- SMDI #
- 1386
- Current Showing Name
- U Showing 50-CC3-23; Fredette Lake A to D Oreshoots; Pinky Lake Fault Zone Showing
- Historical Showing Names
- U Showing 50-CC3-23; Fredette Lake A to D Oreshoots; Pinky Lake Fault Zone Showing
- Company Name
- Project Name
- UTM Easting (NAD83 Z13)
- 299885.7400
- UTM Northing (NAD83 Z13)
- 6613386.2100
- NTS Sheet
- 074N10
- TRM (Township-Range-Meridian)
- 122-15-3
- Primary Commodities
- Uranium
- Associated Commodities
- Iron
- Discovery Type
- Trench
- Status
- Prospect: Primary Exploration
- Geological Details
- The showing, later called the Pinky Fault Zone by SMDC, is in the immediate footwall rocks of the Pinky Fault near the junction with the Black Bay Fault.
The area is underlain by granitic country rocks which have been chloritized, brecciated and extensively iron-stained for a strike length of 3509 ft (1069.5 m) and width up to 50 ft (15.2 m). K. Ashton et al later re-mapped the host rocks as unit Qfn or grey, white to buff,and pink, fine- to medium-grained, non-magnetic quartzofeldspathic gneisses with minor D-2 diabase dykes. Ashton felt they were derived from sedimentary rocks and/or anatectic granitoid rocks.
At the showing, the radioactivity is several times greater than normal and in some locations, small patches of secondary uranium minerals are visible. Radioactivity occurs in N70°E to S80°E-striking fractures which dip to the south. The fractures are often carbonate-filled and disseminated pitchblende is associated with hematite and carbonate.
Trenches were blasted over the radioactive zone in 1950. Seventy two samples were taken across 3 ft lengths and an assay high of 0.27% U3O8 (0.23% U) was returned. Most of the assays ranged from 0.02% to 0.09% U3O8 (0.017% to 0.076% U). Sampling indicated that the northeast part of the radioactive zone graded 0.0425% U3O8 (0.036% U) across 28 ft (8.5 m) for a strike length of 120 ft (36.6 m). The highest assay obtained was 0.115% U3O8 (0.098% U) across 6 ft.
A narrow calcite veinlet containing disseminated pitchblende is exposed at the base of the most northeasterly trench. The vein is less than two inches wide which indicates only a small amount of high grade material is present in the zone. Four individual ore shoots make up the zone. The shoots were assayed separately and returned the following:
Shoot Assay (% U3O8) (% U) Sample Length
____________________________________________
A 0.082 0.070 6 ft
B 0.072 0.061 7.5 ft
C 0.033 0.028 7 ft
D 0.053 0.049 28.5 ft
Diamond drill holes completed over the area in 1951 returned a best intersection of 0.19% U3O8 (0.16% U) over a core length of 31.6 ft. Several radioactive occurrences were located in the area by SMDC and Agip in 1978. A short list is given below.
Name Radioactivity Description
(cps)
__________________________________________________________________________
M-22 8000 yellow oxides in vertical fracture trending 140° in
hematized feldspar-quartz rock
M-23 7500 yellow oxides in feldspar-quartz zone 1 m x 1 m near
the Pinky Fault
M-24 10,000 pitchblende, yellow oxides in 1 m x 1 m zone
M-25 7000 yellow oxides within irregular fracture in quartz
feldpsar rock
M-26 10,000 yellow oxides in three occurrences 5 m apart in
fractures at 100°/74°S cutting amphibolite
M-27 10,000 pitchblende, yellow oxides within fractured hematized
feldspar-quartz rock
M-28 10,000 fractured and hematized feldspar quartz rock
M-29 8800 minor yellow oxides within hematized fractured
feldspar-quartz rock
W-35 5000 pitchblende, yellow oxides and quartz within fractured
feldspathic quartzite with abundant quartz veins
W-36 6800 quartzite containing bands of chlorite schist
W-37 5200 irregular, hematized band 30 cm wide in
amphibole-feldspar gneiss
- Geological Domain
- Zemlak
- Host Rocks
- Host Minerals
- Hematite
- Indicators
- Exploration History
- 8/1/1989 The showing was located by Aurora Yellowknife Mines Ltd. during prospecting of their DD-3 Concession in 1950 (AF 74N10-0056). The showing, originally termed the 50-CC3-23 Showing, is located at the intersection of the Pinky and Black Bay faults.
The radioactive zone was trenched and sampled by Aurora in 1950. Eleven diamond drill holes were completed over the zone by Aurora in 1951 (AF 74N10-0080) and all intersected radioactive zones in the footwall rocks of the Black Bay fault. The Pinky Fault was tested in 1954 at 350 ft intervals by 10 diamond drill holes for 2600 ft southwest of the showing (AF 74N10-0130). It is believed that the results were not encouraging as only three narrow widths returned interesting values.
Purdee Amalgamated Mines drilled 10 holes on and near the zone but only two intersected U3O8 levels exceeding 0.05% over narrow widths (AF 74N10-0078).
S. and D. Cochrane high-graded the showing in 1959.
In 1969, Pathfinder Uranium Mine's ESSO claim No. 6 covered the showing. Pathfinder completed a ground scintillometer survey (AF 74N10-0395).
The area of CBS 5499 was explored in 1978 by SMDC as part of their Uranium City project (AF 74N09-0285). Diamond drilling, lake sediment and soil sampling, prospecting, geological mapping and ground EM and magnetic surveys were completed over the area.
In 1987, a Silversides Resources-AGIP resources-SMDC joint venture completed a reconnaissance program of geological mapping, prospecting and regional lithogeochemical sampling over CBS 5499 (AF 74N09-0297). The lithochemical sampling led to a follow-up program of 20 m detailed sampling of the showing, which SMDC named the Pinky Fault Showing.
On 23 April 1994, Greater Lenora Resource Corporation staked the showing as S-102826. In 1997, they flew an airborne EM, magnetic, and spectrometer survey over the property (AF 74N-0007). On 1 October 2000, the claim lapsed.
- Production History
- Production Period: 1959-01-01 to 1959-12-31
100.00 tons
In 1959, S. and D. Cochrane highgraded the showing. One hundred tons of rock were removed.
- Reserves and/or Resources