Northern Star Resources provided its December 2012 quarterly activities report, reporting that a series of performance records at the company's Paulsens gold mine in WA resulted in it recovering 20,515oz in the three months at a cash cost of $600/oz and total cost of $924/oz. The strong results came despite the Paulsens mill being closed for nine days to enable the plant upgrade to be completed. The increase in processing capacity means the company is set to produce more than 100,000oz at Paulsens in calendar 2013. This increased production, combined with higher head grades and lower costs, means the company is on track to generate up to $85m in surplus cash from operations for 2013. Ore stocks at the end of the quarter totalled 102,022t containing 10,777oz of gold, an increase of more than 85% from the previous quarter. Gold in circuit and transit was 4,283oz. Gold sales for the quarter were 19,728oz at $1,665/oz, generating revenue of $32.9m.