A nonconforming soil mining operation may expand by mining within
the boundaries of the original parcel on which the mine was legally
permitted, only to the extent allowed by an existing DEC permit or
as otherwise provided by the laws of New York State. Such an operation
may not begin to process materials mined off-site by crushing, screening,
sorting, washing, drying, or otherwise, unless the Planning Board
grants a special permit to allow such processing. This shall not prevent
the continuation of any nonconforming soil mining operation which
was processing materials mined off-site at the time it became nonconforming,
nor shall it prevent the continuation of any nonconforming industrial
use of a property where soil mining products mined off site are used
as a raw material.