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Subsidiaries (Tables) | 12 Months Ended
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Jun. 30, 2018
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Summary of Significant Subsidiaries | The Group’s interest in the subsidiaries results are listed in the table below. For a complete list of the Group’s subsidiaries, refer to Exhibit 8.1 – List of Subsidiaries.
Significant subsidiaries |  | Country of incorporation |  |  |  | Group interest |
| Principal activity |  | 2018 % |  |  | 2017 % |
Coal |  |  |  |  |  |  |  |  |  |  |  |
BHP Billiton Mitsui Coal Pty Ltd |  | Australia |  | Coal mining |  |  | 80 |  |  |  | 80 |
Hunter Valley Energy Coal Pty Ltd |  | Australia |  | Coal mining |  |  | 100 |  |  |  | 100 |
Copper |  |  |  |  |  |  |  |  |  |  |  |
BHP Billiton Olympic Dam Corporation Pty Ltd |  | Australia |  | Copper and uranium mining |  |  | 100 |  |  |  | 100 |
Compañia Minera Cerro Colorado Limitada |  | Chile |  | Copper mining |  |  | 100 |  |  |  | 100 |
Minera Escondida Limitada (1) |  | Chile |  | Copper mining |  |  | 57.5 |  |  |  | 57.5 |
Minera Spence S.A. |  | Chile |  | Copper mining |  |  | 100 |  |  |  | 100 |
Iron Ore |  |  |  |  |  |  |  |  |  |  |  |
BHP Billiton Iron Ore Pty Ltd |  | Australia |  | Service company |  |  | 100 |  |  |  | 100 |
BHP Billiton Minerals Pty Ltd |  | Australia |  | Iron ore and coal mining |  |  | 100 |  |  |  | 100 |
BHP Iron Ore (Jimblebar) Pty Ltd (2) |  | Australia |  | Iron ore mining |  |  | 85 |  |  |  | 85 |
BHP Billiton (Towage Service) Pty Ltd |  | Australia |  | Freight services |  |  | 100 |  |  |  | 100 |
Marketing |  |  |  |  |  |  |  |  |  |  |  |
BHP Billiton Freight Singapore Pte Limited |  | Singapore |  | Freight services |  |  | 100 |  |  |  | 100 |
BHP Billiton Marketing AG |  | Switzerland |  | Marketing and trading |  |  | 100 |  |  |  | 100 |
BHP Billiton Marketing Asia Pte Ltd |  | Singapore |  | Marketing support and other services |  |  | 100 |  |  |  | 100 |
Group and Unallocated |  |  |  |  |  |  |  |  |  |  |  |
BHP Billiton Canada Inc. |  | Canada |  | Potash development |  |  | 100 |  |  |  | 100 |
BHP Billiton Finance BV |  | The Netherlands |  | Finance |  |  | 100 |  |  |  | 100 |
BHP Billiton Finance Limited |  | Australia |  | Finance |  |  | 100 |  |  |  | 100 |
BHP Billiton Finance (USA) Ltd |  | Australia |  | Finance |  |  | 100 |  |  |  | 100 |
BHP Billiton Group Operations Pty Ltd |  | Australia |  | Administrative services |  |  | 100 |  |  |  | 100 |
BHP Billiton International Services Ltd |  | UK |  | Service company |  |  | 100 |  |  |  | 100 |
BHP Billiton Nickel West Pty Ltd |  | Australia |  | Nickel mining, smelting, refining and administrative services |  |  | 100 |  |  |  | 100 |
WMC Finance (USA) Limited |  | Australia |  | Finance |  |  | 100 |  |  |  | 100 |
(1) | As the Group has the ability to direct the relevant activities at Minera Escondida Limitada, it has control over the entity. The assessment of the most relevant activity in this contractual arrangement is subject to judgement. The Group establishes the mine plan and the operating budget and has the ability to appoint the key management personnel, demonstrating that the Group has the existing rights to direct the relevant activities of Minera Escondida Limitada.
(2) | The Group has an effective interest of 92.5 per cent in BHP Iron Ore (Jimblebar) Pty Ltd; however, by virtue of the shareholder agreement with ITOCHU Minerals & Energy of Australia Pty Ltd and Mitsui & Co. Iron Ore Exploration & Mining Pty Ltd, the Group’s interest in the Jimblebar mining operation is 85 per cent, which is consistent with the other respective contractual arrangements at Western Australia Iron Ore.

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