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Asian Gold reserves DB
Sukhaybarat Gold Mine (Arabia)
      paishanlou gold mine (china)
      gaolong gold mine (china)
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  Page 164
 
اولينقبليبعديآخرين
   Mineralization
   The Sukhaybarat-Silsilah district contains over 40 gold occurrences where silver is subordinate. These are generally installed on shear-zones and hosted , either by Murdama volcano-sediments, or by post-Murdama intrusives of the Idah suite. Some Cu-Mo porphyries also occur in this context, as does the Mibari Cu-Au prospect (E. Jaques, A. Al Jehani 1998) or the zoned Silsilah greisen intrusive with tin mineralization.
  
   Gold mineralization in shear zones
   Gold mineralization in shear zones is found in extensional fractures related to shear-faulting. The hostrock is either an intrusive whose emplacement was related to the structural movement, or a metasedimentary rock that was affected by the thermal halo around the intrusion. Biotite hornfels occurs up to 100 m distant from the intrusion and is marked by a negative ground-magnetic anomaly.
  

Location map of Sukhaybarat Gold mine in Region
    Gold mineralization in intrusive rocks
   Sukhaybarat mine was discovered as the result of a systematic re-evaluation of old workings. The mine, which is now almost worked out, will have produced 21 tons of gold from ore grading on average 2.5 g/t Au
   The gold occurs in en echelon fractures filled with quartz with arsenopyrite and pyrite, and traces of chalcopyrite and galena. Alteration with actinolite, pyrite, sericite, chlorite, arsenopyrite, and carbonates affects the walls over 30-40 cm. Gold grades in the walls are significant at 0.5-1 g/t. Geochemically, the alteration stands out through a clear increase in K2O, CaO, MgO, and CO2, and a decrease in Na2O
  
  
 
 
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