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File Created: 04-Dec-94 by George Owsiacki(GO)
Last Edit:  30-May-97 by Keith J. Mountjoy(KJM)

Summary Help Help

NMI
Name PILLDOLLA, CAVE, CLIFF AREA Mining Division Vancouver
BCGS Map 092K030
Status Prospect NTS Map 092K08E
Latitude 50º 17' 52" N UTM 10 (NAD 83)
Longitude 124º 07' 16" W Northing 5572341
Easting 420152
Commodities Gold, Silver, Copper, Lead, Zinc Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Coast Crystalline Terrane Gambier, Plutonic Rocks
Capsule Geology

The Pilldolla occurrence is located near the headwaters of Pilldolla Creek. The small community of Egmont is 60 kilometres south and Princess Royal Reach at the head of Jervis Inlet is 10 kilometres southeast.

The Pilldolla property is located in a northwest trending roof pendant comprised of Lower Cretaceous Gambier Group volcanic and sedimentary rocks, within the Jurassic to Cretaceous Coast Plutonic Complex. Quartz mica schist, quartz chlorite schist, biotite schist, marble and limestone occur on the property. Intercalated with the quartz mica schist are bands of undifferentiated siliceous metavolcanic and metasedimentary rocks that are locally hornfelsed with local skarn development. Coast Plutonic Complex rocks are granodiorite to quartz monzonite in composition. Near the pendant contacts, the granodiorite is occasionally strongly silicified and/or argillic altered with up to 10 per cent disseminated pyrite. Small irregular quartz sweats occur locally with variable amounts of coarse-grained pyrite.

A prominent west-northwest trending, moderately dipping shear extends for over 1000 metres on the east side of the headwaters of Pilldolla Creek. This shear crosscuts both Gambier Group rocks and Coast Plutonic Complex rocks and lies uphill to the north from a train of numerous subangular to subrounded mineralized boulders. The boulders commonly contain fine to coarse grained pyrite with disseminations and blebs of chalcopyrite. Less commonly galena, pyrrhotite and sphalerite occur.

The shear separates an expansive limestone-marble-siliceous metavolcanic assemblage to the north from strongly gossanous quartz mica schists/siliceous metavolcanics in the Cliff Area. Several hundred metres to the east, the structure passes from Gambier Group rocks into Coast Plutonic Complex rocks at the Cave zone.

Mineralization at the Cave zone consists of fine to coarse grained pyrite within the shear which varies from 1 metre wide at its west end to 3 metres at the east end. Rocks hosting this structure are granodiorite of the Coast Plutonic Complex. Continuous chip sampling over varying widths of the shear along its strike yielded up to 775 parts per billion gold across 65 centimetres. The highest value obtained from the Cave zone was from a piece of float directly below the mineralization in the overhanging cliff. This sample analysed 12.6 grams per tonne gold, 2.15 per cent copper and 107.9 grams per tonne silver (Assessment Report 23233).

In 1994, 15 rock samples were taken from the west end of the Cave zone and extending about 15 metres along the western part of the shear. Grab sample 54164, taken at the west end of the Cave zone, yielded 0.68 gram per tonne gold, 14.3 grams per tonne silver and 0.33 per cent copper (Assessment Report 23897). This sampling has completed 80 metres sampling along the Cave zone shear.

From the base of the cliffs near the bottom of the Cliff Area and Cave zone, 12 samples of mineralized schist yielded values greater than 1 gram per tonne gold; copper values range up to 0.91 per cent. One select grab of mineralization from a single boulder analysed 20.3 grams per tonne gold, 548.4 grams per tonne silver and 10.25 per cent lead (Assessment Report 23233, page 13).

Bibliography
EMPR ASS RPT *23233, *23897
EMPR PF (R.H. McMillan, Mineral Potential Report, Feb. 1994)
GSC MAP 65A; 169A; 1386A
GSC OF 463; 480

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