A complex of lead mines and trials is at the foot of a rocky slope on the W side of Llynnau Gamallt. One of the levels (nprn 536585) is marked on the 1891 OS map, and some of the trials may also be of the C19. There were further developments in the C20, apparently by the Union Mining Co c1920, when other levels were driven (nprn 536600, 536603, 536609, 536612) to test the vein. There are small spoil heaps (nprn 536610, 536613) and buildings (nprn 536608, 536611), but no transport infrastructure to indicate commercial exploitation. Most of the evidence here is in the form of prospecting trenches and pits (nprn 573, 536574, 536575, 536576, 536577, 536578, 536579, 536580, 536581, 536582, 536584, 536596, 536597, 536602, 536604, 536605, 536606, 536607, 536614).
JR Foster-Smith, The mines of merioneth (1977), p 11.
D Bick, The old copper mines of Snowdonia (2003), p 134.
Recorded as part of RCAHMW Uplands Initiative Project, R Hayman, H & H, 14/03/2014.