Gran Colombia Gold Corp. Marmato gold deposit. Colombia.

The deposit mainly comprises sulfide-rich veinlets and veins composed of minor quartz, carbonate, pyrite, arsenopyrite, Fe-rich sphalerite (i.e. marmatite), pyrrhotite, chalcopyrite and electrum in the epithermal upper zone, and quartz, pyrrhotite, chalcopyrite, bismuth sulfide and telluride minerals and free gold in the mesothermal lower zone. Pervasive early propylitic alteration is over-printed principally by phyllic and intermediate argillic alteration related to the gold mineralized veins of low to intermediate sulfidation epithermal type, with weak and patchy potassic (biotite) alteration at depth.

Low to intermediate sulfidation epithermal style mineralization. 0.25 m @ 17.5 g/t Au, 19 g/t Ag.

 Epithermal style mineralization

Gran Colombia Gold Corp. Gran Colombia deposit. Colombia.

Mineralized Quartz Vein within the Gran Colombia Exploration Adit

Quartz Vein Gran Colombia

Source: Segovia Amended PFS Update NI43-101TR (SRK)

Gran Colombia Gold Corp.

Gran Colombia Gold Corp. El Silencio deposit. Colombia.

Relationship between the mineralized vein and lamprophyre dykes as observed underground at El Silencio.

Quartz‐sulfidic veins El Silencio

Source: Segovia Amended PFS Update NI43-101TR (SRK)

Gran Colombia Gold Corp.

Gran Colombia Gold Corp. Sandra K deposit. Colombia.

Mesothermal quartz‐sulfidic veins hosted in granodiorite rocks.

Sandra K gold ore

Gran Colombia Gold Corp. Providencia deposit. Colombia.

Mesothermal quartz‐sulfidic veins hosted in granodiorite rocks.

Providencia quartz-sulfidic vein

Source: Segovia Amended PFS Update NI43-101TR (SRK)

Gran Colombia Gold Corp.