Eighty-three years have passed since John R. Thornton’s remains were sealed in a mine shaft on Mount Ida. The Salmon Arm prospector’s life is no secret, nor is the trail leading to his burial site, thanks to efforts to preserve both. The trail is unmarked, and hikers could feel out of place at the “trailhead” as it’s frequented by off-road enthusiasts, particularly dirt bike riders who make use of other routes in the area. My wife and I recently…