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File Created: 01-Aug-86 by Allan Wilcox(AFW)
Last Edit:  30-Jul-97 by Keith J. Mountjoy(KJM)

Summary Help Help

NMI
Name VENT, T, SENECA WEST, DOROTHY, SENECA, AGASSIZ-WEAVER, I AM, EARL, TAKI, CAROL Mining Division New Westminster
BCGS Map 092H031
Status Prospect NTS Map 092H05W
Latitude 49º 19' 44" N UTM 10 (NAD 83)
Longitude 121º 57' 52" W Northing 5464534
Easting 575243
Commodities Zinc, Copper, Lead, Silver, Gold Deposit Types G06 : Noranda/Kuroko massive sulphide Cu-Pb-Zn
Tectonic Belt Coast Crystalline Terrane Harrison
Capsule Geology

The Vent prospect is located 1.5 kilometres northwest of the Seneca deposit (092HSW013) along the east side of the Chehalis River, about 9 kilometres north of Harrison Mill, British Columbia.

The Vent zone is 2 kilometres to the northwest along strike from the Kuroko-type Seneca deposit. The Fleetwood and 33 zones (092HSW165), are about 1.5 kilometres northwest of the Vent zone. For further details on the Seneca deposits readers are referred to the article by McKinley et al. (Fieldwork 1994).

The area is underlain by Lower to Middle Jurassic Harrison Lake Formation rocks comprised mainly of pyroclastic flows and tuffs of intermediate to felsic composition. The Vent prospect is underlain by bedded quartz-feldspar crystal lapilli tuffs, multilithic tuff breccias and very fine grained ash tuffs. Most of the rock exposures are described as feldspar and quartz feldspar porphyry units.

Stockwork and stringer sulphides are the dominant style of mineralization in the Vent zone. The stockwork consists of veinlets up to 1 centimetre wide of sphalerite, pyrite and quartz +/- chalcopyrite in strongly altered dacitic flows, breccias, intrusions and mixed lava clast breccia. Also reported but not common, is barite and galena.

Two copper-zinc showings were initially reported, both appearing to be fault bound. The lower showing is bound by quartz feldspar porphyry and the upper showing exposes both feldspar (hornblende) porphyry and quartz feldspar porphyry on its flanks. Fault zones are characteristically less than 0.3 metre in width and carry pyritic, clay gouge. The faults trend north and northwest and appear to be high-angle faults by fracturing and subsequent hydrothermal alteration, including silicification and pyritization.

Alteration in this area is characterized by intense silicification and sericitization associated with massive to flow banded and flow brecciated dacite porphyry. The stockwork veining is restricted to the dacites but alteration extends 10 to 20 metres into surrounding fragmental rocks.

In 1985, drillhole 85-12 intersected mineralization over 9.6 metres which assayed 0.82 gram per tonne gold, 35.91 grams per tonne silver, 4.09 per cent zinc, 1.45 per cent lead and 0.26 per cent copper. Mineralization in drillhole 85-9 yielded an average of 1.69 per cent zinc over 33.53 metres (Assessment Report 14668).

Bibliography
EMPR AR 1897-578; 1898-1113; 1961-88; 1962-93
EMPR EXPL 1975-E62; 1976-E77; 1977-E122; 1978-E141; 1982-165;  1983-234; 1986-C201,202
EMPR FIELDWORK 1984, pp. 120-131; 1985, pp. 95-97; *1993, pp. 345-350  *1994, pp. 503-512
EMPR GEM 1971-265; *1972-102-114; *1973-125-128; 1974-102
EMPR MAP 65 (1989)
EMPR OF 1992-1; 1999-2
EMPR PF (See Seneca - 092HSW013)
EMR MP CORPFILE (Zenith Mining Corporation Ltd.; Chevron Standard  Ltd.)
EMR MIN BULL MR 223 B.C. 111
GSC EC GEOL Vol.60, No.5 (1965), p. 955
GSC MAP 12-1969; 737A; 41-1989
GSC MEM 335, p. 276
GSC P 69-47, p. 67; 86-1B, pp. 715-720
CIM Special Volume 8, p. 101
CJES Vol.10 (1973), pp. 1688-1692
GAC Special Paper 3 (1966), p. 43; 6 (1970), p. 137
GAC Proceedings Vol.16 (1965), p. 63
GCNL #29,#144, 1976; #27, 1977; Dec.14, 1983; Jan.10,Mar.30, 1984;  *#224, 1986; #116(Jun.15), 1990; #44(Mar.4),#157(Aug.15),  #186(Sept.26),#215(Nov.7), 1991; #72(Apr.10),#112(June 10), 1992
GSA Vol.72 (1961), p. 1409
N MINER Mar.18,Jun.3, 1976; *Feb.3, 1986; Aug.5, Sept.9, Oct.7, 1991;  June 22, 1992
Arthur, A.J. (1987): Mesozoic Stratigraphy and Paleontology of the  West Side of Harrison Lake, Southwestern British Columbia, M.Sc.  Thesis, University of British Columbia
Crickmay, C.H. (1925): The Geology and Paleontology of the Harrison  Lake District, British Columbia, Ph.D. Thesis, Leland Stanford  Junior University, California, 140 pp.; (1962): Gross Stratigraphy  of the Harrison Lake Area, British Columbia, Evelyn de Mille Books,  Calgary, Alberta, p. 12
Mahoney, J.B. (1994): Nd Isotopic Signatures and Stratigraphic  Correlations: Examples from Western Marginal Basins and Middle  Jurassic Rocks of the Southern Canadian Cordillera; unpublished  Ph.D thesis, University of British, 289 pages
Pride, K.R. (1973): Mineral Graphic Study of Selected Sulphide  Samples from the Seneca Property near Harrison Mills, British  Columbia, unpub. B.Sc. Thesis, University of British Columbia
Ray, G.E. et al. (1985): Precious Metal Mineralization in  Southwestern British Columbia; Field Guides to Geology and  Mineral Deposits in the Southern Canadian Cordillera, GAC  Section Meeting, Vancouver, British Columbia, May 1985

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