Ann: Hamersley Iron Project Agreement , page-8

why are we selling our 49% stake;
I suppose the announcement said:
"SVG also has the right to purchase 100% equity interest in the project by paying CAZ $0.50/tonne of its participating interest in a JORC compliant mineral resource within 18
months or, if between 18 months and 36 months, by the payment of $1.00/tonne of CAZ�s participating interest in a JORC compliant mineral resource. Current inferred resources for
the project are stated at 143mt @ 52.6% Fe (55.6% CaFe)"

So as per the aggrement I supppose SVG always had a right to excerise this option at their discretion.