Table 3. GIS-buffer (30-m) alteration type areas (m2) determined by GIS analysis of hybrid AVIRIS alteration
mapping for upper Animas River, Cement Creek, and Mineral Creek basin watersheds. Only watersheds where
buffered area of quartz-sericite—pyrite were determined are shown.
Basin and watersheds
Upper Animas River basin
California Gulch
Cement Creek basin
Dry Gulch
Prospect Gulch
Porcupine Gulch
Ohio Gulch
Topeka Gulch
Niagara Gulch
Mineral Creek basin
Battle Ship Slide
Red Tributary
South of Browns Gulch
Browns Gulch
West of Imogene Mine
Southeast of Chattanooga
Big Horn Gulch
quartz-sericite-pyrite (area m2)
6200
35500
173200
2400
44800
74300
25900
74700
3200
52300
9200
21900
9700
1900