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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  24-Jul-2018 by George Owsiacki (GO)

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NMI 093F15 Mo1
BCGS Map 093F096
Status Developed Prospect NTS Map 093F15W
Latitude 053º 59' 02'' UTM 10 (NAD 83)
Longitude 124º 51' 47'' Northing 5983336
Easting 377837
Commodities Molybdenum, Uranium Deposit Types L05 : Porphyry Mo (Low F- type)
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The Nithi Mountain occurrence is located on Nithi Mountain approximately 10 kilometres south of the village of Fraser Lake and Highway 16. This village is about 158 kilometres by road west of the city of Prince George.

The region in which the Nithi Mountain showing occurs is within the Intermontane Belt, underlain dominantly by Lower to Middle Jurassic volcanic and sedimentary rocks of the Hazelton Group. These assemblages are overlain by the Upper Cretaceous to Lower Tertiary Ootsa Lake Group and Miocene plateau basalt. Intruding Lower Jurassic rocks of the Hazelton Group in the northeastern part of the map sheet is a belt of granodiorite, diorite and quartz diorite plutons of the Lower Jurassic Topley Intrusive Suite. Felsic plutons, probably Cretaceous, intrude both Lower and Middle Jurassic Hazelton strata.

The Topley Intrusive Suite ranges in composition from diorite to alaskite but consists mainly of quartz monzonite and diorite. In the area of the showings, two main intrusive phases have been recognized: the Nithi quartz monzonite and the Casey quartz monzonite to alaskite.

Mineralization consists of molybdenite in quartz veins up to 1 metre wide in Nithi quartz monzonite. Also in the area is a north striking, west dipping rhyolite porphyry dike which hosts secondary uranium minerals of autunite, torbernite and sabugalite along its western margin. This uraniferous zone is about 70 metres long. A sample of the porphyry dike assayed 0.14 per cent uranium (Minister of Mines Annual Report 1955, page 28). Molybdenite mineralization occurs in quartz monzonite along the eastern side of the dike in a 065 degree striking fracture but the relationship of this molybdenite occurrence to the adjacent uranium mineralization is not known.

Wallrock alteration associated with molybdenite mineralization comprises intense argillic alteration and minor amounts of weak potassic alteration.

The Nithi Mountain property was explored for molybdenum during a period between 1965 and 1981 by several companies. In 2004, Leeward Capital Corp. acquired the property and since then has created a comprehensive compilation and interpretation of all existing data within a GIS database and conducted airborne magnetic and resistivity surveys, airborne gradiometer and radiometric surveys, a LIDAR survey, additional soil geochemical sampling and drill programs in 2005, 2006 and 2008.

In 2008, Leeward Capital Corp. released resource estimates for the Gamma and Delta zones using a 0.020 per cent molybdenum cut-off (Stockwatch News Release September 24, 2008):


Zone Category Amount (tonnes) Molybdenum (per cent)

Gamma and Delta Inferred 165,250,000 0.026

Gamma Indicated 55,550,000 0.029


In 2011, Leeward Capital Corp. completed a 32-hole diamond drill program, totalling 6435 metres. Highlights of this program include drillhole D-11-54, which yielded 62.79 metres grading 0.119 per cent molybdenum, and drillhole D-11-56, which yielded 102.77 metres grading 0.057 per cent molybdenum (Assessment Report 32731).

EMPR EXPL 1975-E132; 1976-E142; 1978-E202; 1980-323; 1982-292; 1992-69-106
EMPR GEM 1973-327
EMPR AR *1955-28; *1956-28; 1963-36; 1964-62; 1965-138,Figure 24; 1966-118
EMPR FIELDWORK 1992, pp. 475-481; 1993, pp. 9-14; 1994, pp. 167-170, 193-197
EMPR MAP 22, #48
EMPR PF (Claim Map, 1955; Mineral Claim locations Nithi Mountain Molybdenum area, 1963; Air Photo Nithi Mountain area, 1964; Roberts, A.F. (1971): Report on Nithi Mountain Property; Nithex Exploration and Development Ltd. Prospectus March 1971; Topography Map Nithi Mountain Property, 1975; Tully, D.W. (1978): Letter regarding Nithi Mountain Claims; Sketch of claim posts, geology and pits, date unknown)
GSC P 90-1F, pp. 115-120
GSC EC GEOL 16 (Rev.), p. 229
GSC OF 551
GSC MAP 1131A; 1424A
V STOCKWATCH Sept.24, 2008
PR REL Leeward Capital Corp., Feb.24, Nov.3, Dec.20, 2004; Mar.23, Apr.5,12, May 4,24, 2005; Jan.10, Jun.15,27, Jul.25, 2006; Jun.22, Jul.19, Sept.*6, 2011
Bell, P.T. (1985): Overview of Uranium in Volcanic Rocks of the Canadian Cordillera; 1AEA Vol. ST1/PUB/690, Uranium in Volcanic Rocks, p. 329