The Chimney area is underlain predominantly by north striking, west dipping andesitic tuffs, agglomerates and minor flows of the Lower Jurassic Unuk River Formation (Hazelton Group). Immediately east of Lydden Creek, a conformable body of amygdaloidal feldspar porphyry, containing phenocrysts of feldspar and augite, may represent a sill or a flow. Tertiary(?) quartz monzonite, diorite and hornblende porphyry dikes are common. These trend northwest and northeast and are part of the Portland Canal dike swarm. The area is intensely fractured and faulted. North trending, west dipping dip-slip faults are most conspicuous and appear to be younger than east trending faults.

Mineralization identified by exploration undertaken at the Red Cliff project is that hosted in a wide shear zone and various zones of sericite alteration. The shear trends north-south along the length of the Crown Granted mineral claims and extends on to the Silver Crown 6 at the north end. Within this 2-kilometre length of shearing, various mineralized zones are present. From the south end of the shear, going towards the north, these include the Red Cliff, Chimney, Road, Waterpump, Lower Montrose and Montrose Zones.

The Road Zone is located north of the Chimney Zone and has been exposed in a 50-metre-long road cut. The area contains a weak gossan with galena-sphalerite veinlets noted along the east side, like that observed at the Montrose Zone (104A 033). Along the northeast portion of the exposure, pyrite-chalcopyrite was noted in quarts veinlets. Grab sampling in 2009 of these veinlets yielded values in the range of 1 gram per tonne gold (Dick, L., Technical Report for Decade Resources Ltd and Mountain Boy Minerals Ltd., December 9, 2014). Along the west side of the zone, a 5-metre zone of quartz veining with strong pyrite and minor chalcopyrite is present. This zone yielded low gold values.

The Chimney Zone is a conspicuous gossan along a steep avalanche chute on the west side of Lydden Creek, approximately 200 meters north of the Red Cliff Zone. Within the shear zone are several veins and veinlets of quartz-pyrite, up to 3 centimetres wide, forming a weak stockwork. Also present are several somewhat erratic zones of sericite alteration which contain 1 to 7 percent finely disseminated pyrite. In association with the pyrite and quartz exist minor amounts of chalcopyrite. The overall width of this mineralized zone is roughly 20 metres.

See Red Cliff (104A 037) for work history details.