Work History

Staked as Scronk cl 1-9 (YB03818) in Aug/90 by S. Ebert and G. Couture, who performed geological mapping, silt and rock geochemistry and petrographic work in the same year.
Restaked as Fan cl 1-10 (YB65330) in May/96 by Eagle Plains Resources Ltd and Miner River Resources Ltd, which carried out reconnaissance geological mapping and rock sampling program later in the year.

Capsule Geology

The area is located in the north-central portion of the Selwyn Basin, near the boundary with the Mackenzie Platform. The area is underlain by Paleozoic sedimentary rocks which have been intruded by mid-Cretaceous granitic intrusions.
The occurrence overlies the intrusive contact between a small mid-Cretaceous, mesocratic porphyritic syenite stock assigned to the Tombstone Suite and a north dipping, Middle to Upper Silurian age, succession of slates, argillites and cherts assigned to the Road River Assemblage. Mineralized veins occur in joints and fractures of the syenite porphyry. The veins range from a few mm to 0.5 m wide and make up 7 to 15% of the rock. They are vuggy, with coarse euhedral quartz crystals and contain variable amounts of sulphides ranging from 5 to 100%. Arsenopyrite is usually the dominant sulphide mineral, but occasionally galena predominates. The quartz-arsenopyrite veins within the intrusion returned Au values ranging from 0.5 g/t to 21 g/t while galena rich veins are very argentifeous with one sample returning 416 g/t Ag.
A set of subparallel veins extends outward from the intrusion into the surrounding succession of slate and argillite; these veins contain mostly arsenopyrite, with lesser amounts of pyrite, pyrrhotite, galena, sphalerite, tetrahedrite, stibnite, chalcopyrite and possible disseminated gold. Arsenopyrite rich veins returned 1.5 to 6 g/.t Au, while polymetallic veins returned Au values up to 36 g/t.
In general, vein widths vary from a few millimetres up to 15 cm with an average width of around 2 cm. Due to steep terrain and the weathered nature of outcrops, vein density is difficult to estimate but Ebert estimated them to be as much as 10% or more. Within the shales and argillites disseminations and pods (1.5 by 0.5 cm) of pyrite, pyrrhotite and arsenopyrite occur between and around the subparallel veins. These pods of sulphides may indicate abundant fluid activity during the mineralization event.
Eagle Plaines and Miner Rivers¿ exploration results generally matched those reported by Ebert and Couture. The companies best selected grab samples returned 14.0 g/t Au and 2 000 ppm Bi and 9.4 g/t Au and 157 ppm Bi.

References

EBERT, S., Feb/91. Assessment Report #092956 by S. Ebert.

EAGLE PLAINS RESOURCES LTD AND MINER RIVER RESOURCES LTD, May/97. Assessment Report #093614 by J.R. Dickie.

GORDEY, S.P., AND MAKEPEACE, A.J., 1999. Yukon digital geology, S.P. Gordey and A.J. Makepeace (comp.); Geological Survey of Canada, Open File D3826, and Exploration and Geological Services Division, Yukon, Indian and Northern Affairs Canada, Open File 1999-1 (D).