AIr Vent & Lamp House On the left you can see one of the later air shafts for the mine below, which allowed for natural air exchange with the main production areas of the coal mine. That is to say, there were no fans blowing fresh air down below. Related Similar Images ...based on the tags: green, mine-shafts, rooftops, towers, trees, vents... Taken at a junction in the tube world. Gopher Ordnance Works, aka the U-Lands, is a landscape where roots and boughs break apart concrete and steel. A rusting disconnect gangway. The smokestack is for a boiler, if I recall. A row of security lights line the roof of the power station. A self portrait on a tire swing outside the Service Building. The UP gets a lot of snow, making exploring its old mines a special challenge in the winter. The snow is more than 6 feet deep in this picture, and firm enough to walk on. The end of the peninsula where Consolidated D was built, aka General Mills A, used to hold a Northern Pacific freight depot. These are part of the ruins of it. Bits of pulp hang from a rough grate on the first floor of the plant, which was dark because all of the equipment blocked the light. This is a grate picture. Iron becoming dirt becoming birches.