True widths are estimated to be 60% to 75% of reported core size intervals. Intervals not recovered by drilling had been assigned zero grade. Prime cuts haven’t been utilized to excessive grade assays.
A complete of 10 diamond drill rigs are presently lively on the undertaking. So far in 2021, 41,000 metres have been drilled in 134 holes at Island Mountain, which encompasses each the Mosquito Creek and Shaft Zone deposits within the Cariboo undertaking. The drill marketing campaign is geared toward each exploration and upgrading current sources.
Cariboo is Osisko Growth’s flagship asset, with measured and indicated sources of 21.4 million tonnes grading 4.6 gold g/t for a complete of three.2 million oz. of gold and inferred sources of 21.7 million tonnes grading 3.9 gold g/t for a complete of two.7 million oz. of gold. The undertaking is advancing by means of allowing as a 4,750-tonnes/day underground operation, with a feasibility examine on observe for completion within the second half of 2021. The corporate is testing using ore sorting expertise on the undertaking.
Mineralized quartz veins on Cariboo general have a sub-vertical dip and northeast strike. A vein hall is outlined as a high-density community of mineralized quartz veins inside the axis of the final folding occasion, and two vein corridors are hosted inside a brittle meta-sandstone or calcareous meta-sandstone. Vein corridors are modelled at a minimal thickness of two metres and common about 4.5 metres true width. Particular person mineralized veins inside these corridors have widths various from centimetres to a number of metres and strike lengths from just a few metres to over 50 metres.
These corridors have been outlined from floor to a vertical depth averaging 300 metres and stay open for growth at depth and alongside strike. Gold grades are intimately related to quartz vein-hosted pyrite in addition to pyritic, intensely silicified wall rock haloes in shut proximity to the veins.
(This text first appeared within the Canadian Mining Journal)