The Gramalote Ridge and Trinidad deposits are considered to be examples of structurally-controlled intrusive-related gold deposits.
Intrusive-related gold deposits have many synonyms, including Intrusion-related gold systems, gold porphyries, and plutonic-related gold quartz veins. The deposit model that follows is abstracted from Lefebure and Hart (2005).
The deposit shows a number of the features of intrusive-related gold deposits, including:
• Alteration and mineralization are structurally controlled, restricted to small haloes along veins, sheeted veins and stockworks arrays;
• Sulphides content is less than 5%;
• Some evidence indicates that the host rock is directly related to fluids evolved from the cooling pluton, including pegmatite, aplite and K-feldspar alteration (Rodríguez, 2009).
The QP is of the opinion that exploration programs that use a structurally-controlled, intrusive-related gold model are applicable to the Project area.
The Project is located in the northern portion of Colombia’s Central Cordillera. The terrane primarily comprises a metamorphic basement complex and the Antioquia Batholith. The Cajamarca–Valdivia basement terrane (Cediel and Ciceres, 2000 and Cediel et al, 2003) consists of early Paleozoic metamorphic rocks; as well as ophiolitic, oceanic, volcanic, and intrusive rocks.
In the general Project area, the main compositional types within the Antioquia Batholith are t ........
