Mineral assessment tracts in Contra Costa county, California

[Additional scientific data in this geographic area]

PC11: Massive sulfide, Besshi (24b) (Mesozoic) , covers 0.8 % of this area
90%50%10%5%1%
00001
PC34: Hot-spring Au-Ag (25a) (Tertiary) , covers 81 % of this area
90%50%10%5%1%
11222
PC39: Low-sulfide Au-quartz vein (36a) (Mesozoic) , covers 51 % of this area
90%50%10%5%1%
00001