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File Created: 29-May-1990 by George Owsiacki (GO)
Last Edit:  12-Jun-2020 by Karl A. Flower (KAF)

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NMI 092G11 Ag1
BCGS Map 092G065
Status Developed Prospect NTS Map 092G11E
Latitude 049º 38' 07'' UTM 10 (NAD 83)
Longitude 123º 01' 45'' Northing 5498081
Easting 497894
Commodities Gold, Silver, Copper, Zinc, Lead Deposit Types G06 : Noranda/Kuroko massive sulphide Cu-Pb-Zn
I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Coast Crystalline Terrane Gambier, Plutonic Rocks
Capsule Geology

The Maggie (Slumach, Portal Two) occurrence is located approximately 11 kilometres south east of Squamish, British Columbia, in the north western head waters of the Indian River, at an elevation of 870 metres. The War Eagle (Adit 1, Portal One) occurrence (MINFILE 092GNW042) is located approximately 1.1 kilometres to the north west.

The area occurs on the eastern edge of the Britannia-Indian River pendant, which hosts the volcanogenic deposits of the Britannia camp. The Britannia-Indian River pendant is mainly a calc-alkaline, sub-aqueous volcanic and sedimentary sequence of felsic to intermediate pyroclastics, flows, cherts, argillites and greywackes. The entire pendant has been assigned to the Lower Cretaceous Gambier Group. Jurassic to Cretaceous Coast Plutonic Complex intrusions surround portions of the stratified rocks creating screens or pendants; these bodies are oriented north westerly throughout the Coast complex. Pliocene to recent Garibaldi Group basaltic dikes and sills intrude both the pendant and plutonic rocks.

The occurrence area is underlain by rocks of the lower Gambier Group. A basal sequence, at least 350 metres thick, consists of a north- striking succession of felsic flows interbedded with shale, tuff breccia and lapilli tuff. Dips are steeply west and east. The top of this sequence is truncated by granodiorite, which serves as a partition from six major overlying units that form a continuous stratigraphic package at least 2.5 kilometres thick. The succession dips moderately south-southwest and is described from oldest to youngest as follows. Unit 1, with a minimum thickness of 25 metres, consists of lower intermediate tuffs and flows comprised of dark green, massive andesitic to dacitic tuffs with minor intermediate flows. Unit 2 consists of felsic tuffs, flows and sedimentary interbeds lying conformably above Unit 1 and comprises a 750- metre thick felsic tuffaceous succession with argillite and chert beds. Numerous cycles of explosive volcanism are indicated by the repeated layers of coarse tuff breccia with fragments up to tens of centimetres across. The middle of this unit is dominated by numerous shale and tuffaceous chert horizons. The rhyolite breccia at the War Eagle adit is at the stratigraphic top of these sediments. The hornfelsed upper part of Unit 2 hosts the Slumach gold zone (MINFILE 092GNW036). In Unit 3, massive intermediate to mafic flows form resistant bluffs and comprise massive, dark green intermediate flows that total 150 metres in thickness. In Unit 4, felsic tuffs, sediments and intermediate interbeds conformably overlie the massive flows of Unit 3. A thick felsic tuffaceous series with several intermediate interbeds has a total thickness varying from a minimum of 150 metres to greater than 650 metres. The lithology consists generally of thin to massive beds of ash to lapilli tuff interlayered with thin shale or greywacke beds. Extensive intermediate to mafic volcanic units inter-finger with the above felsic rocks and consist of hornblende and pyroxene porphyritic mafic flows. In Unit 5, massive volcanics consist of intermediate tuffs and flows and interbedded felsic tuffs and fine ash beds. Unit 6 consists of upper felsic tuffs and overlying undifferentiated units conformably overlying Unit 5.

Three major types of Coast Plutonic Complex intrusive bodies intrude the volcano-sedimentary sequence: a diorite pluton, the Early Cretaceous Squamish granodiorite pluton and several small quartz feldspar porphyritic rhyodacite bodies. Locally, the diorite is strongly foliated and metamorphosed up to the lower amphibolite facies near the contact with the granodiorite. The Squamish pluton often has faulted contacts where it intrudes the earlier diorite. The porphyritic rhyodacite intrusions are small massive dikes and bodies that intrude the plutons. Garibaldi Group basaltic dikes intrude the Gambier Group rocks and plutonic bodies.

