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File Created: 06-Mar-1991 by Shielagh N. Banfield (SNB)
Last Edit:  12-Jun-1991 by Shielagh N. Banfield (SNB)

Summary Help Help

NMI
Name HANNA (EAST ZONE) Mining Division New Westminster
BCGS Map 092I003
Status Showing NTS Map 092I04E
Latitude 050º 01' 50'' UTM 10 (NAD 83)
Longitude 121º 32' 43'' Northing 5543042
Easting 604188
Commodities Gold, Silver Deposit Types I01 : Au-quartz veins
Tectonic Belt Coast Crystalline Terrane Bridge River, Methow
Capsule Geology

The Hanna (East Zone) is located in the lower reaches of Hanna Creek. Recent trenching is reported on the north side of the creek but the exact location is uncertain.

The area is underlain by a northwest trending belt of lower greenschist facies Permian(?) to Lower Cretaceous Bridge River Complex (Group) phyllites and schists. These occur in normal and fault contact with Bridge River serpentinized ultramafics, and metasediments of the Lower and Middle Jurassic Ladner Group and the Upper Jurassic-Lower Cretaceous Relay Mountain Group. Late Cretaceous granitic plugs and dykes intrude all of the above units.

The showing is underlain by highly foliated graphitic phyllite and fine-grained siltstone cut by a narrow fine-grained mafic dyke. A northwest trending shear zone, up to 3 metres wide and parallel to foliation, is locally silicified and sporadically mineralized. Siltstones are bleached close to shear zones.

Arsenopyrite occurs as disseminations and veinlets in quartz veins concordant to foliation and within narrow silicified shears. The exposed strike length of the shear zone is 150 metres; widths vary from 2 to 5 metres. Fine visible gold is reported in small quartz stringers and oxidized arsenopyrite cavities.

Two samples of mineralized material assayed 0.4 and 17.1 grams per tonne gold respectively (Assessment Report 12028).

Bibliography
EMPR ASS RPT *12028
EMPR EXPL 1983-271
GSC MAP 1010A; 1386A; *42-1989
GSC MEM 262
GSC OF 980
GSC P 46-8; 47-10

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