A steeply inclined square shaft approx. 120’ deep intercepts three levels, bottom blocked and upper unsafe. Middle level with nice flatrods emerges to daylight after constriction. Surface location of deep adit unknown*. The extremity of the Bwlch y Plwm adit is not far from the property boundary and there were plans to extend it to drain Catherine and Jane Consols.

Forestry which made this area difficult to explore is now gone. *Hence, the Deep Adit, although now easy to find, is neck deep with orange water.

• 1825 started work as Penyrallt. Lease held by Mary Jones, Cefn-trefor.
• 1938-1939 159 tons of copper ore sold at Swansea.
• 1855 Changed name to Catherine & Jane after its two lady lessors. R.M. Roberts and A.B. Callendar agents for the new company. £24,000 worth of lead ore raised.
• 1856 ‘Auriferous quartz’ reported (a bad sign!!). Under new mine agent Capt Treweek, 110 tons of iron ore sent to Blaina Ironworks. Tramway to Ffestiniog Railway mooted.
• 1858 Under new agent, Richard Harry, Iron export ceased. Deep Adit cleared with disappointing results equivalent to 1/2 inch rib of galena.
• 1859/60 12 men commence sinking a shaft and new levels. Engine house constructed. Engine begins operation.
• 1861 Levels prove to have poor ore. Mine and machinery auctioned off.
• 1862 Shareholder meeting vote to suspend company.
• 1865 Acquired by John Bigland, Sons & Jeffries with a view to working the mine.
• c1871 Samuel Wilkes takes interest in iron deposits - wanting to work together with Bwlch y plwm, which would be used to unwater the workings at depth.
• 1873 Acquired by Wilkes, but sold to Catherine & Jane Lead Mining Company which shared his address.
• 1875 Winding up Petition
• 1877 Felix Mine Company attempted revival that came to nothing.

During 1846-1861 2,652 tons of lead and 840 tons of magnetic iron ore raised.

Workings in forest above Ffestiniog railway near Penrhyndeudraeth.