This Dillard (Northwest Trenches) occurrence is centred 2.3 kilometres west-southwest of the confluence of Siwash and Galena creeks, 37.5 kilometres north- northeast of Princeton.

The Dillard Zone showing occurs along the contact between a northwest-trending body of quartz porphyritic monzonite/quartz syenite of the early Tertiary Otter intrusions to the east, and granodiorite of the Middle Jurassic Osprey Lake batholith to the west.

Trenching in a northerly trending gossanous zone, over a 200 by 200 metres area, intersected highly altered quartz syenite containing abundant pyrite and secondary manganese (pyrolusite (?)) and minor amounts of magnetite, chalcopyrite and tetrahedrite. "Noteworthy amounts" of silver and zinc are reported (Assessment Report 1800, page 3). A sample analysed 0.21 to 0.40 per cent zinc and 3.8 to 10 grams per tonne silver (Assessment Report 7992, rock geochemistry maps). Sampling of closely-spaced parallel trenches yielded values of 3.4 to 10.3 grams per tonne silver and 0.1 to 0.3 per cent zinc (George Cross News Letter No. 52 (March 14), 1968).

The area has been explored in conjunction with the nearby Snowstorm (MINFILE 092HNE032) occurrence and completed exploration history can be found there.