Fabled Copper Corp. announces that it has received preliminary data from the 2002 underground LIDAR Survey conducted in August 2022 on its Muskwa Copper Project.
The Muskwa Project is comprised of the Neil Property, the Toro Property and the Bronson Property located in northern British Columbia The object of the underground LIDAR survey was to develop and test a work flow process for the use of autonomous UAV systems or mounted systems to create and continuously update an as-built 3-D model oof the underground development of the Eagle and Harris veins specifically levels 6400' and 6950' of the Eagle deposit using "Simultaneous Localization And Mapping (SLAM) optimization methods to create a 3D point cloud data set. A less that 10 cm georeferenced accuracy was accomplished in past process trials. The output data will be available in .las, .csv, or .ply format with all files georeferenced. The exynpak and geoslam discovery pack systems, note books and geomatics surveying equipment such as robotic total station, YPS backsight, RTK GPS system, etc.
From August 1 to August 5, 2022, CNA Office of Applied Research and Innovation (OARI) employees Blair Bridger, Charlie Dalton, and Dr. Gary Thompson were at Fabled Copper's Muskwa mine site in northern British Columbia. The purpose of this trip was to test whether Mobile Mapping Systems (MMS) could be used to generate an accurate georeferenced dense point cloud of old underground workings. The resulting 3-D model would then be used to collect geospatially referenced samples for assay, which then could be used to generate a 43-101 compliant resource. The MMS used were the GeoSLAM Zeb Horizon and the ExynPak, in both the Eagle vein and the Harris vein. The initial plan was to install control points inside the Eagle Vein using traditional survey techniques and use these controls points to geo-reference the collected scan data. This proved to be impossible due to ice buildup in the first 100 m of the adit that reduced the effective height to less than 1.3 m. The total station used and to establish control points it requires a minimum of 1.5m to operate. To overcome this issue, control was established outside the entrance of the Eagle vein and used to geo-reference an initial scan that subsequent scans would be aligned with during post-processing. This same procedure was applied to the Harris vein. During post-processing, the team encountered some issues when aligning subsequent scans of the Eagle vein to the first georeferenced scan. The scans were roughly aligned manually in Veesus's Arena4D software, and a fine registration algorithm was run in the same software. It was found that a combination of manual and automated registration was most effective for this application. While the registration is not perfect the error observed should not be an issue when identifying coordinates of drill targets.
In areas measured, the maximum error was 3.61 cm. Had there been no ice buildup on the interior floor of the mine, a traverse could have been run, placing coordinated points throughout the vein. This would have greatly improved both the accuracy and efficiency of registration, and should the opportunity arise, this is the method that will be used in future scans. The Harris vein was able to be completed in one georeferenced scan.