LEIGHTON Holdings has lost one of its senior executives at its troubled Indonesian coal operations as speculation mounts that another of its mining company partners in the South Kalimantan province is preparing to dramatically scale back work at one of its flagship coalmines. It is understood Jim Russell, the finance director at Leighton Contractors Indonesia, has recently left the company as Leighton subsidiary Thiess Contractors Indonesia remains in a legal dispute with mining giant Bumi Resources, which owns the Senakin and Satui thermal coalmines in the province.