A1 Mine Settlement is a town in Victoria, Australia, located north of Woods Point on the Mansfield - Woods Point Road, in the Shire of Mansfield. The town has also been known as Castle Reef, Castle Point, and Raspberry Creek. A receiving office opened here on 1 July 1910; it was later upgraded to a non-official post office and closed on 9 March 1967. The A1 Mine has historically produced in excess of 450,000 ounces of gold and was one of Australia’s longest operating mines having been worked from 1861 through to 1992.