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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  02-Mar-1989 by Wim S. Vanderpoll (WV)

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NMI 092L2 Au8
Name MOUNT ZEBALLOS, FARRIS, B.X. (L.1754), J. (L.1757), SPUD (L.1028), S.B. (L.1756) Mining Division Alberni
BCGS Map 092L006
Status Past Producer NTS Map 092L02W
Latitude 050º 00' 44'' UTM 09 (NAD 83)
Longitude 126º 48' 35'' Northing 5542288
Easting 656924
Commodities Gold, Silver, Copper, Lead, Zinc Deposit Types I01 : Au-quartz veins
I06 : Cu+/-Ag quartz veins
Tectonic Belt Insular Terrane Wrangell, Plutonic Rocks
Capsule Geology

The Mount Zeballos past producer lies in the Zeballos gold camp, an area underlain by a Lower Jurassic Bonanza Group Island arc sequence of basaltic to rhyolitic volcanic rocks. Conformably underlying the Bonanza rocks are limestones and limy clastics of the Quatsino and Parson Bay formations, and the tholeiitic basalts of the Karmutsen Formation, all belonging to the Upper Triassic Vancouver Group. Dioritic to granodioritic Jurassic plutons of the Zeballos intrusion phase of the Island Intrusions have intruded all older rocks. The Eocene South Zeballos stock, a quartz diorite phase of the Catface Intrusions, is spatially related to the areas gold-quartz veins. Bedded rocks are predominantly northwest striking, southwest dipping, and anticlinally folded about a northwest axis.

The Mount Zeballos vein and the nearby parallel Farris vein are in narrow but well defined shear zones striking 044 degrees and dipping 90 to 70 degrees east. The veins occur in an assemblage of interbedded Lower Jurassic Bonanza Group tuffs and flows with a few crosscutting narrow greenstone dykes and conformable hornblendite dykes.

Stevenson, in Bulletin 27, separates the tuffs into a feldspar- rich crystal tuff as recognized at the 2250 portal, and feldspar- poor and dacite tuffs, into which the 1900 portal was driven.

Flows are of hornblende-andesite composition and include minor tuff and fine breccia. The breccia ranges from 0.3 to 3.6 metres in width and exhibits strong apple green epidote alteration. Strongest alteration occurs in a zone of large elliptical masses, up to 30 centimetres, of white dacite fragmental lava set in a matrix of fragmental green andesite. Parallel quartz-eyes occur in the dacite. Dacite and feldspar tuffs to the north are altered to lime-silicate rocks. They lie in closer proximity to the quartz diorite South Zeballos stock, which at its closest point lies 2.0 kilometres east of the veins.

Bedded rocks strike northwest and dip southwest at about 45 degrees. The veins occupy shear zones enveloped by bleached host rock. Alteration minerals are sericite, carbonate and coarse pyrite. The Mount Zeballos Vein is locally dichotomous where the main shear zone parallels a second break, 0.3 to 1.2 metres away. A few cross- faults displace the vein by up to 60 centimetres. Vein material consists of ribbon quartz, 5 to 30 centimetres wide but averaging about 6 centimetres. Where the vein is narrow, no ribboning is present, and vein material is brecciated where a change in strike occurs. Coarse calcite or ankerite occur locally in vein centres and is more abundant in the upper levels. Secondary grey cloudy quartz and coarse cubic pyrite are evidence of alteration within the veins. Later generations of quartz veins and calcite veinlets overprint the main vein. Defining the quartz ribbons are fine aggregates of arsenopyrite and pyrite.

Towards the southwest and in the stope faces the vein appears to pinch to near zero but the structure persists. A 2.5 to 10 centimetre wide zone of gouge, calcite and lesser amounts of quartz occurring to the southwest (Lot 1757, J claim) apparently on strike with the Mount Zeballos Vein, may represent the continuation of the structure.

The parallel Farris Vein lies 150 metres southeast of the Mount Zeballos Vein. It is 1.0 to 7.5 centimetres wide and contains discontinuous 1.0 centimetre wide ribbons of quartz. For much of its length the shear zone consists of a less than 2.5 centimetre wide rusty gouge seam with no quartz. Wallrock for up to 0.6 metres distance is sheared and fractured.

The "J Vein", 0.6 kilometres southwest of and on strike with the Farris Vein, may represent its continuation. This vein strikes 058 degrees and dips vertically, and has been traced by surface stripping and underground workings for 145 metres. The 5.0 to 25.0 centimetre wide vein contains quartz, pyrite and arsenopyrite and is hosted in green andesite tuff cut by two north striking feldspar porphyry dykes.

The average grade for mined ore was 12.67 grams per tonne gold, 6.02 grams per tonne silver, with minor values in copper, lead and zinc. Between 1939 and 1944, the Mount Zebellos Mine produced 946,589 grams of gold, 444,399 grams of silver with 2408 kilograms of copper and 12,726 kilograms of lead.

Bibliography
EM EXPL 2002-29-40
EMPR AR 1938-F56; 1939-40,42,87; 1940-27,71,72; 1941-26,69; 1942-20, 23,28,65; 1943-37; 1944-33,41
EMPR BC METAL MM00090
EMPR BULL 20-V, pp. 16-19; *27, pp. 15,83-89
EMPR ENG INSP #61063-61074
EMPR FIELDWORK 1982, p. 290; 1983, p. 219
EMPR INDEX 3-206
EMPR PF (Various Maps and Assays Plans, 1938-1946)
EMR MP CORPFILE (Mount Zeballos Gold Mines Ltd.)
GSC EC GEOL 1-1947
GSC MAP 4-1974; 255A; 1028A; 1552A
GSC MEM 204; 272, pp. 48,62
GSC OF 9; 170; 463
GSC P 38-5; 40-12, p. 17; 69-1A; 70-1A; 72-44; 74-8; 79-30
GSC SUM RPT 1929A; 1932A
CIM Trans. Vol. 42, 1939, pp. 225-237; 1948, pp. 78-85; 72, pp. 116-125
GCNL #118(June 18), 1992
N MINER Apr. 1938, pp. 39-45
Carson, D.J.T., (1968): Metallogenic Study of Vancouver Island with emphasis on the Relationship of Plutonic Rocks to Mineral Deposits, Ph.D. Thesis, Carleton University, Ottawa
Stevenson, J.S., (1938): Lode Gold Deposits of the Zeballos Area
Times Colonist, The New Islander, Feb. 8, 1998, pp. 6-7

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