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File Created: 03-Sep-1991 by William (Bill) Coombe (WC)
Last Edit:  11-May-2020 by Karl A. Flower (KAF)

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NMI 104A4 Cu2,Au5
BCGS Map 104A022
Status Prospect NTS Map 104A05W
Latitude 056º 16' 13'' UTM 09 (NAD 83)
Longitude 129º 46' 25'' Northing 6236430
Easting 452089
Commodities Gold, Copper Deposit Types L01 : Subvolcanic Cu-Ag-Au (As-Sb)
G06 : Noranda/Kuroko massive sulphide Cu-Pb-Zn
H04 : Epithermal Au-Ag-Cu: high sulphidation
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The Todd Creek (North zone) is located on Fall Creek, a tributary of Todd Creek, about 15 kilometres south of the confluence of Todd Creek with the Bowser River, about 35 kilometres northeast of Stewart.

The area is underlain by Hazelton Group rocks of the Lower Jurassic Unuk River Formation (Bulletin 63). Green andesite flows, agglomerates, tuffs and purple, green to buff fragmental flows and flow breccias are intruded by narrow, coeval(?) fine grained mafic dikes. The andesite and andesite-dacite units commonly exhibit propylitic alteration comprising variable chlorite, carbonate, sericite and 2 to 5 per cent disseminated pyrite. The contact between the andesite and andesite-dacite units trend north-northwest and dips vertically. A feldspar porphyry intrusion is exposed about 600 metres east of the prospect. East-trending shearing is locally conspicuous, and jointing is well developed in the andesites.

The North zone mineralization comprises several north-northwest to northwest trending, vertical to steeply southwest dipping, quartz and breccia veins. The veins, 0.1 to 2 metres wide, contain quartz, calcite, chalcopyrite, pyrite, and hematite. The veins have been divided into two zones: A and B zones.

The western A zone is formed by two parallel veins separated by a quartz-chalcopyrite-hematite stringer zone. The veins, commonly banded and brecciated, have sulphides distributed throughout. The A zone has been traced for 320 metres on the surface. At the A zone, surface chip samples have assayed up to 5.25 grams per tonne gold and 0.18 per cent copper across 3 metres (Assessment Report 15988). Drilling tested the A zone over a length of 150 metres and indicated that the zone is discontinuous downdip and along strike. Values were generally low and over narrow widths, except in drillholes 88-22 and 88-41. Samples from drillhole 88-22 assayed 3.47 grams per tonne gold and 0.75 per cent copper across 31.85 metres (including 14.47 grams per tonne gold and 2.06 per cent copper across 5.95 metres) (Assessment Report 18800). Samples from drillhole 88-41 assayed 6.21 grams per tonne gold and 0.60 per cent copper across 1.75 metres (Assessment Report 18800). Holes drilled downdip and immediately along strike of hole 88-22 failed to intersect significant mineralization.

The B zone, 200 to 550 metres east of the A zone, consists of several north-northwest trending veins. These veins are identical in character to those in the A zone except for the absence of the stringer zone. One of the veins in the B zone has been traced for 170 metres. Chip samples from the B zone assayed up to 9.53 grams per tonne gold and 0.35 per cent copper across 1.0 metre (Assessment Report 18800).

In 1959, the prospect was discovered by prospectors O. Olsen and F. Hasselberg Jr. on behalf of Newmont Mining Corporation. In 1960, Newmont conducted a limited trenching and drilling program (3 holes?). Samples from trenching assayed up to 3.8 grams per tonne gold across 14.3 metres (Property File - Goldnev Resources, 1989). No further work was reported until 1981 when Woodcock, working for Riocanex Incorporated, sampled the trenches. In 1987, Brucejack Gold Ltd. sampled the old trenches. In 1986, Noranda Exploration Company Limited staked the Toc 1-12 claims to cover showings in the Todd Creek area. That year, Noranda resampled the Newmont A and B zones and carried out mapping, reconnaissance prospecting and silt sampling in the area. In 1987, Noranda conducted further sampling in the trenches and extended the mineralized veins farther to the south. In 1988, a grid was established, and detailed mapping was carried out. That year, Noranda drilled 11 holes (NTC-88-20 to 25 and 40 to 44) on the North zone (A zone only) and conducted a Mise-a-la-Masse survey. In 1997, Island-Arc Resources Corp. optioned the property.

In 2006, sampling of a historic trench (647 zone) assayed 117.17 grams per tonne gold and 5.65 per cent copper over 2 metres, while a drill hole (NAZ06-01) drilled on the North A zone multiphase breccia system yielded 0.42 gram per tonne gold and 0.17 per cent copper over 8.05 metres, including 1.04 grams per tonne gold and 0.23 per cent copper over 2.5 metres (Fedikow, M. (2010-04-12): NI 43-101 Technical Report: Geology, Mineralization and Exploration of the Todd Creek Property - An Update).

In 2017, stream sediment samples were collected by Millrock Resources Inc from streams in the vicinity of MINFILE occurrence Todd Creek (North Zone) (104A 106). This occurrence is located on Fall Creek about 700 metres upstream from its mouth in Todd Creek. Stream sediment sample W366506 was collected from Fall Creek about 200 metres upstream from Todd Creek. No significant anomalous values were obtained (Assessment Report 37268, Map 2a(1)).

Refer to Todd Creek-South zone (104A 001) for a detailed work history of the Todd Creek property area showings.

EMPR AR *1960-7
EMPR EXPL 1987-A15; 1988-A15, A32; 1990-35
EMPR OF 1987-22; 1994-14
EMPR MER 1990-36
EMPR PF (In 082M 141 - Goldnev Resources Inc., SMF No. 34/89, July 1989; Island-Arc News Release Feb.4, 1997)
GSC MAP 9-1957; 1418A
GSC OF 2582; 2779
GCNL #150(Aug.6), 1997; #78(Apr.23), 1999
PR REL Millrock Resources Inc., Aug.9, 2018
*Fedikow, M. (2010-04-12): NI 43-101 Technical Report: Geology, Mineralization and Exploration of the Todd Creek Property - An Update