The world’s largest mining company, BHP Billiton, is taking lessons from banks to bring its boys’ club era to an end. Chief of staff and geoscience head Laura Tyler, above, who is one of three women in top BHP leadership positions, has been tasked with achieving gender balance by 2025. Financial companies have the highest share of female staff at 52% and mining companies the lowest share at 19%, according to Bloomberg’s world index, which finds the best-performing companies to be those with the highest percentage of female executives. Already, the ten BHP operations with the highest female complements are averaging 15%-better productivity and safety.