| Capsule Geology |
The Fred occurrence is located approximately 5 kilometres due north of Kaza Peak (Property File - Kikuchi, T., 1969). There is some confusion between this deposit and the Kaza Copper deposit (093M 111) to the south.
The occurrence is hosted in Upper Triassic Dewar Formation (Takla Group) tuffs and sediments. The Dewar Formation is overlain by the Savage Mountain Formation (Takla Group) volcanics. These rocks strike northwest and dip approximately 20 degrees to the northeast (Geological Survey of Canada Open File 342). The rocks are intruded, to the southwest, by quartz monzonite related to the Early Jurassic Hogem Batholith, which lies about 10 kilometres to the east. The major faults in the area trend north to northwest with smaller crossfaults trending west-southwest.
The Fred occurrence comprises five mineral showings, which are; the Main showing (also known as the RMT and A), the North showing (also known as the DB), the CV and the CVH (these showings are sometimes referred to as the B) and the BC showing.
The Main showing consists of very fine-grained disseminated bornite, chalcocite and chalcopyrite (identified by polished sections, Assessment Report 833) in interbedded laminated siltstones, lapilli tuffs and coarse tuffs. Malachite staining is present in small shears within sheared tuffs. Native copper occurs, less than 250 metres to the east, in andesite porphyry. A sample from this area assayed 2.65 per cent copper, 6.86 grams per tonne silver and 0.2 gram per tonne gold (Property File - Kikuchi, T., 1969).
The North showing, approximately 500 metres to the west of the Main showing, is hosted in malachite-stained, black shaly siltstones. Minor chalcocite is visible and a grab sample from this area assayed 1.57 per cent copper and 13.7 grams per tonne silver (Assessment Report 833).
The BC showing is found approximately 500 metres to the southeast of the Main showing. The vein, 7 to 15 centimetres wide, is hosted in andesite porphyry and contains chalcocite and bornite. A channel sample, across the widest point of the vein, assayed 50.9 per cent copper, 603.4 grams per tonne silver and 0.3 grams per tonne gold (Property File - Letter from the President, Northstar Copper, 1967).
The CVH showing is located approximately 600 metres south-southeast of the Main showing. This showing consists of a contact zone between andesite porphyry and brecciated, highly vesicular rock. This zone contains bornite, chalcocite and specular hematite. A 7.3-metre chip sample, taken from a trench, assayed 2.60 per cent copper, 5.14 grams per tonne silver and 0.2 gram per tonne gold (Property File - Kikuchi, T., 1969).
The CV showing is located approximately 45 metres west of the CVH trench. This showing is hosted in a shear zone, which cuts the contact between the andesite porphyry and the brecciated, highly vesicular rock. The mineralization consists of bornite, covellite, chalcocite and specular hematite. A 3.66-metre channel sample assayed 3.3 per cent copper and 10.3 grams per tonne silver (Property File - Kikuchi, T., 1969).
Everest Mines and Minerals Ltd. trenched the property in 1997. A 5.5-metre sample assayed 7.3 per cent copper and 46.6 grams per tonne silver (Exploration in BC 1997, page 28).
The showings comprising the Northstar project area were first discovered and staked as the FRED prospect by Mr. Robert Tait in 1965. Five showings were identified: the Main showing, the North showing, the CV and CVH showing (both also referred to as the B showing) and the BC showing.
Exploration in 1966 consisted of preliminary mapping, prospecting and geological mapping, followed by grid soil sampling and a 637-metre diamond drilling program of nine AQ-diameter holes targeting the Main and B showings.
In 1968, a further eleven AQ-diameter holes totaling 800 metres were drilled, as well as 9,144 metres of bulldozer trenching and blasting of 50 shallow pits. A further thirteen AQ-diameter holes totaling 1242 metres were drilled, largely across the B showing.
In 1972, Northstar Copper Mines Ltd. drilled nine AQ-diameter holes totaling 693 metres; however, locations and results are not known. At this time proven and probable ore reserves were 1,090,000 tonnes grading 2.0 per cent copper (Property File Cyprus Anvil Northstar Copper Mines Ltd., 1972).
In 1973, Bethlehem Copper Mines Ltd. optioned the property, conducted a geochemical survey across the eastern portion of the property, excavated two more bulldozer trenches, and drilled eight shallow AQ diamond drill holes totaling 290 metres.
In 1974 Northstar Copper Mines Ltd. conducted limited bulldozer trenching and a 10- hole, 398-foot (121.5 metre) "Winkie" drilling program targeting extension of the shale unit hosting the "RMT" showing, interpreted as occurring north of the B-showing. No significant intercepts were reported.
The property lay dormant until 1996, when Everest Mines and Minerals Ltd optioned both the Kaza and Northstar properties. A bulldozer trench at the B-showing exposed a system of parallel chalcocite veins and mineralized shear zones within porphyritic andesite. A second showing, the "B-Zone 2", discovered 100 metres to the north, is comprised of three narrow north-south striking, west-dipping chalcocite-bornite veins.
In 1997, Everest Mines and Minerals Ltd established a cut grid of eleven 990-metre lines. Everest conducted a detailed soil geochemical program at 15-metre station intervals across the southern ten lines. Everest also excavated three new trenches and a blast trench: the "Discovery Cut", hosting the "New Vein", located south of the B-showing; Trench TN-1 located about 40 metres to the north of the Discovery Cut; and the blast trench and trench TN-2, about 180 metres to the northeast, all within porphyritic andesite. Also in 1997, Everest contracted Geotronics Surveys Ltd. to conduct ground magnetic, induced polarization (IP) chargeability and resistivity surveys covering the same grid lines as the geochemical survey.
In March 2002, Northern Hemisphere Development Corporation entered into an option agreement to acquire a 100 per cent interest in both the Kaza (093M 111) and Northstar properties. Northern Hemisphere then staked the TLA 1–8 claims, covering territory between the two claim blocks, effectively creating one contiguous land holding, as well as additional ground to the north and south of the respective project areas. The Northstar and Kaza properties are now referred to as the Northstar project and Kaza project areas.
In 2003, Northern Hemisphere conducted line cutting to extend existing grids on both the Northstar and Kaza project areas. This was followed by soil geochemical sampling, geological mapping, rock and silt sampling covering the grid extensions of both project areas. Detailed geological mapping and rock sampling were also conducted over the 1997 grids at both project areas, and directly northwest of the previously gridded portion of the Northstar project area. Ground magnetometer and induced polarization surveys were conducted over the entire newly cut grids at the Kaza project area; Chargeability and resistivity IP surveying was also done across much of the grid extension of the Northstar project area. A two-line gravity survey was conducted across the central portion of the Northstar project area.
In 2004, Northern Hemisphere drilled 1,133.2 metres in five NQ diamond-drill holes on its Northstar (Fred) property. Drilling on the Northstar property intersected disseminated and fracture-controlled bornite and chalcocite in feldspar-phyric flows, tuffs and related sediments of the Takla Group. Hole NS-04-02 intersected 138.3 metres grading 0.55 per cent copper (Exploration and Mining in BC 2004, page 40).
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