Liberty Star Minerals, a US-based mineral exploration company, has secured 13 additional mineral exploration permits (MEPs) in south-east Arizona.

This additions expand its total mineralised area to around 45 square miles.

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The new claims, covering roughly 11 square miles, build on permits announced earlier in March.

The latest permits enhance the company’s district-scale consolidation efforts in the Tombstone Mining District.

This move secures all targets identified through comprehensive geologic mapping, rock sampling and induced polarisation surveys.

The consolidated area now includes the Earp Ridge Mines, with claims for critical minerals, copper and molybdenum, and the Red Rock Mines, noted for their gold potential.

These efforts aim to secure all identified mineral targets.

South-east Arizona’s porphyry copper belt ranks as one of the world’s leading mineral-producing areas, consistently yielding large copper, gold and molybdenum discoveries.

Arizona is said to be a highly ranked US location for copper and critical mineral production, attracting interest from major mining companies and sovereign investors due to increasing resource security needs in the US.

The company plans to release more updates as fieldwork progresses, and as new assay and geophysical data emerges.

Liberty Star Minerals chairman Pete O’Heeron said: “Our dedicated team followed the geology wherever it led, and then we moved to protect it.

“Forty-five square miles of multi-mineral opportunities across gold, copper, molybdenum and critical minerals, so important to US economic and national security.

“This positions us to attract a serious mining partner and execute our strategic plan. This is a district-scale asset in one of the best mining addresses on Earth.”