{"filing":{"accession_number":"0001104659-26-079104","cik":"0001341335","ticker":"FSM","company_name":"FORTUNA MINING CORP.","form":"6-K","filing_date":"2026-06-30","report_date":null,"primary_document":"tm2619362d1_6k.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1341335/000110465926079104/tm2619362d1_6k.htm"},"events":[{"id":14854,"run_id":13242,"accession_number":"0001104659-26-079104","anchor_item_number":"EX-99.1","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.85,"summary":"This exhibit is a feasibility study announcement for the Diamba Sud Gold Project, disclosing detailed technical and economic parameters (after-tax IRR of 60%, NPV5% of $1 billion, 9.4-year mine life, 116,000 oz/year average production) and advancing the project toward a final investment decision. While it contains financial projections, it is fundamentally an operational/strategic milestone—the completion of a major development study for a material growth project that supports Fortuna's plan to increase annual gold production by ~60% to over 500,000 ounces by 2028. This is a discrete operational event (feasibility study completion and advancement toward FID), not a periodic financial report or earnings release.","company_name":"FORTUNA MINING CORP.","ticker":"FSM","filing_date":"2026-06-30","form":"6-K","submitted_at":null,"items":[{"id":12416,"accession_number":"0001104659-26-079104","item_number":"EX-99.1","item_title":"tm2619362d1_ex99-1.htm","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.85,"reasoning":"This exhibit is a feasibility study announcement for the Diamba Sud Gold Project, disclosing detailed technical and economic parameters (after-tax IRR of 60%, NPV5% of $1 billion, 9.4-year mine life, 116,000 oz/year average production) and advancing the project toward a final investment decision. While it contains financial projections, it is fundamentally an operational/strategic milestone—the completion of a major development study for a material growth project that supports Fortuna's plan to increase annual gold production by ~60% to over 500,000 ounces by 2028. This is a discrete operational event (feasibility study completion and advancement toward FID), not a periodic financial report or earnings release.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-06-30T12:09:39.467388+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":12416,"accession_number":"0001104659-26-079104","item_number":"EX-99.1","item_title":"tm2619362d1_ex99-1.htm","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.85,"reasoning":"This exhibit is a feasibility study announcement for the Diamba Sud Gold Project, disclosing detailed technical and economic parameters (after-tax IRR of 60%, NPV5% of $1 billion, 9.4-year mine life, 116,000 oz/year average production) and advancing the project toward a final investment decision. While it contains financial projections, it is fundamentally an operational/strategic milestone—the completion of a major development study for a material growth project that supports Fortuna's plan to increase annual gold production by ~60% to over 500,000 ounces by 2028. This is a discrete operational event (feasibility study completion and advancement toward FID), not a periodic financial report or earnings release.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-06-30T12:09:39.467388+00:00","company_name":"FORTUNA MINING CORP.","ticker":"FSM","filing_date":"2026-06-30"}]}