Overview
Stage | Preliminary Economic Assessment |
Mine Type | In-Situ |
Commodities |
|
Mining Method |
|
Mine Life | 6 years (as of Jan 1, 2020) |
The PEA demonstrates robust economics for a small- scale Athabasca Basin ISR uranium mining project – including low initial capital costs, low operating costs and globally competitive all-in costs. |
Source:
p. 21,30
Company | Interest | Ownership |
Korea Waterbury Uranium Ltd.
|
32.99 %
|
Indirect
|
Denison Mines Corp.
|
67.01 %
|
Indirect
|
Denison Waterbury Corp.
(operator)
|
67.01 %
|
Indirect
|
Waterbury is owned by the Waterbury Lake Uranium Limited Partnership (“WLULP”), of which Denison Waterbury Corp. (a wholly-owned subsidiary of Denison) owns 67.01% and Korea Waterbury Lake Uranium Limited Partnership (“KWULP”) owns 32.99%.
Contractors
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Summary:
Tthe Heldeth Túé
The Tthe Heldeth Túé is primarily comprised by an east-west trending faulted package of variably graphitic and pyritic metasediments bounded by orthogneiss to both the north and south. The pelitic metasedimentary assemblage, which ranges in thickness from 90 to 120 m and is moderately steep dipping to the north includes, from north to south, a roughly 50 m thick pelitic gneiss underlain by 20 m thick graphitic pelitic gneiss, underlain by a 10 to 15 m thick quartz-feldspar wedge underlain by 20 m thick graphitic pelitic gneiss, underlain by a 15 to 25 m thick pelitic gneiss, then back into orthogneiss. There are discontinuous offsets at the unconformity that range from a few metres to as much as ten metres.
The Tthe Heldeth Túé deposit is currently defined by 268 drill holes intersecting uranium mineralization over a combined east-west strike length of up to 700 m and a maximum northsouth lateral width of 70 m. The deposit trends roughly east west (080°) in line with the metasedimentary corridor and cataclastic graphitic fault zone. A 45 m east-west intermittently mineralized zone occurs in the target area formerly known as Highland roughly separating the Tthe Heldeth Túé into two segments referred to as the eastern and western lenses which are defined over east-west strike lengths of 260 and 318 m, respectively. A thin zone of unconformity uranium mineralization occurs to the north of intermittently mineralized zone which is interpreted to re ........

Summary:
Mining recovery has been included in the mine plan and was determined from other typical ISR projects. These results were considered against benchmarked ISR operation recoveries within the context of comparing the grade distribution and geometry between the typical low-grade and dispersed roll front deposit benchmarked operations and the high-grade and concentrated Tthe Heldeth Túé deposit. Based on this analysis, an overall mining recovery factor of 85% has been applied against the in-situ resource to account for sweep efficiencies and metallurgical recovery envisioned and deemed appropriate for the nature of the Tthe Heldeth Túé deposit.
In an ISR operation, the mining solution is pumped through the underground deposit to dissolve the minerals. After dissolution, the solution (now referred to as the pregnant solution or UBS) is recovered and pumped to surface. Once on surface, the solution is transported to a processing plant and the uranium is recovered in much the same way as the final stages of processing in any other uranium mill. As a result of this mining approach, there is minimal surface disturbance, no tailings, and minimal waste rock generated.
Mining of Tthe Heldeth Túé is proposed using a wellfield of 184 wells at 7 m spacing arranged in a 5-spot pattern, with four injection wells around one recovery well. The ISR wells are planned to be drilled entirely from land on the peninsula on McMahon Lake which extends to the eastern portion of Tthe ........

Flow Sheet:
Summary:

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Projected Production:
Commodity | Units | Avg. Annual | LOM |
Uranium
|
M lbs
| 2.1 | 9.6 |
All production numbers are expressed as yellow cake.
Operational Metrics:
Metrics | |
Ore tonnes mined, LOM
| ......  |
* According to 2020 study.
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Reserves at October 17, 2018:
Reported at mineral resource cut-off grade of 0.10% U3O8
The mineral resource estimate for the Tthe Heldeth Túé deposit is unchanged from the September 6, 2013.
Category | Tonnage | Commodity | Grade | Contained Metal |
Indicated
|
291 kt
|
U3O8
|
2 %
|
12,810 k lbs
|
Inferred
|
268 kt
|
U3O8
|
0.96 %
|
5,687 k lbs
|
Corporate Filings & Presentations:
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