Metavolcanic host rocks, mineralization, and gossans of the Shaib al Tair and Rabathan volcanogenic massive sulphide deposits of the Wadi Bidah Mineral District, Saudi Arabia

Re-Evaluation of Kombat-Style Mineralization and Implications for Exploration in the Otavi Mountainland, Namibia

“…XRF analytical data plotted on the discriminant ternary diagrams for sedimentary rocks; (a) Kombat deposit samples compared to (b) theoretical sedimentary rocks discriminant ternary diagram for hydrogenetic, hydrothermal and diagenetic fields from modern ferromanganese deposits (after Boström, 1973)[26]. by lithological transitions, whereby the Cu-Pb-Ag ores are bound to the upper Hüttenberg dolostone and the calc-silicate rocks as a result of changes in both the vertical and lateral permeability of the rocks in the carbonate platform sequence[21] of the OML. The Cu-Pb-Ag mineralization exhibits limited, irregular primary dispersion patterns similar to an analog MVT deposit study[31].Host rock alteration is limited and generally restricted to dolomitization characterized by smoky and white euhedral calcite crystals often surrounded by grey rims of chalcopyrite and galena(Figure 4(a); Figure 8(c), Figure 8(e), Figure 8(g); Figure 7(b)) and silicification reflected by quartz veins (Figure 8(c); Figure 9(c)) around steeply dipping, east-west striking, (F: 79˚/195˚) controlling structures, i.e.…”