The Hummingbird showing is underlain from west to east by Permian limestones, overlain in apparent conformity by Upper Triassic cherty siltstones and shale and limestone; in turn overlain by Upper Triassic Stuhini Group metavolcanic rocks of the Stuhini Group. These massive andesites and breccias are intruded by mid-Upper Triassic Hickman batholith monzodiorite along a northwest trending faulted(?) contact. Northeast striking faults and shear zones appear to crosscut older northwest trending structures. Both structures contain mineralization and Tertiary(?) felsic dikes.

Podiform massive sulfide bodies, skarn mineral assemblages (garnet, diopside, chlorite) and weak associated mineralization have developed in mid-Upper Triassic limestones adjacent to the northwest trending Hummingbird fault. Sulphides include pyrite, pyrrhotite, chalcopyrite, galena which contain gold and silver values.

The 1988 drill hole at Hummingbird TR 88-1 2) intersected skarnified limestone, banded chert and two rhyolite dikes. The hole was abandoned short of the target massive sulfide lenses.

See Trophy (Ptarmigan) (104G 053) for related details a common work hisrtoy.