Posted by Tom Napier on August 22, 2013 at 05:41:07 user Didymus.
In Reply to: Re: Dick’s green rushes – what were they? posted by Peter Hyland on August 21, 2013 at 09:29:30:
"Yes, the geology of areas like AR's High Topps is no doubt rather complex."
It must be if the SA&Ds are hacking out igneous rock in the Gulch while Slater Bob is mining a metamorphic rock only a couple of miles away. Presumably the Gulch lies within a relatively small granitic intrusion.