PRECIOUS METALS

Excelsior production woes add up 

Canada-based Excelsior's Gunnison copper project in south-eastern Arizona in the US is going to need to undergo a "long period of pre-production", which is set to drive up costs.

Nathan Richardson
Excelsior production woes add up 

"Production challenges have highlighted the need to re-engineer wellfield ramp-up, including the introduction of a long period of pre-production CO2 flushing and calcite removal," president and CEO Dr...

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