The Heat 1-3 claims are situated on the intrusive contact of the Hyder quartz monzonite with Unuk River Formation (Hazelton assemblage) volcanic epiclastics and Salmon River Formation (Bowser assemblage) sedimentary rocks. The Middle Jurassic siltstones and greywackes of the Salmon River Formation form a tight, partially overturned syncline unconformably overlying Unuk River rocks on the west side of Heat 2. The Eocene quartz monzonite intrusive rocks occupy the southwest corner of Heat 3. The Unuk River volcanic epiclastics and crystal tuffs have been metamorphosed in a kilometre wide belt next to the quartz monzonite intrusive. This has resulted in a zone of highly sheared and deformed schists and gneisses. The well-developed foliation within the metamorphic rocks parallels the contact of the quartz monzonite intrusive. Vein mineralization in the vicinity of the claims appears to be limited to faulted and fractured areas of the Unuk River epiclastics. A major northwest-southeast fracture system extends from Portland Canal across Mount Rainey and through the Heat 1-3 claims.