The entire Britannia-Indian River pendant exhibits lower greenschist facies regional metamorphism that has little effect on the felsic units but renders the units of intermediate composition massive and difficult to distinguish as tuffs or flows. A common alteration mineral assemblage includes chlorite-epidote-quartz- sericite┬▒zeolite. Lower amphibolite- grade metamorphism within the diorite pluton is evident peripheral to the Squamish granodiorite. The Squamish granodiorite pluton has been dated as Early Cretaceous (114 Ma ┬▒ 40 Ma) using a two-point rubidium-strontium isochron (Fieldwork 1987). Contact metamorphic hornfels is widespread in mineralized areas peripheral to the plutons. Pervasive purplish- brown secondary biotite development is often accompanied by silicification and chloritization. The hornfels is easily distinguished in hand specimens by pale- brown, ovoid porphyroblasts (cordierite with quartz) with a dark- brown biotitic groundmass.

West of the Indian River, bedding strikes northwest, dips southwest and shows numerous tops facing southwest. Near the War Eagle occurrence, bedding is flat to gently southwest- dipping. East of the Indian River, bedding strikes northwest and dips steeply northeast. The dip reversal is interpreted as an anticline that is tilted to the northeast. A pervasive axial plane cleavage strikes northwest and dips steeply to the southwest. Cleavage and bedding attitudes in the west half of the Indian River valley indicate the axis of the anticline lies to the northeast and has a shallow northwest plunge. A second cleavage striking north and dipping moderately to the west is axial planar to minor folds with steep northwest- plunging axes. Faults and shears generally strike north to northwest but northeast- trending structures have also been mapped.

Mineralization on the Maggie property includes: (1) a volcanogenic system with low-grade stratiform layers and some crosscutting stringer zones (War Eagle); and (2) higher grade gold mineralization in quartz-chlorite veins cutting hornfels (Slumach zone). The Maggie property has five mineralized zones; the Belle (MINFILE 092GNW014), A.B.C. (MINFILE 092GNW028), Christina (MINFILE 092GNW041), War Eagle (MINFILE 092GNW042), and Slumach. These occurrences are all on, or close to, the Indian River shear zone, a discontinuous zone of shearing that trends northwest along the Indian River valley.

Mineralization at Adit 2 or Portal Two (Slumach zone) consists of two quartz-chlorite veins, which cut an intensely hornfelsed zone characterized by pervasive biotitization, local silicification and development of chlorite and cordierite. The Main and East veins of the Slumach zone trend northwest and dip steeply northeast. They are mineralized with up to 15 per cent sulphides, primarily pyrite, sphalerite, chalcopyrite and traces of galena in a brecciated and silicified wallrock gangue. The sulphides appear to have been re-brecciated and cemented by quartz. Fragments of wallrock within the vein are totally biotitized or chloritized and have cockscomb quartz envelopes. Both veins consist of a higher grade (gold-silver) vein, approximately 1 metre wide, with lower grade, altered hanging-walls and footwalls. The wall rocks are intensely hornfelsed tuffaceous sediments of Unit 2 or felsic lapilli tuffs. Numerous late, dark- green andesitic dikes and felsic dikes cut the zone at varying angles.

The main (Slumach) vein varies from 30 to 70 centimetres wide over its 70 metres known length. It strikes 320 degrees and dips 70 degrees to the north east. Free gold has been reported and an association of gold within pyrite and chalcopyrite has been determined. The vein has been delineated by drilling over a strike length of 150 metres and 55 metres down dip. The East vein, located 9 metres east of the Slumach vein, is at least 20 metres long and varies from 30 to 200 centimetres in width. It is parallel to the main vein and dips 60 degrees north east.

A second zone of mineralization referred to as the Slumach Horizon or Slumach Rhyolite, located approximately 150 metres south west of the veins, consists of quartz with galena, sphalerite, pyrite and coarse euhedral barite and lies above the Slumach zone; however, its extent is not known.

In 1983, sampling of the discovery outcrop assayed up to 10.0 per cent zinc and 34.2 grams per tonne gold over 0.7 metre; while sampling of the Creek zone to the west, yielded up to 9.2 per cent zinc and 1.7 grams per tonne gold over 0.8 metre (Assessment Report 17194).

In 1987, nine channel samples from the Portal Two sub-drift of the main vein yielded an average of 65.6 grams per tonne gold over a 31 centimetre width (Fieldwork 1987). Diamond drilling, performed the same year on the Slumach horizon zone, yielded: 0.071 per cent copper, 1.63 per cent zinc, 1.39 per cent lead, 12.3 grams per tonne silver and 1.02 per cent barium over 0.6 metre in hole MM-07; 0.45 per cent copper, 1.8 per cent zinc, 13.6 grams per tonne silver and 4.6 grams per tonne gold over 0.6 metre in hole MM-09; 4.32 per cent zinc, 112 grams per tonne silver and 0.83 gram per tonne gold over 0.5 metre in hole MM-10; 0.28 per cent copper, 4.75 per cent zinc, 8.0 grams per tonne silver and 7.39 grams per tonne gold over 1.0 metre in hole MM-12 and 3.3 grams per tonne gold, 18.1 grams per tonne silver and 3.6 per cent zinc over 1.5 metres in hole MM-06 (Assessment Report 17194). The following year, a drill hole intersection across 1 metre of the Slumach horizon assayed 253.3 grams per tonne gold, 274.2 grams per tonne silver, 0.28 per cent copper, 4.75 per cent zinc and 0.38 per cent lead (George Cross News Letter #230, 1988).

