UK Grid Reference: SH735268
Latitude: 52°49'24"N
Longitude: 3°52'39"W
A small mine dating from around 1830, Tyddyn Gwladys was first worked as a lead mine, galena is the dominant ore mineral and carries higher silver values than elsewhere in the district although the lode also carries zinc and copper minerals in addition to pyrite, arsenopyrite and some gold.
Tetrahedrite is locally common in polished sections of galena, and occurs as <1 mm) masses intergrown with pyrargyrite, chalcopyrite and rare low-fineness electrum (Mason et al., 2002).
Worked only intermittently, the recorded output is 12 tons of lead in 1848, 9 tons of lead in 1851 and 43 tons of gold ore producing 7 ounces of gold in 1899, the latter being the final year of working.
refs:
Goldmining in Western Merioneth, T. A. Morrison (undated)
The Gold Mines of Merioneth, G.W. Hall (undated)
Mason, J.S., Bevins, R.E. & Alderton, D.H.M., 2002. Ore Mineralogy of the mesothermal gold lodes of the Dolgellau Gold Belt, North Wales. Transactions of the Institution of Mining and Metallurgy (Section B, Applied earth science), 111, B203-B214.
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