Explained by T.L. Klein

On the choice of deposit models

Volcanic rocks in the Charlotte belt, Belair belt, the high-grade Ashland-Wedowee terranes of Alabama and parts of the Carolina slate belt, are considered permissive for the occurrence of kuroko massive sulfide deposits, although they contain few examples.

On the delineation of permissive tracts

The permissive tract includes volcanic rocks in the Carolina slate belt, Charlotte belt, Belair belt, and the high-grade Ashland-Wedowee terranes of Alabama, exclusive of areas with known deposits. No estimate of undiscovered deposits was made.