A small mine working for copper ore in black shales of Silurian age associated with felsite dikes, somewhat similar to the important Parys Mountain copper mines to the west.
Mineralisation included quartz, chalcopyrite and other copper minerals together with much pyrite. Additionally, gold occurs as a trace metal (Greenly, 1919). Overall though the copper grade was low, averaging only 1.2%. A specimen of copper from this mine is held in the collection of the National Museum of Wales.
The mine was active 1827-32, records showing 144 tones of ore producing 10 tons of copper valued £746. The final workings were between 1917-25 when the mine reached a depth of 100 feet below adit. The only output recorded during this period was 80 tons of ore in 1917.
Ref: British Mining Number 4, The Mines of Anglesey and Caernarvonshire, J R Foster-Smith, A Monograph of the Northern Mines Research Society, 1977.
Greenly, E., 1919. The Geology of Anglesey. Memoirs of the Geological Survey of Great Britain, 980pp (2 volumes).
Much of this small site is heavily overgrown, but very small unproductive dumps remain together with walls from the mine buildings and at least two shafts, one appearing blocked, the other flooded.
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UK OS Grid Reference: SH483905
Map Reference: 53°23'21"N , 4°16'53"W
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