This might help.

http://www.health.qld.gov.au/atsihea...erminology.pdf

Guidelines for correct use of ‘Indigenous’
As ‘Indigenous’ is not specific, some Aboriginal and Torres Strait Islander people feel the term diminishes their identity and should be avoided. Queensland Health’s preference is to primarily use ‘Aboriginal and Torres Strait Islander’; however in certain circumstances ‘Indigenous’ with capitalisation is acceptable.
 Aboriginal and/or Torres Strait Islander Queenslander (preferable)
 Indigenous Queenslander (acceptable)

The lowercase word ‘indigenous’ is only used when referring to people originating in more than one region or country, therefore, when referring to Aboriginal and Torres Strait Islander people, lowercase ‘indigenous’ is not acceptable.