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Summary Report: EPA Internal Review of the August 5, 2015 ... Mid-1900's -- The American Tunnel was constructed below the lowest mine workings in the area (Attachment C: Map of Mine Workings). It runs from the drainage adit discharge point in Gladstone, beneath the Gold King Mine and eventually reaches the Sunnyside mine complex approximately two . Mine Entry Metadata - assets.publishing.service.gov.uk The type of the mine entry; whether the mine entry is a shaft or an adit, is indicated in the TYPE field. If the mine entry is an adit then this has a direction of inclination and this bearing from North is stated, where known, in the ADT_ANGL (Adit bearing) field. Utah County, Utah Mines - Western Mining History County mine maps available to premium members About the MRDS Mines Database: All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should .    Read More