Business Green: Toyota may be many things: auto giant, producer of the iconic Prius, scourge of US car firms, but mining firm? Surprisingly, the answer could be yes. The company’s Toyota Tsusho subsidiary announced last week that it will take a 25 per cent stake in a new joint venture with Australian mining firm Orocobre to develop Argentinian supplies of lithium, the key component in batteries for the electric and hybrid vehicles that Toyota expects to eventually dominate the global auto …