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APPENDIX 2. Geochemical anomaly maps
A set of geochemical data for this area consists of rock and mineralized samples that
were collected and analyzed for various elements by Korzeb and Kness (1994), Korzeb et
al. (1995) and McLemore et al. (1999). Anomalous concentrations of trace elements Au,
Ag, Se, Te, Bi, Cd, Mo, and As distribution in Hillsboro mining district were plotted,
using above data, on geologic map modified from Hedlund (1977) through [email protected]
1
Figure A2-1. Anomalous Ag is found mostly in Laramide veins. The concentrations in
samples above 5 ppm Ag were plotted on the geologic map (modified from Hedlund,
1977a, b).
2
Figure A2-2. Anomalous Au is found mostly in Laramide veins. The concentrations in
samples above 100 ppb Au were plotted on the geologic map (modified from Hedlund,
1977a, b).
3
Figure A2-3. Anomalous Bi is found mostly in Laramide veins. The concentrations in
samples above 30 ppm Bi were plotted on the geologic map (modified from Hedlund,
1977a, b).
4
Figure A2-4. Anomalous concentration of Mo found in both porphyry deposit and
Laramide veins. The concentration in samples above 25 ppm Mo were plotted on the
geologic map modified from Hedlund, 1977a, b).
5
Figure 5. Anomalous Cd is located in few samples from Laramide veins and replacement
deposits. The concentrations in samples above 1 ppm Cd were plotted on the geologic
map (modified from Hedlund, 1977a, b)
6
Figure 6. Anomalous concentration of Te is found in five samples from Laramide veins.
The concentrations in samples above 10 ppm Te were plotted on the geologic map
(modified from Hedlund, 1977a, b).
7
Figure 7. Anomalous concentration of Se is found only in few samples from Laramide
veins. The concentrations in samples above 10 ppm Se were plotted on the geologic map
(modified from Hedlund, 1977a, b).
8
Figure 8. Anamolous concentration of As is found in Laramide veins. The concentrations
in samples above 25 ppm As were plotted on the geologic map (modified from Hedlund,
1977a, b)
9
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