Description

The Coffee Project comprises numerous gold occurrences, including the structurally-controlled gold-only Coffee deposit, which is hosted in poly-deformed Paleozoic basement rocks of the Yukon-Tanana terrane and Mesozoic plutons situated in the northern Canadian Cordillera, west-central Yukon. The deposit has been interpreted as having characteristics of numerous deposit types over the project’s history including epithermal, reduced intrusion-related, Carlin-type, and orogenic gold, as well as combinations of deposit types. Recent mapping efforts and new geochronology highlight a previously unknown secondary phase of the Permian Sulphur Creek suite and led to the relocation of the Coffee Creek fault which is interpreted as a primary controlling structure of the Coffee deposit. A new structural analysis builds on previous depth estimates and suggests that the deposit formed at a relatively shallow depth of 1–3 km and together with the new map has outlined the structural history of the deposit in greater detail. New dike geochemistry suggests some mineralized Coffee dikes may be related to the Carmacks group volcanics or Prospector Mountain suite intrusives, which implies a Late Cretaceous age of formation. Field relationships and timing of regional faulting together corroborate a minimum age of formation of ~57 Ma. Available multi-element geochemistry highlights a subtle Au-As-Sb ± Ag-Pb-Te-W-Zn-K metal association that suggests a possible magmatic component to the mineralizing fluids at Coffee. Newly drilled shallow mafic intrusions adjacent to the Coffee Creek pluton serve as a potential source and may be coeval with movement on the Coffee Creek and Big Creek fault systems.

Resources

Name	Format	Description	Link
Yukon Geological Survey publication metadata	HTML		https://data.geology.gov.yk.ca/Reference/96119
Original metadata (https://open.yukon.ca)	HTML		https://open.yukon.ca/information/3b8797d3-34d4-4c93-82c6-504cba51ce28
Appendices	ZIP		https://ygsftp.gov.yk.ca/ApexUploads/Publications/96119/Appendices.zip
Paper	PDF		https://ygsftp.gov.yk.ca/ApexUploads/Publications/96119/OF2025-6.pdf

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