- SMDI #
- 1856
- Current Showing Name
- Cigar Lake Mine
- Historical Showing Names
- Cigar Lake Mine, Cigar Lake Uranium Mine
- Company Name
- Cameco Corporation, Orano Canada Inc., TEPCO Resources Inc.
- Project Name
- Cigar Lake
- UTM Easting (NAD83 Z13)
- 527220.0000
- UTM Northing (NAD83 Z13)
- 6436470.0000
- NTS Sheet
- 074I02
- TRM (Township-Range-Meridian)
- 104-16-2
- Primary Commodities
- Uranium
- Associated Commodities
- Cobalt, Copper, Lead, Nickel, Zinc
- Discovery Type
- Status
- Deposit: Production
- Geological Details
- The Waterbury Lake - Cigar Lake Uranium Deposit is located between the Rabbit Lake and Key Lake uranium mines. It is about 115 km (71.5 miles) northeast of Key Lake.
Surficially, the deposit area is covered by at least three generations of bouldery and sandy glacial till with small localized areas being covered by glaciofluvial and glaciolacustrine sediments. The till covers over 400 m (1312.3 ft) of underlying weakly fractured Athabasca Group Manitou Falls Formation fine- to coarse-grained sandstones with intercalated horizons of siltstone , grit, and conglomerate. The Manitou falls Formation has been further subdivided into a 230 m (754.6 ft) thick upper MF unit, a 140 m (459.3 ft) thick MFc unit, and a lower 50 m (164.0 ft) thick MFd unit. The M3 stratigraphic marker horizon is located 50 m (164.0 ft) above the unconformity. The Athabasca Group rocks exhibit bleaching and hematization, pervasive illitization and chloritization, tourmalinization, and extensive quartz dissolution that develops in a concentric pattern around the deposit. The alteration zone extends up to 300 m (984.3 ft) above the unconformity into Athabasca Group rocks.
The regolith is up to 40 m (131.2 ft) thick. The oxidized red zone (including the transition to the green zone) is 10 to 20 m (32.8 to 65.6 ft) thick. The reduced green zone is characterized by abundant chlorite, sericite, and clay minerals. In the vicinity of the ore zone, the paleoweathering profile is overprinted and obscured by the results of diagenetic hydrothermal alteration. There is a strong correlation between metal accumulation and the local topography of the unconformity.
The Athabasca Group unconformably overlies an over 500 m (1640.4 ft) thick succession of east-west striking and steeply south dipping (70° to 90°) Wollaston Domain basement rocks that consist, primarily, of pelitic to psammopelitic gneisses, graphitic pelites, dipositic calc-silicate gneisses, and minor meta-arkose. The pelites are porphyroblastic to granoblastic, very fine- to coarse-grained, well foliated, gneissic, and variably migmatitic. The upper biotite metapelite is at least 170 m (557.7 ft) thick, the central meta-arkose unit is 70 to 80 m (229.7 to 262.5 ft) thick, and the lower graphitic pelite is at least 250 m (820.2 ft) thick. The rocks in this succession contain 10% to 20% pegmatite and leucogranite. The basement rocks form a basement ridge over which the deposit drapes. At the deposit, the basement rocks are effected by a funnel-shaped zone of hydrothermal alteration that is over 200 m (656.2 ft) wide and that extends as much as 100 m (328.1 ft) below the deposit. The intensity and vertical depth of the alteration zone is generally proportional to the grade of the uranium ore at the unconformity.Alteration varies from weak to extreme depending on the local degree of ductile and brittle deformation. The alteration zone is characterized by strong chlorite and clay alteration. Pale yellowish to light green clay alteration occurs immediately below the ore.
The east striking Cigar Lake Structural Zone is a major reverse dextral Hudsonian protomylonitic shear zone with an unknown vertical offset.The fault is, overall, conformable with basement lithology and exhibits several pre-and post-Athabasca reactivation events. The zone exhibits both ductile and brittle deformation. Thee are two types of post-Athabasca faulting persent - a east-west striking and steeply dipping set of normal and, to some extent, reverse faults and a set of low angle east-west striking reverse faults. Late generation narrow steeply dipping fractures present trend 035°, 060°, 090°, 120°,140°,and 360°. A prominent basement ridge occurs at the deposit where the unconformity is cut by the Cigar Lake Structural zone. This post-Athabasca horst correlates directly with the highest grade portion of the orebody that is draped over the ridge. The M3 conglomerate structural marker indicates that there is a fault-generated collapse structure in the lower 50 m (164.0 ft) of the Athabasca Group located directly over the orebody. The volume of rock lost due to collapse (30 million tons) corresponds closely to the darea of development of massive clay and the orebody.
