Ann in 1932, the property was sold and subsequently used as a dairy. It changed ownership again in 1935, then used for sheep grazing. The new owner removed everything of value from the property; slate paving and benches were sold, buildings were stripped to walls and foundations, pine trees lining the entrance road were turned to box wood and some outbuildings were knocked down. Most remaining plants and fruit trees from the property's nursery days were destroyed by bushfires during Ash Wednesday in 1983. The ruins of Newman's Nursery consist largely of foundations and walls and are listed on the State Heritage Register. Mining and quarrying dolomite, sandstone and quartzite rock have been extensively mined in the park. Though traces of silver, copper and gold are present, there have been no economic finds. The park is scattered with many quarries; the largest within the park is an open-cut in the northwest corner. It was in operation until 1982 supplying stone for buildings, including Adelaide's war memorial and St Peter's Cathedral. Tea Tree Gully Freestone from some quarries has been used for the facades and ornamental dressing of many of Adelaide's Victorian public buildings. Adelaide Town Hall, the General Post Office and Supreme Court Buildings in Adelaide were all built entirely of this stone. The quarries supplied dressing stock for ornamentation on buildings, including St Peter's Cathedral, St Francis Xavier's Cathedral, Flinders Street Baptist Church and the University of Adelaide's Mitchell Building. An ironstone mine was opened to work on a rock outcrop in 1853. The mine was to supply flux for the Port Adelaide copper smelting works, but it apparently closed within a year. It was reopened in 1861 and operated until 1862. The Tea Tree Gully Silver Mining Company began work in the area in 1888, constructing a tramway, blacksmith shop and a new road. With no economic finds, the company closed in July 1889. The quarry, in Water Gully adjacent to the nursery's ruins, has been mined for blue dolomite, some of which was used for the nursery's buildings. Quarries elsewhere in Water Gully were opened in the 1880s and intermittently supplied quartzite road metal for the District Council of Tea Tree Gully. A crushing plant was erected on the north side of the gully in 1912 to create this road material. When the park was proclaimed, land zoning regulations allowed existing mining prospecting rights to continue. These