The Goodfish-Kirana Project is largely situated in the volcanic-dominated Blake River Group and is approximately 6 km north of the Cadillac-Larder Lake Deformation Zone (CLLDZ) in the Kirkland Lake Gold Camp of the Southern Abitibi. The project area also covers a portion of the prospective angular unconformity between the Blake River Group and the overlying clastic sediments of the Timiskaming Group. The volcanic stratigraphy is folded and crosscut by two regional-scale deformation zones: the Kirana Deformation Zone, an upwards of 30 m wide gold-bearing shear zone; and the westward projection of the Victoria Creek Deformation Zone, the controlling structure at the Upper Beaver Deposit. The property has historically been overlooked both by industry and academia due to its distance from the CLLDZ. However, recent research conducted by Frieman et al. (2018) has worked to understand the complex regional structural geology and concluded that the Kirana Deformation Zone is an associated shear-splay of the CLLDZ. (Source)
The Goodfish Deformation Trend is the third major structural feature on the property; this three-kilometer long structural feature hosts some of the best known gold occurrences on the property. The apparent “S” fold structure in the west-central part of the property, clearly delineated in the property-scale magnetics, consists of a repeated sequence of Fe-Tholeiites, marked by the magnetic highs, in contact with magnetic low domains comprised of Mg-Tholeiites, intermediate volcaniclastics, and QFP dykes. Recent field activities have been focused on identifying and targeting oblique shear zones that trend parallel to the axial planes of the “S” fold structure, one of which hosts the "A" Zone. Several of these structures, as well as the extension of the “A” Zone Shear, can be seen in the magnetics, defined by zones of demagnetization of the Fe-Tholeiites. The extensions of these structures inferred from the magnetics have strike lengths of up to 2 km. It is believed that the north-south alignment of pits and shafts, starting with Deloye in the south and extending northward through the Goodfish Trend, is controlled by the intersection of these shear zones with preferred stratigraphy.
Illustration of Kirana Break a 2nd Order Mineralized Structure to the Larder Lake Cadillac Deformation Zone.
(Modified from Frieman & Kuiper, 2019)
To date, mineralization has been discovered in several different structural settings. These settings include:
3rd Order shear zones developed parallel to the axial plane of the ‘S’ fold structure- e.g. “A” and “C” Zones
2nd Order, E-W trending shear zones (Kirana DZ)- e.g. Deloye
Local mineralization controls vary but observations reveal that mineralization is commonly located at the contact between host units of differing physical and chemical properties, mainly QFP dykes and mafic volcanics. Shear zones are associated with an abundance of QFP dykes, intense Fe-carbonate, sericite and silica alteration, multiple generations of shear quartz-carbonate ± pyrite veins and multi-phase quartz-pyrite breccias. The geometry of the mineralized shoots and structural controls are still poorly understood. As new data is acquired and the model evolves, evidence suggests that shear zone intersections with key lithological units and other secondary structures as well as changes in shear zone orientation (rolls and jogs) likely control the geometry of the mineralized shoots.