In 1847 Susanna Mayne was a beneficiary of her father's will.
In 1851 Susan Mayne, aged 44, born in Camborne Cornwall, and husband James Mayne, aged 46, born in Illogan Cornwall, copper mine agent, were in Brea, Illogan. With them were children: Olivia (21) of Camborne, dress maker, Alice (19) of Camborne, Eliza (17) of Camborne, Susan (12) of Illogan, James (9) of Gwithian, scholar, John (7) of Gwithian, scholar, Josiah T. (5) of Gwithian, and Mary (3) of Illogan.
In 1861 Susanna Mayne, aged 54, born in Camborne, and husband James Mayne, aged 56, born in Illogan, mine agent, were at Mayne's House, Tuckingmill, Illogan. With them were children (born in Illogan): Susan (21), John (17), mine accountant, Josiah Thomas (15), scholar, and Mary (12), scholar.
In 1871 Susanna Mayne, aged 64, born in Camborne, and husband James Mayne, aged 66, born in Illogan, retired tin mine agent, were at Nance House or 1 Daveys Row, Illogan. With them were children (born in Illogan): Josiah T. (25), grocer and flour factor[y], and Mary (22).
In 1881 Susanna Mayne, aged 74, born in Camborne, widow, deriving income from interest of money, was at Roskear Villas, Tuckingmill, Camborne.
In 1891 Susan Mayne, aged 84, born in Camborne, widow, living on her own means, was in Roskear, Tuckingmill, Camborne.
----------------------------
Susannah Mayne of Roskear Villas died aged 84 years (burial record).
----------------------------
MAYNE—At a good old age, at Roskear villas, Camborne, Mrs Susanna Mayne, relict of the late Capt James Mayne and sister of the late Capt Charles Thomas, of Dolcoath mine.
Cornishman, Thursday, 5 Nov 1891, p. 8
----------------------------
The Will of Susanna Mayne late of Roskear in the parish of Camborne in the county of Cornwall, widow, who died 28 October 1891 at Roskear, was proved 20 November at the Principal Registry by Alice Thomas Mayne, widow, and Susan Mayne (wife of John Mayne), both of Pool in the parish of Illogan in the said county, the daughters, the executrixes. Personal estate £931 11s. 2