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From his AIF papers, David Thornton COLLINS, born Allora, Qld, enlisted 31 July 1916, was a Coal Miner, and had been a Blacksmiths apprentice. He had also been a Queensland Policeman for 6 years. He was a married man, and his wife was his next of kin. She was Lucy Ann COLLINS, c/- D T Collins, Tank St, Lithgow. NSW. From those papers it is clear that David Thornton COLLINS did move to Lithgow. There's quite a number of pages in his AIF papers, including a sick child brought to Sydney Hospital from Lithgow, during WWI, and there's some legal correspondence from the late 1940s.
http://discoveringanzacs.naa.gov.au/browse/person/66884 Cheers, JM