The Toroparu Gold Project is located within the Guiana Shield, which encompasses eastern Venezuela, Guyana, Suriname, French Guiana, and parts of northern Brazil. The shield's northern part is composed of alternating volcano-sedimentary belts and large granitoid batholiths of the Paleo-Proterozoic age. The Guiana Shield forms the northern segment of the Amazonian Craton of South America, a dismembered portion of the West African Craton. Well-known for its gold potential, the West African Craton shares the same geological history as parts of the Guiana Shield.
Over 30 gold deposits are in production as a result of the systematic exploration of the West African Paleo-Proterozoic volcano-sedimentary belts. A similar approach by multinational exploration companies in the 1990s led to the discovery of giant gold deposits like Las Cristinas and Las Brisas in eastern Venezuela. In contrast, alluvial miners working in river drainages have made all the discoveries to date in western Guyana, meaning that large parts of the volcano-sedimentary belts remain insufficiently explored. These areas, then, retain a significant potential for discovering additional major deposits similar to those found in the more explored portions of the shields.
The Toroparu Gold Deposit forms a west-north-west oriented elongated cloud of disseminated mineralization located along the contact zone between a sequence of intermediate metavolcanics and an intrusive of tonalitic to quartz-dioritic composition. The mineralization is marked by a Chalcopyrite-Bornite-Pyrite-Molybdenite ore assemblage that appears to be controlled by a stockwork of disseminated fine fractures and veinlets of dilational aspect.
The system, which forms a corridor that is approximately 2.7 km long, 200 m to 400 m wide, and over 400 m deep, consists of several mineralized lenses:
This mineralized corridor is surrounded by a phyllic to propylitic alteration cloud that represents several alteration phases. These geological and mineralogical features reflect overprinting magmatic-hydrothermal events, indicating that the Toroparu Gold Deposit is an intrusion related, possibly overprinted Porphyry style, deposit.