During the Seru Nuclear of Canada 1981 reconnaissance drilling program, hole WQS2-15 penetrated and discovered the deposit. In 1983, 65 holes delineation holes outlined the eastern part of an east-west trending mineralized uranium-bearing structure. All 65 holes intersected the orebody and seven holes hit sections with spectacular grades which are listed below.
LENGTH (metres) AVERAGE GRADE (% U3O8)
__________________________________________________
13.00 11.44
17.00 24.08
14.16 7.20
3.25 10.78
15.00 13.53
6.50 19.11
9.50 25.02
By 1986, 170 holes had delimited an orebody consisting of the East Zone, a flattened lens or pod and the mineralized ribbon-like West Zone
The 410 to 450 m (1,345.1 to 1,476.4 ft) deep deposit forms a continous, flat, elongated, east-trending body 2,150 m (1.3 mile) long, 25 m to 105 m (82.0 to 344.5 ft) wide and up to 40 m (131.2 ft) thick that occurs immediately above a high in the sub-Athabasca Group unconformity. The perched mineralization is found to 300 m (984.3 ft) above the unconformity and in veins in the underlying basement. The deposit is close to a major northeast-trending lineament and an east-west trending structural zone. The deposit is partially controlled by two distinct sets of faults.
The main uranium deposit is confined to the basal sandstone immediately above the unconformity. The uranium content, which may exceed 50% over several metres, is associated with As, Ni, Co, Cu, Mo, and Pb. The overall average grades of the deposit are:
U Cu Pb Zn Mo Ni Co As
_____________________________________________________
12.3% 0.7% 1.16% 0.04% 0.14% 0.96% 0.15% 1.67%
The mineralization, which is a result of polyphased hydrothermal processes, can be split into three distinct phases. Phase I contains uranium oxides of the uranninite facies followed by the deposition of arsenides, sulphides and sulfo-arsenides (pyrite, marcasite, bravoite, rammelsbergite, niccolite, gersdorffite, cobaltite, glaucodot). This consitiutes the bulk of the mineralization. Phase II mineralization is made up of oxides of pitchblende and associated copper sulphates (pitchblende, chalcopyrite, bornite, digenite, chalcocite, covellite, sphalerite, galena, jordisite). Phase III mineralzation consists of uranium silicates, oxides and hydroxides (pitchblende, coffinite). Earliest mineralization is dated 1300 Ma.
The orebody, which is capped by massive hematized clay, is surrounded by successive zones characterized by clay alteration, strong fracturing, euhedral quartz veining, disseminated iron sulphides and local hydrocarbons, and bleaching. In the basement, a 1 m to 3 m (3.3 to 9.8 ft) zone of total argillization directly underlies the orebody. The uranium mineralization occurs as three types dependant upon their relative location.
(1) Perched mineralization occurs along steeply dipping (70 to 90°) faults
within the sandstone. This style of mineralization is felt to
represent late stage remobilized unconformity ore. Perched ore is
made up of pitchblende, coffinite, marcasite, pyrite, bravolite and
rare galena.
(2) The second style of mineralization is the unconformity mineralization,
which makes up 95% by volume of the deposit. The main lens ore is
thickest and richest over the basement ridge. The constituents of this
style of mineralization are described above. The Eastern Pod or Main
pod is 650 m long and contains 285 million puunds U3O8 in ore grading
an average 12% U. This is surrounded by a pod of ore named the Western
Extension which is 2,000 m (6,561.7 ft) long by 25 to 105 m (82.0 to
344.5 ft) wide by 1 to 20 m (3.3 to 65.6 ft) thick. The Western
Expension contains 100 million pounds of U3O8 in ore with an average
grade of 4% U.
(3) Basement hosted ore is quite rare and of limited extent.
Uranium-lead age dating by Cogema Canada sets the time of main mineralization at between 1300 and 1800 m.y. and the perched mineralization approximately 300 m.y. The basement metasediments have been age dated at 1.75 g.y. and the regolith has been dated at between 1.57 and 1.63 g.y.
