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File Created: 10-Apr-1990 by George Owsiacki (GO)
Last Edit:  29-May-2013 by Karl A. Flower (KAF)

Summary Help Help

NMI
Name AOK Mining Division Nanaimo
BCGS Map 092F019
Status Showing NTS Map 092F01E
Latitude 049º 11' 14'' UTM 10 (NAD 83)
Longitude 124º 13' 13'' Northing 5448985
Easting 411082
Commodities Silver Deposit Types
Tectonic Belt Insular Terrane Wrangell
Capsule Geology

The AOK occurrence is located on the eastern side of Okay Mountain, north east of Nanaimo.

The area is underlain by Paleozoic Sicker Group volcanic rocks and sediments in fault contact with Upper Triassic Karmutsen Formation (Vancouver Group) andesites. Cretaceous sediments of the Nanaimo Group unconformably overlie these rocks.

The occurrence covers faulted north-northwest trending contact zones between Karmutsen Formation basalt and Sicker Group rocks, possibly correlative with the Devonian McLaughlin Ridge Formation of the Cowichan uplift, comprised of strongly foliated argillaceous and pyritic grey to black rusty shales. Cleavage within the shale strikes between 135 to 155 degrees with dips varying between vertical and 72 degrees southwest. Local pods of massive pyrite were observed in the shales. The Karmutsen rocks comprise pillowed and columnar basalt interbedded with 2 to 5 metre thick horizons of finely banded, pyritic chert and a pyritic siliceous tuff. This sequence is folded about an axis plunging 25 to 45 degrees at 285 degrees and the strike of the two limbs are 016 and 030 degrees with 45 and 70 degree dips southwest and northwest respectively.

Numerous quartz-carbonate, carbonate and epidote veinlets and veins occupy fractures in the basalt and parallel the northwest trending structure. Vein attitudes vary between a 130 to 175 degree strike and a 60 degree to vertical dip west. Less common are vertical to steeply north dipping quartz-pyrite filled fractures and shears 1 to 100 centimetres wide that strike 075 degrees.

In 1986, R.R. Gosse completed a program of prospecting. A rock sample from these narrow shears assayed up to 15.76 grams per tonne silver (Assessment Report 15855).

In 1987 through 1991, Goldbank Ventures explored the area as the Bon claims. Programs of geological mapping, geochemical sampling and trenching were completed. In 1994, the former Songbird claims were staked as the Bon Group by B. Donovan. A program of prospecting was completed in 1997.

Bibliography
EMPR ASS RPT *15855, 20028, 21496, 25132
EMPR FIELDWORK 1987, pp. 81-91; 1988, pp. 61-74
GSC MAP 17-1968; 49-1963; 1386A
GSC OF 463; 1272
GSC P 68-50
EMPR PFD 888469, 888674

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