Middle Island Resources (ASX:MDI) announced the confirmation of a significant, large-scale gold system emerging at the Zabrnjica target within its wholly owned Priboj Project.
The discovery marks a pivotal moment for the region, which has lacked any recorded modern gold exploration until now.
Recent infill soil sampling, comprising 146 distinct samples, has defined a coherent gold-in-soil anomaly extending over an area 600m long and 200m wide, with assay results peaking at 38 parts per billion.
Experts suggest this signature is consistent with substantial replacement-style gold systems, drawing technical parallels to world-class deposits such as the multi-million-ounce Donlin Creek in Alaska.
Surface exploration has further bolstered confidence, with rock chip samples from outcrops returning grades up to 0.68g/t gold, while float samples reached as high as 1.91g/t.
CEO Peter Spiers confirmed that the company is fast-tracking a five-hole reverse circulation drilling campaign scheduled for the current field season.
Beyond gold, Middle Island is diversifying its Serbian portfolio with copper-focused exploration at the adjacent Jermovac licence.
This includes a planned three-hole RC program at the Jelaca prospect to investigate volcanogenic massive sulphide-style mineralisation, where previous rock chips have assayed as high as 10.3% copper.
Spiers noted that Priboj offers "meaningful first-mover discovery potential" within a prospective mineral belt, positioning the company for potentially transformative growth.
At the time of reporting, Middle Island Resources' share price was $0.039.