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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  12-Aug-2014 by Garry J. Payie (GJP)

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NMI 104G9 Au2, Cu3
BCGS Map 104G068
Status Developed Prospect NTS Map 104G09W
Latitude 057º 41' 12'' UTM 09 (NAD 83)
Longitude 130º 29' 16'' Northing 6394800
Easting 411296
Commodities Gold, Silver, Copper, Lead, Zinc Deposit Types L04 : Porphyry Cu +/- Mo +/- Au
I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Intermontane Terrane Stikine, Plutonic Rocks
Capsule Geology

The Spectrum-Red Dog property is located just southeast of Edziza Peak and 4 kilometres southwest of Nuttlude Lake. The property was originally staked as the Spectrum claims by Spartan Exploration Ltd. in 1969 in order to cover a copper occurrence there. Mitsui Mining and Smelting operated the property in 1970 followed by Imperial Oil Enterprises in the next 3 years. This work included geochemical and geophysical surveys culminating in 1973 in 4 diamond drillholes totalling 450 metres. The property was restaked as the Red Dog claims in 1975 and optioned to Consolidated Silver Ridge Mines Ltd. by owner Placer Development Ltd. This optionee worked the property by conducting more geochemical surveys in 1978 and trenching and 10 diamond drill holes totalling 828 metres in 1979. In 1980, Consolidated Silver, now the owner, drilled a further 18 holes totalling 2336 metres. Northcal Resources Ltd. (formerly Consolidated Silver Ridge) conducted an unspecified amount of work in 1981 and 1982, including more trenching (see the related GR occurrence - 104G 122). Cominco Ltd. optioned the property from Northcal and also Newhawk's Hawk claims to the north of the Red Dog claims, conducting a soil geochemistry program in 1984. The option lapsed the following year. Cominco returned in 1989 and drilled a further 10 diamond drill holes. In 1990 and 1991, Columbia Gold Mines, holding both the Red Dog and Hawk claims, drilled 3142 metres in 26 holes and excavated 631 metres of trenches.

In early 2005, a report on resource, geology and petrography was submitted for assessment on the Spectrum property for operator Trans Pacific Mining Ltd and owner Seeker Resources Corp. The results of the resource model are summarized in a report by Mining Associates of Australia dated May 12,2004 which is attached to Assessment Report 27688. The report puts the Spectrum Project resources into JORC format and based on a cut-off grade of 5 grams per tonne gold, a resource of 474,615 tonnes at 11.4 grams per tonne gold is estimated for a total contained metal content of 173,555 ounces of gold. By reducing the cut-off grade to 2 grams per tonne a contained metal content of 255,659 ounces of gold at 6.05 grams per tonne gold is derived.

In 2005, a visit was made to the Spectrum property in order to assess the possibility of mobilizing a small diamond drill rig. Three water samples and some minor geological work was done. Seeker Resources Corp is indicated as owner and Cambria Ice Field Resources Inc as operator.

See Hawk - 104G 005 for further information.

The region of the Spectrum prospect is largely underlain by Late Tertiary and younger flows of the Mount Edziza eruptions. These rocks range from basaltic to rhyolitic in composition.

A thick sequence of Upper Triassic sedimentary and volcanic rock underlie the younger volcanics. A 900-metre thick package of agglomerate, greywacke, grit and chert breccia interbedded with tuffaceous siltstones is overlain by 1200 metres of green, purple and grey andesite and derived volcaniclastics. The volcanics are cut by andesite dikes and sills and irregular subvolcanic intrusive bodies. Small diorite and granodiorite intrusives of Jurassic to Cretaceous age cut all of the Triassic rocks. The Upper Triassic rocks are warped into open folds with east-west axes. These are cut into blocks by north, east, northwest and northeast striking faults.

Four types of mineralization occur in the Spectrum-Red Dog area: 1) Pyrite with minor pyrrhotite occurs as disseminations and fracture-fillings in Upper Triassic cherts, tuffs and flows. This mineralization is largely syngenetic with the volcanic assemblage. Estimates of pyrite content range from 2 to 10 per cent. 2) Pyrite, arsenopyrite, sphalerite and galena occur in narrow quartz-carbonate veins within the Upper Triassic sediments and volcanics. These veins range from less than one 1 centimetre to 30 centimetres in width and contain high gold and silver values, particularly where arsenopyrite and/or sphalerite occur. A one metre sample across a number of veinlets assayed 1.2 per cent zinc, 4.11 grams per tonne gold and 10.97 grams per tonne silver. 3) Pyrite, pyrrhotite, chalcopyrite and magnetite occur in irregular, metasomatic replacement masses in limy sediments. This showing is located a few hundred metres south of the main occurrence. A grab sample of syenite and skarn contained 0.5 per cent copper, 4.94 grams per tonne gold and 0.68 grams per tonne silver. 4) Pyrite and chalcopyrite occur as disseminations and fracture-fillings in a north-northeast striking granodiorite dike later called a monzonite dike) and adjacent wallrock that consists of Upper Triassic sediments and volcanics. The dike varies from 50 to 100 metres in width and has been traced along strike for 1200 metres. It dips from 60 to 80 degrees to the west. This porphyry-type mineralization is associated with sericite and secondary biotite alteration. A 15-metre section of drill core assayed 0.30 per cent copper. Samples of cherty tuff and pyroclastic wallrocks assayed up to 2.5 grams per tonne gold while the dike rocks assayed up to 0.60 grams per tonne gold.

