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INTEREST IN OTHER ENTITIES (Details) | 12 Months Ended
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Dec. 31, 2018
Waterbury Lake Uranium Corp |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesAndJointArrangementsLineItems [Line Items] |  |
Place of business, joint operations | Canada |
Entity type | JO-1 | [1]
Ownership interest, joint operations | 60.00% | [2]
Participating interest | 100.00% | [3]
Accounting method | Voting Share | [4]
Waterbury Lake Uranium LP |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesAndJointArrangementsLineItems [Line Items] |  |
Place of business, joint operations | Canada |
Entity type | JO-1 | [1]
Ownership interest, joint operations | 65.92% | [2]
Participating interest | 100.00% | [3]
Accounting method | Voting Share | [4]
McClean Joint Venture Agreement |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesAndJointArrangementsLineItems [Line Items] |  |
Place of business, joint operations | Canada |
Entity type | JO-2 | [1]
Ownership interest, joint operations | 22.50% | [2]
Participating interest | 22.50% | [3]
Accounting method | Proportionate Share | [4]
Midwest Joint Venture Agreement |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesAndJointArrangementsLineItems [Line Items] |  |
Place of business, joint operations | Canada |
Entity type | JO-2 | [1]
Ownership interest, joint operations | 25.17% | [2]
Participating interest | 25.17% | [3]
Accounting method | Proportionate Share | [4]
Wheeler River |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesAndJointArrangementsLineItems [Line Items] |  |
Place of business, joint operations | Canada |
Entity type | JO-2 | [1]
Ownership interest, joint operations | 90.00% | [2]
Participating interest | 75.85% | [3]
Accounting method | Proportionate Share | [4]
Mann Lake |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesAndJointArrangementsLineItems [Line Items] |  |
Place of business, joint operations | Canada |
Entity type | JO-2 | [1]
Ownership interest, joint operations | 30.00% | [2]
Participating interest | 30.00% | [3]
Accounting method | Proportionate Share | [4]
Wolly |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesAndJointArrangementsLineItems [Line Items] |  |
Place of business, joint operations | Canada |
Entity type | JO-2 | [1]
Ownership interest, joint operations | 21.89% | [2]
Participating interest | 0.00% | [3]
Accounting method | Proportionate Share | [4]
GoviEx Uranium Inc. |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesAndJointArrangementsLineItems [Line Items] |  |
Place of business, associates | Africa |
Ownership interest, associates | 16.21% | [2]
Participating interest |  | [3]
Accounting method | Equity Method | [4]
Denison Mines Inc. |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesAndJointArrangementsLineItems [Line Items] |  |
Place of business, subsidiaries | Canada |
Ownership interest, subsidiaries | 100.00% | [2]
Participating interest |  | [3]
Accounting method | Consolidation | [4]
Denison AB Holdings Corp. |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesAndJointArrangementsLineItems [Line Items] |  |
Place of business, subsidiaries | Canada |
Ownership interest, subsidiaries | 100.00% | [2]
Participating interest |  | [3]
Accounting method | Consolidation | [4]
Denison Waterbury Corp |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesAndJointArrangementsLineItems [Line Items] |  |
Place of business, subsidiaries | Canada |
Ownership interest, subsidiaries | 100.00% | [2]
Participating interest |  | [3]
Accounting method | Consolidation | [4]
9373721 Canada Inc. |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesAndJointArrangementsLineItems [Line Items] |  |
Place of business, subsidiaries | Canada |
Ownership interest, subsidiaries | 100.00% | [2]
Participating interest |  | [3]
Accounting method | Consolidation | [4]
Denison Mines (Bermuda) I Ltd |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesAndJointArrangementsLineItems [Line Items] |  |
Place of business, subsidiaries | Bermuda |
Ownership interest, subsidiaries | 100.00% | [2]
Participating interest |  | [3]
Accounting method | Consolidation | [4]
[1] | Joint operations are further subdivided into the following two entity types: JO-1=Joint Operations having joint control as defined by IFRS 11; and JO-2=Joint Operations not having joint control and beyond the scope of IFRS 11.
[2] | Ownership Interest represents Denison's percentage ownership / voting interest in the entity or contractual arrangement.
[3] | Participating interest represents Denison's percentage funding contribution to the particular joint operation arrangement. This percentage can differ from voting interest in instances where other parties to the arrangement have carried interests in the arrangement and / or are earning-in or diluting their voting interest in the arrangement.
[4] | Voting share or proportionate share is where Denison accounts for its share of assets, liabilities, revenues and expenses of the arrangement in relation to its ownership interest or participating interest, respectively.

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