- Geological Domain
- Wollaston
- Host Rocks
- Host Minerals
- Indicators
- Exploration History
- 12/1/2023
A total of 19.23M lb (8723 t) tri-uranium octoxide (U3O8) was produced, the majority coming from the Cigar Lake (Cameco Corp.)–McClean Lake (Orano Canada Inc.) operation (Table 1), which accounted for 18.0M lb (8164.7 t) U3O8 (100 per cent basis) in 2022. Cameco forecasted a total production of 16.8M lb (7620.4 t) U3O8 in 2023, adjusting the 2022 number due to initiation of mining a new zone in the orebody and equipment reliability issues.
(Saskatchewan Exploration and Development Highlights 2023, p.7)
(See also Production and Reserves/Resources, from Saskatchewan Exploration and Development Highlights 2023, Tables 1 & 2, p.7-8)
12/1/2024
In 2024, due to increased production at the McArthur River mine, estimates indicate that Saskatchewan could produce an additional 4.0M lb of U3O8 , reaching 36.0M lb. Total 2024 production is estimated to be split equally between McArthur River and Cigar Lake mines, with each producing 18.0M lb.
(Saskatchewan Exploration and Development Highlights 2024, p.9)
(See also Production and Reserves/Resources, from Saskatchewan Exploration and Development Highlights 2024, Tables 2 & 3, p.7-9)
6/30/1988 The area around the deposit was first prospected and covered by Ranger Oil (Canada) Ltd. Permit No. 1 in 1969. The work done in the area by Ranger Oil includes photogeological interpretation, aeromagnetic interpretation, airborne scintrex spectrometer surveys and aerial and ground reconnaissance surveys. No anomalies were located. The permit was allowed to lapse in July, 1970.
In December of 1977, Asamera Oil Corporation Ltd. Acquired Permit No. 3 (later MPP 1011 and CBS 4663 to 4665), which covered the deposit. From 1977 to 1981 Asamera conducted a program of airborne EM and magnetic surveys and a followup program of ground EM and magnetic surveys, prospecting and lake sediment sampling (AF 74I02-0006).
In May of 1980 Permit No. 3 was transferred to Seru Nucleaire (Canada) Limitee. Seru (later Cogema Canada) commenced a program of lake sediment geochemistry and prospecting to fill in gaps in Asamera work and to confirm Asamera anomalies. High resolution airborne magnetic surveys and the re-interpretaion of Asamera airborne anomalies was followed up by ground EMR-16, DEEPEM, magnetic and radon-in-soil surveys over anomalous areas (AF 74I02-0008 to 0011). The systematic followup program of ground geophysics and reconnaissance drilling (AF 74I02-0012 to 0014) resulted in the discovery of the Cigar Deposit in 1981 (discovery hole WQS2-15).
From 1982 to 1985, Cogema Canada delineated and evaluated the Cigar Lake Deposit with zone and pre-development drilling. Metallogenic, chemical, economic and environmental baseline studies (AF 74I02-0026) were conducted and by 1983 reserves estimates, ore treatment tests, geotechnical tests, preliminary mining and engineering programs had commenced (AF 74I02-0015 to 0025, 0027 to 0029, 0034 to 0037).
In 1984, Cogema Canada completed petrographic, metallogenic and geochemical studies on the Cigar deposit (AF 74I02-0024). In 1986, Cogema Canada completed geological mapping, 16 zone drill holes, 38 geochemical drill holes and 18 exploration drill holes as well as an core petrographic study and ground DEEPEM, UTEM and seismic surveys over the deposit area (AF 74I02-0038). Metallogenic, petrographic, geochronologic studies were also carried out. Reserves were re-calculated in 1986. In 1987, Cogema completed environmental impact, water treatment, mine shaft, ore treatment and tailings storage studies (AF 74I02-0041). A test mining project received approval.
In 1988, Cameco commenced sinking of a shaft on the deposit and a water treatment plant was constructed. In 1990 the shaft reached a final depth of 510 metres (1,673.2 ft) and horizontal development of two levels (one above at 420 m (1,378 ft) and one below the orebody at 480 m (1575 ft)) commmenced. In the same year, a pilot shaft hole was completed along with minesite evaluations, ore treatment and waste water and rock studies, cost estimates and a test mine design (AF 764I02-0039). The 1989 Cameco annual report listed revised reserves figures for the deposit.
