Maps of copper, lead, and zinc show high elemental concentrations in stream sediments collected from the Animas River watershed upstream from Silverton. These maps display the geochemical baseline when the samples were collected in the mid-1970s. Metal concentrations exceed 20 times crustal abundance values in stream sediments above Silverton. Thus, these maps include any effect that mining might have had on the stream reaches within the mining districts. These maps do not give an indication of the premining background levels of metals in the bed-sediments prior to mining in the vicinity of Silverton.
Stippled areas are outcrops of small rhyolite to quartz latite intrusives.
The large hachured mass at the bottom of the figure is the outcrop pattern of the Sultan Mountain quartz monzonite pluton.