- SMDI #
- 1264
- Current Showing Name
- Nicholson Mine [Nicholson Zones 1 to 6]
- Historical Showing Names
- Nicholson Mine [Nicholson Zones 1 to 6]
- Company Name
- Eldor Resources Limited
- Project Name
- UTM Easting (NAD83 Z13)
- 305144.6000
- UTM Northing (NAD83 Z13)
- 6596397.0800
- NTS Sheet
- 074N08
- TRM (Township-Range-Meridian)
- 120-15-3
- Primary Commodities
- Uranium
- Associated Commodities
- Cobalt, Copper, Gold, Lead, Nickel, Selenium, Silver, Vanadium, Zinc
- Discovery Type
- Status
- Deposit: Post-Production
- Geological Details
- The deposit is located 10 miles (16.1 km) southeast of the town of Uranium City on the shore of Lake Athabasca.
The area underlying these showings is a bedded sequence of dolomite, dolomitic quartzite, ferruginous quartzite, and mica schist. All are intruded by gabbroic sills and dykes (which are now amphibolite). Four mineralized zones of importance and 2 minor zones of less importance have been recognized and described below. These are fracture and vein-type deposits which have been carbonated and have a variety of different minerals associated with the pitchblende. The mineralization, at this deposit, occurs in 4 main zones and two sub-zones.
Nicholson Bay Zone 1 occurs on the east side of the property near the west shore of Ann Lake, a small lake which lies due east of Nicholson Bay. Zone 1 is a discontinous vein-type deposit located on the sheared contact between iron-rich quartzite and dolomitic quartzite-breccia. The zone is exposed over a strike length of 200 ft (60.96 m) in a series of 7 trenches. The vein strikes 296° and dips 45°NE. The zone has a maximum width of 1 inch (2.54 cm) and consists of carbonate, pitchblende, chalcopyrite, niccolite, cobalt-nickel and arsenides (eg Rammelsbergite), secondary cobalt and nickel minerals, annabergite and thucolite). Gold has been reported. The zone has been tested by 7 shallow drill holes with inconclusive results. The results obtained from a prospect shaft sunk to explore the zone are unknown.
Nicholson Bay Zone 1 extension was detected under overburden approximately 1500 ft (457.2 m) north northwest of Zone 1. Stripping revealed a radioactive zone at the contact of quartzite and iron-rich quartzite. The zone has a strike length of 25 (7.6 m) and is open at both ends. Secondary uranium minerals occur over a maximum width of 8 feet Sampling has indicated significant uranium, gold and silver values and traces of platinum and palladium over 6 feet (1.8 m). Exploration includes 2 drill holes (451 feet).
Nicholson Bay Zone 2, which occurs approximately 200 ft (60.96 m) east of the head of Nicholson Lake, consists of several en echelon fractures and shears in quartzite close to its contact with a iron-rich quartzite-breccia. The vertically dipping, north trending zone has a maximum strike length of 180 ft (54.9 ft). Zone 2 consists of a soft mud-like gouge carbonate-rich material mineralized with pitchbelnde, specularite, chalcopyrite, pyrite, galena, niccolite, nickel-cobalt arsenides, native silver and gold, tiemanite (HgSe) and dyscrasite (Ag3, Sb). High platinum values have been reported. Lateral development at the 100 foot level (30.5 m level) has revealed a few highly radioactive sections but, in general, results have not been encouraging.
Nicholson Bay Zone 3 (the first minor zone) is located approximately 600 feet (182.9 m) north of the head of Nicholson Bay. Trenching has revealed a small mineralized lens in dolomite near a contact with amphibolite. The mineralization consists of pitchblende, bornite, chalcocite, marcasite and pyrite in a gangue of carbonate, quartz and chlorite. Native silver has been reported.
