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

Mineral assessment tracts in Ravalli county, Montana

[Additional scientific data in this geographic area]

NR04: Skarn Zn-Pb (18c) (Mesozoic - Tertiary) , covers 4 % of this area

90%	50%	10%	5%	1%
0	0	2	4	6

NR07: Skarn Au (b1930) (Mesozoic - Tertiary) , covers 4 % of this area

90%	50%	10%	5%	1%
5	12	20	28	36

NR10: Porphyry Cu (North America) (17) (Cretaceous - Eocene) , covers 72 % of this area

90%	50%	10%	5%	1%
0	1	3	6	7

NR13: Polymetallic replacement (19a) (Mesozoic - Tertiary) , covers 4 % of this area

90%	50%	10%	5%	1%
1	4	6	8	12

NR36: Sediment-hosted Cu, reduced-facies (30b.1) (Proterozoic) , covers 0.5 % of this area

90%	50%	10%	5%	1%
0	0	1	3	5

NR37: Sediment-hosted Cu, Revett (30b.3) (Proterozoic) , covers 1 % of this area

90%	50%	10%	5%	1%
9	10	15	20	30

NR39: Sedimentary exhalative Zn-Pb (31a) (Late Proterozoic) , covers < 0.1 % of this area

90%	50%	10%	5%	1%
0	2	4	6	8