The Ishkoday Deformation Zone ("IDZ")
LAURION has completed the initial construction of the litho-structural predictive model (the “Model”) on the Ishkoday Gold-Polymetallic Project. LAURION’s exploration work to date has confirmed the presence of the new structural corridor: the 5km wide gold bearing Ishkoday Deformation Zone (“IDZ”).
LAURION has identified a new shear/deformation zone on Ishkoday, an apparent new splay from the Paint Lake Shear/Deformation Zone (the “PLDZ”). The new Break is similar to the PLDZ, and to other gold bearing deformation zones such as in the Abitibi Greenstone Belt: the Destor Porcupine (“DPDZ”) and Cadillac Larder Lake Deformation Zone (“CLLDZ”), which host major gold deposits.
This major kilometric long and wide northeast-southwest structural corridor encompasses most of the known precious and base metal mineralization at Ishkoday of the main 3km by 1km Target Area (refer to the Corporation’s news releases dated December 4, 2018 and February 14, 2019). Mineralization is open along strike to the east-northeast and west-southwest; and is open at depth down-plunge beyond 650m as indicated from the historic Sturgeon River Mine development and production.
Confidence in the model is demonstrated by the presence and abundance of surface exposed mineralized shears and multi-directional gold-bearing quartz veins/stockworks with local sulphide development (pyrite, chalcopyrite and sphalerite). The structurally hosted gold mineralization is primarily associated with more than 120 centimeter to meter wide quartz veins trending north to northeast, extend 100’s to 1,000’s meters in length, intersect all lithologies, including older vein-type copper-zinc mineralization.
Quartz veins, their extent and patterns mimic other lode gold deposits in the Abitibi Greenstone Belt, as at the Canadian-Malartic, Sigma-Lamaque, Dome, Detour, Bousquet-Doyon-LaRonde deposits.
Predictive modeling will be performed by Mira Geoscience (“Mira”) of Montreal (Quebec), who will generate a comprehensive 3-D image of the shear/deformation zones in and around Ishkoday, local faults, lithologies, and areas of potential enhanced quartz vein and sulphide development to concentre gold, silver, copper and zinc. The 3D model will incorporate LAURION’s project-wide database of 40,729m of diamond drilling, 14,992 individual samples with assays and geochemical analysis, geological mapping and ground geophysical data. This 3D inversion model will provide a comprehensive end product, which will serve as the basis for effective exploration program decisions and drill targeting.
Background Geology, Magnetics and Model
Ishkoday is located at the southern boundary of the Archean volcano-plutonic Wabigoon Geological Subprovince in the Onaman-Tashota Greenstone Belt (the “Onaman”). The Onaman is situated a few kilometers north of the 10-30km wide linear Beardmore-Geraldton Greenstone Belt (the “Beardmore”). The Beardmore yielded 4.4 million ounces of gold and 300,000 ounces of silver from 24 operations in the Beardmore-Jellicoe-Geraldton area in proximity to the PLDZ. The PDLZ occurs at the contact between the Onaman and the Beardmore.
The Onaman consists of mafic volcanics with massive to foliated (chlorite schists), porphyritic, amygdaloidal and pillowed basalts; and felsic volcanics with calc-alkaline dacites, rhyodacites and rhyolites as massive flows, volcanic breccias and tuffs, volcaniclastics, and quartz-feldspar porphyries (as flows and high-level equivalent intrusive dykes and stocks), much like those of Ishkoday. At Ishkoday, the felsic volcanic rocks and their equivalent high level intrusives contain vent facies tourmaline breccias, and disseminated to semi-massive iron sulphide (pyrite) and oxide (magnetite) veins with copper (chalcopyrite), zinc (sphalerite), silver, lead (galena), and chlorite.
The regional magnetic signatures (the “Magnetics”) in the Onaman belt highlight the arcuate-shaped lithologies deformed into northwest-southeast and east-west patterns by regional deformation and the emplacement of major granitoid intrusions, depicting classic volcano-plutonic terrains. The regional deformation created major shear/deformation zones forming anastomosing patterns across the Onaman, very similar to the gold bearing shear/deformation zones of the Abitibi Greenstone Belt.
For the purposes of the LAURION Model, the new shear/deformation zones of the Onaman outside of the Break are the Northwind, Fairview and Onaman “Breaks”. Ishkoday occurs on the southernmost “Breaks”, the Sturgeon River Break, where there are at least two additional subsidiary shear/deformation zones giving an overall 5 km width to the combined IDZ. The proximity of the PLDZ to the IDZ suggest a splitting of the former into multiple east-west to northeast-southwest shears at Ishkoday, giving the Ishkoday Deformation Zone. The presence of multiple shears and movement within the Break would significantly fracture the brittle felsic volcanic package at Ishkoday, allowing for the development of the observed quartz veins with gold-sulphides.
Location of the Ishkoday Project in the Superior Province
Distribution of Major Deformation Zones in the Abitibi Greenstone Belt
Proposed Major Deformation Zones - Onaman-Tashota Greenstone Belt
Current Model - Geology/Mineralization
Metallogeny at the Ishkoday Project