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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  01-Apr-2009 by Shea Sweene (SSW)

Summary Help Help

NMI
Name SIBOLA MOUNTAIN, WEST VIEW, SIBOLA EAST, SIBOLA WEST Mining Division Omineca
BCGS Map 093E075
Status Prospect NTS Map 093E14E
Latitude 053º 45' 15'' UTM 09 (NAD 83)
Longitude 127º 11' 06'' Northing 5957700
Easting 619666
Commodities Gold, Silver, Zinc, Lead, Copper, Molybdenum Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The Sibola Mountain property is underlain predominantly by massive, fragmental and tuffaceous andesites, andesite porphyry, minor porphyritic dacite and welded rhyolite tuff of the Lower Jurassic Telkwa Formation (Hazelton Group). Hornblende biotite granodiorite of the Late Cretaceous Bulkley Intrusions is exposed in the northern portion of the property and locally, the andesitic units are altered to biotite hornfels. Late post-mineralization aplite dikes intrude all of the units.

Two parallel, northwest striking and near vertical dipping mineralized zones are hosted in andesite and exposed by trenches near the centre of the property. The mineralized zones are 259 metres apart and are called the Sibola West and Sibola East zones.

The Sibola East zone (formerly the West View) is characterized by pyrite-sphalerite mineralization present as stockwork stringers and thin lenses accompanied by sulphide-rich quartz stringers and veins. Minor amounts of chalcopyrite, molybdenite and galena are also evident. The wallrock andesite is silicified and sericitized. Resampling of the discovery trench yielded 6.5 grams per tonne gold, 49.3 grams per tonne silver and 10.1 per cent zinc over 0.9 metre. Nine drillholes delineated the Sibola East zone over a strike length of approximately 61 metres to a vertical depth of 47 metres. The drilling yielded erratic but strongly anomalous to significant gold, silver and zinc values over narrow widths; the deepest hole assayed 11.4 grams per tonne gold, 70.9 grams per tonne silver and 3.37 per cent zinc over 2.29 metres of core length. The zone is open along strike to the southeast and to depth (Assessment Report 18907).

The Sibola West zone consists of diffuse phyllic alteration with several per cent disseminated pyrite enveloping a massive pyrite-pyrrhotite lens exposed in a trench. The highest gold value obtained was 2.0 grams per tonne.

A bulk sample from a surface trench from the Sibola East zone containing massive sphalerite and pyrite with minor chalcopyrite was sent for metallurgical testing. Head assays reveal that the ore contains considerable gold and silver values in addition to zinc, minor copper and lead (Assessment Report 23112).

Bibliography
EMPR AR 1916-K163
EMPR ASS RPT 15786, 16578, *18907, 23112
EMPR BULL 75, pp. 53,69
EMPR OF 1989-1; 1994-14
EMPR PF Rimfire (Hawthorne, N. (1967-01-01): List of Projects and notes - Whitesail Lake Project; unknown (unknown): Sample location map - Whitesail Project)
GSC MAP 367A; 1064A
GSC MEM 299
GSC OF 708
GSC P 72-1A; 79-1A
GSC SUM RPT 1924, Part A
Placer Dome File

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