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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  26-Oct-12 by Garry J. Payie(GJP)

Summary Help Help

NMI
Name ZIPPA, ZIP Mining Division Liard
BCGS Map 104B064
Status Showing NTS Map 104B11W
Latitude 56º 39' 12" N UTM 09 (NAD 83)
Longitude 131º 18' 36" W Northing 6281183
Easting 358385
Commodities Nepheline Syenite, Feldspar, Titanium Deposit Types R13 : Nepheline syenite
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The area of the Zippa occurrence deposits is underlain by Early Jurassic rock of the Zippa Mountain Plutonic Complex that has intruded ranges compositionally from leuco-syenite to mafic syenite and pyroxenite (G. Ray, personal communication, 1995).

The peak of Zippa Mountain is comprised of a nepheline syenite intrusion that is nearly 4.8 kilometres long. It is composed of dark grey feldspar phenocrysts in a matrix of white mica with altered orthoclase, minor alibte, titanite, biotite and a yellowish brown garnet.

In some places the porphyritic texture is not pronounced and the rock is nearly equigranular and somewhat gneissic. A thin section of this material showed 70 per cent orthoclase with some microperthite, 10 per cent nephelite (nepheline) and considerable amounts of biotite, brown garnet and magnetite (Geological Survey of Canada Memoir 246, page 51).

This porphyry intrudes Permian and older volcanics and sediments. Near the contact, the porphyry appears dark green and is very difficult to distinguish from the altered country rock. A thin section of one of the contact phases showed it to be comprised mainly of green augite with 10 to 20 per cent interstitial orthoclase and some color- less garnet. Another sample consisted of augite crystals up to 2.5 centimetres in length, about 10 per cent titanite (sphene) and a matrix of 20 to 50 per cent orthoclase (Geological Survey of Canada Memoir 246, page 51).

In 1987, samples from the nepheline syenite were described as consisting of 95 per cent potassium feldspar, which were tabular crystals averaging about 10 millimetres in length, and about 5 per cent augite. Another sample of the intrusive hosted prismatic to acicular nepheline with no visible sulphides (Assessment Report 16954).

Whitegold Resources held the Zippa nepheline syenite (potassium feldspar) deposit along with its wollastonite deposits (104B 384). The Zippa Mountain pluton consists of a core of silica-undersaturated syenite containing greater than 90 per cent potassium feldspar with minor amounts of pyroxene, apatite, biotite, and titanite. To 1997, two holes had been drilled (1996-1997) in the core of the pluton by Whitegold to examine the potassium feldspar. Results were not published.

By 2012, the Zippa Mountain deposits were held by North Bay Resources Inc.

See Iskut Wollastonite (104B 384) for a description of associated carbonates with wollastonite deposits and for a common work history.

Bibliography
EMPR ASS RPT *16954, 19834, 24931, 25449
EMPR OF 1987-17, p. 93; 1991-10
GSC MAP 9-1957; 311A; 1418A
GSC MEM *246, p. 51
GSC P 89-1E, pp. 145-154
GCNL #29 (Feb.11), #55 (Mar.19), 1998
Anderson, R.G., (1988): A Paleozoic and Mesozoic Stratigraphic and Plutonic Framework for the Iskut Map area (104B), Northwestern British Columbia, pp. A1-A5, in Geology and Metallogeny of Northwestern British Columbia, Smithers Exploration Group, G.A.C. Cordilleran Section Workshop, October 16-19, 1988

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