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Identification and Activities of the Company and Subsidiaries (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of Identification and Activities of the Company and Subsidiaries [Abstract] |
Summary of Progressive Rates Based on the Final Sale Price | Regarding lithium carbonate, the former rate of 6.8% on FOB sales was changed to the following structure of progressive rates based on the final sale price:
Price US$/MT Li2CO3 |  | Lease payment rate |
$0 - $4,000 |  |  | 6.80 | %
$4,000 - $5,000 |  |  | 8.00 | %
$5,000 - $6,000 |  |  | 10.00 | %
$6,000 - $7,000 |  |  | 17.00 | %
$7,000 - $10,000 |  |  | 25.00 | %
> $10,000 |  |  | 40.00 | %
Regarding potassium chloride, the former rate of 1.8% on FOB sales was changed to the following structure of progressive rates based on the final sale price:
Price US$/MT Li2CO3 |  | Lease payment rate |
$0 - $300 |  |  | 3.0 | %
$300 - $400 |  |  | 7.0 | %
$400 - $500 |  |  | 10.0 | %
$500 - $600 |  |  | 15.0 | %
> $600 |  |  | 20.0 | %
Disclosure of information about employees [text block] | As of December 31, 2019, and December 31, 2018, the workforce was as follows:
|  | As of December 31, 2019 |  |  | As of December 31, 2018 |
Employees |  | S.Q.M S.A. |  |  | Other ‎ subsidiaries |  |  | Total |  |  | S.Q.M S.A. |  |  | Other ‎ subsidiaries |  |  | Total |
Executives |  |  | 30 |  |  |  | 91 |  |  |  | 121 |  |  |  | 33 |  |  |  | 89 |  |  |  | 122 |
Professionals |  |  | 110 |  |  |  | 1,170 |  |  |  | 1,280 |  |  |  | 115 |  |  |  | 1,078 |  |  |  | 1,193 |
Technicians and operators |  |  | 282 |  |  |  | 3,481 |  |  |  | 3,763 |  |  |  | 260 |  |  |  | 3,287 |  |  |  | 3,547 |
Foreign employees |  |  | 17 |  |  |  | 560 |  |  |  | 577 |  |  |  | 11 |  |  |  | 417 |  |  |  | 428 |
Overall total |  |  | 439 |  |  |  | 5,302 |  |  |  | 5,741 |  |  |  | 419 |  |  |  | 4,871 |  |  |  | 5,290 |
Schedule of Shareholders stock and Ownership Percentage [Text Block] | The following information is derived from our registry and reports managed by the DCV and informed to the CMF and the Chilean Stock Exchanges. whose main shareholders are the following:
Shareholders as of December 31, 2019 |  | No. of Series A |  |  | % of Serie A ‎ shares |  |  | No. of Series B |  |  | % of Serie B ‎ shares |  |  | % of total ‎ shares |
Inversiones TLC SpA (1) |  |  | 62,556,568 |  |  |  | 43.80 | % |  |  | - |  |  |  | - |  |  |  | 23.77 | %
Sociedad de Inversiones Pampa Calichera S.A. |  |  | 44,894,152 |  |  |  | 31.43 | % |  |  | 3,793,154 |  |  |  | 3.15 | % |  |  | 18.50 | %
The Bank of New York Mellon, ADRs |  |  | - |  |  |  | - |  |  |  | 38,311,788 |  |  |  | 31.83 | % |  |  | 14.56 | %
Potasios de Chile S.A. |  |  | 18,179,147 |  |  |  | 12.73 | % |  |  | - |  |  |  | - |  |  |  | 6.91 | %
Inversiones Global Mining (Chile) Limitada |  |  | 8,798,539 |  |  |  | 6.16 | % |  |  | - |  |  |  | - |  |  |  | 3.34 | %
Banco Itau via foreign investor accounts |  |  | - |  |  |  | - |  |  |  | 7,373,216 |  |  |  | 6.13 | % |  |  | 2.80 | %
Banco de Chile non-resident third party accounts |  |  | 109 |  |  |  | - |  |  |  | 6,842,746 |  |  |  | 5.68 | % |  |  | 2.60 | %
Banco Santander via foreign investor accounts |  |  | - |  |  |  | - |  |  |  | 6,618,416 |  |  |  | 5.50 | % |  |  | 2.51 | %
Euroamerica C de B S.A. |  |  | 3,056 |  |  |  | - |  |  |  | 4,863,467 |  |  |  | 4.04 | % |  |  | 1.85 | %
Banchile C de B S.A. |  |  | 491,729 |  |  |  | 0.34 | % |  |  | 4,285,696 |  |  |  | 3.56 | % |  |  | 1.82 | %
Inversiones la Esperanza de Chile Limitada |  |  | 4,147,263 |  |  |  | 2.90 | % |  |  | 46,500 |  |  |  | 0.04 | % |  |  | 1.59 | %
Santiago stock exchanges |  |  | 30,590 |  |  |  | 0.02 | % |  |  | 3,077,930 |  |  |  | 2.56 | % |  |  | 1.18 | %
(1) As reported by DCV, which records the Company's shareholders' register as of December 31, 2019 and December 31, 2018, Inversiones TLC SpA, a subsidiary of Tianqi Lithium Corporation ("Tianqi"), is the direct owner of 62,556,568 shares of SQM equivalent to 23.77% of SQM’s shares'' According to information provided to the CMF by Inversiones TLC SpA dated December 5, 2018, Inversiones TLC SpA owns 25.86% of SQM’s shares
Shareholders as of December 31, 2018 |  | No. of Series A |  |  | % of Serie A ‎ shares |  |  | No. of Series B |  |  | % of Serie B ‎ shares |  |  | % of total ‎ shares |
Inversiones TLC SpA (1) |  |  | 62,556,568 |  |  |  | 43.80 | % |  |  | - |  |  |  | - |  |  |  | 23.77 | %
Sociedad de Inversiones Pampa Calichera S.A. |  |  | 44,894,152 |  |  |  | 31.43 | % |  |  | 10,093,154 |  |  |  | 8.38 | % |  |  | 20.89 | %
The Bank of New York Mellon, ADRs |  |  | - |  |  |  | - |  |  |  | 35,254,267 |  |  |  | 29.29 | % |  |  | 13.39 | %
Potasios de Chile S.A. |  |  | 18,179,147 |  |  |  | 12.73 | % |  |  | - |  |  |  | - |  |  |  | 6.91 | %
Banco de Chile via non-resident third party accounts |  |  | 15,687 |  |  |  | 0.01 | % |  |  | 10,703,812 |  |  |  | 8.89 | % |  |  | 4.07 | %
Inversiones Global Mining (Chile) Limitada |  |  | 8,798,539 |  |  |  | 6.16 | % |  |  | - |  |  |  | - |  |  |  | 3.34 | %
Banco Itau via foreign investor accounts |  |  | - |  |  |  | - |  |  |  | 8,085,730 |  |  |  | 6.72 | % |  |  | 3.07 | %
Banco Santander via foreign investor accounts |  |  | - |  |  |  | - |  |  |  | 7,138,685 |  |  |  | 5.93 | % |  |  | 2.71 | %
Banchile C de B S. A. |  |  | 528,092 |  |  |  | 0.37 | % |  |  | 4,028,611 |  |  |  | 3.35 | % |  |  | 1.73 | %
Inversiones la Esperanza de Chile Limitada |  |  | 3,711,598 |  |  |  | 2.60 | % |  |  | 46,500 |  |  |  | 0.04 | % |  |  | 1.43 | %

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