The OZ Minerals share price is down 6% to $24.59. The catalyst for this was the miner's quarterly update. That update revealed that its gold and copper production fell 6% and 16%, respectively, over the previous quarter. OZ Minerals also reported an increase in its all-in sustaining costs for the period. And while management expects its performance to improve as the year progresses, it hasn't been enough for some investors to stick with the company.