| Year | Activity |
|---|---|
| 1860 | Copper carbonate reported |
| 1878 | Derwen Deg & Panol Gwyn Copper & Lead Mining Company registered |
| c1880 | Workings 18 fathoms deep |
| 1881 | Taken over by North Wales Freehold Copper MInes & Smelting Co. following favourable report by Prof A.C. Ramsey |
| 1882 | Closed and re-opened as Conwy ValleyFreehold Mining Co. |
| 1883 | 42 fathom level being driven north. Last mention. |
Smmary from Bick
Publications (4)
- (1988); WMS Newsletter Issue 18 May; 12 pages
- Bennet & Vernon (1997); Mines of the Gwydyr Forest, Book 7 - Llanrwst: Coed Gwydyr & Cae Coch, Llengelynin: Trecastell & Derwen Deg
- Bick, D.E. (2003); Old Copper Mines of Snowdonia, The; pp. 121-123.
- NMRS; Newsletter Nov/1981; pp.2-3.
