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File Created: 20-Nov-1992 by Keith J. Mountjoy (KJM)
Last Edit:  21-Dec-2020 by Karl A. Flower (KAF)

Summary Help Help

NMI
Name GRAVY EAST, GRAVY (EAST), GRAVY 1-2, SAM 1-4, JESSYE 1-3 Mining Division Omineca
BCGS Map 094E036
Status Showing NTS Map 094E07W
Latitude 057º 23' 26'' UTM 09 (NAD 83)
Longitude 126º 55' 24'' Northing 6362768
Easting 624817
Commodities Lead, Zinc, Copper, Silver Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The Gravy East showing is 1.75 kilometres south of Toodoggone Lake and 3.25 kilometres east-northeast of the Mount Graves prospect (094E 087) (Assessment Report 17226). Smithers is 290 kilometres to the south.

The Gravy East showing is situated within a Mesozoic volcanic arc assemblage which lies along the eastern margin of the Intermontane Belt, a northwest-trending belt of Paleozoic to Tertiary sediments, volcanics and intrusions bounded to the east by the Omineca Belt and to the west and southwest by the Sustut and Bowser basins.

Permian Asitka Group crystalline limestones are the oldest rocks exposed in the region. They are commonly in thrust contact with Upper Triassic Takla Group andesite flows and pyroclastic rocks. These Takla rocks have been intruded by plutons and other bodies of the mainly granodiorite to quartz monzonite Early Jurassic Black Lake Suite and are in turn unconformably overlain by or faulted against Lower Jurassic calcalkaline volcanics of the Toodoggone Formation, Hazelton Group.

The dominant structures in the area are steeply-dipping faults which define a prominent regional northwest structural fabric trending 140 to 170 degrees. In turn, high-angle, northeast-striking faults (approximately 060 degrees) appear to truncate and displace northwest-striking faults. Collectively these faults form a boundary for variably rotated and tilted blocks underlain by monoclinal strata.

The Gravy East showing lies within a granodiorite stock of the Black Lake Suite near its contact with undivided volcanics of the Hazelton Group. Hazelton volcanics consist of grey, green and purple andesitic flow and pyroclastics of the Hazelton Group. Bedding strikes northwest and dips moderately to the northeast. Numerous pink feldspar porphyry dikes and sills are associated with the volcanics. Numerous other small granodiorite stocks and plugs crop out in the area.

Abundant disseminated pyrite occurs in contact areas between volcanics and intrusive rocks. These are evident as prominent gossans, some of which also contain quartz veins and/or silica veins and breccias.

At the Gravy East showing quartz breccia hosts galena, sphalerite and minor chalcopyrite with associated malachite. The zone strikes 340 degrees. Quartz occurs as stringers with rusty vugs. Several of the vugs (up to 5 millimetres) display well developed quartz crystals with dogtooth textures. The breccia material is composed of diorite cemented by quartz.

Because the showing lies outside of the Gravy claims there was little sampling done on this quartz breccia system. Of two samples that were taken, assay results were poor. Sample MG-87-3 yielded 0.005 gram per tonne gold and 0.3 gram per tonne silver (Assessment Report 17226).

In 2003, a sample (133981) of granodiorite/diorite from the Gravy East area assayed 2.7 grams per tonne silver and 0.300 per cent zinc, and a float sample (133984) of quartz-carbonate veining with epidote yielded 2.1 grams per tonne silver and 0.192 per cent copper (Assessment Report 27441).

Work History

The Gravy claims were previously held by Hemlo Explorations Ltd. Work on the property in 1985 consisted of grid and contour soil sampling in selected areas. The exploration program on the Gravy II and IV claims in 1985 consisted of wide-spaced contour soil sampling and grid soil sampling in two areas at the southwest corner of the property (Assessment Report 14436). Work in 1987 for Mt. Graves Explorations Inc included reconnaissance geological mapping, stream and grid soil sampling. This work resulted in the discovery of anomalous precious metal values in rocks, silts and soils (Assessment Report 17226).

In 2003 Stealth Minerals conducted a property-wide airborne geophysical magnetic and electromagnetic survey over the Sam property which covered the following occurrences: Graves (GWP)(094E 087), Yellow Rose (094E 203), Gravy (094E 205), Gravy East) (094E 206), TO 2 (094E 212) and Duke (094E 218). Rock sampling was done in the showing vicinity also. In 2004, the company completed minor sampling on the Sam claims.

See Gravy (094E 205) and GWP (Graves)(094E 087) for related details and work history.

Bibliography
EMPR ASS RPT 9502, 10050, 13458, *14436, 14824, *17226, 17455, *24993, *27441, 27734
EMPR BULL 86
EMPR EXPL 1975-E163-E167; 1976-E175-E177; 1977-E216-E217; 1978-E244-E246; 1979-265-267; 1980-421-436; 1982-330-345; 1983-475-488; 1984-348-357; 1985-C349-C362; 1986-C388-C414; 1987-C328-C346; 1988-C185-C194
EMPR FIELDWORK 1980, pp. 124-129; 1981, pp. 122-129, 135-141; 1982, pp. 125-127; 1983, pp. 137-138, 142-148; 1984, pp. 139-145, 291-293; 1985, pp. 299-300; 1986, pp. 167-174; 1987, pp. 111, 114-115; 1989, pp. 409-415; 1991, pp. 207-216
EMPR GEM 1969-103; 1971-63-71; 1973-456-463
EMPR GEOLOGY 1977-1981, pp. 156-161
EMPR MAP 61 (1985); 65 (1989)
EMPR OF 2004-4
EMPR PF (Photogeologic Interpretation Map of the Northern Omineca area, Oct. 1964, Canadian Superior Exploration Limited-in 94E General File; Prospectus, (Aug.10, 1989), Aatra Resources Ltd.)
GSC BULL 270
GSC OF 306; 483
GSC P 76-1A, pp. 87-90; 80-1A, pp. 27-32; 80-1B, pp. 207-211
GSC MAP 14-1973
W MINER April, 1982
N MINER Oct.13, 1986
N MINER MAG March 1988, p. 1
GCNL #23(Feb.1), 1985; #165(Aug.27), 1986
IPDM Nov/Dec 1983
ECON GEOL Vol. 86, pp. 529-554, 1991
MIN REV September/October, 1982; July/August, 1986
WIN Vol. 1, #7, June 1987
Forster, D.B. (1984): Geology, Petrology and Precious Metal Mineralization, Toodoggone River Area, North-Central British Columbia, Unpub. Ph.D. Thesis, University of British Columbia
Diakow, L.J. (1990): Volcanism and Evolution of the Early and Middle Jurassic Toodoggone Formation, Toodoggone Mining District, British Columbia, Ph.D. Thesis, University of Western Ontario
EMPR PFD 830397, 830398

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