What an interesting story...
The Sydney Morning Herald misspelled (?) the name as 'Maddock' in an 1897 report...
Saturday 12 June 1897 (Source: TROVE)
"At the Newcastle Police Court to-day Captain Maddock, of the barque Mary Moore, was fined 2 pound and one guinea professional costs, in addition to costs of Court, for having assaulted John Webber, boatswain of the barque."
The boat was sold in 1906, the owner at that time being a Mr A. Sweet.
Sydney Morning Herald, Friday 3 August 1906
"SALE OF THE MARY MOORE. The barque Mary Moore, a composite vessel built in 1868 by Messrs. A. Stephen and Sons, of Glasgow, and owned by Mr. A. Sweet, was yesterday sold, though Messrs. Nelson and Robertson, of this city, to the Melbourne Steamship Company, Limited, to be used as a coal hulk..."
"IRON, STEEL & COMPOSITE SQUARE-RIGGED SAILING VESSELS REGISTERED AT SYDNEY"
brings up information about the 'Mary Moore', with a reference to Maddox & Co in the field 'PORTS OF REGISTRY and Owners' (see Key to the Register)
"MARYPORT'68 J.Norman, jnr: b70b75 Norman,jnr: b80b85 J.Norman, jnr.: LONDONb90 W.Montgomery: b98 Maddox &Co: SYDNEYb02 G.J.Robertson: MELBOURNE'04: b10 Melbourne Steamship Co (hulk)"