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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  27-Nov-2014 by Laura deGroot (LDG)

Summary Help Help

NMI
Name MOTHERLODE Mining Division Nelson
BCGS Map 082F006
Status Showing NTS Map 082F02W
Latitude 049º 02' 48'' UTM 11 (NAD 83)
Longitude 116º 58' 16'' Northing 5432644
Easting 502111
Commodities Copper, Silver, Gold, Lead Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
I01 : Au-quartz veins
Tectonic Belt Omineca Terrane Ancestral North America
Capsule Geology

The Motherlode showings were staked in 1937 on a small south-flowing tributary, about 1.5 kilometres north of its junction with Monk Creek on the southwest slopes of Mount Irene at 1700 to 1850 metres elevation. The Copper Queen (082FSE053) of similar mineralization may adjoin on the south, at slightly lower elevation; see also the Irene (082FSE134) located in Char Creek to the north (Assessment Report 22054).

Mineralization occurs in sheared greenstone of the Irene Volcanic Formation, underlain to the east by pebble conglomerate of the Toby Formation. Both these units are part of the Horsethief Creek Group of Upper Proterozoic age, and are metamorphosed to chlorite facies of regional greenschist metamorphism. Mineralization is associated with a zone of fracturing and veining that trends northerly and dips steeply west, across a maximum width of 6 metres and strike length of 75 metres as exposed in numerous surface trenches and opencuts. In addition to rusty gossan, pyrite, chalcopyrite, pyrrhotite and a little galena are exposed in a gangue of quartz, ankeritic carbonate and sericitic material. Samples of dump material assay up to 2.4 per cent copper, 154 grams per tonne silver and trace gold; rusty gossan (in which gold is probably enriched) assay up to 7 grams per tonne gold (Minister of Mines Annual Report 1937).

Bibliography
EMPR AR *1937-E40
EMPR ASS RPT 22054
EMPR FIELDWORK 1994, pp. 135-155
EMPR PF (Prospectors Report 1999-9 by Ron Granger)
GSC MAP 603A
GSC MEM 228
GSC OF 929; 2721

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