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File Created: 17-Apr-2008 by Garry J. Payie (GJP)
Last Edit:  30-May-2008 by Garry J. Payie (GJP)

Summary Help Help

NMI
Name SILICA CAP, RED CAP Mining Division Atlin
BCGS Map 104K074
Status Showing NTS Map 104K11W
Latitude 058º 43' 56'' UTM 08 (NAD 83)
Longitude 133º 16' 53'' Northing 6511510
Easting 599490
Commodities Gold, Silver, Molybdenum, Copper, Lead, Zinc Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
H04 : Epithermal Au-Ag-Cu: high sulphidation
K : SKARN
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The area of the Silica Cap zone is underlain by the contact of a quartz dioritic intrusion of the Late Cretaceous Wind Table Complex with intermediate (andesitic) volcanics of the Lower Jurassic Takwahoni Formation (Laberge Group).

The Silica Cap zone was identified in 1982 and is found to the southwest of the Slope zone along the lower reaches of Copper and Moly creeks (Assessment Report 21687, Figure 3). This zone has been considered to represent a high temperature skarn feature by virtue of characteristic alteration mineralogy of: silica, actinolite, epidote, garnet, pyrite, magnetite, tourmaline, and pyrrhotite, plus sulphides of chalcopyrite, galena, sphalerite, molybdenum and arsenic. Samples were anomalous for gold and strongly anomalous in silver. The highest value from a rock sample taken from a broken quartz-copper-lead-zinc-molybdenum vein in the Moly Creek shear, was 16.55 grams per tonne gold and 214.5 grams per tonne silver (Assessment Report 18803, Figure 4). Davis and Jamieson (Assessment Report 25970) suggest that the presence of a silica cap on the property would indicate that a late-staged epithermal gold system may have overprinted porphyry mineralization once the intrusion had been unroofed by erosion.

The Slope (104K 010), Ridge (104K 085) and East Cirque zones are considered by Wilkins and MacKinnon (Assessment Report 18803) to be part of one large porphyry system with the Slope representing the stockwork and sheeted vein-hosted copper and molybdenum mineralized core. The Ridge and East Cirque zones to the northeast of the Slope and possibly “Moly and Copper creeks” (Silica Cap) to the southwest may represent structurally controlled conduits for sulphide bearing hydrothermal solutions.

Please refer to the Slope occurrence (104K 010) for details of the area geology and a common work history.

Bibliography
EMPR EXPL 1999-19-31
EMPR OF 1994-3; 1995-5
EMPR AR 1930-121; 1931-63
EMPR EXPL 1980-554; 1982-398; 1983-547
EMPR GEM 1971-51; 1972-554
EMPR FIELDWORK 1993, pp. 171-197; 1994, pp. 321-342
EMR MP CORPFILE (Omni Resources Inc.)
GSC MAP 6-1960; 931A; 1262A
GSC MEM 248, pp. 70,73; 362, p. 55
GSC P 45-30

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