JOHANNESBURG (Mineweb) – For listed mining companies everywhere, this year has been all about stock prices facing headwinds, along with relentless pressure on CEOs. The benchmark stock, BHP Billiton, the world’s biggest diversified resources group, saw its stock price in US dollar terms peak out in the latter stages of 2010. Given the wobbles in the global economy, the fall from there has been relatively modest, from around US$26.00 a share to recent trades around US$19.00. Vale, the world’s No 2 miner by market value, has seen its stock price…