In the magmatic-hydrothermal environment, fluids with similar metal concentrations and sources may yield contrasting mineral assemblages in successive stages of sulphide mineralization. These differences are linked to physico-chemical conditions mineralizing (e.g., T, pH, fS2, fO2) acquired during their interaction country rocks and/or by mixing groundwater. Here, we integrate petrography osmiu...

Areal placers of diamond and precious metals (platinum gold) unknown origin are widespread in the Anabar River basin on northeastern part Siberian Platform. This article discusses typomorphic features palladium gold (porpezite) ferroan platinum, which, addition to fragmented individual grains, sometimes form close growths, which indicates their obvious genetic relationship. can be used delimit ...

Background. Although the Kuhilal deposit of Mg skarns has been thoroughly studied, tourmaline in their composition never considered [5, 6, 16]. Uvite, a variety, was mentioned list rare minerals only with its crystallochemical formula [17]. L.N. Shabynin, great connoisseur skarns, noted rarity various deposits. Tourmaline this type is characterized by strong variation ferruginosity and signific...

Iron ox ide cop per gold (IOCG) de pos its are rec og nized world-wide and in clude a num ber of world-class, high-ton nage, low-grade Cu-Au de pos its that are typ i cally hosted in in tru sive-hy dro ther mal brec cias and in clude the Mesoproterozoic Olym pic Dam (Aus tra lia) and IgarapeBahia Alemao (Brazil) de pos its (Hitzman et al., 1992). In the Ca na dian Cor dil lera, nu mer ous Mesop...