Many thanks for the heads-up!
There's a vast amount of material been placed online: Min. Stats. and successors to present; List of Mines (though 1888-1896 not available); various H.M. Insp. Mines publications (but not divisional reports); Geol. Svy. 1in / 1:50,000 sheet memoirs; Sp.Reps.Min.Res.G.B. memoirs; lots of other Geol. Svy. series and misc pubs; 1in, 1:50,000 and 1:25,000 Geol. Svy. Maps (but not 6in maps).
Wonderful resource!