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.

This is no doubt a bullish factor. Copper, lead and zinc are the three metals that are suffering supply disruption from strike action.

The zinc market is going to become as tight as copper. Every speculator is buying zinc now.

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.

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.