Pottermore,Read post # 5324774 by shrewd crude if that helps for a rough guesstimate. He was mentioning something like 200TCF which is absolutly mind blowing.
KAI Pilbara Minerals buys land off Kairos part of its York gold project for $20M – and a 2% royalty on any PLS gold sales
MND Albemarle lithium downsize burns $200M hole in Monadelphous's pocket as latter's contracts terminated