OS Ref: Brownley Hill Low Level NY77624465, Gudhamgill Level NY78084499, Gudhamgill Firestone Level NY?
Gudhamgill Mine follows the Gudhamgill Moss Vein and this is where it was worked. There are three levels, which access the mine workings, the Horse Level via the Brownley Hill Low Level (Bloomsberry) portal, the Gudhamgill Level (also known as the Gudhamgill Burn Top Level or Gudhamgill Shop Level) and the Firestone Level. The mine has connections to Scraithole Mine and the Dodd Level, but these are not accessible now.
The earliest records indicate that the vein was worked by a series of shafts along the valley. In the early 18th century the London Lead Company started to drive the Gudhamgill Level. At the beginning of the 19th century the LLC drove the Gudhamgill Horse Level as a crosscut from the Brownley Hill Low Level, this was carried out in an attempt to reach the Great Limestone. The Gudhamgill Horse Level connected with the Gudhamgill Level via a borehole, known as the Borehole Sump on plans. The LLC continued to develop the mine sinking a sump into the Three Yard Limestone where only small quantities of ore where found. Eventually the lease was sold to other companies and in the end ended up belonging to the Vielle Montagne Zinc Company, which worked the mine until the 1930's.