China has a lot of minority groups and each group has its own language, if not a bunch of them.
What resources are there for learning Chinese minority languages?
Naxi Dongba script : http://sinoglot.com/naxi/
Check out Ethnologue - http://www.ethnologue.com/country/CN/languages .
For specific information on each Chinese minority language click on "More information"
i.e. for Narua (6b (Threatened). Language of recognized nationality: Mongolian. Sichuan Province speakers assigned to the Mongolian nationality. Language of recognized nationality: Naxi. Yunnan Province speakers officially classified within Naxi nationality), it will lead you to:
For learning, if you click on "Language Resources" you get: