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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  21-Sep-1993 by George Owsiacki (GO)

Summary Help Help

NMI
Name ICE, CASS Mining Division Revelstoke
BCGS Map 082N002
Status Prospect NTS Map 082N04E
Latitude 051º 02' 05'' UTM 11 (NAD 83)
Longitude 117º 43' 19'' Northing 5653934
Easting 449380
Commodities Tungsten Deposit Types K05 : W skarn
Tectonic Belt Omineca Terrane Kootenay, Plutonic Rocks
Capsule Geology

The main showing is situated near the headwaters of Albert Creek, between Justice Glacier and Primrose Icefield, about 36 kilometres east of Revelstoke.

The Ice occurrence area is underlain by a highly siliceous and complexly interlayered sequence of Lower Cambrian and younger Lardeau Group metasediments consisting of quartzites, quartz biotite schists, quartz muscovite schists, biotite schists and minor thin lenses of impure siliceous marble. Early and/or mid-Cretaceous intrusive stocks are poorly exposed on the eastern and western extremities of the occurrence area. The western stock has an outer rim phase of coarse grained, felsic biotite quartz diorite but is dominantly composed of granodiorite. The eastern intrusion is a very coarse grained, felsic quartz diorite or biotite granodiorite.

Narrow limestone bands close to the western intrusive contact are locally converted to coarse grained epidote-garnet skarns with minor diopside. Weak hornfelsing is present close to both intrusive contacts and many irregular granitic dikes and sills are present within the metasedimentary sequence.

The metasediments have undergone intense deformation and show evidence of at least two periods of folding. The first, most intense period of folding produced the pronounced major north-south foliation evident throughout the property.

Mineralization occurs in the form of low-grade scheelite and minor wolframite on fracture planes primarily hosted in quartzite. The scheelite occurs as coarse platy masses up to 1.2 centimetres in diameter and is extremely friable and is relatively abundant on fractures striking north and dipping approximately 30 degrees west. Scheelite-bearing fractures, on average, are approximately 0.3 to 0.6 metres apart. Traces are disseminated through the hostrock which is a pale grey to yellowish coloured quartzite with minor biotite, interlayered with muscovite quartzites. Night lamping has outlined a scheelite-bearing zone in quartzite that is approximately 4.5 to 12.1 metres wide extending 426 metres in a north-south direction. Seven rock grab samples assayed from 0.03 to 0.64 per cent WO3 and averaged 0.2 per cent WO3 (Assessment Report 14749).

A few quartz-pyrite-muscovite veins mineralized with abundant, finely disseminated scheelite occur to the south of the main mineralized zone. The veins are 2.5 to 5 centimetres wide, strike east and are almost vertical. Several other small scheelite showings with minor disseminated sulphides, including pyrrhotite, are evident.

Bibliography
EMPR ASS RPT *3725, *14749
EMPR FIELDWORK 2000, pp. 231-252
EMPR GEM 1971-444, 1972-95
EMPR PF (82N General File - Canadian Superior Exploration geochemistry maps, 82N/4E,4W, 1976)
GSC MAP 4-1961; 43-1962
GSC OF 481
GSC P 62-32
GCNL #168(Sept.1), 1993

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