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Financial instruments (Details 1) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial instruments [Line Items] |  |  |
Other non-current financial assets |  | $ 42,879 | $ 14,099
Non-current investments not accounted for using the equity accounting method, classified as available for sale [Member] |  |  |
Financial instruments [Line Items] |  |  |
Other non-current financial assets |  | 9,179 | 6,899
Hedging assets [Member] |  |  |
Financial instruments [Line Items] |  |  |
Other non-current financial assets |  | 8,910 | 7,156
Other financial assets [Member] |  |  |
Financial instruments [Line Items] |  |  |
Other non-current financial assets | [1] | 42,879 | 14,099
Other financial assets, non-current [Member] |  |  |
Financial instruments [Line Items] |  |  |
Other non-current financial assets |  | 45 | 44
Contribution for constitution of Joint Venture [Member] |  |  |
Financial instruments [Line Items] |  |  |
Other non-current financial assets | [2] | $ 24,745 | $ 0
[1] | The detail of other financial assets, non-current is as follows:
[2] | SQM Potasio S.A. contributed ThUS$24,745 to set up Western Australia Lithium (WAL). This has still not been legally constituted as a company, so the funds remain in trust waiting to be transferred to WAL.

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