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

Mineral assessment tracts in Montgomery county, Maryland

[Additional scientific data in this geographic area]

SA18: Sediment-hosted Cu (30b) (Early Mesozoic) , covers 8 % of this area

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

SA20: Low-sulfide Au-quartz vein (36a) (Paleozoic) , covers 60 % of this area

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

SA21: Low-sulfide Au-quartz vein (36a) (Paleozoic) , covers 24 % of this area

90%	50%	10%	5%	1%
2	5	8	8	8