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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  09-Jul-2009 by Sarah Meredith-Jones (SMJ)

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NMI 093F15 Mo6
Name TAN, NORTH SHOWING Mining Division Omineca
BCGS Map 093F096
Status Showing NTS Map 093F15W
Latitude 053º 59' 45'' UTM 10 (NAD 83)
Longitude 124º 49' 56'' Northing 5984612
Easting 379893
Commodities Molybdenum Deposit Types L05 : Porphyry Mo (Low F- type)
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The region in which the Tan 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 of probable Cretaceous age 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.

The showing is within well-jointed Nithi quartz monzonite, which is partially surrounded by Casey quartz monzonite to alaskite. Molybdenite mineralization occurs in quartz veinlets and veins that commonly trend 065 to 070 degrees. Argillic alteration of the hostrock is moderate to intense while minor potassic alteration occurs adjacent to some of the veins.

In 1969, the northeast and southern slopes of Nithi Mountain were being prospected staked by Nithex Exploration and Development Limited. A geochemical survey was completed in 1970 and outlined and an anomalous area, 1200 by 1600 metres. Grab samples from this area returned values ranging from 0.09 to 0.98 per cent MoS2 (Property File Cyprus Anvil Nithex Exploration and Development Corp., 1971).

EMPR AR 1964-64; 1965-133(fig. 24); 1966-118
EMPR ASS RPT 2841, 2842, 2843, 3546, 5489, 8399, 8470, 9110, 9368, *10314
EMPR EXPL 1975-E132; 1976-E142; 1978-E202; 1980-323; 1982-292; 1992-69-106
EMPR FIELDWORK 1992, pp. 475-481; 1993, pp. 9-14; 1994, pp. 167-170, 193-197
EMPR GEM 1970-112; 1972-348; 1973-327
EMPR PF (See 093F General File, Nithi Mountain Area Maps; See 093K General file, Endako Area Maps)
EMPR PF Cyprus Anvil (Nithex Exploration and Development Corp. (1966-01-01): Reconnaissance Geology Map - Nithi Mountain - 71-106; B.C. Government Air Photograph (1966-09-13): Air Photo - BC5217-212 - Fraser Lake; B.C. Government Air Photograph (1966-09-13): Air Photo - BC5217-213 - Fraser Lake; Lockwood Survey Corp. (1969-04-30): Air Photo - No. 3464 Buckley Valley - Nithi Mountain; Nithex Exploration Development Co. Ltd. (1966-09-01): Reconnaissance Geology Map - Nithi Mountain - 71-106; Nithex Exploration and Development Ltd. (1970-08-20): Claim Boundary Map - Showing Trenches, Roads and Outrcrops - Sandy, Pogo and Ruff Claims; Nithi Exploration and Development Ltd. (1970-08-20): Geochemical Contours Map - Nithi Mountain; Nithex Exploration and Development Ltd. (1971-01-01): Detailed Geology Map - Nithi Mountain Claims; Nithex Exploration and Development Corp. (1971-03-26): Prospectus Report on the Nithi Mountain Claims)
GSC MAP 1131A; 1424A
GSC P 90-1F, pp. 115-120