Roc, which has a 37.5% interest in Cliff Head, yesterday said this caused trucking of oil to the BP refinery at Kwinana to be suspended late Monday.

“The problem is currently being rectified and it is expected that production will recommence as soon as possible,” the company said.

Roc recently said gross oil production at Cliff Head has generally ranged between 11,000 barrels of oil per day (bopd) and 12,500bopd, with a high of 15,800bopd.

The range is a result of intermittent downstream constraints, most recently relating to trucking capacity, which are currently being addressed, it said.

Cliff Head partners and their associated equities are Roc, AWE Oil (27.5%), Wandoo Petroleum, a Mitsui subsidiary (24%), Arc Energy (6%) and CIECO Exploration and Production (5%).