{"filing":{"accession_number":"0001063259-26-000027","cik":"0001063259","ticker":"DNN","company_name":"DENISON MINES CORP.","form":"6-K","filing_date":"2026-07-28","report_date":"2026-07-28","primary_document":"form6-k.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1063259/000106325926000027/form6-k.htm"},"events":[{"id":21251,"run_id":19153,"accession_number":"0001063259-26-000027","anchor_item_number":"EX-99.1","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.85,"summary":"This press release announces the completion of site preparation activities and commencement of full-scale construction at Denison's Phoenix ISR uranium mine, a major operational and strategic milestone. The disclosure details progress on critical construction activities (freeze wall installation, concrete pours, workforce ramp-up to ~400 people, second-shift commencement) and represents a material advancement of the company's flagship Wheeler River Project toward commercial production. While not fitting a discrete named category (not M\u0026A, not a workforce reduction, not a specific financial event), this is clearly a material operational milestone that would affect a reasonable investor's assessment of the company's development trajectory and capital deployment.","company_name":"DENISON MINES CORP.","ticker":"DNN","filing_date":"2026-07-28","form":"6-K","submitted_at":null,"items":[{"id":20847,"accession_number":"0001063259-26-000027","item_number":"EX-99.1","item_title":"dmc-pr20260728fullscaleco.htm","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.85,"reasoning":"This press release announces the completion of site preparation activities and commencement of full-scale construction at Denison's Phoenix ISR uranium mine, a major operational and strategic milestone. The disclosure details progress on critical construction activities (freeze wall installation, concrete pours, workforce ramp-up to ~400 people, second-shift commencement) and represents a material advancement of the company's flagship Wheeler River Project toward commercial production. While not fitting a discrete named category (not M\u0026A, not a workforce reduction, not a specific financial event), this is clearly a material operational milestone that would affect a reasonable investor's assessment of the company's development trajectory and capital deployment.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-07-29T00:09:29.504817+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":20847,"accession_number":"0001063259-26-000027","item_number":"EX-99.1","item_title":"dmc-pr20260728fullscaleco.htm","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.85,"reasoning":"This press release announces the completion of site preparation activities and commencement of full-scale construction at Denison's Phoenix ISR uranium mine, a major operational and strategic milestone. The disclosure details progress on critical construction activities (freeze wall installation, concrete pours, workforce ramp-up to ~400 people, second-shift commencement) and represents a material advancement of the company's flagship Wheeler River Project toward commercial production. While not fitting a discrete named category (not M\u0026A, not a workforce reduction, not a specific financial event), this is clearly a material operational milestone that would affect a reasonable investor's assessment of the company's development trajectory and capital deployment.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-07-29T00:09:29.504817+00:00","company_name":"DENISON MINES CORP.","ticker":"DNN","filing_date":"2026-07-28"}]}