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Golden Star Resources Ltd. Prestea gold deposit. Ghana.
Mineralized core intervals from four different Boreholes, from top to bottom, reef style mineralization (fault fill quartz veins) from Borehole GT-280S2 at a depth of 74.7 m. intersecting the West-Reef Structure, Borehole GT-287S1A at a depth of 130.7 m. intersecting the West-Reef Structure as well, Borehole UC30-270S-108 at a depth of 78.0 m intersecting the Main-Reef Structure, and at the bottom, a mineralized volcanic lens interval with visible gold and characterized by stockwork-like smoky quartz veins intersected in the footwall of the Main-Reef Structure by Borehole UC-270S-108 at a depth of 94.8 m.
Подробнее: Mineralization styles characterizing the Prestea deposit
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Gold X Mining Corp. Sona Hill gold deposit. Guyana.
Alteration is quartz-sericite-carbonate-chlorite alteration, both pervasive and as vein-related selvages. Carbonate minerals petrographically are described as predominantly dolomite, but calcite is also present. Mineralization is related to quartz veins, which tend to follow the rock foliations and the overall westerly dip. of the cataclastic deformation zone. Au mineralization is associate with quartz veins and minor sulfides (pyrite) and is hosted primarily in the intrusive rocks. Quartz veining, which is typically white crystalline quartz, and can be associated with feldspar, carbonate, tourmaline, sericite and chlorite, and minor sulfides (pyrite). Quartz veins can be from a few millimeters up to a meter or more in widths, but typically are in the 0.5 to 10 cm range. Rocks above the shear zone, which are the predominate host to mineralization, are petrographically described as porphyritic/micro-porphyritic/± equi-granular granodiorite to quartzdiorite intrusive rocks. The weathering or lateritic profile has resulted in the developed of saprolite at Sona Hill. Saprock is the transitional zone between saprolite and fresh rock, and forms as a gradational contact a few meters thick. Sap-rock and saprolite are generally thicker at Sona Hill, as the 25 to 30 m of topographic hill results in a greater depth to the water table. At Sona Hill, sap-rock and/or saprolite can be up to 60 m thick. Hill the weathering profile has produced a combination of saprolite and sap-rock, ranging from typical thicknesses of 30 m up to 60 m.
Sona Hill Core SOD 007 Saprolite
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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.
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Gran Colombia Gold Corp. Gran Colombia deposit. Colombia.
Mineralized Quartz Vein within the Gran Colombia Exploration Adit
Source: Segovia Amended PFS Update NI43-101TR (SRK)
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Gran Colombia Gold Corp. El Silencio deposit. Colombia.
Relationship between the mineralized vein and lamprophyre dykes as observed underground at El Silencio.
Source: Segovia Amended PFS Update NI43-101TR (SRK)
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