S.C. Code § 48-20-80
An operator engaged in mining under an operating permit may apply for modification of the permit. The application must be in writing upon forms furnished by the department and must state fully the called-for information. The applicant may be required to furnish other information as may be necessary to the department to enforce this chapter adequately. It is not necessary to resubmit information which has not changed since the time of a prior application if the applicant states in writing that the information has not changed.
A modification under this section may affect the land area covered by the operating permit, the approved reclamation plan coupled with the operating permit, or other terms and conditions of the permit. An operating permit may be modified to include land neighboring the affected or permitted land but not other lands. The reclamation plan may be modified if the department determines that the modified plan fully meets the standards set forth in Section 48-20-90 and that the modifications are generally consistent with the basis for issuance of the original operating permit. Other terms and conditions may be modified only if the department determines that the permit as modified meets the requirements of Sections 48-20-60 and 48-20-70.
In lieu of a modification, an operator may apply for a new permit in the manner prescribed by Sections 48-20-60 and 48-20-70.
No modification of a permit becomes effective until required changes have been made in the performance bond or other security posted under the provisions of Section 48-20-110 to assure the performance of obligations assumed by the operator under the permit and reclamation plan.
S.C. Code § 48-20-80