Hi Fleurieu
:)My mother's maiden name was Mutton. Have been researching and trying to sort this family for many years (among others). Mum's school friend, Gwen Harvey, (Wallaroo Mines) always believed that they were related and I am trying to sort it out. The Gwen is from Eliabeth Mutton and George Canty. My mother is from Edith and Joseph Mutton. 
In summary from the records I have seen, Elizabeth CANTY nee MUTTON was the granddaughter of David born c1835 and Elizabeth nee NICHOLLS who married in 1856.
Joseph Eddy MUTTON was the son of Joseph MUTTON born c1855 whose father was also Joseph.
Then Joseph Eddy's grandfather and David (married to Elizabeth MAY) were sons of William and Hannah Staple?
I have tried to analyze all details of this thread but the process of sorting out which David is proving difficult to say the least.
I can see four David MUTTON marriage records from 1854-1866 and
I wonder if one David was married twice?David aged 21 m. Kapunda 1856 to Elizabeth NICHOLS aged 21 – only two children recorded at Kooringa (Burra). Problem is what happened to Elizabeth nee NICHOLS?
David aged 27 m. Redruth (Burra) 1862 to Mary SHEAY aged 27 – children also born at Kooringa
Looks to me like this David was the same age??
It appears neither of these are relevant.
David m. Eliza CURR*TS m. 1853 – both died at Yongala
David FL age m. 1866 Kapunda to Mary BIGGIN – children born at Kapunda and Yongala.
I can see two David MUTTON death records and both were born c1835 and both had a wife named Mary.
David aged 64 d. 16 Oct 1899 Adelaide & Mary aged 87 d. 17 May 1926 Adelaide (ex Yongala so not relevant)
David aged 70 d. 20 Aug 1905 Wallaroo Mines & Mary aged 70 d. 10 Aug 1900 Wallaroo Mines
No death recorded for Elizabeth wife of David MUTTON.
Was Elizabeth MUTTON aged 26 who died 4 Aug 1861 at Kooringa recorded with a husband named Richard actually the wife of David who then married Mary SHEAY in 1862???
Or was it just a coincidence a similar aged Elizabeth MUTTON died at Kooringa five years after the MUTTON & NICHOLLS marriage?
I cannot find a mention of a Richard MUTTON in any other BMDs in SA.
Another researcher seems to think William son of Elizabeth nee NICHOLLS was the son of David who married Mary SHEAY which is what I wondered BEFORE I found this page. And it does not help any confusion!!!
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=our_families&id=I1354Essie