The oldest rocks in the Joy 1 area are complexly folded and metamorphosed schists and gneisses, and mafic volcanics (basalt) all of Devonian age and belonging to the Stikine Assemblage. These are overlain by Devonian to Permian, white to grey, crystalline limestone and other sedimentary and volcanic rocks of the Stikine Assemblage. Regionally, these rocks are overlain by a volcanic and sedimentary sequence of the Upper Triassic Stuhini Group. Late Devonian and Eocene intrusions are mapped in the Joy region.

The dominant lithology on the property is an extensive unit of massive, intermediate volcanics which are characterized by the presence of rounded inclusions of plagioclase porphyry material. Propylitic alteration is pervasive and intense within this unit, with saussuritized plagioclase phenocrysts and massive epidote occurring as fracture infillings.

A massive unit of grey-white, crystalline limestone, occasionally with abundant crinoid fossil fragments occurs along the east side of the Verrett River on the Joy 1 claim (Assessment Report 16794). It is a resistive unit and outcrops as predominant hummocks and is thought to be unconformable with the volcanic and sedimentary sequence that occupies most of the Joy claims.

A zone of pyrite mineralization occurs near the convergence of two small shears in a creek bed, approximately 300 metres east of the Verrett River on the Joy 1 claim. Host rocks are massive andesitic volcanics. In 1987, a sample of this pyritized material assayed 1.35 grams per tonne gold (Assessment Report 16794).

Refer to the Joy 2 (104B 210) occurrence for further geological information and a common work history.