The Sin 4,6 occurrence is located in the western head waters of Kayouk Creek, approximately 4.7 kilometres west of the mouth of Easy Inlet.

The region is underlain by Lower Jurassic Bonanza Group intermediate to felsic flows and pyroclastics. Minor calcareous sediments of the Upper Triassic Vancouver Group, Parson Bay Formation are in fault contact with the volcanic rocks. A diorite stock of the Jurassic Island Intrusions occurs at the head of Kashutl Inlet, 7 kilometres northeast.

Locally, occurrences of talc and pyrophyllite are indicated on Figure 5 of Assessment Report 11664. The showings lie in Lower Jurassic Bonanza Group andesitic tuffs and flows. The pyrophyllite is indicated as occurring along two north and northeast trending faults.

A talc occurrence, hosted by similar Bonanza Group rocks, is located at an elevation of 365 metres, about 1.0 kilometre north of the pyrophyllite. No further information is available.

In 1982, BP Minerals completed a program of geological mapping and rock sampling on the area. During 1986 through 1989, Taywin Resources completed programs of geological mapping and geochemical sampling on the area as the Sin 1-7 claims.