Zinc is a base metal. And it is an internationally traded commodity and its supply source is not limited to small areas. This falls outside the definition of metals for stockpiles.

Supply isn't going up as much as demand so the prices of metal, especially that of copper and zinc, are going up.

Base metal prices have been much firmer lately, with declining inventories for zinc pushing up prices.

There are views that the current rare metal stockpile levels are too low. The national stockpile of oil products is equivalent to 90 days of consumption, and metal stockpiles should be that level.

Mine supply in zinc remains very constrained. Zinc is the one metal that deserves a re-rating based on physical demand and supply characteristics alone.

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