Rio Grande Projects

Rio Grande Projects

Aguia’s Rio Grande assets are located in the state of Rio Grande do Sul in Southern Brazil. The Rio Grande Deposits consist of the Três Estradas, Joca Tavares, and Porteira carbonatite-hosted phosphate and the Cerro Preto sediment-hosted phosphate. These deposits are located in a farming region some 350 km from the State Capital Porto Alegre. The region is well serviced by roads, rail, port and power.


  • Aguia Resources is focused on being the sole source of domestic phosphate supply to the fertilizer market in southern Brazil
  • 74.7Mt JORC compliant resource (0.745Mt Measured, 15.07Mt Indicated and 58.9Mt Inferred) with average grade of 4.13% P2O5.
  • Phase 2 drilling complete and Phase 3 expansion drilling underway
  • Ideal location with proximity to local infrastructure (roads, rail, power, port) in a major farming region that imports 100% of it’s phosrock
  • Team in place to take Três Estradas through to production
  • Bankable Feasibility underway with a focus on further optimization as the resource continues to grow
  • EIA submitted for review by FEPAM Oct 2016

Três Estradas

Aguia’s Três Estradas project is located in the state of Rio Grande do Sul. Southern Brazil in a major farming region which currently imports 100% of its phosrock requirements. There are currently no phosphate mines in the region and none scheduled to be built in the foreseeable future other than Aguia’s planned development of Três Estradas. Aguia’s landholding in Rio Grande do Sul currently totals about 78,150 hectares. Três Estradas is the most advanced of Aguia’s holdings in the region which also includes the carbonatite-hosted Joca Tavares with adjacent targets being explored.

Since 2011 Aguia has been advancing exploration and development of Três Estradas, including geological mapping, soil and rock sampling, ground mag surveys, auger, diamond and reverse circulation drilling.

The Três Estradas audited pit-constrained JORC compliant resource is estimated to be 74.7 million tonnes with an average grade of 4.13% P2O5, comprising 745,000 tonnes of measured resource grading 4.42% P2O5, 15.07 million tonnes of indicated resource grading 4.75% P2O5 and 58.89 million tonnes of inferred resource grading 3.97% P2O5.

The proposed project will also include a resource of 2.75 million tonnes grading 4.37% P2O5 from the nearby Joca Tavares carbonatite, which includes 915,000 tonnes of measured resource grading 3.98% P2O5, 1.5 million tonnes of indicated resource grading 4.31% P2O5 and 329,000 tonnes of inferred resource grading 5.74% P2O5.

The phosphate recoveries defined at Eriez Flotation Division of 84% for fresh carbonatite and 80% for oxide using column flotation, together with a high quality by-product calcite, Test work shows oxide ore can be processed in the same column as fresh rock so only one column is required which will reduce CAPEX and increase operating efficiencies.

Metallurgical studies also confirm the presence of a high quality calcite by-product which will add a secondary revenue stream to the Três Estradas deposit once in production. From the rougher tailing of the phosphate flotation, a calcite concentrate grading 48.55% CaO was produced with a CaO recovery of 83.1%. Due to a high reactivity, the calcite is suitable as a high quality aglime to be spread on fields to reduce acidity and meets the specifications of the cement industry, animal nutrition market and to neutralize sulphur in thermoelectric plants.

The Três Estradas project contemplates an open-pit, truck and shovel operation, mining both the Três Estradas and Joca Tavares deposits over a life of mine of 14 years. The processing plant will include a primary crusher, SAG mill and a sequence of rougher-cleaner-cleaner-scavenger column flotation to produce a 30 to 31% P2O5 concentrate. The tailings of the phosphate rougher flotation will then be subject to magnetic separation and mica flotation to produce a high-quality calcite concentrate.

Três Estradas is located in a predominantly farming region with proximity to local infrastructure including roads, a rail line through the property and power. Major fertilizer blenders are located just 200km away at Porto Alegre.