Northern Star Resources (ASX:NST) said it generated sales revenue of AU$1.55 billion in the March quarter, compared with AU$1.21 billion a year earlier.

Gold sold during the period totaled 385,441 ounces at an all-in-sustaining cost of AU$2,246 per ounce, according to a Tuesday Australian bourse filing. A year earlier, the company sold 400,825 ounces at an all-in-sustaining cost of AU$1,844 per ounce.

The company's fiscal 2025 production and cost guidance was revised to 1.6 million to 1.7 million ounces at AU$2,100 to AU$2,200 per ounce in the wake of delayed access to the Golden Pike North area in its Kalgoorlie consolidated gold mines in Western Australia, higher maintenance costs across its Yandal operations, also in Western Australia, and higher royalties from elevated gold prices, the filing said

Northern Star Resources' shares fell almost 6% in recent trading on Tuesday.