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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  25-Oct-2007 by Laura deGroot (LDG)

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NMI 104G7 Cu1
Name RUN, MIX Mining Division Liard
BCGS Map 104G026
Status Showing NTS Map 104G07W
Latitude 057º 17' 53'' UTM 09 (NAD 83)
Longitude 130º 54' 14'' Northing 6352169
Easting 385278
Commodities Copper, Gold, Molybdenum Deposit Types
Tectonic Belt Intermontane Terrane Stikine, Plutonic Rocks
Capsule Geology

This occurrence is located near the eastern boundary of a complex belt of rocks, up to 10 kilometres wide and 50 kilometres long, between Mess and Shaft Creek. East of Mess Creek is a broad north trending belt of Cenozoic volcanics while west of Schaft Creek three different Mesozoic intrusive units form another broad north trending belt. Major north trending faults occupy the valleys of the two creeks. The complex terrain between the creeks is composed mainly of Upper Triassic volcanics and derived sediments. The oldest rock in the belt are Permian limestone that appear to be in fault contact with the volcanics. Upper Triassic basaltic augite porphyry occurs as large dyke-like bodies cutting the volcanic pile. Quartz monzonite and dioritic rock form small stocks and tabular bodies throughout this belt and are likely related to one of the three intrusive bodies. Rhyolite and diabase dykes of Cenozoic(?) age are also numerous.

This showing, just east of Mess Creek, is underlain primarily by Upper Triassic green andesitic pyroclastics and derived sediments that are intruded by two parallel northerly trending dyke swarms. The pink feldspar porphyry dykes are from 1 to 10 metres thick and are of syenitic composition. They have been related to similar Tertiary-Cretaceous syenites in the Telegraph Creek area (Panteleyev, GEM 1973).

Feldspathization (pink) is the most common alteration, almost completely altering large volumes of volcanic rock adjacent to the feldspar porphyry intrusions. This type of alteration is usually accompanied by strong quartz veining. Carbonate alteration and strong chlorite and/or argillic alteration is present.

Pyrite is abundant throughout the area averaging from 1 to 3 per cent but may be as high as 10 per cent. Chalcopyrite, chalcocite, bornite, molybdenite, magnetite, and hematite occur often as fracture fillings and with quartz veins in the volcanic rock and as dissemina- tions in the monzonite. The best showings occur near the contacts between the dyke swarms and the green andesitic rocks. One drill core sample contained 4.7 grams per tonne gold over a 1.5 metre length. Another 1 metre sample contained 0.37 per cent copper. The highest grades of gold are found in altered volcanics near the intrusive. One grab sample contained 10.8 grams per tonne gold (Assessment Report 15603).

EMPR ASS RPT 3093, 3577, 3989, 4100, 4755, *6162, 6391, 6875, 10682
10711, *15603
EMPR EXPL 1976-E185; 1977-E225; 1980-473; 1982-384,385
EMPR GEM 1971-39; 1972-529; *1973-504
EMR MP CORPFILE (Coseka Resources Ltd.; Wharf Resources Ltd.)
GSC MAP 9-1957; 11-1971, 1418A
GSC P 71-44