30 U.S. Code § 28c - Length and termination of deferment
The period for which said deferment may be granted shall end when the conditions justifying deferment have been removed: Provided, That the initial period shall not exceed one year but may be renewed for a further period of one year if justifiable conditions exist: Provided further, That the relief available under sections 28b to 28e of this title is in addition to any relief available under any other Act of Congress with respect to mining claims.
Source(June 21, 1949, ch. 232, § 2,63 Stat. 215.)