Victoria’s Dublin Gulch claim block is located in the Mayo Mining District approximately 80 km from Mayo and is centred on the Eagle Gold Deposit. The Olive-Shamrock Zone lies within sight of Company’s proposed Eagle Gold Mine and is easily accessible by an existing road network.
Olive-Shamrock Target Deposit Type
The Olive-Shamrock Zone represents a shear-zone hosted gold exploration target genetically related to the Company’s Eagle gold deposit: an intrusion-related gold system associated with Cretaceous Tombstone and Mayo suite granodiorite intrusions and structurally-controlled high-grade gold-sulphide ± silver-sulphosalt veins.
The Olive-Shamrock Zone is located approximately 2 km from Victoria’s Eagle gold deposit, is defined by a broad gold/arsenic in-soils geochemical anomaly, lies on the intrusive-sediment contact of the Potato Hills Trend (as is Eagle) and is punctuated by several historically exploited high-grade sulphide veins.
Geology and Mineralization
The Property is located in the north-central part of the Selwyn Basin, which is a fault controlled epicratonic basin. The stratigraphy of this basin is divisible into four predominantly clastic lithological units. From youngest to oldest they include, the Lower Schist, Keno Hill Quartzite, Upper Schist, and Hyland Group (formerly the Grit Unit). The Lower Schist is probably of Mesozoic age and the Upper Schist and Keno Hill Quartzite are of Paleozoic age (Devonian-Mississippian). The Hyland Group is of Proterozoic to Lower Cambrian age. These units have been juxtaposed by laterally extensive, northward-directed thrusting that occurred in early Cretaceous time (Figure 7.1).
There are three principal thrust sheets known as the Dawson Thrust, the Tombstone Thrust, and the Robert Service Thrust. The Robert Service Thrust is proximal to the Property area and is inferred to have superimposed the Proterozoic–Cambrian age Hyland Group upon the Mississippian-age Keno Hill Quartzite.
Four phases of deformation have been documented. Only the first two resulted in the generation of penetrative structures. Thrusting during the first phase resulted in the widespread development of foliation that was subsequently deformed by gentle, regional-scale folding during the second phase of deformation. Several east-west trending, west-plunging anticlines in the Dublin Gulch area are attributed to this second deformational event.
During the mid-to-late Cretaceous period, there were three granitoid intrusion events: the Selwyn Suite (between 104 and 98 Ma), the Tombstone Suite (between 94 and 92 Ma), and the McQuesten Suite (64 Ma). The Selwyn and Tombstone intrusive events were probably synchronous with the second regional folding event. Intrusives are commonly emplaced within the Hyland Group, and less commonly within the Upper Schist.
Cretaceous-age deformation and intrusion are possibly related to north-northeast directed subduction and related arc-trench magmatism of the oceanic Farallon Plate beneath continental North America.
Numerous mineral deposits are associated with the Cretaceous-age intrusives and they are generally vein, shear, and skarn related. Gold, silver, lead, zinc and tungsten are the principal elements of economic interest. The Tombstone Suite forms part of the Tombstone Gold Belt, which is the eastern part of the Tintina Gold Province. The Tombstone Suite is the primary source of intrusion-hosted gold deposits in Yukon. The western portion of the Tintina Gold Province has been dextrally displaced approximately 450 km by the Tintina Fault and contains gold deposits that include Fort Knox, Pogo and Donlin Creek in Alaska. In Yukon, Dublin Gulch and Brewery Creek occur within the Tombstone Gold Belt.
The Property is located on the northern limb of the McQuesten Antiform and is underlain by Proterozoic to Lower Cambrian-age Hyland Group metasediments and the Dublin Gulch intrusion, a granodioritic stock. The stock has been dated at approximately 93 Ma, and is assigned to the Tombstone Plutonic Suite (Figure 7.2). The Olive Zone is located on the contact margin of the Granodiorite stock and the intruded hornfelsed metasediments, and The Olive mineralization is interpreted to be controlled by a NE-SW striking, steeply dipping Shear Zone sub-parallel to the main lithological contact.
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