{"filing":{"accession_number":"0001104659-26-117270","cik":"0001341335","ticker":"FSM","company_name":"FORTUNA MINING CORP.","form":"6-K","filing_date":"2026-10-20","report_date":"2026-10-20","primary_document":"tm2627932d1_6k.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1341335/000110465926117270/tm2627932d1_6k.htm"},"events":[{"id":36352,"run_id":33516,"accession_number":"0001104659-26-117270","anchor_item_number":"EX-99.1","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.75,"summary":"This news release discloses results from a 2026 infill drilling program at Fortuna's Lindero Mine in Argentina, reporting multiple gold intersections that confirm mineralization extends significantly below the current life-of-mine pit design. The company plans to incorporate these results into an updated block model, pit design, and revised Mineral Reserve estimate by year-end 2027. While the disclosure is operational in nature (exploration/drilling results), it is material because it demonstrates potential to extend mine life and increase reserves at a producing asset, which would affect investor assessment of the company's future production and cash generation capacity.","company_name":"FORTUNA MINING CORP.","ticker":"FSM","filing_date":"2026-10-20","form":"6-K","submitted_at":null,"items":[{"id":40741,"accession_number":"0001104659-26-117270","item_number":"EX-99.1","item_title":"tm2627932d1_ex99-1.htm","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.75,"reasoning":"This news release discloses results from a 2026 infill drilling program at Fortuna's Lindero Mine in Argentina, reporting multiple gold intersections that confirm mineralization extends significantly below the current life-of-mine pit design. The company plans to incorporate these results into an updated block model, pit design, and revised Mineral Reserve estimate by year-end 2027. While the disclosure is operational in nature (exploration/drilling results), it is material because it demonstrates potential to extend mine life and increase reserves at a producing asset, which would affect investor assessment of the company's future production and cash generation capacity.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-10-20T15:22:38.361193+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":40741,"accession_number":"0001104659-26-117270","item_number":"EX-99.1","item_title":"tm2627932d1_ex99-1.htm","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.75,"reasoning":"This news release discloses results from a 2026 infill drilling program at Fortuna's Lindero Mine in Argentina, reporting multiple gold intersections that confirm mineralization extends significantly below the current life-of-mine pit design. The company plans to incorporate these results into an updated block model, pit design, and revised Mineral Reserve estimate by year-end 2027. While the disclosure is operational in nature (exploration/drilling results), it is material because it demonstrates potential to extend mine life and increase reserves at a producing asset, which would affect investor assessment of the company's future production and cash generation capacity.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-10-20T15:22:38.361193+00:00","company_name":"FORTUNA MINING CORP.","ticker":"FSM","filing_date":"2026-10-20"}]}