Between 1988 and 1991, Cameco (48.75%), Cogema Canada Ltd (38.375%), and Idemitsu (12.875%) completed mill tailings, ore treatment, road impact, environmental residue, fish spawning, hydrological, air quality, geological and geotechnical, limnological, and deposit structural interpretation studies on the deposit (AF 74I02-0044,-0047,-0048).
By May of 1990, a 510 m (1,673.2 ft) shaft had been sunk and the 420 m (1,378 ft) and 480 m (1,575 ft) levels had been developed. In October of 1991 Cigar Lake Mining used a Robbins 53RE remote controlled boring machine to extract the first high grade ore (average 14.7% U) from the 480 m (1,575 ft) level. The first test mining by remote control was considered successful. In November of 1991, freezing techniques were used to stabalize the ground at -10°C. Six vertical ore shoots were cut using the box-hole method with an expandable head on the boring machine. By February 1993 test mining using jet boring was completed. At this time, revised deposit reserves were published (The Prospect May 23, 1990, p4).
Between 1990 and 1991, eight development drill holes, test mining using the box-hole freezing method, a feasibility study of the jet boring mining method, and a fish population study of Waterbury Lake (AF 74I02-0049). In 1992, a further 27 delineation drill holes were completed (AF 74I02-0050).
In 1993, the partnership completed 25 drill holes and a series of feasibility and environmental impact studies (AF 74I02-0054). On February 24, 1993, Cigar Lake Mining re-calculated the deposit reserves. A news release by Cameco, on 12 October 1995 listed the total mineable reserves for the deposit. In 1994, they completed 6 drill holes, a surface test hole at shaft No. 2, a series of feasibility studies, and a plan for an access road for this the second largest high grade uranium mine in the world (AF 74I02-0055).
It was planned that Phase I of mining would remove the high grade portion of the eastern orebody which grades an average 26% U3O8. Phase II would remove the lower grade ore which averages 9% U3O8. The ore will be milled underground and pumped to surface as a slurry. Tailings will be stored underground or in the JEB tailings pit. Ore will be trucked 80 km (49.7 miles) to the McClean Lake uranium site for processing. Annual production is expected to be 18 million pounds U3O8.
In 1995, further technical and EIS studies were completed including work on hydrogeology, freezing studies, jet bore mining studies, and bulk leach tests (AF 74I02-0056). In the same year, further environmental and engineering studies, waste rock disposal studies, hoist, refrigeration, pipeline, jet bore tests, sediment sampling, and upgrading of the airstrip were completed (AF 74I02-0058).
In 1997, the partnership completed road access, evaluation drilling, grouting, communications, camp location,waste water and rock disposal environmental studies as well as an assessment of aggregate persent for use in concrete (AF 74I02-0062). On 13 November 1997, Cameco announced that the Cigar Lake Mine Project had received joint Federal-Provincial approval to proceed with development of the orebody subject to environmentally acceptable disposal of the waste rock. The ore will be processed at the McClean Lake mill and tailings will be stored in the JEB open pit tailings facility - a two stage natural surround type of storage facility.
In 2000, Cigar Lake Mining Corporation [Cameco (50,025%)-Cogema (37.100%)-Idemitsu Uranium (7.875%)-Tepco (5.0%)] agreed that phase 1 ore (the leaner eastern portion of the orebody) will be mined over an eleven year period and ore will be processed 57% at the Rabbit Lake Mill and 43% at the McClean Lake Mill. Phase 2 ore (high grade ore) will be mined starting in 2002 or 2003. Waste will be placed in the Sue C pit once it is mined out.
In Saskatchewan Energy and Mines Exploration and Development Highlights 2000, revised reserves calculations were reported for the deposit.
Construction of the mine site was initiated in July 2002 following successful Phase I licensing. On 7 February 2002, the deposit was re-staked as ML 5521. In 2002, a partnership involving Cogema, Cameco, Idemitsu, Tepco, and Korea Power completed a series of environmental studies that included JEB Mill expansion tests, sediment sampling, geochemical sampling, crusher testing, backfill cement mix tests, rock density/ compression tests, a water treatment plant review, shaft design studies, and upgrading of the access road (AF 74I02-0066). In the same year, the partnership completed ground TDEM, IP/Resistivity, UTEM, and GPS surveys over the showing grid (AF 74I02-SE-0068).
In 2003, site preparation work continued. The collar for the Number 2 Shaft was partly completed and the foundation for the headframe and hoist room was poured.
