MINFILE Mineral Inventory

MINFILE Record Summary

MINFILE No 104P 110

File Created:	02-Nov-1988	by	Dorthe E. Jakobsen (DEJ)
Last Edit:	08-Jun-2023	by	Karl A. Flower (KAF)

SUMMARY

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		NMI
Name	DOROTHY, GO	Mining Division	Liard
		BCGS Map	104P022
Status	Showing	NTS Map	104P04E
Latitude	059º 14' 54''	UTM	09 (NAD 83)
Longitude	129º 37' 23''	Northing	6567871
		Easting	464462
Commodities	Gold, Silver	Deposit Types	I01 : Au-quartz veins
Tectonic Belt	Omineca	Terrane	Slide Mountain, Cassiar

Capsule Geology

The Dorothy vein, located 4.4 kilometres north-northeast of the Erickson gold mine vein package (MINFILE 104P 029), is approximately 13 kilometres southeast of the town of Cassiar in northern British Columbia.

The property lies within the Sylvester Allochthon situated on the northeastern margin of the Early Cretaceous Cassiar Batholith. The Sylvester Allochthon is a fault-bound imbricate assemblage of Mississippian to Triassic regionally metamorphosed (greenschist facies) oceanic rocks thrust over sediments of autochthonous North America. The assemblage in this area comprises greenstones, basaltic to andesitic flows, pyroclastics, ultramafics and tuffs of the Pennsylvanian to Permian Slide Mountain Complex, and Upper Triassic Slide Mountain Complex argillites.

Along the argillite-volcanic contact, a basal Mississippian to Permian detachment surface, is a well-developed listwanite horizon with associated flat-lying quartz veins and stringers. The Dorothy vein, however, dips steeply northward and is hosted by metavolcanics. The vein was exposed along strike for 21 metres with an average thickness of 0.65 metre in a trench (21 by 1 by 1 metres) along the Finlayson Road. An envelope of carbonate alteration and iron enrichment occur on either side of the quartz vein within the volcanics.

A chip sample taken over a 6-metre interval assayed 8.7 grams per tonne gold and 42.5 grams per tonne silver (Assessment Report 15059).

Work History

In 1986, Erickson Gold Mining Corporation established a grid and collected 820 soil samples for analyses in addition to road clearing and trenching.

During 2008 through 2010, Hawthorne Gold Corp., later China Minerals Mining Corp., completed regional programs of geological mapping, geochemical (rock and soil) sampling and 11,657 line-kilometres of airborne magnetic, radiometric and electromagnetic surveys on the area as the Cassiar Gold property.

In 2019, Margaux Resources completed a program of prospecting, geological mapping and rock sampling on the area as the Cassiar Gold property. In 2020, Cassiar Gold Corp. completed a program of regional photogeological interpretation, prospecting and rock sampling on the Cassiar Gold property.

Bibliography

EMPR ASS RPT *15059, 30623, 31396, 31397, 32483, 38989, 39350

EMPR BULL 83

EMPR EXPL 1986-C463

EMPR FIELDWORK 1988, pp. 339-344

EMPR OF 1996-11

EMPR PF (Boronowski, A. (1988): Erickson Gold Camp, Geology and Metallogeny of Northwestern British Columbia, Smithers Exploration Group-G.A.C. Cordilleran Section, Workshop Oct. 16-19, 1988, pp. A10-A21; Nelson, J. and Bradford, J. (1988): Late Paleozoic Marginal Basin and Island Arc Environments in the Sylvester Allochthon and Structural Framework of Mineralization in the Cassiar-Erickson Camp, Geology and Metallogeny of Northwestern B.C., Smithers Exploration Group-G.A.C. Cordilleran Section, Workshop Oct. 16-19, 1988, p. A72-73)

EMPR PFD 674351

GSC MAP 381A; 1110A

GSC MEM 194; 319

GSC OF 2779

Harms, T.A. (1986): Structural and Tectonic Analysis of the Sylvester Allochthon, Northern B.C., Implications for Paleogeography and Accretion (Ph.D. Thesis, U. of Arizona)

Dussell, E. (1986): Listwanites and Their Relationship to Gold Mineralization at Erickson Mine, B.C., Canada (M.Sc. Thesis, Western Washington University)