Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Rank | Value | Name | Source of wealth | 2007 Rank |
| --- | --- | --- | --- | --- |
| 1.0 | £27700m | Lakshmi Mittal | Steel | 1 |
| 2.0 | £11700m | Roman Abramovich | Oil, industry | 2 |
| 3.0 | £7000m | Gerald Grosvenor, 6th Duke of Westminster | Property | 3 |
| 4.0 | £6200m | Srichand and Gopichand Hinduja | Industry and finance | 4 |
| 5.0 | £5726m | Alisher Usmanov | Steel and mining | [new entry] |
| 6.0 | £5650m | Ernesto and Kirsty Bertarelli | Pharmaceuticals | [new entry] |
| 7.0 | £5400m | Hans Rausing | Food packaging | 6 |
| 8.0 | £4650m | John Fredriksen | Shipping | 8 |
| 9.0 | £4330m | Sir Philip Green | Retailing | 7 |
| 10.0 | £4300m | David and Simon Reuben | Property | 8 |
| 11.0 | £3974m | Leonard Blavatnik | Industry | [new entry] |
| 12.0 | £3730m | Seán Quinn | Quarrying, property, insurance | 12 |
Question:
What source of wealth has a value of £5726m?
Answer:
Steel and mining