{"schema_version":"secwatch.filing_event.v1","accession":"0001493152-25-014390","form_type":"8-K","ticker":"USGO","cik":"0001947244","company_name":"U.S. GoldMining Inc.","filed_at":"2025-09-22T23:59:59+00:00","discovered_at":"2026-05-14T18:02:45.675343+00:00","generated_at":"2026-05-17T06:01:02.637101+00:00","sec_items":["7.01","9.01"],"event_type":"other_material","sentiment":"positive","materiality_score":0.7,"calibrated_materiality_score":0.7,"confidence":"high","headline":"Whistler gold recovery improves to 85.3% via flotation+leach, up 22% from prior test","bullets":["Combined flotation and cyanide leach achieved 85.3% Au, 79.1% Cu, 55.3% Ag recoveries.","Copper concentrate graded 23.7% Cu with 0.6% mass pull; leach recovered additional 31.2% Au from tails.","Previous metallurgy yielded ~70% Au recovery; new 22% increase due to sequential leach step.","Test program used master composite representing average Whistler deposit resource grade (0.68 g/t AuEq).","Results provide key inputs for the ongoing Preliminary Economic Assessment (PEA)."],"urls":{"canonical":"https://secwatch.observer/filing/0001493152-25-014390","json":"https://secwatch.observer/filing/0001493152-25-014390.json","markdown":"https://secwatch.observer/filing/0001493152-25-014390.md","text":"https://secwatch.observer/filing/0001493152-25-014390.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1947244/000149315225014390/0001493152-25-014390-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1947244/000149315225014390/form8-k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-17T06:01:02.637101+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}