Tiny quarry. Surviving structures include a vestigial adit, two dressing sheds for processing the slate, a building possibly used as a smithy, and a powder house for storing explosives. Interestingly, there is also evidence of 20th-century power-drilled holes and small-scale reworking, indicating that the quarry saw sporadic or limited activity long after its original development.

The Tal y Fan Quarry appears to have been a primitive, tiny operation, possibly originating as early as the 16th century. Its scale was minimal throughout its working life, consisting primarily of just two small quarry faces and an underground trial working, suggesting limited output and resources.