Cambrian Manganese Mines Co.
Llanbedr
| 1917–1922 | Cwm yr Afon | |
| 1917–1922 | Dolbebin | |
| 1917–1922 | Foel Wen | |
| 1917–1922 | Llyn Eiddew Mawr | |
| 1918 | Crafnant? | |
| 1918–1922 | Coed | |
| 1918–1922 | Lletty Walter | |
| 1919–1922 | Bronwen | |
| 1919–1922 | Penarth |
Referred to in some sources as the Cambrian Manganese Co.
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