AB985, MIN71 and AB985 overlap for the years 1911-1955. AB985 goes later and MIN71 commences earlier - that is why both volumes have been retained.
Registers required by legislation. See: Mining Act 1891 Section 8, Mining Act 1900 Section 84 and Mining Act 1905 Section 167.
These records are part of the holdings of the Tasmanian Archive and Heritage Office.