On 19 December 2004, Cameco announced that the Canadian Nuclear Safety Commission had issued a licence to allow the construction of the main underground mining works and surface support facilities at Cigar Lake. In the December 31 Northern Miner (p6), Cameco announced that they were proceeding with open pit and underground construction. Production startup in envisioned for 2007. Ore will be trucked to McLean Mill for initial processing then to the Rabbit Lake mill for final processing. Underground waste rock will be disposed of in the Sue C pit. Mine life is estimated at 30 to 40 years. There was no mine production in 2004. In December 2004, CNSC granted a full construction license.
In 2005, full mine construction commenced with a goal of commencing production in 2007.
On 8 April 2006, Cameco reported water flooding in the shaft area of the mine. A leaky valve, that sealed a drill hole, broke while being tightened. Water entered the bottom of the shaft - Cameco decided to allow the water to fill to "natural levels" in the shaft before solving the problem. As the shaft was sunk outside the ore zone area, the production area will not be flooded. This problem could delay the start of production up to 6 months.
On 6 April 2006, Cameco announced that, starting at 5:00 p.m. on 5 April 2006, a valve, that prevented water from entering the mine site from a drill hole, developed a leak. Cameco allowed the water to reach natural levels in the Shaft #2 (ventelation shaft) after all equipment was removed from the area. The area around the flooded shaft was frozen and the water was pumped out. Cameco estimated that this inflow could delay production startup by 6 months to late 2007.
In the 23 October 2006 Regina Leader Post newspaper, Cameco announced that, at 1:10 p.m. on 22 October 2006, the Cigar Lake Uranium Mine had experienced a major flood following a rock fall. A portion of the underground development area was allowed to fill with water. Closing bulkhead doors, which restricted water inflow to within the future mining area, protected main Shaft #1, the future processing area, the pumps refuge station, and the freezing system heat exchanger area. It is estimated, at this time, that startup date of production could be offset by up to 1 year. The flooding is not expected to impact the reserves. Later in the day, Cameco announced that the closing of bulkhead doors was not successful in stemming the flood of water into Cigar Mine, as the doors did not seal properly, and all staff were evacuated from the mine. All underground areas, initially, were expected to be filled with water. Cameco proceeded to restore access to the mine using, initially, surface drilling and grouting. A new production timetable will be assessed after remediation plans are developed.
- Production History
- Production Period: 2023-01-01 to 2023-12-31
Cameco Corporation:
18,000,000.00 lb
Production Period: 2022-01-01 to 2022-12-31
Cameco Corporation:
18,000,000.00 lb
Summary:
- Uranium
Production Period: 2015-05-01 to 2015-12-31
Commercial production began in May, 2015 with 11.3 M lb U3O8 produced. Full production is expected by 2017 with 18 M lb U3O8 per year produced.
Summary:
- Uranium: 11,300,000.00 lb
Production Period: 2014-01-01 to 2014-12-31
Production was initiated in 2014 with test mining of 0.34 million (M) lb U3O8 produced.
Summary:
- Uranium: 340,000.00 lb
Production Period: 1991-10-01 to 1993-02-01
Cameco Corporation:
166.00 tonnes
In 1988, Cameco commenced shaft sinking. By 1991, the shaft had reached 510 m (1673.2 ft) Between October of 1991 and February of 1993, Cigar Lake Mining completed test remote mining on the deposit. Test jet bore mining recovered 113 tonnes of ore which graded 15.6% U3O8. Test box-hole mining recovered 53 tonnes of ore which graded 17.8% U3O8.
