Two Box bushes in FOD, doubt its the first.
Box Bush Iron Pit at SO574108 was a shaft close to centre of Coleford. This flooded and was an expensive failure cica 1809.
Box Bush Trial slope at SO 571104 Trial drift driven 1891, driven 80 yards with a heading of 300 yards long, only produced 100T ore.
There was a Waterloo Colliery near Lydbrook at SO609151 opened 1850 closed 1959 so that goes with your enquirey.
In 1949 it was flooded by breaching East slade Pit trapping 5 men. Colliery most productive in early 1900s due to adjacent draining of Cannop Colliery. suffered several spontaneous combustion fire prior to closure.
Hope this Helps
Regs ICLOK
Aaaaaaaaaaaaaaaaaaagh Creeper!!!!!