https://www.reuters.com/article/us-zinc-vedanta/vedanta-to-shut-down-skorpion-zinc-operations-namibia-for-four-months-idUSKBN1WP2G1This is also likely helping - should provide some short term support to the zinc price.
DUR Duratec snags $76.5M in works from Woodside and Defence respectively - including spy network upgrade