- SMDI #
- 0659
- Current Showing Name
- Dalf Lake Cu Occurrences
- Historical Showing Names
- Dalf Lake Cu Occurrences
- Company Name
- Project Name
- UTM Easting (NAD83 Z13)
- 666767.5400
- UTM Northing (NAD83 Z13)
- 6622625.0600
- NTS Sheet
- 064M09
- TRM (Township-Range-Meridian)
- 123-01-2
- Primary Commodities
- Copper
- Associated Commodities
- Vesuvianite, Zinc
- Discovery Type
- Outcrop Grab
- Status
- Occurrence: Primary Exploration
- Geological Details
- The main occurrence is located on the southwestern shore of Dalf Lake in an outcrop of dolomitic marble.
The area is underlain by northeast-trending, isoclinally folded rocks of the Aphebian Many Islands Belt correlated to the Hurwitz Group of the Northwest Territories; affinity to the Wollaston trend is uncertain. The sequence is dominantly composed of semi-pelites and carbonates in the hornblende-hornfels facies and were deposited on an unconformable crystalline basement which flanks them to the southeast.
Chalcopyrite occurs as syngenetic disseminated grains in a 2 inch (5.1 cm) thick calc-silicate bed and also along fracture planes in sheared carbonate near Dalf Lake, and 0.7 miles (1.1 km) west-southwest of Dalf Lake. In 2002, C.T. Harper et al re-mapped the host rock as a northeast-trending band of white, tan to light brown weathering, medium- to coarse-grained, well bedded/layered marble to dolomite (unit HWm) that, locally, contains bedding-parallel concentrations of wollastonite and/or tremolite, and/or diopside, light brown phlogopite, traces of idocrase, scapolite, and the local development of pink to red rhodochrosite and manganite. Some pyrite commonly occurs with the chalcopyrite. Green copper stain was observed on weathered calc-silicate surfaces in the Dalf Lake area, and 3 miles (4.8 km) north on the western side of Chekask Lake. A narrow malachite vein was also found a few miles were at Dutton Lake.
Gossan, associated with pyrite oxidation in limestone, was noted 4.5 miles (7.2 km) southwest on the west shore of South Grabowski Lake as well as throughout the area. Streaks and specks of sulphide were noted in meta-arkose as well as pyrrhotite, magnetite and tetrahedrite in the Jay Lake area. Cordierite occurs in very fine grained quartz-biotite-muscovite schists 3.8 and 5.1 miles (6.1 and 8.2 km) southwest of Chobaniuk Lake and 2.1 miles northwest of this lake, idocrase was noted in frost heaves of marble.
Four samples collected from semipelite at the northern end of Many Islands Lake, 3.4 miles (5.5 km) north of the showing, assayed 0.24 to 0.54% Zn and 0.004 to 0.008 % U3O8. One sample from the Jay Lake area 5 miles (8 km) north of the main occurrence assayed 0.44% Zn and 0.004% U3O8.
R. Munday mapped the area in 1971 and several occurrences were located. Grab samples were collected of copper mineralization in the area and analyzed. The results are as listed.
COPPER SAMPLE
CONTENT DESCRIPTION
___________________________________________________
2.00% disseminated syngenetic chalcopyrite
in a 2" calc-silicate bed
0.16% chalcopyrite along a shear zone in
carbonates
0.14% chalcopyrite in brecciated calc-silicate
40 ppm green copper stained carbonate
- Geological Domain
- Ennadai
- Host Rocks
- Host Minerals
- Indicators
- Exploration History
- 7/19/1989 Activity was first recorded in this area in 1969 when Canadian Aero Services Limited flew an airborne radiometric survey over the area as part of the work done on the Jupiter Explorations Ltd. Permit No. 2 to the north (AF 64M10-0001). Geological reconnaissance mapping and prospecting was carried out by A.G. MacKenzie Mining Consultants Ltd. in 1969. At the same time, Lincoln Oils Ltd. did an airborne GRS survey over the area followed by a ground check of the thorium belt and an overall property evaluation (AF 64M08-0003). G.V. Lloyd Exploration Ltd. did a photogeological uranium study and C.W. Hunt Exploration Ltd. conducted a biogeochemical survey.
In 1970, CBS 1086 to CBS 1089 were staked by Warren Hunt in the Jupiter Permit No. 2 which was allowed to lapse the same year. A more detailed plant and soil geochemical survey was conducted on these claim blocks in the Jay Lake area 5 miles (8.0 km) north of the main occurrence (AF 64M16-0002). Several geochemical anomalous zones were outlined in the Jay Lake area and subsequently an EM-16 survey was conducted on CBS 1086 (AF 64M16-0002). A main anomalous EM zone was outlined on the northwest and east shores of Jay Lake. Pyrrhotite, magnetite and tetrahedrite were frequently found in small disseminated quantities in the area.
Gulf Minerals Ltd. did limited exploration that same year in the area. This work included airborne EM and magnetic and radiometric surveys as well as reconnaissance geological mapping (AF 64M08-0004).
No further activity was recorded in the area until 1971 at which time the main occurrences were discovered by R.J.C. Munday while mapping for the Saskatchewan Department of Mineral Resources. Grab samples were collected and returned the values listed above.
No further work was recorded and CBS 1087 to 1890 lapsed in 1972 and CBS 1086 lapsed in 1973.
- Production History
- Reserves and/or Resources