Mineralization in the Wadi Hammad area is represented by polymetallic vein-type and occurs in four modes, they are mineralized main quartz vein, silicified shear zone, associated hydrothermal alterations, and breccia zones. They mainly occur in the contact between Dokhanvolcanics and Younger granites and are confined to and controlled by the Wadi Hammad shear zone. The study revealed that Dokhan volcanics have adakitic nature and formed by slab melt. Accordingly, these rocks are favorable sites for the formation of Au-(Cu)deposits. Hammad granite rocks are characterized bymetaluminous to weakly peraluminous, span the boundary between the ilmenite-magnetite series, transitional between moderately and strongly oxidized granites, situated a relatively shallow to moderate depths (20 to 30 km), and started to crystallize at temperatures around 800 °C. It is suggested that mineralization in WadiHammad formed due to intrusion of the strongly oxidizing, water- and volatile-rich, and alkaline to alkalie-calcic magma into the adakiticDokhan volcanic leads to circulation of these fluids in the latter leaching the available metals (Au and base metals). The leached metals are deposited in preexisting open fissures at the cold end of convective cells near the surface form Au (Cu)-rich quartz veins.

Meeting future material needs requires expanding metal supply while reducing environmental footprints and improving the efficiency of exploration and resource assessment. The Wadi El-Muweih area, located north of the Aswan region in Egypt’s Eastern Desert, hosts significant iron ore potential within the Late Cretaceous Nubia sandstone (Taref Formation). This study provides a systematic, integrated approach for delineating ironstone extensions to support more targeted field campaigns and responsible development pathways. Remote sensing enabled the rapid screening and mapping of iron-bearing zones, subsequently validated through field observations and mineralogical and geochemical analyses. The iron-bearing middle member of the Taref Formation consists of glauconitic/chamositic and ferruginous sandstones, with ironstone bands occurring in three fining-upward cycles. The mineralogical results indicate chamosite, hematite, and goethite as primary constituents, with detrital quartz and apatite in varying proportions. The geochemical data show high Fe₂O₃ (avg. 68.83%) and SiO₂ (avg. 13.13%), with elevated Al₂O₃, CaO, and P₂O₅ compared to Aswan’s oolitic ironstones. The study confirms that massive, oolitic, and conglomeratic ironstone facies formed in a near-shore environment during transgressive–regressive cycles. By combining remote sensing with ground-based validation, the workflow supports sustainable metal technologies by improving discovery efficiency, reducing unnecessary disturbance, and strengthening the geoscientific basis for future iron resource planning.

Arsenopyrite (FeAsS) is an important sulfide that holds gold in orogenic systems. Its arsenic content is often used as a proxy for gold fertility. However, arsenopyrite from the Um Rus gold deposit in Egypt’s Central Eastern Desert shows a complicated gold distribution that makes simple Au-As correlations hard to make. Integrated electron microprobe analysis (EMPA), laser ablation ICP-MS, and principal component analysis (PCA) reveal three unique textural and geochemical domains. Fine-grained arsenopyrite inclusions within pyrite aggregates (28–31 at% As) are devoid of detectable gold; PCA elucidates 84% of their variance through Fe–S versus Co-As substitution (PC1: 61.8%) and Pb-decoupled variability (PC2: 22.2%), suggesting crystallization from a Co-rich, Au-poor fluid. On the other hand, coarse oscillatory-zoned arsenopyrite can hold up to 6154 ppm of invisible gold. This is because of a moderate Au-As substitution (R = 0.41063, p = 0.08074) that was overprinted by a separate Au-Ag-Sb-Te hydrothermal pulse (Au–Ag: R = 0.97762; Au–Sb: R = 0.97608). PCA finds four parts (72.8% variance): Ag-Cu-As associations (PC1: 25.1%), Te versus Bi-Au signatures (PC2: 17.8%), Fe–S stoichiometry (PC3: 17.1%), and an Au versus Pb-decoupled event (PC4: 12.9%). This shows that minerals formed in more than one stage. Irregular As-rich overgrowths, containing ≤950 ppm gold and lacking significant Au–As correlation (R = −0.14011, p = 0.56726), show PCA (74.3% variance) that highlights S-As contrasts (PC1: 25.2%), Co-Ni enrichment (PC2: 18.8%), Cu-Fe-Ni associations (PC3: 16.2%), and a late Au-decoupled event (PC4: 14.2%), indicating barren recrystallization. These results show that just adding arsenic is not a good way to tell if gold is fertile. The highest amounts of invisible gold, on the other hand, are found in oscillatory-zoned domains with Ag-Sb-Te signatures. This research highlights the importance of combining PCA, geochemistry, and microtextures to differentiate auriferous from barren arsenopyrite, thereby enhancing exploration methodologies for structurally intricate orogenic gold systems.