Manhattan Uranium Discovery Corp. has compiled 499 historical drill holes into a modern database for its Lisbon Valley uranium project in Utah, returning an intercept of 3.70% equivalent U₃O₈ over 5.2 feet in hole N-1.

The compiled dataset covers the North Lisbon property along the 16-mile Lisbon Valley uranium trend. More than half of the compiled holes—specifically 266 holes, or 53%—returned mineralized intercepts grading above 0.15% eU₃O₈, with the overall mineralized intervals averaging 0.28% eU₃O₈.

The technical work has established a lithology model focused on the Chinle and Cutler formations and generated 36 high-priority historical intercepts ranked for follow-up, providing a drill-ready target list outside of known underground workings. The data are historical and derived from downhole gamma logging rather than modern chemical assays.

“Lisbon Valley alone produced nearly 80 million pounds of U₃O₈ before production ceased in the late 1980s, and much of that ground has not been evaluated with modern methods. This is not purely greenfield exploration; it is a mill-adjacent district with a substantial historical production history, and that distinction matters in the context of renewed interest in domestic uranium supply.”

— William Sheriff, Chairman of Manhattan

The company holds a portfolio of 15 past-producing uranium mines across 25 properties in the United States following business combinations completed on May 7, 2026, with Urano Energy and Pegasus Resources.

“This is the second major legacy dataset we've compiled and reviewed, and it reflects the broader work underway across our portfolio. We're developing a much deeper understanding of our U.S. assets, which include 15 past-producing mines. At Lisbon Valley specifically, a 53% historical gamma-intercept hit rate averaging 0.28% eU₃O₈ is comparable to the reported 0.30% in the district. We now have a modern drill-ready foundation across the Lisbon Valley.”

— Galen McNamara, CEO and Director of Manhattan

Manhattan Uranium plans continued validation and reconciliation of the historical gamma data with underground workings and modern exploration results, alongside further refinement of the 3D uranium target domains.

Read the full announcement: Manhattan Uranium Identifies 3.70% eU3O8 over 5.2 ft in Compilation of 499 Historical Drill Holes at Lisbon Valley, Utah