January 20, 2026
Validating Multiphysics-Generated Drill Targets at Macmillan Pass
Providing metre-scale resolution over a volume measuring 600 million m3 from only 3 drillholes, this program showcases the success of muon tomography and multiphysics fusion for greenfield exploration at one of the world’s largest undeveloped primary zinc districts.
Macmillan Pass
PROJECT
Yukon Territory, Canada
LOCATION
Borehole
IDEON MUON DETECTOR
Massive sulphide Zn-Pb-Ag
MINERALIZATION
Located in eastern Yukon Territory about 400 km from Whitehorse, Fireweed Metals’ Macmillan Pass project hosts several large zinc-lead-silver deposits within the 940 km2 property. It is recognized as one of the world’s largest undeveloped primary zinc districts. The very high density of high-grade massive sulphide bodies observed at Macpass makes the targets particularly well suited to detection using muon tomography.
Ideon worked with Fireweed to deploy the REVEAL™ for Exploration solution at Macpass in fall 2024, with the goal of identifying and mapping new targets for drill-testing during the summer 2025 exploration campaign. Results from the multiphysics (muon + gravity) program validated key geological hypothesis about the site, confirmed mineralization trends, and identified three new advanced drill targets outside of the mineral resource exhibiting anomalous estimated density.
“Validated against known geology, muon tomography is an effective tool for subsurface density characterization. This broad-scale visibility allows us to operate more cost-effectively and decrease our exploration footprint.”
“Fusing the muon and gravity datasets yields a holistic density model of the subsurface, delivering high spatial control on a layered deposit of higher and lower-density intervals. This clarity is not possible in gravity surveys alone.”
Discover the validated outcomes at Macmillan Pass
Download the full case study for detailed content and analysis at the Macmillan Pass imaging program.
