Ariquemes Tin Exploration Project


Tin mineralization was discovered at Ariquemes in 1987 and mining operations have since generated >300,000t of tin. The Company has acquired a highly prospective set of applications and approved exploration licences total 293,500 ha – a dominant land position.

Meridian leveraging strong relationships and operating track record in Brazil to target new projects

Opportunity to utilize modern exploration and production techniques in region known for artisanal tin-production

Potential for near mine discovery within existing mining district

Dominant land position with Brazil’s 2nd largest tin district

Significant exploration opportunity in largely unexplored surrounding area

Land Position


Meridian is focused on assets in the the state of Rondônia in northwestern Brazil. The Ariquemes project is located in the Ariquemes tin district, approximately 300 kilometres north of the Meridian’s Cu-Au polymetallic project at Espigão d’Oeste.


The Ariquemes tin district is located approximately 300 kilometres north of the Meridian’s manganese project at Espigão and has produced approximately 3% of the world’s tin over the last 30 years. . Following the initial discovery of mineralization by a woodcutter clearing trees for a road, the region was soon home to thousands of artisanal miners (called garimpeiros). These early miners worked the alluvial and colluvial mineralization using an array of basic recovery techniques achieving modest recoveries (~50%). At its peak the region was producing more than 30,000 tonnes of tin per annum.


The Ariquemes Project is located within the “Rondoniano San Ignácio / Jamari Domain” The Domain formed through successive accretion of arcs, ocean basin closure and final oblique microcontinent–continent collision. Older basement rocks were affected by later collision-related deformation and metamorphism during the Sunsás Orogeny (1.25–1.00 Ga). The tin mineralization event is particularly associated with the Neo-Proterozoic “Younger Granites” of Rondônia.