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File Created: 13-Jul-1988 by Garry J. Payie (GJP)
Last Edit:  21-Apr-2020 by Karl A. Flower (KAF)

Summary Help Help

NMI
Name TIDE NORTHPIT, TIDE NORTH, NORTHPIT, RIP TIDE, HOITO Mining Division Skeena
BCGS Map 104B030
Status Prospect NTS Map 104B08E
Latitude 056º 16' 15'' UTM 09 (NAD 83)
Longitude 130º 05' 18'' Northing 6236745
Easting 432605
Commodities Gold, Silver, Zinc, Lead, Copper Deposit Types I02 : Intrusion-related Au pyrrhotite veins
I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The Tide Northpit occurrence is located at an elevation of approximately 1360 metres on an east facing slope and approximately 1.7 kilometres west of the Bowser River.

The area is composed of ash tuffs with lesser dust and lapilli tuffs and interbedded augite porphyry of the Lower Jurassic Unuk River Formation, Hazelton Group. A north trending extension of Lower Jurassic Summit Lake Stock hornblende granodiorite intrudes the volcanics. This intrusive lobe is from 300 to 500 metres wide and separates andesitic volcanics to the west from dacitic volcanics to the east (Open File 1987-22).

The Northpit occurrence, located approximately 600 metres west of the intrusive, consists of two or three westerly-trending fracture zones in feldspar-pyroxene porphyritic andesite and andesitic block and ash tuff. The fracture zones dip steeply, range up to 3 metres wide and host 1 to 20-centimetre wide quartz-pyrite-arsenopyrite veins. Numerous left-lateral cross-faults displace these zones by a few metres, chopping them into segments a few metres long. The stretches up to 550 metre with a width of 65 metres. The veins may host small pods of massive arsenopyrite up to 5 centimetres wide, as well as disseminated pyrite and arsenopyrite. One narrow vein was reported to contain minor amounts of sphalerite, galena, and trace chalcopyrite. Some calcite veining was observed, and some calcite also occurs with the quartz veins. Chloritic alteration is characteristic of the shear zones and some areas of weak silicification and pyritization also occur.

In 1983, samples contained up to 87.77 grams per tonne gold and 24.40 grams per tonne silver but were generally closer to the sample that contained 18.44 grams per tonne gold and 18.51 grams per tonne silver (Assessment Report 11528).

In 1990, hole 90-1 was drilled under some of the better Northpit veins, intersecting two quartz-arsenopyrite veins yielding 2.6 grams per tonne gold over 1.3-metres (Assessment Report 20771). Surface sampling, performed at this time, yielded up to 53 grams per tonne gold over 0.3 metre (Heffernan, R.S. (2006-11-15): Summary Report on the Tide Project).

In 1996, chip and channel sampling yielded up to 4.15 grams per tonne gold over 1.5 metre (Heffernan, R.S. (2006-11-15): Summary Report on the Tide Project).

In 2001, two samples (51086 and 51087) yielded 5.15 and 1.00 grams per tonne gold with 24.2 and 3.8 grams per tonne silver over 0.11 and 1.15 metres, respectively (Heffernan, R.S. (2006-11-15): Summary Report on the Tide Project).

In 2005, a select sample (279351) assayed 2.14 grams per tonne gold and 3.5 grams per tonne silver (Heffernan, R.S. (2006-11-15): Summary Report on the Tide Project).

In 2006, a channel sample (M270409) assayed 2.62 grams per tonne gold (Awmack, H., Major, J. (2008-03-11): 2008 Technical Report on the Tide Property).

In 2007, diamond drilling yielded intercepts of 0.250 gram per tonne gold over 208.12 metres in hole TIDE07-18 and 0.125 gram per tonne gold over 226.72 metres in hole TIDE07-20 (Awmack, H., Major, J. (2008-03-11): 2008 Technical Report on the Tide Property).

The Riptide zone is similar to and 150 metres north of the Northpit zone, consisting of a series of carbonate-altered shear zones and weakly chloritized, sericitized or silicified fracture zones which trend east-west and dip steeply to the north. This Riptide zone likely represents a mineralized area that is fault offset from the Northpit zone. Mineralogy is similar to the Northpit zone, consisting of pyrite-arsenopyrite without other base metal sulphides or quartz.

In 2001, a sample (51088) assayed 5.48 grams per tonne gold and 17.4 grams per tonne silver over 0.40 metre (Heffernan, R.S. (2006-11-15): Summary Report on the Tide Project).

In 2006, the best section from channel sampling graded 0.43 grams per tonne gold over 12.9 meters and containing 3.5 metres of 1.13 grams per tonne gold (Assessment Report 28869).

In 2007 a channel sample (M270425) assayed 1.45 grams per tonne gold, while a lone drill hole (TIDE07-19) yielded 0.086 gram per tonne gold over 241.59 metres including 0.27 gram per tonne gold over 11.10 metres (Awmack, H., Major, J. (2008-03-11): 2008 Technical Report on the Tide Property).

The Hoito zone is similar to and 200 metres west of the Riptide zone, consisting of a series of carbonate-altered shear zones and weakly chloritized, sericitized or silicified fracture zones which trend east-west and dip steeply to the north. The Hoito zone likely represents the up-dip continuation of the Riptide zone. Mineralogy is similar to the Riptide zone, consisting of pyrite-arsenopyrite without other base metal sulphides or quartz.

In 2007, a channel sample (C191998) assayed 0.50 gram per tonne gold over 3.00 metres (Awmack, H., Major, J. (2008-03-11): 2008 Technical Report on the Tide Property).

Refer to Tide (104B 129) for details of work done on the Tide property including the Northpit zone.

Bibliography
EMPR ASS RPT 8656, 9687, *11528, 13072, 15410, 15626, 17894, *20771;, 23642, 24190, 24815, *27590, 28012
EMPR BULL 63
EMPR EXPL 1980-45; 1981-90; 1983-521; 1984-385; 1987-C375
EMPR FIELDWORK 1983, pp. 149-164; 1984, pp. 316-341; 1985, pp. 217-
224; 1986, pp. 81-102
EMPR OF 1987-22
GSC MAP 9-1957; 307A; 315A; 1418A
GSC MEM 175
GSC P 89-1E, pp. 145-154
GCNL #79, 1982; #70,#122, 1984
N MINER March 4, 1982; April 12, 1984
Equity Preservation Corp. Compilation: Stewart-Sulphurets-Iskut,
Dec. 1988, (Showing No. B82)
*Heffernan, R.S. (2006-11-15): Summary Report on the Tide Project
*Awmack, H., Major, J. (2008-03-11): 2008 Technical Report on the Tide Property
EMPR PFD 19440, 904933

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