Hard Rock Hopper Looking into the mouth of the hopper which mine carts dumped into at the top of the Concentrator. Related Similar Images ...based on the tags: blur, grates, rocks, wooden... One of the many small treasures hiding in the mill… Looking through the trestle toward the ghost town. Chester Creek Infall, near Duluth’s old Armory. The creek will not emerge again until it is near the Lakewalk. Bricks from the demolished buildings. Upper Prize Street in Nevadaville earned the nickname ‘dogtown’ when a pack of dogs took over the abandoned houses. Below Grand Army Mine is Gold Collar. A ‘collar’ is the braced section around the portal of a mine shaft. This building had the rusty remains of a few mattresses, likely used in the 1940s when this site was last occupied. Two bin signs criss-cross in the North Annex. The side of the main elevator, severed by “Woodchucks”.