Conditions for the Gold Deposits Formation of Gold-Quartz Formation Type on the Example of the Hooglannach Ore Occurrence of the Verkhoyansk-Kolyma Folded Region

The Hooglannah ore deposit is located on Ayan-Yuryakh anticlinory territory of the Verkhoyansk-Kolyma folded region. There are unexplored gold ore manifestations of the gold-ore-quartz formation, as well as industrial and non-industrial placers of gold. The distribution area of gold mineralization within the Hooglannach ore occurrence is localized in the dyke-like body of granodiorite porphyries and in its exocontact. The host rocks are the Atkan and Omchak formations deposits of Late Permian age, collected in a brachysynclinal fold. An intrusive ore-controlling body is confined to its axial part. Rocks containing volcanogenic material take part in the structure of the host complex: tuff sandstones, tuffoaleurolites, tuffoargillites, tuffogenic mixtites, as well as la voxtites, tuffs and tuffites of andesite and dacite. The veined-interspersed type is the leading structural and morphological type of mineralization. The vein-veined type occurs rarely. Ore mineralization is represented by thin inclusions of arsenopyrite, galena, and gold, which is usually confined to dark gray stripes in the band parts of veins. The conducted mineralogical and petrographic studies have established that the rocks of the intrusive body of granodiorite porphyry accompanying the Hooglannach stock were subject to processes corresponding to high-temperature autometasomatosis and mesothermal near-crack metasomatosis by the type of berezitization. This type associated with the hydrothermal stage of gold-quartz ore formation. The multifactorial model of the Hooglannah ore occurrence was formed, based on the obtained material.