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While there are many complications associated with tribal employers, the situation you describe is a non-tribal employer that happens to be employing individuals on tribal land.
This makes the problem simpler.
You can file a wage and hour complaint against the employer.
(The Federal Department of Labor has a helpful guide and resources (you can even call for help with your claim) here: https://www.dol.gov/wecanhelp/faq.htm)
And the State of Nevada has their own wage and hour division: http://labor.nv.gov/ (use the drop down on the right hand side).
With these circumstances (involving tribal land), I would generally start with the Federal site - as noted, you can even contact them ahead of time to get their impression of the specifics of your case before you file - and if they refer you to the state level (where most wage and hour enforcement happens), you can then easily follow up with the NV state site I provided above.
If the above does not work and you would like to pursue a civil claim, you can speak to a local labor attorney (not a worker's compensation attorney - the two provide very different types of legal services). You can find local attorneys using the State and local Bar Association directories, or private directories such as www.AVVO.com; www.FindLaw.com; or www.Martindale.com (I personally find www.AVVO.com to be the most user friendly).