Hostrocks in the DM139 area consists of a belt of northerly trending, reddish to maroon andesitic volcaniclastic and volcanic rocks of the Jurassic Betty Creek Formation (Hazelton Group); included in this sequence are crystal lithic tuffs, tuff breccia, coarse lapilli tuffs and thin beds of ash and fine lapilli tuff.

An undulating 10-centimetre-wide quartz vein with a centre of sulphides (up to 20 per cent) consisting of arsenopyrite and lesser pyrite was reported to occur near the edge of the Ataman Glacier. It appeared to be a discontinuous structure. Sample DM139, which sample the vein, assayed 3.62 grams per tonne gold, 15.1 grams per tonne silver, and 0.036 per cent copper (Assessment Report 37453).

Refer to Ataman (104A 179) for related geological details and a more complete work history of the Surprise Creek Property. Also refer to the nearby Surp 3 MINFILE showing (104A 195) for additional related information.