The Ootsa measured and indicated resources now stand at 439 million tonnes grading 0.32%, which is up 96% compared to a 2016 estimate.
The update also shows 138 million tonnes grading 0.28% CuEq in the inferred category.
The MRE update is based on a drill hole database of about 152,000 metres of drilling, including about 50,000 metres drilled since 2018. The pit constrained resources are at both the Seel and Ox deposits.
The Seel deposit held the bulk of the measured and indicated resources, with 380 million tonnes grading 0.32% CuEq.
"With recent resource updates at both Ootsa and Berg now in place, and a 22,000 metre regional exploration programme underway, we believe there is strong potential to drive value through discovery and continue to advance this premier Canadian copper district," Surge's CEO Leif Nilsson said.
"In a world that is starved of developable large-scale copper resources in safe jurisdictions, the Ootsa-Berg district is special due to its significant size potential and proximity to world-class mining infrastructure," he said.
Surge's planned next steps for Ootsa include ongoing metallurgical test work, long lead-time environmental baseline monitoring programmes, looking into district-wide infrastructure options, and the ongoing exploration.
The company's share price rose 8% day on day to C$0.205 (US$0.16) on June 21. In the past 52-weeks, it has seen a high/low of C$0.465/C$0.185.
Surge has a market capitalization of C$34.75 million.