Code of Federal Regulations Title 43. Public Lands:  Interior § 43.3836.11 What are the general requirements for performing assessment work?

(a) Beginning in the assessment year that begins after you locate your mining claim, you must expend $100 in labor or improvements for each claim for each assessment year preceding the date on which you file for a small miner waiver.

(b) You may perform assessment work on:

(c) Your total expenditure must equal at least $100 per claim.