Dark-grayish flat like object, in the skies for approximately 10 seconds.On October 29th, 2016, at approximately 1030 hours. I was out on the fiel, with my nephew in-law, and shooting arrows at a target, when I noticed a dark grayish, round, flat object and the size of a plane from nose to tail, in the sky above us. The object was moving north at a speed greater than that of a passenger plane. Once I saw it, it flew for about 10 more seconds, and then it disappeared. There were no clouds in the area, only to the far west.On these sightings, I only had my low quality phone, and unable to get a good picture of it and I don't have a camera. When I did take it with my phone, it was to blurred, and unable to get a quality zoom (looks like dirt on my phone lens). There have been many other sightings on this beautiful, wide-opened reservation and filled with flat area, canyons, and undiscovered, hidden areas. It's friends and relatives that just have no one to tell or report to anyone.