U.S. GoldMining Inc.

Technical Information

For further information regarding the Project, please see the technical report summary titled “Whistler Gold-Copper Project, S-K 1300 Technical Report Summary and Initial Assessment with Economic Analysis, Alaska, United States of America” (the “S-K 1300 Report”) prepared under subpart 1300 of Regulation S-K under the U.S. Securities Act of 1933 (“S-K 1300”) and the Canadian National Instrument 43-101 (“NI 43-101”) technical report titled “Whistler Gold-Copper Project, NI 43-101 Technical Report and Preliminary Economic Assessment”, each dated effective March 2, 2026. The S-K-1300 Report is available under the Company’s profile atwww.sec.gov and the NI 43-101 Report is available under its profile atwww.sedarplus.ca.

The results of the PEA are preliminary in nature and are intended to provide an initial assessment of the Project’s economic potential and development options. The PEA is not a pre-feasibility study or a feasibility study. Mineral resources are not mineral reserves and do not have demonstrated economic viability. Among other things, the PEA, including its mine schedule, cost estimates and economic assessment, includes numerous assumptions and there can be no certainty that this initial economic assessment will be realized. Actual results may vary, potentially materially and readers are cautioned not to place undue reliance on the results of the PEA.

Tim Smith, P.Geo., Chief Executive Officer of the Company, has supervised the preparation of this news release and has reviewed the additional scientific and technical information contained herein. Mr. Smith is a qualified person as defined under NI 43-101 and S-K 1300.

About U.S. GoldMining Inc.

U.S. GoldMining Inc. is an exploration and development company focused on advancing the 100% owned Whistler Gold-Copper Project, located 105 miles (170 kilometers) northwest of Anchorage, Alaska, U.S.A. The Whistler Project consists of several gold-copper porphyry deposits and exploration targets within a large regional land package entirely on State of Alaska mining claims totaling approximately 53,700 acres (217.5 square kilometers).

Visitwww.usgoldmining.us for more information.