The target for ore extraction was an east-west vein with a slight “Z” bend, extending from the southern end of the Caminches vein. All that remains of Coom Mine are some shafts and a well preserved steam engine house ( winding) from the last stage of 19th century mining.
A BRIEF HISTORY
| 1842 | (- 1843) Trials, but none successful. | |
| 1870 | Mine opened by the new Berehaven Mining Company, Two shafts are sunk, named after Bewley family (of Dublin) board members. | |
| 1872 | Surviving engine house built and 28″ steam engine erected. | |
| 1875 | Mining suspended and mine closed after £ 12,000 spent to extract only 70-80 tons of ore. | |
| 1880 | A decision made to reopen the mine. | |
| 1882 | Closed again. | |
| 1917 | Mine dewatered by future owners, Allihies Copper Mines Ltd, but only 2% ore found. | |
| 1957 | Diamond drilling by new Emerald Isle Mining Company. |