求翻译：was responsible for a number of investments of new collieries, mines and technology (including Mpisi Coal and BHP Billiton's latest mine in Gabon), took a leading role in various investments in existing asstes (including BHP's manganese mining assets), lead strategy formulation processes (including BHP Billiton Manganese, marketing, iron ore and chrome industry), ensured compliance to RSA mining laws, including the required selling to empowerment groupings. He also took a leading role in management of the Group's assets and was responsible for strategy formulation and alignment and capital growth projects.是什么意思？

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