I wasn't familiar with this particular loco but it seems to be a generic Bagnall 0-4-0ST.
They don't have the same recognition as the Hunslet "Quarry Tanks" but were much more numerous in their day, being sold to contractors and mining railways the world over in various gauges and sizes.
The larger outside-frame four-coupled saddle tank design, locos like the Penryn "Ladies" and Darjeeling Sharp Stewarts, seems to have been overtaken by the late 1800s with main-line locos becoming larger and longer, and inside-frame saddle tanks like the Bagnall and Kerr Stuart types, or the well-tank designs from Borsig and O&K dominating the market for small contractor's and working-level locos.
''the stopes soared beyond the range of our caplamps' - David Bick...... How times change .... oh, I don't know, I've still got a lamp like that.