The geology underlying the Catto Zone is similar to the Olive-Shamrock deposit to the northeast and consists of a stratigraphic sequence of quartzites, schists, and phyllites which has been intruded by the Dublin Gulch Stock. A gently dipping homocline striking roughly north controls the metasedimentary lithologies and close to the granodiorite-metasedimentary contact variably developed hornfels are common. Faulting and shearing is well-developed in and around the contact zone and parallel milky white quartz, quartz-scheelite and quartz-arsenopyrite-scorodite veins are seen in association with the contact zone.
The Catto Zone has seen sporadic exploration since the early 1900's and is the site of multiple open-cuts, shafts and adits from high-grade gold past-producers; including the Green Vein Tunnel, the Cabin Vein Tunnel and the Victoria Vein Adit. These proven, quartz vein-hosted, high-grade gold mineralized targets suggest a contact-related gold mineralized system located only 300m from the southeast portion of the Olive-Shamrock Deposit.
Historic grab samples from the Catto Zone have returned highly anomalous precious metals results, indicative of the tenor of high-grade past producers, including those outlined in the table below:
|Prospect||Au (g/t)||Ag (g/t)|