In 2001, rock samples (Y0181810 and T0181812) from road exposures yielded up to 0.20 gram per tonne gold, 48.6 grams per tonne silver, 0.35 per cent copper, 3.86 per cent lead and 1.43 per cent zinc (Assessment Report 26789). In 2009, a rock sample (813258) from a quartz-sulphide vein in an open-cut assayed 0.743 per cent copper, 0.295 per cent zinc, 10.9 grams per tonne silver and 4.93 grams per tonne gold, while select dump samples (813264 to 813272) yielded up to 2.23 per cent copper, 14.3 per cent zinc, 68.9 grams per tonne silver and 103.6 grams per tonne gold (Assessment Report 31070). In 2015, a rock sample (15JHP104) from the an open cut on the discovery showing assayed 45.8 grams per tonne gold, 26.6 grams per tonne silver and greater than 1 per cent copper and zinc (Assessment Report 36023).

In 1984, bulk sampling totalling 62.2 tonnes yielded an average of 36.0 grams per tonne gold, 106.5 grams per tonne silver, 1.07 per cent copper, 0.10 per cent lead and 4.41 per cent zinc (Assessment Report 31070).

In 1987, an inferred resources estimate of 8,145 tonnes averaging 13.7 to 17.1 grams per tonne gold was reported by International Maggie Mines (Assessment Report 31070).

The area has been explored sporadically by a number of companies for many years and has long been recognized as having good potential for hosting economic mineralization similar to the nearby Britannia (MINFILE 092GNW003) deposits and War Eagle (MINFILE 092GNW042) occurrence. In 1981 and 1982, International Maggie Mines Ltd. completed programs of soil sampling and prospecting on the area. In 1983, the Slumach vein (Maggie, MINFILE 092GNW036) was discovered approximately 1.1 kilometres south east of the War Eagle adit during a follow-up of several soil anomalies. A 55-metre crosscut, a raise and an 18-metre drift were driven, but mineable widths of mineralization were not intersected. In 1987, Minnova entered into an option agreement with International Maggie Mines and completed six diamond drill holes, totalling 657.5 metres, on the Slumach zone. In 1990, a program of geological mapping was completed. In 2001, the area was prospected and rock sampled as the Elena and Tonino claims by Donegal Developments. In 2009, the area was prospected and rock sampled as the Slumach Gold claim. In 2015, NEK Canada Mining Group completed a program of rock sampling and geological mapping on the area.

EMPR ASS RPT 9437, *17194, 20779, *26789, *31070, *36023
EMPR FIELDWORK 1980, pp. 165-178; 1986, pp. 43-45; *1987, pp. 295-300
EMPR IR 1986-1, p. 112
EMPR OF 1999-2
EMPR PF (Burge, C. (1984): Notes and Plan map of drift; Maggie Mines
Ltd. (May 19, 1978): Prospectus; Regional Geologist's notes, 1989)
GSC MAP 42-1963; 1386A
GSC MEM 158; 335
GSC OF 611
GSC P 53-28; 86-1B, pp. 685-692; 89-1E, pp. 177-187; 90-1E, pp. 183-
195; 90-1F, pp. 95-107
GSC SUM RPT 1917, Part B, pp. 23B-25B
GCNL #222, 1978; #153, 1979; #34,#87,#17, 1981; #195,#165,#177, 1982;
#137,#149,#211,#215, 1983; #91,#116,#108,#26,#179, 1984; #148,
#26,#183,#226, 1987; #230, 1988; #167,#148, 1989
IPDM Nov/Dec 1982; Jan/Feb, Aug/Sept, 1983; March/April, May/June,
N MINER Aug.25, Nov.10, 1983; July 11, 1988
Ditson, G.M. (1978): Metallogeny of the Vancouver-Hope Area,
British Columbia, M.Sc. Thesis, University of British Columbia
McKoll, K.M. (1987): Geology of the Britannia Ridge, East Section,
Southwest British Columbia, Unpub. M.Sc. Thesis, University of
British Columbia
Houle, J. (2009-08-10): Summary Report On the Maggie Gold Property