Andean Silver (ASX: ASL) is keeping its Cerro Bayo project in southern Chile firmly in the spotlight, with drilling now running across several vein systems after a June resource upgrade that lifted Measured and Indicated ounces by 230%. For ASX investors watching the silver developer space, it is a useful example of how a former producer can build scale quickly when it combines modern drilling with an existing footprint.
What the upgrade delivered
The updated resource stands at about 20 million tonnes grading 211 g/t silver equivalent, for roughly 136 million ounces of silver equivalent. Around 60 million ounces now sit in the higher confidence Indicated category, a step that matters because it is the foundation for feasibility work. The underground portion carries the richer grade, at 7.9 million tonnes grading 362 g/t, while the open pit component adds bulk tonnage. The estimate was prepared using conservative price assumptions of US$45 per ounce silver, well below where the metal trades today. Management has pointed to a programme of around 60,000 metres of drilling, including the first district-wide resource growth drilling at Cerro Bayo in 20 years.
Drilling momentum and funding
July updates reported high-grade silver and gold intercepts from the Trinidad vein and encouraging assays from the Delia SE area, with multiple rigs active. Andean reported cash of A$42.7 million at the end of the June quarter, which should keep the drill bits turning while technical studies and restart scenarios are assessed. Investors will be watching for further assay releases, metallurgical work and any feasibility milestones in the coming months. Peers are also moving, and our recent coverage of Investigator Silver launching a 30,000m campaign at Paris shows the same push from exploration to execution across the sector.
Why it matters for ASX silver investors
Silver futures were trading near US$61 an ounce on 6 October, about 7.7% lower than a month ago, a pullback we examined in our look at the silver correction and developer funding. Even so, the longer term case rests on supply tightness. The Silver Institute has reported consecutive annual market deficits, which supports interest in projects that can add meaningful ounces. The risks are real, though. Restarting a mine in Chile requires further studies, permitting, capital and sustained metal prices, and drilling results do not guarantee conversion into production. Explorers and developers also tend to move sharply with the metal, so share price swings can be large. Readers wanting wider context can browse our silver mining news archive.
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