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ACQUISITIONS AND DISPOSITIONS - Disposition (Details) $ in Millions, $ in Millions |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 03, 2017 CAD ($) | Nov. 03, 2017 USD ($) | Sep. 18, 2017 | Jun. 14, 2017 CAD ($) payment shares | Jun. 14, 2017 USD ($) payment shares | Jun. 09, 2017 USD ($) | May 18, 2017 | Mar. 28, 2017 | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 shares
Disposition of interest |  |  |  |  |  |  |  |  |  |
Gross cash proceeds |  |  |  |  |  | $ 260.0 |  |  | $ 269.6 |
Number of shares issued of buyer | shares |  |  |  |  |  |  |  |  | 1,247,003,940 | 1,245,049,712
Number of shares outstanding | shares |  |  |  |  |  |  |  |  | 1,247,003,940 | 1,245,049,712
Reversal of impairment charges |  |  |  |  |  |  |  |  | $ 97.0 |
Gain (loss) on disposition |  |  |  |  |  |  |  |  | 55.2 |
Cerro Casale |  |  |  |  |  |  |  |  |  |
Disposition of interest |  |  |  |  |  |  |  |  |  |
Percentage of interest sold |  |  |  |  |  |  |  | 25.00% |  |
Contingent payment |  |  |  |  |  | 40.0 |  |  |  |
Contingent payable obligation to Barrick Gold Corporation |  |  |  |  |  | $ (20.0) |  |  |  |
The percentage of royalty calculated on 25% of gross revenues |  |  |  |  |  | 1.25% |  |  |  |
Percentage of gross revenues subject to royalty payments |  |  |  |  |  | 25.00% |  |  |  |
First foregoing amount of royalty |  |  |  |  |  | $ 10.0 |  |  |  |
Reversal of impairment charges |  |  |  |  |  |  |  |  | 97.0 |
Gain (loss) on disposition |  |  |  |  |  | 12.7 |  |  | 12.7 |
Quebrada Seca exploration project |  |  |  |  |  |  |  |  |  |
Disposition of interest |  |  |  |  |  |  |  |  |  |
Percentage of interest sold |  |  |  |  |  |  |  | 100.00% |  |
Gross cash proceeds |  |  |  |  |  | $ 20.0 |  |  |  |
White Gold |  |  |  |  |  |  |  |  |  |
Disposition of interest |  |  |  |  |  |  |  |  |  |
Percentage of interest sold |  |  |  |  |  |  | 100.00% |  |  |
Gross cash proceeds |  |  |  | $ 10.0 | $ 7.6 |  |  |  |  |
Number of shares issued of buyer | shares |  |  |  | 17,500,000 | 17,500,000 |  |  |  |  |
Percentage of issued and outstanding shares of buyer |  |  |  | 19.90% | 19.90% |  |  |  |  |
Deferred payments |  |  |  | $ 15.0 | $ 11.4 |  |  |  |  |
Number of equal instalments | payment |  |  |  | 3 | 3 |  |  |  |  |
Equal instalment deferred payment |  |  |  | $ 5.0 | $ 3.8 |  |  |  |  |
Loss on disposition of investment |  |  |  |  | $ 1.7 |  |  |  | 1.7 |
DeLamar |  |  |  |  |  |  |  |  |  |
Disposition of interest |  |  |  |  |  |  |  |  |  |
Percentage of interest sold |  |  | 100.00% |  |  |  |  |  |  |
Duration of non-interest bearing promissory note | 18 months | 18 months |  |  |  |  |  |  |  |
Cash proceeds and non-interest bearing promissory note | $ 7.2 | $ 5.6 |  |  |  |  |  |  |  |
Percentage of issued and outstanding shares of buyer | 9.90% | 9.90% |  |  |  |  |  |  |  |
Net smelter return royalty | 2.50% | 2.50% |  |  |  |  |  |  |  |
Reduced net smelter return royalty | 1.00% | 1.00% |  |  |  |  |  |  |  |
Accumulated royalty payments | $ 10.0 | $ 7.8 |  |  |  |  |  |  |  |
Gain (loss) on disposition |  | $ 44.2 |  |  |  |  |  |  | $ 44.2 |

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