Drilling has defined an ore zone along and in the granodiorite dike with about 50 per cent of the mineralization in the granodiorite and 50 per cent in siliceous volcanic and pyroclastic rock. The zone is 250 metres long by 45 metres wide. The zone is open to the north and south and at depth.

Columbia Gold Mines described several new zones after their 1991 work (Assessment Report 20860). The East QC, West QC and Porphyry Gold Zones contain visible gold, pyrite, arsenopyrite and minor base metals within potassic to propylitic altered andesitic tuffs. Several other zones of mineralization indicated on company maps include the Fog, Skarn, 500 Colour and Boundary zones and the 4400 vein.

The 500 Colour zone consists of a stockwork of quartz veins and veinlets which contain sphalerite, galena and chalcopyrite. Fine arsenopryite was found in thin seams adjacent to veins in one drill hole. The mineralization is spatially related to the margins of the westerly dipping monzonite (granodiorite?) dike. The East QC zone was outlined along a 550 metre length and to a depth of 90 metres. To 1991, the zone remained open along strike and to depth. The West QC zone trends northwesterly and dips steeply to the west having a strike length of 760 metres. The Porphyry zone was drilled along a 300 metres strike length to a depth of 60 metres. This zone is reported to be 30 metres west of the QC mineralization and is found within a broad zone of gold-copper mineralization.

Indicated reserves in 1983 at Red Dog were 2,177,040 tonnes grading 1.26 grams per tonne gold (Northair Mines Ltd. Annual Report 1983). In 1991, Columbia Gold Mines calculated a "drill indicated geological reserve" within the tested portion of the Porphyry, QC and 500 Colour Zones of 614,700 tonnes grading 12.3 grams per tonne gold using 5 grams per tonne gold as a cut-off (Assessment Report 22838). In the same year, Orcan Mineral Associates calculated "drill indicated reserves". One reserve was based on a 10 grams per tonne gold cut-off of 274,900 tonnes at an average grade of 15.77 grams per tonne gold and the second based on 5 grams per tonne gold cut-off of 504,800 tonnes grading 9.6 gram per tonne gold (Assessment Report 22838, page 8).

EMPR ASS RPT *2735, 3501, 3866, *7000, *7586, *8853, *10117, 13243, 19364, *20861, *22838, *27688, 28308
EMPR EXPL *1978-E258; 1979-283; 1980-474; 1981-208; 1984-390
EMPR FIELDWORK 1976, pp. 71-73; 1994, pp. 343-358; 1995, pp. 155-174; 1996, 283-290,291-297
EMPR GEM 1970-57; 1971-41; *1972-531; 1973-506
EMPR MAP 65 (1989)
EMPR OF 1992-1; 1992-3; 1996-4; 1997-3
EMPR PF (Clippings)
EMR MIN BULL MR 223 B.C. 333
EMR MP CORPFILE (Spartan Exploration Ltd.; Consolidated Silver Ridge; Northair Mines Ltd.)
GSC MAP 9-1957; 11-1971; 1418A
GSC P 71-44
CIM Spec. Vol. 37, pp. 178-190
Chevron File
Falconbridge File
GCNL #233(Dec.1), 1983; #24(Feb.3),#122(Jun.25), 1984; #119(June 21), #164(Aug.25),#201(Oct.19), 1989; #81(Apr.26),#181(Sept.19), #184(Sept.24),#204(Oct.22),#219(Nov.13), 1990; #15(Jan.22), #48(Mar.8),#88(May 7),#117(June18),#130(Jul.8),#137(Jul.17), #138(Jul.18),#140(Jul.22),#146(Jul.30),#147(Jul.31),#149(Aug.2), #156(Aug.14),#172(Sept.6),#211(Nov.1), 1991; #60(Mar.25),#66 (Apr.2),#110(June 8),#130(July 7),#153(Aug.10),#174(Sept.9), 1992
N MINER Sept.4, 1989; Oct.29, 1990; May 20, July 15,22,29, Aug.5,12, 19, 1991; Mar.30, Apr.13, June 15, Aug.17, Sept.14, 1992