The Broncos have made a series of roster moves after their weekend rookie minicamp, including re-signing a player they waived one week ago. The club announced Monday it had re-signed safety Charles Mitchell, with whom it had parted ways on May 12. However, Mitchell tried out at Denver’s minicamp and has now been re-added to the roster. The 5-foot-11, 205-pound Mitchell has appeared in 10 regular season games, all with Atlanta in 2012. He was a sixth-round pick of the Falcons two years ago. The Broncos also announced the signing of two rookies: wide receiver Greg Hardin and linebacker Chase Vaughn. Hardin played collegiately at North Dakota, while Vaughn has had stints in the Arena Football League, Canadian Football League, Indoor Football League and United Football League since 2010.