit County, Colorado

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On Thursday July 25 my girlfriend and I we hiking in Mayflower Basin south of Co 91. We were up in the basin and Helen had gone ahead to the foot of the basin. I was about 100 yds off the three miner log cabin remnants sitting on a rock enjoying peanuts and water when, looking west, I saw a very large brown biped approach the snow wall / cornice and seek to climb it. The biped was unable to climb up over 20 feet, moved back down laterally to its right, and then down to the ground off the snow. It then walked on two legs very briskly to the right, subsequently out of my view. About 4-5 minutes later a hiker with his dog came walking down the trail. And I later saw this brown biped from time to time walking above the snow cornice southbound. Did not see it again. Helen returned to me, we discussed, then walked down to the locked gated prohibiting cars into the basin to talk with the hiker. His name was Robbie, his dog, Dallas. We agreed to scale up the trail to where I had seen the br...