Historique des déclarations
| 13/11/2008 | Ospraie Management LLC | <3% | N/A |
| 10/11/2008 | FIL Limited | < 3% | 2,84% |
| 05/11/2008 | Delta Partners LLC | >3% | 3,47% |
| 04/11/2008 | FIL Limited | <5% | 4,62% |
| 04/11/2008 | Ospraie Management LLC | <5% | 4,19% |
| 24/10/2008 | FIL Limited | >5% | 7,11% |
| 08/10/2008 | Ospraie Management LLC | > 5% | 6,28% |
| 01/10/2008 | Lansdowne Partners LP | < 3% | N/A |
| 01/09/2008 | Umicore N.V. | >5% | 5,25% |
| 04/09/2008 | Ospraie Management LLC | >5% | 7,41% |
| 01/09/2008 | FIL Limited | >7,5% | 9,56% |
| 01/09/2008 | Greenlight Capital Inc. | >5% | 5.45% |
| 01/09/2008 | Ospraie Management LLC | >7,5% | 7,67% |
| 01/09/2008 | OZ Minerals Limited | >7,5% | 7,79% |
| 01/09/2008 | BlackRock Group | <7,5% | 6,90% |
| 01/09/2008 | Lansdowne Partners LP | >3% | 4,43% |
| 29/08/2008 | Lansdowne Partners LP | >3% | 4,91% |
| 18/07/2008 | Ospraie Management LLC | >5% | 7,67% |
| 11/03/2008 | FIL Limited | >5% | 9,03% |
| 24/12/2007 | Greenlight Capital Inc. | >5% | 5,007% |
| 06/12/2007 | Umicore N.V. | >5% | 5,25% |
| 22/11/2007 | Greenlight Capital Inc. | >3% | 3,54% |
| 09/11/2007 | Ospraie Management LLC | >5% | 5,06% |
| 05/11/2007 | FIL Limited | >5% | 7,02% |
| 05/11/2007 | Ospraie Management LLC | >3% | 3,35% |
| 31/10/2007 | Lansdowne Partners LP | >5% | 5,20% |
| 31/10/2007 | BlackRock Group | >5% | 8,13% |
