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Asian Gold reserves DB
Birkachan Gold Mine (Russia)
      paishanlou gold mine (china)
      gaolong gold mine (china)
      ..................
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اولينقبليبعديآخرين
   Regional Geology
  
   Birkachan is situated in the lower third of the uplifted Omolon massif north of the Cretaceous Othotsk - Chukotka mobile belt. It lies directly on the north south line of the Verkhalam gold silver mineralization trend inferred to extend from Evensk on the Othotsk coastline and Sopka Kvartsevaya to Tumanni - Malavodny in the north. It has similarities to Kubaka in that it’s main host stratigraphy is upper Devonian rhyolites and rhyodacites. Tectonically it lies
   protected on the footwall side or north of regional northeast striking Cretaceous thrusts, and on the perimeter of the Munugudjak Jurassic volcanotectonic depression or basin. Main gold bearing structures (northeast strike) are radial to the basin center same as Kubaka (northwest strike). Barren lower Carboniferous Korba shale caprock have provided erosional protection for both Birkachan and Kubaka. Regional gabbroic – diorite –syenitic sills intruding along Korba carbonaceous strata also provided protection cover and often form the distal mesa-like hills. Proto- or low grade ore mineralization appears to be of late Devonian age while clock resetting due to late local enrichments dates to late Jurassic – early Cretaceous, similar to the Munugudjak volcanic calderic basin collapse and Labazny granodioritic stock intrusion.
  

Geology & mineralization map of Birkachan Region
    Rhyolites are buff fine grained and welded with numerous 10% – 30% heterolithic lapilli to pyroclastic fragments of adjacent units. The marker unit is an off white fine grained more uniform unit.
   Gritstone units contain 40 – 60% angular to subangular heterolithic pyroclastic clasts > 5 mm in a matrix of tuffaceous sandstone.
   Tuff sandstone units are coarsely to finely banded intercalated sandstone to siltstone units of predominantly quartz, feldspar, yellow green sericite (hydromica) tuffaceous (volcanogenic) grains/crystals.
  
  
 
 
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