http://www.digitalarchives.idaho.gov/

Don't see any Alturas County (predecessor to Blaine) mining claims for your family. (By the way, the Richard Crooks that comes up is completely different fellow from Idaho County in the northern part of the state - son of Jacob Crooks and Victoria Chamberlain.) However, I don't know the coverage for the database.

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http://www.glorecords.blm.gov/results/default.aspx?searchCri...

It does seem that James G. Crooks claimed some land in Blaine County. (Those search results will also show you Charles Crooks, but he also seems to be of the Idaho County Crooks, not your family.)