Agree with Melua, they are in there to guarantee supply.
That being said, nothing prevents them from topping up if they see long term value here. We are not far off 'strong buy' levels...27-month nickel futures are still above $US30,000, the forward curve has mostly flattened...I am not concerned about what the spot price is doing as AGM is not selling into the spot market.
http://www.lme.co.uk/nickel.asp