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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  14-Jan-2004 by Robert H. Pinsent (RHP)

Summary Help Help

NMI 082K11 Pb5
Name SUPERIOR (L.12849), NELSON (L.12848), MAGNOLIA (L.12850), SILVER BOTTOM (L.4451) Mining Division Slocan
BCGS Map 082K065
Status Prospect NTS Map 082K11E
Latitude 050º 38' 18'' UTM 11 (NAD 83)
Longitude 117º 09' 09'' Northing 5609619
Easting 489216
Commodities Gold, Silver, Lead, Zinc Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
J01 : Polymetallic manto Ag-Pb-Zn
Tectonic Belt Omineca Terrane Ancestral North America
Capsule Geology

The Superior showing is at the head of Hall Creek, a northeast flowing tributary of the Duncan River. The Superior (L.12849) claim is on strike to the southeast of the Bannockburn (L.4450) and is separated from it by Silver Bottom (L.4451). The showing is part of a cluster of that includes the Bannockburn [082KNW051] and Sheila [082KNW052] prospects. The Nelson (L.12848) and Magnolia (L.12850) claims are unconnected tenures in the vicinity of the Bannockburn. The Magnolia is on the northeast side of the Bannockburn and the Nelson is on the northeast side of Silver Bottom.

The Superior vein covers the southeast extension of the Bannockburn vein. It is exposed in crosscuts and tunnels. In 1917, there were three crosscuts and a fourth was under construction. The lowest was driven for 58.5 metres in rubble and the middle one was driven 31.0 metres before intersecting a 1.52 metres wide zone of low grade, mineralized limestone.

In 1955, Granby Consolidated Mining Smelting and Power Company conducted a surface packsack drilling program (12 holes for a depth of 15.24 metres each) on what is now the Sheila [082KNW052] prospect. It located a 3.0 to 4.57 metres wide band of mineralized limey quartzite that contained disseminated galena, sphalerite and minor pyrite. The company appears to have traced the band southeast from Hall Creek across the Bannockburn, Buckeye, Silver Bottom claims and onto the Superior [082KNW054] crown grant. However, it has only been explored for approximately 700 metres. In 1984, Bannockburn Resources Limited owned the Superior property.

The Trout Lake area is underlain by a thick succession of sedimentary and volcanic rocks of the Badshot Formation and Lardeau Group near the northern end of the Kootenay arc, an arcuate, north to northwest trending belt of Paleozoic and Mesozoic strata that is now classified as a distinct, pericratonic, terrane. The arc rocks are bordered by Precambrian quartzite in the east and they young to the west, where they are bounded by Jurassic-age intrusive complexes. They were deformed during the Antler orogeny in Devonian-Mississippian time and were refolded and faulted during the Columbian orogeny, in the Middle Jurassic. A large panel, the "Selkirk allochthon", was later offset to the northeast by dip-slip motion along the Columbia River Fault.

The Badshot Formation is composed of a thick Cambrian limestone that is a distinctive marker horizon in the Trout Lake area. It is underlain by Hamill Group quartzite and it is overlain by a younger assemblage of limestone, calcareous, graphitic and siliceous argillite and siltstone, sandstone, quartzite and conglomerate, and also mafic volcanic flows, tuffs and breccias, all of which belong to the Lardeau Group. The rocks are isoclinally folded and intensely deformed, but only weakly metamorphosed. They occur as intercalated beds of marble, quartzite and grey, green and black phyllite and schist. Fyles and Eastwood (EMPR BULL 45) subdivided the group into six formations (Index, Triune, Ajax, Sharon Creek, Jowett and Broadview) of which the lowermost (Index) and uppermost (Broadview) are the most widespread. The Triune (siliceous argillite), Ajax (quartzite) and Sharon Creek (siliceous argillite) are restricted to the Trout Lake area. The Jowett is a mafic volcanic unit.

The Superior claim straddles the axes of a pair of tight, steeply dipping, isoclinal folds in Marsh Adams formation quartzite, schist and limestone in the footwall of the Badshot limestone. The "Marsh Creek Anticline" is the same fold that controls the location of replacement ores in carbonate-rich quartzite on the Sheila property. The Superior tenure is on strike to the south and east of the Sheila [082KNW052] and Bannockburn [082KNW051] and it covers the same mineralized structures.

There are two styles of mineralization on the Superior claim. There is a typical vein exposed in the old workings. In the top crosscut, it is a 0.15 metre wide "ledge" of quartz and carbonate with galena, sphalerite and pyrite located along a contact between schist and limestone. Bannockburn Resources Limited, described it as being a subhorizontal vein, approximately 1.0 metre wide, at the crest of a major anticline. Average assayed values over a 25-metre exposed length were reported to be 13.71 grams per tonne gold, 497.1 grams per tonne silver and 31 per cent lead. Also, a vertical vein, 0.3 to 1.0 metre thick and exposed over a 15-metre strike length was reported to contain average assay values of 788.6 grams per tonne silver, 42 per cent lead and 9.0 per cent zinc. In addition to veins, the tenure should also cover the southeast extension of the stratabound quartzite unit that contains replacement mineralization on the Sheila property. There, disseminated galena occurs in a calcareous quartzite unit near the top of the Marsh Adams Formation.

EMPR AR *1918-K165; 1919-N122; 1923-A387; 1955-67; 1959-70; 1960-78
EMPR ASS RPT 6729, 12873
EMPR INF CIRC 1989-1, p. 24
EMPR OF 1990-24
GSC MEM *161 p. 78
EMPR PFD 20545