{"filing":{"accession_number":"0001104659-26-088588","cik":"0001341335","ticker":"FSM","company_name":"FORTUNA MINING CORP.","form":"6-K","filing_date":"2026-07-30","report_date":"2026-07-30","primary_document":"tm2621717d1_6k.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1341335/000110465926088588/tm2621717d1_6k.htm"},"events":[{"id":22162,"run_id":20033,"accession_number":"0001104659-26-088588","anchor_item_number":"EX-99.1","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.85,"summary":"Fortuna Mining announces approval of a 30% capacity expansion of its Séguéla Gold Mine in Côte d'Ivoire, including processing facility upgrades, infrastructure improvements, and development of the Sunbird underground mine. The project involves $109 million in estimated capital expenditure and is expected to increase annual gold production to over 200,000 ounces with a 2.5-year payback period. This is a material operational and strategic business decision—a significant capital project and mine development initiative—that does not fit the specific categories of M\u0026A, workforce reduction, or other named operational types, making it an operational_other event material to investors assessing the company's growth strategy and capital allocation.","company_name":"FORTUNA MINING CORP.","ticker":"FSM","filing_date":"2026-07-30","form":"6-K","submitted_at":null,"items":[{"id":22024,"accession_number":"0001104659-26-088588","item_number":"EX-99.1","item_title":"tm2621717d1_ex99-1.htm","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.85,"reasoning":"Fortuna Mining announces approval of a 30% capacity expansion of its Séguéla Gold Mine in Côte d'Ivoire, including processing facility upgrades, infrastructure improvements, and development of the Sunbird underground mine. The project involves $109 million in estimated capital expenditure and is expected to increase annual gold production to over 200,000 ounces with a 2.5-year payback period. This is a material operational and strategic business decision—a significant capital project and mine development initiative—that does not fit the specific categories of M\u0026A, workforce reduction, or other named operational types, making it an operational_other event material to investors assessing the company's growth strategy and capital allocation.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-07-31T00:07:11.358464+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":22024,"accession_number":"0001104659-26-088588","item_number":"EX-99.1","item_title":"tm2621717d1_ex99-1.htm","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.85,"reasoning":"Fortuna Mining announces approval of a 30% capacity expansion of its Séguéla Gold Mine in Côte d'Ivoire, including processing facility upgrades, infrastructure improvements, and development of the Sunbird underground mine. The project involves $109 million in estimated capital expenditure and is expected to increase annual gold production to over 200,000 ounces with a 2.5-year payback period. This is a material operational and strategic business decision—a significant capital project and mine development initiative—that does not fit the specific categories of M\u0026A, workforce reduction, or other named operational types, making it an operational_other event material to investors assessing the company's growth strategy and capital allocation.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-07-31T00:07:11.358464+00:00","company_name":"FORTUNA MINING CORP.","ticker":"FSM","filing_date":"2026-07-30"}]}