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Powys Metal Mines Survey
Siglenlas
Siglenlas lies in the community of Llangurig in the county of Powys. It is located at Ordnance Survey national grid reference SN86588390. The mine is recorded in the CPAT Historic Environment Record as number 8478 and this number should be quoted in all correspondence.Lead/Copper (Prehistoric ?/Roman ?/17th century-1868)
Geology
Silurian Frongoch formation mudstones. There are three lodes, the main vein striking SW-NE. The vein includes a quartz chalybite and calcite gangue with galena, sphalerite, and chalcopyrite.
Workings
There are a number of ancient opencuts on the lode displaying traces of copper mineralisation. Trials are also located on this lode. The main workings of the 18th and 19th century were carried on by means of a single shaft and 2 adits at SN86628397.
Transport
No evidence.
Power
In 1865 a waterwheel was used for pumping and crushing but was apparently unsuited to provide power to both. Traces of this wheelpit survive. The wheel was fed by a leat from a reservoir at SN85208470.
Processing
A rotary rake, 2 machine jiggers, and a crusher were present in the 1860s. The wall of a possible set of ore bins can be seen on the 1886 OS map to the east of the crusher.
Other features
No evidence.
This HTML page is reproduced from the Powys and Clwyd Metal Mine Surveys which were undertaken between May 1992 and December 1993 by Mark Walters and Pat Frost of the Clwyd Powys Archaeological Trust with financial support from Powys County Council, Clwyd County Council and Cadw: Welsh Historic Monuments. Further information about this site is available in CPAT's Regional Historic Environment Record.
Page produced by Rachel Stebbings and Chris Martin.