![1907 Silver Valley Idaho geologic map, where m is monzonite and syenite, Ap is Prichard Slate, Ab is Burke Formation, Ar is Revett Quartzite, Asr is St. Regis Formation, Aw is Wallace Formation, Asp is Striped Peak Formation, Tg are Tertiary terrace gravels, Qgl is Quaternary glacial deposits, Qal is Quaternary alluvium, x is a prospect pit and y is a tunnel](http://upload.wikimedia.org/wikipedia/commons/thumb/5/5f/1907SilverValleyIdaho_geologicmap.png/800px-1907SilverValleyIdaho_geologicmap.png)
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