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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  20-Apr-2021 by Nicole Barlow (NB)

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NMI
Name ENCO 3 FR. Mining Division Omineca
BCGS Map 093F096
Status Showing NTS Map 093F15W
Latitude 053º 58' 02'' UTM 10 (NAD 83)
Longitude 124º 51' 56'' Northing 5981486
Easting 377624
Commodities Molybdenum Deposit Types L05 : Porphyry Mo (Low F- type)
Tectonic Belt Intermontane Terrane Stikine, Cache Creek
Capsule Geology

The region in which the Enco showing occurs is within the Inter- montane Belt, underlain dominantly by Lower to Middle Jurassic volcanic and sedimentary rocks of the Hazelton Group. These as- semblages 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 consists of narrow quartz-molybdenite veins in fractures striking 020 to 040 degrees within Nithi quartz monzonite. Mineralization is accompanied by disseminated pyrite and slight kaolinization and feldspar alteration.

For full work history see nearby Nithi Mountain (MINFILE 093F  012) occurrence.

Bibliography
EMPR ASS RPT 5489, 5714, 5915, 8399, 8470, 9110, 9368, 10314
EMPR EXPL 1975-E132; 1976-E142; 1978-E202; 1980-323; 1982-292;
1992-69-106
EMPR GEM 1973-327
EMPR FIELDWORK 1992, pp. 475-481; 1993, pp. 9-14; 1994, pp. 167-170,
193-197
EMPR AR *1963-36; 1965-138,Figure 24; 1966-118
EMPR PF (See 093F General File, Nithi Mountain Area Maps; See 093K
General file, Endako Area Maps; Nithi Mountain geology map 1964)
GSC P 90-1F, pp. 115-120
GSC MEM 324
GSC MAP 1131A; 1424A

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