Ignore this death - not the right one.
The brief tree I can see shows a death for Richard Mitchell, 1887.
NSW family history site shows this death:
District: Cowra - reg no. 7148/1887
Richard H Mitchell
Father's name William H
Mother's name, Selina
However, Ancestryindexes show other Mitchell births with parents William H and Selina which are much later so would need to be checked.
Example : Edwin A died 1926
***Family Search/Find a Grave shows Selina Lock Mitchell and mentions Richard Henry 1886-1887
https://www.rootschat.com/links/01ttl/