Staffing at Bradken's Dunedin foundry has slipped to 52, after it was confirmed six staff at its Hillside Rd site were made redundant this week. The global Australian engineering and foundry company has trimmed its Dunedin staff numbers by almost 30% since October, from 74 to 52. Separately, foundry Esco is closing its Dunedin site at the end of the month, with the loss of 34 jobs. Globally, Bradken has…