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The main access was via an old shaft (Olwyn Goch - OS SJ201677) that was enlarged to 12 by 12 ft 6 ins and deepened to 490 ft when the drainage tunnel reached the workings. The bottom of the shaft reached 27 ft below tunnel level.
In 1939, Pilkingtons began excavating large quantities of the high-grade limestone of the mine for glass making, chiefly from the area to the west of Olwyn Goch shaft. Prior to this, Olwyn Goch shaft was chiefly used for raising men and materials, with Pen-y-Bryn Shaft being used for winding ore and materials.
The final shift took place on 10 December 1986. Although the office buildings remain at Olwyn Goch together with a few milling sheds, the headframe and 1930s winding gear was moved to the National Trust visitors centre at the Dolaucothi gold mine in mid-Wales.
Mineral ListMineral list contains entries from the region specified including sub-localities
7 entries listed. 7 valid minerals.
Localities in this Region
The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.