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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  15-Jan-2018 by Nicole Barlow (NB)

Summary Help Help

NMI 092I7 Cu20
Name BERTHA - MOLLY, DUNMORE, DUPONT, WRT, WINDSOR, LOST Mining Division Kamloops, Nicola
BCGS Map 092I047
Status Past Producer NTS Map 092I07E
Latitude 050º 26' 36'' UTM 10 (NAD 83)
Longitude 120º 42' 41'' Northing 5590427
Easting 662497
Commodities Copper, Silver Deposit Types
Tectonic Belt Intermontane Terrane Quesnel
Capsule Geology

The Bertha-Molly occurrence is situated south of Meadow Creek, approximately 4 kilometres southeast of Logan Lake and 35 kilometres north of Merritt.

The Dupont Lake area is underlain mainly by Upper Triassic Nicola Group intermediate volcanics and derivatives. Approximately 8 kilometres to the west, Nicola Group rocks are in contact with the Lower Jurassic Guichon Creek Batholith. Quartz diorite outcrops southwest of Dupont Lake.

In 1942, George Campbell did some surface-stripping on a copper showing, approximately 457 metres west of an old shaft. Production from this occurrence, known as the Lost group, was 31 tonnes and yielded 218 grams of silver and 626 kilograms of copper.

The Bertha-Molly showing is hosted by purplish amygdaloidal andesites with intercalated reddish tuffs. These rocks are strongly fractured and chloritized. The original shaft was sunk at a point where patches of cuprite occur in fractures. Small shipments were made.

Recent development has exposed malachite, azurite, chalcopyrite, cuprite and pyrite hosted by shears and fracture-fillings in vesicular volcanics and red tuffs. Mineralization is structurally controlled with an apparent north trend. A common alteration is calcite and epidote, with silicification becoming stronger at depth.

The Bertha occurrence is part of the Bertha property owned by Guy and Christopher Delorme. In 2015, Laurence Sookochoff, working on behalf of the Delormes, carried out a structural analysis and 2 kilometres of localized magnetometer surveying approximately 2 kilometres to the west of the Bertha occurrence.

EMPR AR 1929-228; 1930-195; 1942-A26,A69; 1955-37; 1956-46; 1958-29; 1959-38,143
EMPR ASS RPT 265, 3668, 3763, 3764, 14959, 15060, 17337, 18048, 36058
EMPR EXPL 1986-C228; 1988-C111; 1989-119-134
EMPR GEM 1972-183
EMPR OF 1998-8-K, pp. 1-22
GSC MAP 44-20A; 886A; 887A
GSC MEM 249, p. 126
GSC OF 980