The Holden mine produces copper, gold, and zinc from a shear zone-replacement deposit in which the control of mineralization was primarily structural. Selective replacement of a sheared siliceous amphibole schist host rock was a contributing factor. Two stages of mineralization are recognized. The ore body has been severely intruded by post-ore plutonics of a dioritic nature. No serious displacements of the economic portion of the mineralized zone have occurred.

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