Net earnings for the three-month period were US$31.1 million, or US17c a share.
Headline earnings, which typically exclude one-off items for a given period, came in at $47 million, or 26c a share, which comfortably beat average Wall Street analyst forecasts calling for adjusted earnings of 6c a share, on forecast revenue of $83.48 million.
In fact, revenue came in at $146.5 million as a result of selling 115,309oz of gold.
The mine produced 111,340oz gold in the June quarter at a grade of 14.9g/t.
Pretium's cash balance increased by more than $72 million through the quarter to $142.5 million, as a result of the improved production at lower costs.
Brucejack is forecast to produce between 200,000oz and 220,000oz during the second half of the year, for total 2018 output of 387,000 to 407,000oz. AISC for the second half of 2018 are expected to range from $710 to $770/oz of gold sold.
The cost guidance does not include the estimated $25 million required to increase the mill capacity to 3,800 tonnes per day, for which the company has filed an application with local authorities.
Pretium's NYSE-quoted shares have been trading in a range of $6.17 to $12.44 over the past year, and closed 19.07% higher on Friday at $9.24 apiece, which gives the company a market valuation of $1.7 billion.