ANCHORAGE -

Alaska State Troopers are recovering human remains from the Koyukuk River this week believed to be those of a 57-year-old man last seen in Koyukuk nearly two months ago.

According to a Monday AST dispatch, a trapper who had checked a trapline and headed back to the village saw the apparent remains of Ralph Silas in the frozen river, about a mile upriver below bluffs in the area. Troopers were first informed of the discovery Thursday afternoon.

“A trooper responded from Galena to recover the remains that are in the process of being transported to the State Medical Examiner's Office in Anchorage for positive identification and an autopsy,” troopers wrote.

While Silas often traveled between Koyukuk and Nulato, he was last seen Jan. 18.

“When residents of both villages realized he hadn't been seen for an extended period of time, he was reported missing to AST on (Feb. 12),” troopers wrote. “It was unknown what direction Silas may have headed, what clothes he was wearing or what equipment he was carrying when he went missing.”

Neither an Alaska Wildlife Trooper flying in the area on Feb. 12 nor ground searches including PAWS search dogs spotted any sign of Silas.

AST spokesperson Megan Peters wasn’t immediately available for comment Monday night.