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File Created: 29-Nov-93 by Robert (Bob) A. Lane(RAL)
Last Edit:  09-Mar-95 by Robert (Bob) A. Lane(RAL)

Summary Help Help

NMI
Name FAWN 5 Mining Division Cariboo
BCGS Map 093F024
Status Showing NTS Map 093F03E
Latitude 53º 12' 37" N UTM 10 (NAD 83)
Longitude 125º 12' 10" W Northing 5897928
Easting 352900
Commodities Iron, Copper, Gold Deposit Types K03 : Fe skarn
K01 : Cu skarn
K04 : Au skarn
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

Magnetite skarn mineralization occurs in Middle Jurassic Hazelton Group andesitic pyroclastic rocks on the Fawn 5 claim block at an elevation of approximately 1525 metres. Several outcrops of massive magnetite define an arcuate, generally southeast-trending band of magnetite-rich skarn that appears to be relatively flat lying.

Massive to semimassive magnetite, with traces of chalcopyrite, is exposed over a width of at least 20 metres and the zone may reach 300 metres in apparent width. Calcsilicate mineralogy includes garnet, pyroxene, epidote and actinolite. Up-slope and to the south, epidote-chlorite alteration (plus/minus magnetite, garnet and pyroxene) of the host pyroclastics is moderate to intense and widespread. Locally, epidote-rich bands have developed along a trend of 070 degrees, dipping 75 degrees north. These bands mimic bedding and are probably replacements of tuffaceous layers.

Approximately 5 kilometres west of the claim boundary the westerly extension of the Van-Tine Forest Service road has exposed limy tuffaceous, fossil-bearing sedimentary and intermediate pryoclastic breccias and lapilli tuffs of the Hazelton Group. Locally well-developed zones of garnet-pyroxene-epidote infiltration skarn are flanked by dark brown to black biotite hornfels that is all but completely devoid of its original texture. Weak to moderate hornfelsing is widespread.

Sulphide mineralization is sparse and averages less than 0.5 per cent of the rock by volume. Pyrite, pyrrhotite, arsenopyrite and traces of chalcopyrite occur as fracture fillings and as disseminations in biotite hornfels and skarn. Locally, remnant lapilli have been partly replaced by pyrrhotite. These new outcrops extend the known thermal effect of the Capoose batholith a minimum of 5 kilometres farther to the west of the magnetite skarn showing on the Fawn 5 claim.

Bibliography
EM FIELDWORK 1999, pp. 173-184
EMPR ASS RPT 12668, 13530
EMPR EXPL 1992-69-106
EMPR FIELDWORK 1993, p. 9-14, 15-26, 27-44, 45-55
EMPR OF 1994-9; 1994-10; 1994-18; 1994-19
GSC MEM 324
GSC P 90-1F, pp. 115-120

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