Investors responded, sending the little-traded Altus' share price up 6.8% to 3.8p (US4.85c).
The boost came from rock chip sampling at the Simret prospect, which is part of the Daro VMS project.
The highest numbers from the 31-sample programme were 944g/t and 540g/t silver, and 3.55g/t gold.
Altus CEO Steve Poulton said the numbers showed the possibilities of the region's copper-gold-silver mineralisation.
"We are delighted to announce the discovery of the Simret prospect," he said.
"Our exploration has returned very high silver grades including 944g/t Ag, 540g/t Ag, 277g/t Ag and 191g/t Ag from rock chip sampling of quartz veins."
Altus was drawn to a 2.8km by 500m area through stream sampling, which showed anomalous copper, lead and zinc.