Metallic mineral mining activities and Level C mineral exploration activities shall be allowed only within the D-PD Development Subdistrict. The size of such Subdistrict shall be limited to an area necessary to reasonably conduct authorized mining and Level C mineral exploration activities, and to adequately buffer those activities from surrounding resources or uses, but in no event shall it be less than 50 contiguous acres.
01- 672 C.M.R. ch. 12, § 3