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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  04-Apr-2022 by Karl A. Flower (KAF)

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NMI 104K7 Mo2
Name LC 1, PETER, FOOL, TRAPPER Mining Division Atlin
BCGS Map 104K037
Status Prospect NTS Map 104K07E
Latitude 058º 20' 23'' UTM 08 (NAD 83)
Longitude 132º 42' 03'' Northing 6468833
Easting 634596
Commodities Molybdenum, Copper, Silver, Tungsten, Fluorite, Gold, Zinc, Lead Deposit Types L08 : Porphyry Mo (Climax-type)
L04 : Porphyry Cu +/- Mo +/- Au
I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Insular Terrane Stikine
Capsule Geology

The LC 1 area is underlain by two ages of intrusive; Middle to Late Triassic foliated diorite to quartz monzonite and Tertiary granite of the Sloko-Hyder Plutonic Suite. Feldspar +/- quartz porphyry dikes are also related to the Sloko-Hyder suite and cut the other intrusions. A few small areas of sheared and altered rocks, with chlorite, epidote and biotite, occur. Quartz veins, from 1 centimetre to 3 metres wide, carry molybdenite as coarse rosettes and disseminations. Associated minerals include pyrite, chalcopyrite, magnetite, fluorite and minor stibnite, scheelite and powellite. The mineralized veins occur mainly within the diorite, with an apparent relationship to the quartz feldspar porphyry. The main mineralized zone measures about 170 by 110 metres, with scattered mineralized veins occurring over a 1.0 by 1.5 kilometre area.

Mineralization on the property is of two main types. It is either hosted by quartz veins or as silicification with associated veining related to the quartz-feldspar porphyry dykes. Molybdenite mineralization is widespread whereas other mineralization, either base or precious metals, is uncommon and not of appreciable extent.

The most significant mineralization is the molybdenite-pyrite associated with quartz veining. Two distinct styles of veining were observed on the property. The most predominant is a system of 0.5-1.5 metres wide white quartz veins with laminae composed of fine grained molybdenite and a distinct yellow “moly-ochre" oxide. Pyrite is commonly associated with this type of veining, whereas chalcopyrite, sphalerite or galena is rare. Occasionally veins of this type are spatially related to the mafic or felsite diking.

Another style of quartz veining is consists of molybdenite rosettes in open spaces of otherwise bull white quartz veins. The veins range in width from 5-50 centimetres. No other mineralization is associated with this vein type. No common orientation was noted in the veining and they range from nearly flat lying to steeply dipping.

The second main type of mineralization on the property is a contact feature, related to the quartz-feldspar porphyry dykes. Rusty zones in the diorite, up to several metres in size, represent intense silicification and pyritization. Quartz veining may or may not be present. Mineralization of this type returned some anomalous lead and silver values with occasional copper anomalies; 1-2 per cent lead with 100-230 grams per tonne silver was returned from a small number of samples (Assessment Report 19285). Anomalous gold values are rare. Two samples from the property returned in the order of 6.0 grams per tonne gold, but follow-up work indicates they are a localized phenomenon (Assessment Report 19285).

Several samples within the main mineralized area assayed over 1.0 per cent molybdenum. One sample assayed 9.45 per cent molybdenum and a bulk sample assayed 0.051 per cent molybdenum (Assessment Report 2059). One kilometre southwest of the main mineralized zone, chip samples from 5 locations along a 50 metre length, across a 2 to 3 metre vein, assayed 0.116 per cent molybdenum, 0.01 per cent tungsten and 4.1 grams per tonne silver (Assessment Report 8030). A 3.0 metre sample of a sheared dyke, about 200 metres west of the main zone, assayed 6.9 per cent fluorite (Assessment Report 8030).

Work History

The property was explored in 1968-69 by Geophoto Services Ltd. who carried out geological mapping, prospecting and sampling. In 1979, Noranda Exploration Company Ltd, staked the same block of ground and conducted a small prospecting program. In 1981, they completed detailed geologic mapping of the area and concluded that the property hosts a widespread occurrence of molybdenite mineralization but not of significant size to warrant further surface work. In 1989, Cathedral Gold Corporation conducted a work program that included detailed prospecting and rock sampling with some reconnaissance level soil and silt sampling.

In 2020, Brixton Metals Corporation completed a program of geochemical (rock and soil) sampling, a 12.5 line-kilometre ground induced polarization survey, a 715 line-kilometre airborne magnetic and electromagnetic survey and 19 diamond drill holes, totalling 5292 metres, on the area of as part of the Thorn property. Drilling was performed on the Outlaw (MINFILE 104K 176) occurrence area.

EMPR ASS RPT *2059, *8030, *9410, *19285
EMPR GEM 1969-37
EMPR EXPL 1980-490
GSC MAP 6-1960; 1262A
EMPR PF (Reports by Lefebure, D. (1987))
EMPR OF 1991-17; 1992-16
Burrell, H., Deiss, A.M. (2021-06-23): Thorn Property NI 43-101 Technical Report Sutlahine River Area, British Columbia, Atlin Mining Division