1. Mineral Resources
2. Online Spatial Data
3. National Mineral Resource Assessment 1998

Mineral assessment tracts in Chester county, Pennsylvania

[Additional scientific data in this geographic area]

EC06: Mississippi Valley, Appalachian Zn (32b) (Late Paleozoic) , covers 3 % of this area

90%	50%	10%	5%	1%
3	6	8	11	14

SA18: Sediment-hosted Cu (30b) (Early Mesozoic) , covers 11 % of this area

90%	50%	10%	5%	1%
1	2	3	3	3

SA20: Low-sulfide Au-quartz vein (36a) (Paleozoic) , covers 57 % of this area

The number of undiscovered deposits in this tract was not estimated.