Presumably drones are powered by lithium. I have also seen a documentary about the expected explosion in the use of drones in the US.http://www.abc.net.au/news/2013-03-01/drones-set-for-large-scale-commercial-take-off/4546556?WT.svl=news0
MND Albemarle lithium downsize burns $200M hole in Monadelphous's pocket as latter's contracts terminated
KAI Pilbara Minerals buys land off Kairos part of its York gold project for $20M – and a 2% royalty on any PLS gold sales