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(Sharecast News) - Orosur Mining said on Tuesday that it had discovered new mineralised zones at the APTA prospect within its wholly-owned Anz gold project in Colombia, after the first new hole drilled at the target returned a broad gold intersection.
The AIM-traded company said hole MAP-106A intersected 229.7 metres grading 0.88 grams of gold per tonne, including several higher-grade intervals.
Those included 6.85 metres at 2.15 grams per tonne, 59.2 metres at 2.02 grams per tonne, 7.65 metres at 7.07 grams per tonne and 4.7 metres at 3.95 grams per tonne.
Orosur said the result had substantially enhanced the prospectivity of APTA, with three areas now requiring follow-up work.
The Anz project covers about 330 square kilometres in Colombia's Mid-Cauca gold belt, west of Medelln.
APTA has previously seen almost 39,000 metres of drilling since 2012 and was the original prospect on which the Anz project was based.
Despite many historical holes intersecting substantial high-grade mineralisation, Orosur said no mineral resource estimate had been calculated because of uncertainty over the geological model and controls on mineralisation.
The company said geological work in early 2026 had developed a new concept in which gold mineralisation is constrained within silicified sediments and volcaniclastics bounded by two large faults about 100 metres apart, forming the Aragon fault zone and acting as conduits for gold-bearing fluids.
Hole MAP-106A was designed to test that model and intersected gold mineralisation almost immediately after passing through the footwall fault, at a vertical depth of about 70 metres.
Orosur said the broader lower-grade intersection contained higher-grade zones consistent with, and expanding on, previous drilling.
The company said the latest work had confirmed and expanded the potential scale of deeper, higher-grade mineralisation at APTA, where previous drilling had defined a zone more than one kilometre long and up to 100 metres wide.
Future drilling would be planned to expand and infill that zone.
Orosur also identified shallow bulk-tonnage potential within the fault-bound mineralised zone, where no shallow drilling has previously been carried out, and said a programme would be developed to test that area.
A third target is a narrow hanging-wall mineralised vein defined by earlier drilling, which the company said showed reasonable continuity, grade and thickness and may be amenable to exploitation with further drilling.
Chief executive officer Brad George said APTA had "always tantalising but misunderstood" because previous drilling had not been pulled together into a coherent model.
"After almost 15 years, this is now being done, and looking exciting," he said.
At 1029 BST, shares in Orosur Mining were up 6.33% at 21p.
Reporting by Josh White for Sharecast.com,
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