what does the back calculation of the cash to volume of concentrate show? seems to pass sniff test; price looks around U$2350-2400/tn which is about right for recent pricing (using your $150/t TC, 15% participation for a smelter, 73c AUD, 20,000tn of con, $27M rev)
have you seen how tight it is in China? Shanghai stockpiles at historic lows, traders might have missed an easy flip, looks like someone wanted it most and put money where their mouth was