Summary:
- Uranium @ 15.60 %
- Uranium @ 17.80 %
- Reserves and/or Resources
- 2024-12-01
Summary:
Cigar Lake: Proven and Probable Mineral Reserve
- Uranium: 208,600,000.00 lb @ 17.03 %
Cigar Lake: Inferred Mineral Resource
- Uranium: 20,000,000.00 lb @ 5.55 %
Cigar Lake: Measured and Indicated Mineral Resource
- Uranium: 27,000,000.00 lb @ 5.33 %
2023-12-01
Summary:
Cigar Lake: Measured and Indicated Mineral Resource of 105,300,000.00 lb
- Uranium @ 14.28 %
Cigar Lake: Proven and Probable Mineral Reserve of 154,800,000.00 lb
- Uranium @ 17.21 %
Cigar Lake: Inferred Mineral Resource of 22,100,000.00 lb
- Uranium @ 5.62 %
2021-12-31
Summary:
Cigar Lake: Proven Mineral Reserve of 271,000.00 tonne
- Uranium: 95,000,000.00 lb @ 15.9 %
Cigar Lake: Inferred Mineral Resource of 186,400.00 tonne
- Uranium: 22,900,000.00 lb @ 5.58 %
Cigar Lake: Probable Mineral Reserve of 177,500.00 tonne
- Uranium: 57,400,000.00 lb @ 14.67 %
Cigar Lake: Indicated Mineral Resource of 313,300.00 tonne
- Uranium: 99,300,000.00 lb @ 14.37 %
Cigar Lake: Measured Mineral Resource of 26,800.00 tonne
- Uranium: 4,500,000.00 lb @ 7.55 %
2015-01-01
As of 2015 the NI 43-101-compliant Reserves were 598,500 tonnes grading 17.84% U3O8 for 234.9 M lb U3O8, Measured and Indicated Resources were 24,300 tonnes grading 8.79% U3O8 for 4.7 M lb U3O8, and Inferred Resource of 294,250 tonnes grading 16.22% U3O8 for 105.0 M lb U3O8.
Summary:
Proven and Probable Mineral Reserve of 598,500.00 tonne
- Uranium: 234,900,000.00 lb @ 17.84 %
Measured and Indicated Mineral Resource of 24,300.00 tonne
- Uranium: 4,700,000.00 lb @ 8.79 %
Inferred Mineral Resource of 294,250.00 tonne
- Uranium: 105,000,000.00 lb @ 16.22 %
2005-01-01
Reserves of 231.5 M lbs U3O8 grading 19.06% U3O8. Mineable resource of 118.2 M lbs U3O8 grading 16.92% U3O8.
Summary:
Historic reserve (unspecified)
- Uranium: 231,500,000.00 lb @ 19.06 %
Mineable resource: Historic reserve (unspecified)
- Uranium: 118,200,000.00 lb @ 16.92 %
2001-12-31
231.6 million lbs U3O8 (89,100 tonnes U) with an average grade of 18.2% U3O8.
Summary:
Historic reserve (unspecified)
- Uranium: 231,600,000.00 lb @ 18.2 %
2000-11-24
142,320 t U (370 million lbs U3O8) at an average grade of 11.5% U (13.6% U3O8).
Summary:
Historic reserve (unspecified)
- Uranium: 370,000,000.00 lb @ 13.6 %
1995-10-12
Total mineable reserves: 353 million lbs with an average grade of 14% U3O8.
Summary:
Historic reserve (unspecified)
- Uranium: 353,000,000.00 lb @ 14 %
1993-02-24
Mineable reserves: 1,888,000 tonnes of ore grading 9.25% U3O8 (385,000,000 lbs U3O8).
Summary:
Historic reserve (unspecified) of 1,888,000.00 tonne
- Uranium: 385,000,000.00 lb @ 9.25 %
1993-02-01
385 million pounds U3O8 with an average grade of 9.04% U3O8.
Summary:
Historic reserve (unspecified)
- Uranium: 385,000,000.00 lb @ 9.04 %
1990-05-23
385 million pounds U3O8 at an average grade of 9.04% uranium. This includes 285 million pounds U3O8 grading 14.0% U.
Summary:
Historic reserve (unspecified)
- Uranium: 385,000,000.00 lb @ 9.04 %
1989-01-01
Cigar deposit reserves: 385 million lbs U3O8 including an area with 285 million pounds U3O8 with an average grade of 14.8 U.
Summary:
Historic resource (unspecified)
- Uranium: 385,000,000.00 lb @ 14.8 %
1986-01-01
Drill delineated reserve of East Zone: 110,000 t U grading 12.3 % U3O8.
Drill delineated reserve of West Zone: 40,000 t U grading 4.0% U3O8.
Summary:
East Zone: Historic reserve (unspecified)
- Uranium: 110,000.00 tonne @ 12.3 %
West Zone: Historic reserve (unspecified)
- Uranium: 40,000.00 tonne @ 4 %
1983-01-01
Drill outlined reserves: 125 million lbs U3O8 (48,260 tons U) for the eastern part of the deposit.
Summary:
Historic reserve (unspecified)
- Uranium: 125,000,000.00 lb