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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  19-Jun-2012 by George Owsiacki (GO)

Summary Help Help

NMI
Name MOUNTAIN VIEW, FISH CREEK NO. 2 VEIN Mining Division Alaska, USA
BCGS Map 103O100
Status Past Producer NTS Map 103O16E
Latitude 055º 59' 28'' UTM 09 (NAD 83)
Longitude 130º 03' 00'' Northing 6205588
Easting 434500
Commodities Silver, Gold, Tungsten, Lead, Copper, Zinc, Molybdenum Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
I12 : W veins
Tectonic Belt Coast Crystalline Terrane Plutonic Rocks, Stikine
Capsule Geology

The Mountain View occurrence is located on the ridge between Fish and Skookum creeks, 500 metres north-northeast of Mountain View, 6.8 kilometres north-northwest of Stewart.

The area is underlain by Early Jurassic Texas Creek Plutonic Suite granodiorite in contact with Lower Jurassic Hazelton Group argillite, tuffaceous greywacke and greywacke. Quartz veins occur in a shear zone up to 30 metres wide in the granodiorite within a hundred metres west of the contact with the Hazelton Group. Some veins occur in hornfelsed Hazelton Group greywacke and tuffaceous greywacke at the contact with granodiorite. Granodiorite porphyry dikes correlative to the Eocene Hyder pluton and lamprophyre dikes crosscut some quartz veins. Locally, a mineralized quartz vein cuts a white aplite dike.

The quartz veins strike from 280 to 007 degrees and dip between 40 to 70 degrees northeast. The veins branch and split locally up to 3 metres apart in the footwall and hangingwall. Fragments of granodiorite and schistose Hazelton Group wallrock occur in some veins. Vein widths vary from 7 centimetres to 2.43 metres and contain disseminated sulphides and seams and pockets up to 60 centimetres wide. Mineralization consists of pyrite, pyrrhotite, scheelite, chalcopyrite, galena, sphalerite, tetrahedrite, freibergite and local trace arsenopyrite and native gold. Gangue mineralogy is mainly quartz with minor interbanded barite. Rare molybdenite flakes occur in a granodiorite porphyry dike and aplite dike. The Fish Creek No. 2 vein is the only vein that contains scheelite.

A weighted average WO3 content of 43 channel samples taken underground from scheelite-bearing portions of the Fish Creek No. 2 vein assayed 1.23 per cent across an average vein width of 42 centimetres and along a strike length of 39 metres. This ore also averaged 3.42 grams per tonne gold and 219.39 grams per tonne silver (United States Geological Survey Bulletin 1024-F).

Past production statistics are not available. Underground work at the Mountain View mine is on three principal veins of which the Fish Creek No. 2 vein received the most development. Several other quartz veins and stringers are found on the property.

Bibliography
EMPR BULL 58; 63
EMPR FIELDWORK 1983, pp. 149-165; 1984, pp. 316-342; 1985, pp. 217-219; 1990, pp. 235-243; 2005, pp. 1-4
EMPR MAP 8
EMPR OF 1986-2; 1987-22; 1991-17; 1994-14
GSC MAP 1385A
GSC MEM 175
GSC OF 864; 2996
USGS BULL *807, pp. 63-67; *1024-F, pp. 137,138
EMPR PFD 18178, 18186, 881541

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