An aerial view of the Jansen project. Credit: BHP. BHP (NYSE, LSE, ASX: BHP) wants to use lessons from its maiden foray into potash production to ensure that a subsequent expansion of the facility is completed at or under budget.The world’s biggest miner in July disclosed a $1.7 billion cost overrun in the development of its Jansen potash mine in Saskatchewan as it pushed first production back by six months to mid-2027. The project’s first stage – known as Jansen 1 – is now expected to cost as much as $7.4 ...