Nicholson Bay Zone 4 is located approximately 1,600 (487.7 m) northwest of the north end of Nicholson Bay. This 1,100 foot (335.3 m) long zone consists of several irregular, sub-parallel veins forming a zone that strikes N30°W and dips from vertical to 80°NE. The zone intersects dipping beds of quartzite, dolomitic quartzite and dolomite and lies from 50 to 100 feet (15.2 to 30.5 m) west of and roughly parallel to a contact between dolomitic quartzite and iron-rich quartzite breccia. Individual veins within the zone pinch and swell and ore shoots tend to be wider where the wall rock is dolomitic. Vein constituents are roughly banded and vuggy in the upper part of the deposit, but more massive below the 200 foot level (61.0 m level). The veins contain niccolite, cobalt-nickel arsenides, chalcopyrite, pyrite, galena, sphalerite, pitchblende, thucolite, and hisingerite [Fe2(Si2O5)3(OH)4.2H2O]. The main gangue minerals are dolomite, calcite, quartz and chlorite.
On the first level of the Zone 4 Mine, there is a 245 ft (74.7 m) long and 3.8 ft (1.2 m) wide ore shoot. On the second level, one ore shoot graded 0.4% U3O8 across 6 ft (1.8 m) for a length of 90 ft (27.4 m). Lateral development along a third level, at the presumed downward extension of this zone, did not encounter mineralization of economic interest.
Nicholson Bay Zone 6 (the second minor zone) is located 300 feet (91.4 m) north of Ann Lake. Previous exploration on this zone included one small trench. Strong mineralization occurs at the intersection of several discontinous fractures over a strike length of 12 ft (3.7 m). A chip sample assayed 0.068% U3O8, 0.10 oz/ton Ag and trace amounts of platinum and 0.09% vanadium.
More recent drilling to test the zones for Pt, Pd and Au encountered the following intersections:
DRILLHOLE ZONE INTERSECTION WIDTH PPB PPB PPB GEOLOGY
NUMBER NUMBER (M) (M) PD PT AU
_____________________________________________________________________________
FH-87-39 2 17.5 - 18.5 1.0 34 17 424 quartzite
2 21.6 - 23.2 1.6 62 68 432 qte./ dolomite
2 23.2 - 24.8 1.6 133 59 223 qte./ dolomite
2 26.0 - 27.5 1.5 110 34 1009 dolomite
2 27.5 - 28.6 1.1 198 57 2680 dolomite
2 30.7 - 32.2 1.5 62 33 355 dolomite
2 33.9 - 35.7 1.8 153 138 592 quartzite
2 35.7 - 37.2 1.5 91 71 474 quartzite
2 38.7 - 40.2 1.5 537 162 4240 quartzite
2 40.2 - 41.8 1.6 367 230 1094 quartzite
FH-87-41 2 25.0 - 26.5 1.5 59 15 530 amphibolite
2 41.8 - 43.3 1.5 10 15 202 amphibolite
2 43.3 - 44.4 1.1 14 15 279 amphibolite
FH-87-41 2 81.4 - 82.9 1.5 2 15 211 dolomite
FH-87-35 4 47.5 - 48.8 1.3 16 15 133 calc-silicate
FH-87-38A 4 98.1 - 101.8 3.7 5 29 328 dolomite
FH-87-39 4 17.5 - 18.5 1.0 34 17 424 quartzite
4 26.0 - 27.5 1.5 110 34 1009 dolomite
4 27.5 - 28.6 1.6 198 57 2680 dolomite
4 30.7 - 32.2 1.5 62 33 355 dolomite
4 33.9 - 35.7 1.8 153 138 592 quartzite
4 35.7 - 37.2 1.5 91 71 474 quartzite
4 38.7 - 40.2 1.5 537 162 4240 quartzite
4 40.2 - 41.8 1.6 367 230 1094 quartzite
4 46.3 - 47.9 1.6 199 98 331 quartzite
4 60.1 - 61.6 1.5 23 22 313 dolomite
MCD87-7 2 16.7 - 17.1 0.4 -- -- 840 "Red Zone"
MCD87-8 2 29.5 - 30.1 0.6 -- -- 719 carbonate
2 35.1 - 35.7 0.6 -- -- 1240 carbonate
MCD87-9 2 22.5 - 23.0 0.5 120 50 1522 sheared dolomite
2 43.4 - 43.8 0.4 105 15 2020 "Red Zone"
2 44.5 - 44.9 0.5 350 15 5400 "Red Zone"
2 44.9 - 45.3 0.4 400 15 4400 "Red Zone"
2 45.3 - 45.7 0.4 240 80 7000 "Red Zone"
MCD88-11 2 37.7 - 38.1 0.4 1100 300 3.33 o/t dolomite
2 38.2 - 38.7 0.5 1400 100 0.33 o/t dolomite
2 38.7 - 39.2 0.5 260 50 9150 dolomite
2 71.4 - 72.0 0.6 170 150 8950 diopside vein
MCD88-12 2 36.1 - 36.6 0.5 90 <20 1480 diopsidic dol.
