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required by section 8: Provided further, That the eligible 
applicant brings his application and his other activities into 
compliance with all applicable regulations issued by the 
Secretary, as soon as such regulations become effective. 
(4) Every license issued under this Act shall remain 
in force for ten years and, where commercial recovery of the 
hard mineral resources has begun from a licensed block 
within the ten-year period, such license shall remain in force 
for as long as commercial recovery from the block continues 
or until the end of the twentieth year subsequent to the 
beginning of the commercial recovery, whichever occurs first. 
“(c) TRANSFER OR SURRENDER OF Licnnsn.—Any 
license issued under this Act may be surrendered at will or, 
upon written request of the licensee, may be transferred by 
the Secretary to any other eligible applicant. Such license, as 
issued or as transferred, may be revoked for willful, substan- 
tial failure to comply with the provisions of this Act, with 
any regulation promulgated thereunder, or with any license 
restriction or condition, in a proceeding in an appropriate 
United States district court: Provided, That the Secretary 
has first given the licensee written notice of such violation 
and the licensee has failed to remedy the violation within 
a reasonable period of time. 
“(d) Lromnsz Conprrions.—The Secretary is au- 
thorized to include in any ‘license issued, or transferred, 
