EXTRACT:

"And Chinese mined zinc production has been falling, and imports rising to compensate for the production shortfall and the growth in demand. Indeed production in a number of countries has been declining including, in particular, Canada which has seen Xstrata close the big Perseverance and Brunswick mines, and now there is the forthcoming closure of Century in Australia, all very significant zinc producers."

http://www.mineweb.com/mineweb/content/en/mineweb-base-metals?oid=257812&sn=Detail