- SMDI #
- 2252
- Current Showing Name
- Peninsula Prongua Lake Cu-Au Showing
- Historical Showing Names
- Peninsula Prongua Lake Cu-Au Showing
- Company Name
- Project Name
- UTM Easting (NAD83 Z13)
- 615756.8300
- UTM Northing (NAD83 Z13)
- 6111412.0800
- NTS Sheet
- 063M03
- TRM (Township-Range-Meridian)
- 71-08-2
- Primary Commodities
- Copper
- Associated Commodities
- Gold, Iron, Manganese, Nickel, Zinc
- Discovery Type
- Outcrop Grab
- Status
- Occurrence: Primary Exploration
- Geological Details
- The Peninsula Prongua Showing is located on a peninsula that extends into Prongua Lake on the west side of the lake approximately 0.6 mile (0.97 km) from the north tip of the lake.
The area northwest of Prongua Lake is underlain by fine-grained, dark green mafic volcanics that have been intruded by medium green subvolcanic mafic sills and dykes. This sequence of rocks have been subjected to amphibolite facies metamorphism. Only rarely are primary structures such as pillows preserved. The area around Prongua Lake is underlain by a medium grained tonalite intrusive and locally by gabbro and diorite subordinate phases of the same intrusion. Mafic inclusions, xenolith layers and relict mafic rafts are common and often are sites of strain and sulphide mineralization (Delaney, 1991). Northwest of Prongua Lake a multiphased diorite plug that contains abundant xenoliths cuts the mafic assemblage (Sibbald, 1978). Sibbald observed copper mineralization in this plug.
Structurally, the showing area is located approximately 3 km (1.9 miles) west of the Tabbernor Fault. This fault is flanked by a 200 to 1500 m (656.2 to 4,921.3 ft) wide zone of strain - the Tabbernor Strain Zone. Wilcox (1990) noted two distinct periods of deformation in rocks close to the Tabbernor Fault. The first phase of deformation produced a foliation and minor high strain zones. The second phase of deformation deflected primary deformation structures in the Prongua area and created new structures. In the Prongua Lake area this has resulted in the formation of discrete mylonite zones and major northeast trending lineaments that change orientation to north trending close to the Tabbernor Fault. Wilcox (1990) feels the Tabbernor Fault has evolved from a open oblique reverse fault to a sinistral wrench fault and finally to a brittle sinistral fault.
The Peninsula Prongua Showing occurs at the sheared contact between tonalite and a raft of mafic meta-volcanic. The showing is hosted by a series of rust weathering, dismembered and boudinaged, milky quartz veins that have developed in this north-south trending dextral shear (likely part of the Tabbernor Strain Zone). The quartz veins vary from 5 to 50 cm (2.0 to 19.7 inches) in width and have been traced over a strike length of 25 m (82.0 ft).
The vein-hosted mineralization consists of pyrite, pyrrhotite, chalcopyrite, bornite, azurite, malachite and visible gold.
In 1987, the showing was stripped, trenched and sampled. The better assay returns are as follows:
SAMPLE PPB OZ./TON PPM PPM
NUMBER AU AU AG CU
___________________________________
28011 ---- 0.039 ---- ----
28022 2720 ----- 6.00 ----
28023 2420 ----- 4.10 1.82%
28094 2780 ----- ---- 9100
A12802 10900 ----- 27.00 283 800 m W of showing
- Geological Domain
- Glennie
- Host Rocks
- Host Minerals
- Indicators
- Exploration History
- 5/15/1991 In 1968, Hudson Bay Exploration and Development Co. Ltd. acquired Permit No. 1 over this area but no work was done in the vicinity of the occurrence. The permit was subsequently allowed to lapse in 1971.
In 1969, E. Partridge staked the area as part of CBS 1999. No work was recorded on the claim block.
In 1972, while mapping the Sandy Narrows (east) map sheet for the Saskatchewan Department of Mineral Resources, T.I.I. Sibbald discovered the mineralization that constitutes the Wing Showing. Three grab samples were taken by Sibbald at the Wing Showing (SMDI 0335). During the same mapping project, Sibbald noted malachite staining and chalcopyrite on a peninsula on the northwest shore of Prongua Lake (Prongua Peninsula Showing), 0.25 mile (0.40 km) west of Wing Lake (West Wing Showing) and on the west shore of Prongua Lake midway up the lake (Prongua Showing).
On 22 April 1986, Wayne Fisher staked these mineralized locations as CBS 7073. Between 1986 and 1987, Fisher prospected the property and stripped, trenched and sampled the four showings (AF 63M03-0033).
On 1 June 1989 Placer Dome Incorporated optioned the property from Fisher (80% Placer Dome, 20% W. Fisher). In 1989, Placer Dome completed ground EM and magnetic surveys (AF 63M03-0035) and geologically mapped one grid (AF 63M03-0010). In 1990, the partners completed further geological mapping, prospecting, and rock sampling which covered the showing (AF 63M03-0038). Better sample results are reported above. In 1991, a Homestake Canada Ltd-Placer Dome Inc. completed ground a IP-resistivity survey over the showing (AF 63M03-0039).
- Production History
- Reserves and/or Resources