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
Sona Hill Core SOD 007 Sap-rock
Sona Hill Core SOD 007 Sap-rock/Fresh-rock Contact
Sona Hill Core SOD 032 Fresh Rock
Source:
Preliminary Economic Assessment Report Toroparu Gold Project Upper Puruni River Area, Guyana, 2019 (SRK)