Is this your David MUTTON? Age at arrival in SA c20 years.
From Biographical Index of South Australians 1836-1885 - not always 100% accurate and there are errors and omissions.
MUTTON David - Parents David and Elizabeth nee MAY.
Born c 1836 Cambourne CON ENG. Died 20 Aug 1905 Wallaroo Mines SA. Buried at Kadina. Arrived 1857 TANTIVY .
0ccupation Miner. Lived at Burra, Wallaroo Mines. Religion Church of England.
Married 27 May 1862 Kooringa SA Mary nee SHEAHY, parents Patrick. Born c1835 IRL and died 10 Aug 1900 Wallaroo Mines SA.
Children - John [1863-1881] Mary Jane WEBB [1864-1937], Susan Ann [1866-], Julie [1869-] Emma [1871-1950].
Cheers
Cando