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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  01-Mar-1990 by George Owsiacki (GO)

Summary Help Help

Name VOLUNTEER (L.131) Mining Division Nanaimo
BCGS Map 092F078
Status Prospect NTS Map 092F15E
Latitude 049º 45' 15'' UTM 10 (NAD 83)
Longitude 124º 34' 07'' Northing 5512479
Easting 387012
Commodities Gold, Silver, Copper, Iron, Magnetite Deposit Types K03 : Fe skarn
K01 : Cu skarn
Tectonic Belt Insular Terrane Wrangell
Capsule Geology

The Volunteer occurrence area is predominantly underlain by a sequence of weakly bedded, white to mottled grey recrystallized limestone and sandy limestone beds of the Upper Triassic Quatsino Formation. The limestone is intruded by a teardrop-shaped diorite intrusion 1000 metres long and 400 metres wide. Scattered outcrops of thin basaltic flows and breccia also occur.

Magnetite-garnet-diopside skarn has developed adjacent to the diorite/limestone contacts. The skarns appear to be simple replacements along the borders of the diorite and as masses in areas where they are "embayed" by diorite. Gold values are associated with massive magnetite and associated chalcopyrite, which forms the principal mineralization within the skarn. Subordinate pyrite is also evident.

At the Volunteer showing, an embayed skarn is surrounded on three sides by diorite with the thickest zone of magnetite at or very near the nose of the skarnified rock. From the nose of the skarn zone to the portion where diorite lies only to one side, the skarnification wanes to a series of bands of garnet-diopside skarn and marble parallel to bedding. These bands thin out eventually to unaltered limestone. Within the embayed zone of skarn are large patches of massive marble. The best gold and copper values and the highest magnetite content appear to be restricted to the skarn within a few metres of the diorite. Diamond drilling has revealed that considerable epidote occurs on fracture plane surfaces and as a massive flooding in diorite as well as extending into the limestone.

A rock sample of magnetite-garnet skarn assayed 11.65 grams per tonne gold and 20.56 grams per tonne silver (Assessment Report 14814).

In 1924, an 18-tonne shipment of magnetite ore was sent to Seattle for experimental reasons.

EMPR AR 1897-565; 1900-926; 1904-G302; 1916-K357; 1924-B219
EMPR ASS RPT 5898, *14814, 14827, 18672
EMPR BULL 101, p. 165
EMPR FIELDWORK 1989, pp. 257-265
EMPR OF 1988-28; 1990-3
GSC EC GEOL 3, pp. 86-102
GSC MAP 1386A; 17-1968
GSC OF 463
GSC P 68-50
GSC SUM RPT 1924 Part A, pp. 106-144