Production at Rio Tinto’s Diavik mine in Canada slid in the first quarter after the miner halted production to allow workers to grieve for colleagues who died in a plane crash. Output fell 22% year on year to 740,000 carats for the three months that ended March 31, Rio Tinto said Tuesday. However, production was 12% higher than the previous quarter, during which the miner closed two kimberlite pipes and produced lower-grade ore. The company