It is a bit strange why they haven't been in a trading halt all...

It is a bit strange why they haven't been in a trading halt all the time so as to give themselves time to work out their communication. Giving some the chance to get out yesterday before the price plummeted was probably not something they even considered would become a problem.

I personally believe that the company has been caught out by the low grade coming through the mill. I imagine they have been sending heaps of samples from everywhere trying to reconcile the predicted amounts to what they are actually getting.

They would have also needed time to commission the mill properly and see if it was some fault with the mill or the actual grade. That would take time.

it then comes back to how much it costs per once to retrieve the silver. As they have only put 3000 tonnes of high grade ore through the mill as the rest was relatively mediocre then they should still have a good idea of costs for the mediocre stuff. How much did it cost to get the 135K ounces as of 15 Oct?

Its now understandable for them to try to make the processing and mining more efficient.