The area of the Terr 1 showing is underlain by granodiorite of Middle to Late Triassic age and is unconformably overlain by conglomerate and black shale of the Lower Jurassic Takwahoni Formation (Laberge Group). These rocks are intruded and locally hornfelsed by dioritic intrusions. These are cut by quartz monzonite, which are probably genetically related to the Paleocene to Eocene Sloko-Hyder Plutonic Complex. Leucocratic felsic dikes and fine- grained mafic dikes cut all three intrusives. A quartz diorite stock of the Late Cretaceous Windy Table Complex intrudes the Takwahoni Formation about 5 kilometres to the northwest.
Widely spaced and generally 5 to 20-centimetre-wide mineralized veins, lie within minor irregular shears or fractures within the granodioritic and dioritic rocks, peripheral to the quartz monzonite intrusion. The minerals include pyrite, chalcopyrite, arsenopyrite and minor galena, sphalerite, pyrrhotite, graphite and tetrahedrite. The adjacent wall rock is generally altered to a rusty weathering, bleached white quartz-sericite-pyrite rock.
Two main mineralized areas are along both sides of a north trending gossanous ridge. In the east mineralized area, a sample from a 20-centimetre vein with arsenopyrite and pyrite assayed 12.1 grams per tonne gold and 86.7 grams per tonne silver (Assessment Report 12695). See Terr (104K 076) for assay value from the west mineralized area.
In 1982, the twenty-unit TERR 1 claim was staked, and reconnaissance mapping and sampling was carried out at the time indicated a system of precious metal enriched sulphide bearing quartz veins within a complex intrusive environment. Work was completed by J.C Stephen Explorations Ltd. And funded by Newex Syndicate. Eighteen samples were assayed for gold and silver and 25 geochemical samples were analysed for gold and silver. Assays and descriptions are given for rock, silt, soil, and talus fines samples are given in the report appendices (Assessment Report 11265).
In 1984, Newmont Ex. of Canada carried out geological mapping on the Terr 1 claim using an enlargement of the air photo (scale approximately 1:8000). Additional geochemical sampling, including ten rock samples and two talus samples were collected and analyzed for gold and silver (Assessment Report 12695).