2 36.7 - 37.1 0.6 110 <20 1070 diopsidic dol.
MCD88-14 1 31.8 - 32.4 0.6 300 150 1495 diopsidic
1 32.3 - 32.8 0.5 370 250 2915 diopsidic
1 32.8 - 33.3 0.5 240 125 6410 diopsidic
MCD88-18 6 35.3 - 36.1 0.8 <10 <20 0.82 o/t coarse diopside
6 40.0 - 40.7 0.7 <10 <20 1072 coarse diposide
6 45.6 - 46.2 0.6 <10 <20 7200 coarse diopside
6 51.7 - 52.5 0.8 <10 <20 1680 dolomite
6 52.5 - 53.3 0.8 <10 <20 5700 dolomite
- Geological Domain
- Beaverlodge
- Host Rocks
- Host Minerals
- Indicators
- Exploration History
- 7/27/1989 The Nicholson Property, originally consisting of FLO, JIM, IVEY, DOROTHY, PETER, MARGARET, APEX, and STORM claims, is on the north shore of Lake Athabasca approx. 10 miles (16.1 km) southeast of Uranium City and east of the town of Goldfields. The property is said to have been first staked for iron in 1920 and in 1929 restaked, and explored in 1930 for its base metal potential. In 1935 it was prospected for its gold possibilities and the zone, now known as the Nicholson Bay No.4 Zone was explored by two adits with a total of 350 feet (106.7 m) of underground workings. In the course of this work uranium stain and pitchblende were discovered, marking the first uranium discovery in the Beaverlodge area.
Shortly afterward the work was suspended and the property lay dormant until 1949. In 1949, prospecting, trenching, and 15 drill holes were completed to re-assess the economic potential of the pitchblende in Zone 4. Prospecting and follow-up diamond drilling (26 holes) were carried out on the other zones at the same time. A shaft, with lateral development on the 100 and 200 foot levels, was sunk to 232 ft (70.7 m) on Zone 4. A shaft (135 ft or 41.1 m) and 562 feet of lateral development on the 100 foot level was completed on Zone 2 and a 60' deep prospect shaft was completed on the Zone 1 extension. Results were not encouraging and subsequent work was carried out on Zone 4.
To the end of 1950, further lateral work was completed on Zone 4 on the first (1,530 ft) and second levels (1,340 ft). In 1951, the shaft was deepened to 325 feet (99.1 m) and some lateral development work was done on the third level. When this work did not find the downward extension of the ore zone, all development work was stopped. The same year Nicholson Mines was reorganized and named Consolidated Nicholson Mines Ltd.
In 1954, Consolidated Nicholson Mines Ltd. contracted the sale of its ore to the Eldorado Mining and Refinement Ltd. mill. Work resumed in 1955 and stoping was carried out on the first and second levels of the No. 4 shaft. In 1955, 1,114' of diamond drilling was completed on Zone 1. The results were not encouraging.
In 1956, the contract with the Eldorado mill expired. Eldorado's offer to buy 2,000 tons of ore at a price 1/3 less than the contract price was rejected. Mining operations ceased, the mine was closed and, the mine plant was sold. Between 1955 and the middle of 1956, ore was shipped to the Eldorado mill for custom processing.
Between 1958 and 1959, KLK Mining Company highgraded the deposit above the lower adit level. The property was then allowed to lapse.
