- SMDI #
- 2460
- Current Showing Name
- Drill holes MJ-3, MJ-7, MJ-8
- Historical Showing Names
- Drill holes MJ-3, MJ-7, MJ-8
- Company Name
- Project Name
- UTM Easting (NAD83 Z13)
- 510400.6100
- UTM Northing (NAD83 Z13)
- 6457392.1700
- NTS Sheet
- 074I07
- TRM (Township-Range-Meridian)
- 107-17-2
- Primary Commodities
- Uranium
- Associated Commodities
- Cobalt, Copper, Lead, Nickel, Rare Earth Element (Unspecified)
- Discovery Type
- Drillhole
- Status
- Prospect: Primary Exploration
- Geological Details
- The showing or diamond drill hole MJ-3 is located 1.6 km (1.0 mile) southwest of the southwest tip of the most westerly bay on Johnston Lake.
In the showing area, approximately 7 m (23.0 ft) of Pleistocene to Recent tills and soils cover the underlying rocks. NTS Area 74I was partially mapped by Ramaekers in 1976 as consisting of Helikian Athabasca Group rocks (Ramaekers, 1976) made up of fluviatile quartz sandstone containing little clay-sized material, but much conglomerate in the basal section. In the area around drill hole MJ-3, the Athabasca Group Manitou Falls Formation consists of sub-units MFb, MFc, and MFd. The basal member of this formation, which is designated MFa, is absent. Unit MFb, which is 389.3 m (1277.2 ft) thick, consists of a sequence of interbedded fluviatile quartz sandstones and conglomerates. Overlying unit MFc, which is 61.3 m (201.1 ft) thick, consists of a sequence of bedded quartz sandstones and overlying unit MFd, which is 152.4 m (500.0 ft) thick, consists of a sequence of sandstones that are rich in clay interclasts. The lower 50 m (164.0 ft) of member MFb above the unconformity exhibits bleaching, friability, and clay and secondary hematite in the sandstone matrix.
The Aphebian bedrock below the unconformity, in the area around drill hole MJ-3, consists of a sequence of sulphide and graphite rich (5 to 20%) metapelites that alternate with pegmatoid "sweat" rocks. The basement metapelites exhibit strong chloritization and minor hematization in the first 15 metres below the unconformity. The metapelites are crosscut by fracture controlled pyrite-chalcopyrite±carbonate veinlets.
Both the basement rocks and the overlying Athabasca Group sandstones exhibit strong fracturing. The basement rocks are strongly fractured throughout and the fracturing in the sandstones appears to be related to two faults. These faults occur between 23.3 and 25.5 m and between 43.4 and 50.0 m.
The basement mineralization encountered in drill hole MJ-3 consists of disseminations of uranium oxides and associated minor pyrite, galena, sphalerite, and chalcopyrite which occur as fracture fillings within a graphitic metapelite. The better intersections are as follows:
DRILLHOLE INTERSECTION WIDTH PPM PPM PPM PPM PPM PPM ROCK
NUMBER (M) (M) U PB NI CO CU ZN TYPE
____________________________________________________________________________
MJ-3 612.5 - 612.7 0.2 150 1800 67 10 416 444 pelite
612.7 - 613.0 0.3 70 433 76 12 101 21 pelite
618.5 - 618.7 0.2 490 632 103 25 22 12 pelite
618.7 - 619.0 0.3 4100 215 133 24 23 13 pelite
626.7 - 627.0 0.3 520 106 161 9 125 224 pelite
MJ-6 598.3 : grab sample 865 7 219 68 3 31 pelite
599.3 : grab sample 615 7 160 108 3 112 pelite
Note the intersection 599.3-000.0 returned 6094 ppb Au
MJ-7 656.0 - 656.5 0.5 242 174 50000 18000 11 211 pelite
656.5 - 657.0 0.5 46 144 28100 18300 9 103 pelite
657.0 - 657.5 0.5 15 29 16000 15200 6 340 pelite
658.4 - 659.0 0.6 302 247 99600 43200 18 1001 pelite
MJ-8 581.4 - 581.9 0.5 1980 412 228 91 94 11 sst
