A formerly blocked long adit emerges near the old mill on the river bank. At the base of the wooded hillside are a series of inclined open stopes, up to around 80 ft deep, which connect with the Deep Adit. Some of these stopes are blind, while others are awkward and potentially hazardous to descend. The upper stopes can be descended to adit level, though care is required due to loose rock.

Nearby is a stone-lined shaft, reported to descend via 70 ft and 20 ft pitches to a passage blocked in both directions, one of which is believed to have connected with the Deep Adit. The Deep Adit itself was reopened in the early 2000s.

• c1550 Commenced as part of Beddgelert Estate
• c1750s Deep Adit driven. 20 men underground. Stamps and dressing plant above ground
• 1802 Owned by Thomas Jones, Bryntirion
• 1800s Mill offered for let as woolen mill
• 1830s Sold
• 1838 Brynfelin Company
• 1851 Operating in small way after period of closure
• 1861 Brynfelin Copper Mining Company Ltd. Engine shaft sunk 6 fathoms below adit. Closed due to lack of ore.
• 1864 16 tons of ore raised - possibly from dumps
• 1875 Mine offered on the market with various items of plant.

See separate Adit entry for details on the adit.