This is part of Graham Levins’ Photo Archive.
Glogfach Mine (SN 747 707) & Glogfawr Mine (SN747 705)
I am combining these two mines as they are very close neighbours. They are the last two of the four mines drained by Level Fawr Pontrhydygroes.

Glogfach Mine 1990
Glogfach Mine 1993
Glogfawr Mine 1993