Union
| Alternative names | Tynllan Tynllwyn Wnion |
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| Location | SH706222? [Hall 2008b] (Area map showing location.) | ||||||||||||
| Parish | Llanelltyd | ||||||||||||
| Owners | H J Wright 1893 Tynllan Manganese Co. 1894 |
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| Production and Employment |
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| Transport | |||||||||||||
| Remains | Level [Hall 2008b] | ||||||||||||
Down [1980: 49] describes the manganese mine as adjoining the gold mine. However, Hall [2008b] describes a manganese level up the hill to the north west of the gold mine.