Ministry of Energy and Mines
103G
NTS 103G location map (click for index map).

Hecate Strait
NTS 103G

103J

103F & K

 103H

103B & C

Researched and compiled by: L.D. Jones, P.S. Fischl, L.L. Duffett
Release date: April 1989; Updated November 1999

103G Map
Geological Legend
Master & Production Report: 103G; QCI
General Property File
ARIS Map 103G

In this map area, the Hecate Strait separates several large coastal Islands near the mainland and the eastern edge of Graham and Moresby islands (Queen Charlotte Islands). The map contains 48 recorded mineral occurrences.

The Queen Charlotte Islands section occurs within the Insular Belt and is underlain primarily by Triassic to Tertiary volcanics ad sediments. This portion of the map area is frequented by Tertiary epithermal gold deposits occurring in Jurassic volcanics on or near the Sandspit fault. Along the east shore of Graham Island over 22,240 grams of gold were derived from Quaternary beach placers (Bull Swamp (103G 001) and Oeanda (103G 002). These also contained magnetite, titaniferous hematite and ilmenite.

The mainland section lies within the Coast Crystalline Belt and is underlain mainly by igneous rocks of the Cretaceous to Tertiary Coast Plutonic Complex. The Yellow Giant prospects (Kim (103G 021), Bob (103G 024), Discovery (103G 025), Tel (103G 026), and Englishman (103G 030)) on Banks Island are of particular interest. Here, several zones hosting gold and silver have been examined with the skarn-type Main Tel zone, reported to contain 71,349 tonnes of ore grading 14.4 grams per tonne gold. Other notable commodities found in the map area include iron/magnetite, lead, zinc, molybdenum, copper and limestone. 

References:

Geological Survey of Canada (1991): Current research, Part A : Cordillera and Pacific Margin, Geological Survey of Canada, Paper 91-1A.

Geological Survey of Canada (1990): 103G, Hecate Strait, British Columbia, GSC Map 3-1990, Scale 1:250 000.

Geological Survey of Canada (1990): Current research, Part F; Frontier Geoscience Program: Cordilleran and offshore basins, British Columbia, Geological Survey of Canada, Paper 90-1F.

Geological Survey of Canada (1989): Current research. Part H; Frontier Geoscience Program, Queen Charlotte Islands, British Columbia, Geological Survey of Canada, Paper 89-1H.

Geological Survey of Canada (1988): Current research Part E; Cordillera and Pacific margin  of Canada, Geological Survey of Canada, Paper 88-1E.

Haggart, J.W. (1986): Stratigraphic investigations of the Cretaceous Queen Charlotte Group, Queen Charlotte Islands, British Columbia, Geological Survey of Canada, Paper 86-20.

Hesthammer, J., et al (1991): Geology of southern Graham Island (map sheets 103 F/8 and 103 G/5, and parts of map sheets 103 F/7 and 103 F/9), Queen Charlotte Islands, British Columbia, Geological Survey of Canada, Open File 2319.

Lefebure, D.V. (1998): Epithermal Gold Deposits of the Queen Charlotte Islands, BC Ministry of Energy and Mines, Geological Fieldwork 1997, pp. 19-1 - 19-14.

Sutherland Brown, A. (1968): Geology of the Queen Charlotte Islands, BC Ministry of Energy Mines and Petroleum Resources, Bulletin 54.

Tipper, H.W (1985): Jurassic stratigraphy of the Queen Charlotte Islands, British Columbia, Geological Survey of Canada, Bulletin 365.

Woodsworth, G.J. (editor) (1990): Evolution and hydrocarbon potential of the Queen Charlotte Basin, British Columbia, Geological Survey of Canada, Paper 90-10.

BC Geological Survey Branch Publications for NTS 103G

Last Updated May 16, 2007

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