CANON CITY, Colo. (CBS4) – Another Coloradan is missing while searching for a treasure supposedly buried in the mountains of New Mexico.

Eric Ashby, 31, decided to search the Arkansas River for the treasure, which was written about in a book, but disappeared while rafting near the Royal Gorge Bridge in June.

Eric Ashby (credit: CBS)

Apparently Ashby was in an accident and fell into the water, but no one knew to look for him until his family reported him missing more than a week later.

“We have a great group of professional raft operations. We’ve got a great railroad. They’re up and down that river almost on an hourly basis,” said Patrick Caulfield, with Fremont County Search and Rescue.

The Royal Gorge (credit: CBS)

Two other Coloradans have died while searching for this same treasure, including Grand Junction pastor Paris Wallace and Randy Bilyeu of Broomfield.