Location: Northern British Columbia (Atlin Mining District)
Minerals: Au, Ag
Ownership: 100% Gray Rock
Size: 117.9 ha
The Tardis property is located in Northern British Columbia, 118 Km southeast of Atlin and 151 Km east of Dease Lake.
In 1981, the area was staked as the Tardis claims by Chevron Canada Resources Limited during which time 33 soil and 17 rock samples were collected. In 1982, 39 rock samples were collected on a north-south grid.
The ground was re-staked in 1987 on behalf of Tahltan Holdings Ltd. Geological mapping was carried out over the centre portion of the property. Rock chip sampling of quartz, barite, fluorite and calcite veins and stockwork and of hydrothermal alteration zones and all sulphide bearing rocks was carried out over the areas mapped. A total of 30 rock samples were sent for analysis. An extensive alteration zone was identified along the King Salmon Thrust Fault on the Tardis property. The alteration comprises silicification, fluoritization, carbonatization and barite. Highly anomalous arsenic, antimony, mercury and barium levels occur in both rock and soil samples collected from this zone. Previous work by Chevron delineated gold values of up to 1060 ppb in soils over this zone. An epithermal signature is suggested.
The Tardis area is astride the King Salmon thrust fault which strikes west-northwest and dips approximately 45 degrees to the northeast. Upper Triassic Sinwa Formation limestone is interpreted to have been thrust from the northeast over the Lower Jurassic Laberge Group, Takwahoni Formation. Structurally conformable on the Sinwa Formation is the Jurassic Inklin Formation sediments.
The Jurassic sedimentary rocks both above and below the thrust fault have a prominant northwest strike. A younger, post-Jurassic system of north to northeast fractures and small faults disrupts all units. Silicification, clay alteration, carbonitization, and fluoritization are locally concentrated along the
King Salmon thrust fault at intersections with the north to northeast structures.
The Sinwa Formation lies immediately above the King Salmon thrust fault. The Sinwa limestone is divided into two mappable units. The lower unit is variably silicified and brecciated and contains fluorite veinlets associated with zones of intense alteration. Colourless, honey, purple, and blue varieties of fluorite are present. The upper unit is calcareous and contains an abundant white fibrous mineral of unknown identity as well as numerous sinkholes