extension of deadline for copperco

Announcement – Extension of Deadline for CopperCo to Make an Offer for Minsec and Amendment to Bidding Agreement
Extension of deadline for CopperCo to make an offer for Minsec

CopperCo Limited (“CopperCo”) and Mineral Securities Limited (“Minsec”) announce an agreed extension of the
deadline for CopperCo to dispatch its offer documents to 30 June 2008.

CopperCo anticipates dispatch of the offer documents to Minsec shareholders on or around 20 June 2008.

Amendment to Bidding Agreement
At the time of the announcement of the proposed Offer on 29 January 2008, the Bidding Agreement provided that those
Minsec Directors who were not already CopperCo Directors (“Minsec Independent Directors”) would join the board of
CopperCo on completion of the Offer. Minsec directors, the Hon. John Moore AO and Keith Liddell are also directors of
CopperCo.

The amount of time that has passed since the announcement of the proposed Offer, due largely to jurisdictional
complexities, has given the boards of both companies an opportunity to further consider the implementation and
restructuring phase that will follow completion of the Offer. The key assets of the merged entity will lie in the southern hemisphere and the CopperCo Directors and the Minsec Directors now recognise that for effective operational management and cost reasons the Enlarged CopperCo Group will be headquartered in Australia.
Therefore, following discussions between the companies, it has now been agreed that the Bidding Agreement be amended so that CopperCo will defer until after completion of the Offer, any decision by CopperCo to invite any of the
current Minsec Independent Directors, all of whom are based in the UK, onto the board of CopperCo.

As previously announced Keith Liddell, the current chief executive officer of Minsec and the current non-executive
chairman of CopperCo, will become the chief executive officer of the Enlarged CopperCo Group and will have primary responsibility for precious metals. Brian Rear, the current managing director of CopperCo, will be the managing director of the Enlarged CopperCo Group and will have primary responsibility for base metals.