581.9 - 582.5 0.6 2140 771 284 144 352 59 sst. AF 74I07-0021 drill program in 2010 in the vicinity of hole MJ-3. Drill hole JL10-17 (6457570 N, 510479 E; -85, 343): 45 ppm U(p)/0.3 m from 609.0-609.3 m at the basal unconformity with highly anomalous Ce(t) from 607-609 in basal Athabasca sedimentary rocks. Drill hole JL10-21RD1 (6457584 N, 510562 E; -86, 163): 286 ppm U(p)/0.9 m from 614-614.9 m immediately below the basal unconformity in intensely clay-altered basement with pyrite and chalcopyrite. Includes anomalous Cu(p), Ce(t), and Th(t). Three hole drill program in 2011 on MJ-1 conductor. Drill hole JL-25R (6457590 N, 511391 E; -86/163); unconformity at 576.6 m; intersections of 428 ppm U(p)/0.4 m from 636.6-637.0 m, and 659 ppm U(p)/0.6 m from 638.5-639.1 m in granitized anatexite immediately above a major fault zone with highly brecciated lithologies. Includes anomalous Cu(p) from 636.3-653 m with a high value of 1410 ppm/0.9 m from 643.1-644 m. Highly anomalous REE from 636.3-636.9 m. Drill hole JL11-26 (6457564 N, 510561 E; -84/163); unconformity at 620.6 m. Intersections of 300 ppm U(p), 503 ppm Co(p), 315 ppm Ni(p), 1030 ppm As(p), 2.7 ppm Ag(p), 4.55% P2O5/0.1 m from 634.4-634.5 m in graphitic pelitic gneiss; and anomalous Co(p), Cu(p), Ni(p), As(p) from 669.4-682 m in a graphitic fault zone. Follow up drill hole JL11-27 (6457865 N, 509371 E; NAD 83/Zone 13; -85/163) in 2011 collared 90 m north of hole MJ-7. Intersections of 910 ppm U(p)/0.9 m from 650.1-651.0 m immediately underlying the basal unconformity at 650.1 m with anomalous Co, Cu, Ni and REE in intensely clay-altered pelitic gneiss; and 1518 ppm Co(p), 972 ppm Ni(p)/1.0 m from 668.5-669.5 m in weakly-altered semi-pelitic gneiss with pyritic fracture coatings.
- Geological Domain
- Mudjatik
- Host Rocks
- Host Minerals
- Indicators
- Exploration History
- 9/3/1992 The area was first covered by Buttes Petroleums and Resources Ltd. Permit No. 1. In 1969, Buttes completed an aeromagnetic and gravity study that included the general showing area (AF 74I07-0001). The permit lapsed by 1978.
In March of 1978, the showing was covered by SERU disposition Ernest Walter Bazinet Permit No. 1 or MPP 1012. In 1979, SERU completed an airborne EM and magnetic survey that covered the showing area (AF 74I-0014). A second EM, magnetic, and radiometric survey was completed in the same year (AF 74I-0018). In 1980, limited prospecting of radiometric anomalies failed to locate significant mineralization in the showing area (AF 74I-0019). MPP 1012 lapsed on 1 July 1983.
In 1983, C. Gilboy geologically mapped the sub-Athabasca basement at a scale of 1:250,000 for the Saskatchewan Geological Survey.
On 29 May 1985, Interuranium Canada Limited staked the showing area as CBS 3670. Between 1986 and 1987, a fixed-wing GEOTEM EM and magnetic survey was flown over the showing area (AF 74I-0042).
In 1988, a partnership involving Interuranium Canada (50%), Cogema Canada Ltd. (20%), Uranerz Exploration and Mining Ltd. (15%), and Cameco (15%) took over the property. Between 1987 and 1988, reconnaissance UTEM and lake sediment surveys were completed in the general showing area (AF 74I-0047). In the winter of 1989, the partnership completed a ground UTEM survey and four anomaly drill holes in the immediate showing area (AF 74I02-0040). Drill hole MJ-3 encountered the anomalous uranium mineralization that constitutes this showing.
Between 1989 and 1990, the partnership completed further UTEM surveys and anomaly drill holes MJ-5 and 6 (AF 74I-0045). The drill holes, which were completed to the east of and on the same conductor (MJ-1 conductor) as drill hole MJ-3 returned slightly elevated uranium values at the unconformity.
On 8 August 1990, Interuranium staked the showing as S-101334 within CBS 3670 and on 1 April 1991, CBS 3670 was allowed to lapse.
In 1996, Cogema Resources Inc completed a ground TDEM survey on the MJ grid to better locate the MJ-2 conductor which hosts this showing (AF 74I02-0052). In the following year, drill hole MJ-7 further test the MJ-1 conductor west of hole MJ-3, hole MJ-11 tested the conductor just east of the showing, and hole MJ-8 tested the conductor well east of the showing (AF 74I07-0010). In 2001, a partnership involving Cogema Resources, Camec, and UEM Inc. completed drill hole MJ-14 to test the showing conductor well to the west of the existing holes (AF 74I07-0011). The hole failed to intersect signifcant mineralization.
- Production History
- Reserves and/or Resources