In 1965, J. McDonald staked the property as the MC claims nos. 1 to 6. In 1967, Enex Mines Ltd. took over a working option on the claims and completed geological and scintillometer surveys in the early part of 1969. They had exclusive exploration rights until 1973. In the latter part of 1973, Enex Mines completed soil-gas sampling and a bog sample survey on MC claims 3 and 4. In 1970, Consolidated Nicholson Mines Ltd. completed work on that portion of the Nicholson Bay property covered by ML 4760 to ML 4762. This is known as developed area No. 1. The work consisted of clearing, mapping, sampling and radiometric surveys over Zone 1, Zone 1 extension and Zone 6.
In 1975, the MC claims were converted to ML 5131 with J McDonald still holding the lease title. In 1975, Enex Resources again optioned the property. Enex completed 8 drill holes (2,025 feet) to test Zone 4, the main vein, the east contact between iron-rich quartzite and dolomitic quartzite and areas of anomalous bog samples. No mineralization was encountered during the drilling.
Auric Resources (formerly Consolidated Nicholson Mines) scheduled exploration on the Nicholson Bay property in May, 1977. The exploration, which will include EM and magnetic surveys, a follow-up radon detection survey and possible diamond drilling is targeted to look for uranium deposits along a 2,000 foot (609.6 m) long overburden covered fault that extends through zones 1 and 2. The program will also search for extensions to Zone 2.
Between 1987 and 1988, a Eldor Resources (60%) - Mary Ellen Resources (40%) took control of CBS 8204 and NIC claims 1 to 5 (these dispositions covered the minesite). The property was geologically mapped and sampled and 9 drill holes were completed (AF 74N08-0139). Drill results are given above. Between 1987 and 1988, Chancellor Energy Resources Ltd (50%) and SMDC (50%), under an option from Mary Ellen Resources, completed 26 drill holes (MC87-1 to -9, MC88-10 to -26), radiometrically logged the "Red Zone" (a series of hematized carbonatized calc-silicate diopside rocks), trenched and sampled the 1, 2, and 6 zones, and completed a ground magnetic survey over the 2 Zone (AF 74N08-0049).
In 1997, Greater Lenora Resources flew an airborne EM, magnetic, and spectrometer survey over the deposit (AF 74N-0007).
- Production History
- Production Period: 1958-01-01 to 1959-12-31
2,000.00 tons
The mine workings consist of shaft no. 1 (6594014N, 645295E), two adits on Zone 4 (adjacent to shaft No. 1), shaft no. 2 (6953957N, 645737E), and shaft no. 3 (6593647N, 646239E) located 760 m (2493.4 ft) east of shaft 1.
In 1935, 2 adits and underground lateral work (350 ft or 160.7 m) were completed on the Zone 4.
In 1950, a 232 ft (70.1 m) shaft and lateral work was completed on Zone 4 and a 135 ft (41.4 m) shaft and 562 ft (171.3 m) of lateral work was completed on Zone 2. In 1951, the Zone 4 shaft was deepened to 325 ft (99.1 m). Results were not encouraging. In 1955, stoping was carried out on Zone 4 and ore was shipped to the Eldorado Mill. Results, again, were not encouraging. In 1956, a new contract for processing ore could not be negotiated so the mining operations ceased and the mine was closed.
Between 1958 and 1959, KLK Mining Company highgraded the deposit above the lower level and 2,000 tons of ore with an average grade of 0.5% U3O8 was removed. Numbers on this record include 1958 to 1959.
Summary:
- Uranium @ 0.50 %
Production Period: 1955-01-01 to 1956-12-31
12,000.00 tons
Between 1955 and 1956, Eldorado Mill processed 12,000 tons of ore with an average grade of 0.304% U3O8. Numbers on this record include 1955-1956.
Summary:
- Uranium @ 0.30 %
- Reserves and/or Resources
- 1950-01-01
Zone 4:
Consol. first level: a 245' long by 3.8' wide ore shoot that grades 0.38% U3O8 and 0.23 oz/ton Au.
Second level: a 90' long by 6.0' wide ore shoot that grades 0.4% U3O8.
Summary:
Zone 4- Second level: Historic reserve (unspecified)
- Uranium @ 0.4 %
Zone 4- First level: Historic reserve (unspecified)
- Uranium @ 0.23 oz/ton
- Uranium @ 0.38 %