Ann: Winmar to seek Dual Listing on London Stock Exchange, page-327

There is no point in just pushing ore through a plant. It has to be tested carefully to make sure they can maximise recovery.
If you just push ore through a plant without sufficient testing you can end up dumping a lot of the product into the tailings dam and end up losing money.

Only 2 weeks ago WFE announced they were commencing bulk sampling for metallurgical testing. This takes time to get best results, months.