UFO Sighting in North Plains, Oregon on June 14th 2015 – silver disc like object entered view from the south, heading NE altitude lower then normal aircraft usually observed in area

My roommate screamed for me to come out and look, I came of the house first and observed a symmetrical disc or maybe birthday cake shaped object. This object was gleaming metallic and was moving steadily.. I observed for 10~ seconds or so before I determined it was unusual and ran back in the house to call for my other roommates to take a look.. It traveled in a North Eastern direction and I lost it behind some tree's. Before I lost visual I watched it wobble a bit then bank at about a 35 degree angle towards the earth where it dropped altitude slightly and I lost it behind some nearby tree's. My feeling was it was some kind of drone or unusual aircraft, but it made no noise.. The camera did not pick it up that well but I could see it pretty good and it did not look like anything I had ever seen before.