Question: What does the McMahon Services produce in Dry Creek, South Australia?
Context: Sallisaw Creek is a 46.7 mi tributary of the Arkansas River in far eastern Oklahoma.  Its source is between Taylor and Doublehead mountains just south of Stilwell in Adair County.  It flows in a southwestern direction through southern Adair County and central Sequoyah County before it empties into Robert S. Kerr Lake on the Arkansas River.  The creek has four large tributaries.  Greasy Creek meets Sallisaw Creek in southern Adair County, while Dry Creek and Brushy Creek join Sallisaw Creek near Marble City in northern Sequoyah County, and Little Sallisaw Creek flows into Robert S. Kerr Lake as it meets Sallisaw Creek. Sandor (Alexandor) Gallus (15 November 1907 – 29 December 1996) was a Melbourne archaeologist, most famous for his investigations of Pleistocene Aboriginal occupation at Koonalda Cave in South Australia and the Dry Creek archaeological site in Keilor, Australia, which helped demonstrate the great antiquity of Aboriginal occupation of Australia. McMahon Services is an Australian civil engineering and construction company.  It was established at Dry Creek in Adelaide in 1990.  McMahon Services is contracted by governments and private industry for construction and demolition projects in most states of Australia.  These include construction of part of the Northern Connector freeway, and demolition of the Northern Power Station. Wingfield is a suburb situated north of Adelaide.  It lies between the Port River Expressway on the north and Grand Junction Road on the south.  The suburb borders Dry Creek to its north and east, bounded by the Gawler railway line and Adelaide-Port Augusta railway line on the east.  The North-South Motorway and Dry Creek-Port Adelaide railway line both cross the suburb.  Wingfield is named after R. W. Wingfield, the private secretary to Governor of South Australia, William Jervois. The Hundred of Yatala is a cadastral unit of hundred in South Australia covering much of the Adelaide metropolitan area north of the River Torrens.  It is one of the eleven hundreds of the County of Adelaide stretching from the Torrens in the south to the Little Para River in the north; and spanning from the coast in the west to the Adelaide foothills in the east.  It is roughly bisected from east to west by Dry Creek.  It was named in 1846 by Governor Frederick Robe, Yatala being likely derived from 'yartala', an indigenous word referring to the flooded state of the plain either side of Dry Creek after heavy rain. Wycliffe is a neighborhood in east Modesto, California.  It is located on Wycliffe Drive: north of the Dry Creek and south of Scenic Drive.  Wycliffe is situated in the 95355 zip code of Modesto that encompasses a population of approximately 49,379 residents.  Some of the homes in the neighborhoods are enclaved in the cliffs of the nearby stream, across the stream the McClure Country Place and Dry Creek Regional Park and bike/walk trail are located. Dry Creek is a mostly industrial suburb north of Adelaide, containing significant wetlands and a substantial area formerly devoted to salt crystallisation pans, managed by Ridley Corporation, which plans to redevelop the site for housing. Dry Creek or Dry Creek Drain ( ) is a seasonal stream in South Australia which passes through the Adelaide suburbs of Modbury, Walkley Heights and Pooraka.  The nearby suburb of Dry Creek and Dry Creek railway station are named after the stream. Dry Creek is a tributary, 54 mi long, of Crooked Creek in the U.S. state of Oregon.  The creek, which is intermittent, begins in the desert near Five Points in Malheur County.  It joins Crooked Creek east of Burns Junction and about 7 mi south of the larger stream's confluence with the Owyhee River.  Dry Creek drains a basin of about 299 mi2 . Intract Australia is an Australian construction and building maintenance contracting company.  It was established to provide employment and training opportunities for indigenous Australians.  It was established in 2010 as a business unit of McMahon Services, but is now 51% owned, managed and controlled by indigenous people.  Intract will be building the 15km-long shared path as part of the Northern Connector freeway project in South Australia.
Answer: salt crystallisation