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Asian Gold reserves DB
ad duwayhi Gold Mine (Arabia)
      paishanlou gold mine (china)
      gaolong gold mine (china)
      ..................
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  Page 162
 
اولينقبليبعديآخرين
   Exploration perspectives
   Several gold prospects require additional work, in particular geochemistry on pit or shallow auger/R.C-drill samples to look below the eolian sand, and resistivity, in order to increase the reserves of this very promising district.
   The nickel-rich parts of the gabbro intrusion of Jabal Jedair should be reanalyzed for PGE.
   Mineralization styles, in the following general paragenetic sequence, include (1) quartz-molybdenite veins in and near the granite stock, (2) low-grade gold-bearing quartz vein breccia in and along the margins of the granite stock, (3) gold-bearing stockwork and sheeted quartz veins, and (4) massive to banded gold-rich tabular quartz veins. The gold-bearing stockwork, sheeted, and tabular veins are generally spatially associated with square quartz porphyry dikes and more distal to the granite stock. Mineralized zones at Ad Duwayhi are characterized by low sulfide and base metal content and gold/silver ratios of approximately 6/1. Gold shows no significant correlation with other metals, except lead, and moderate correlation with silver.
  

View of driling cores of this mine
    Re-Os dating of molybdenite from a quartz-molybdenite vein and a tabular quartz vein with cogenetic gold produced robust ages of 655.6 ▒ 2.7 and 649.9 ▒ 2.3 Ma, respectively, documenting that gold mineralization and crystallization of granite and square quartz porphyry were, within uncertainty, coeval events. This age correlation combined with granite textural features, the presence of unidirectional solidification textures in granite and square quartz porphyry, and the nature and time-space distribution of mineralization styles, all indicate that mineralization evolved in and near the interface between a crystallizing magma and the surrounding rocks and, thus, is consistent with an intrusion-related genesis.
  
  
  
 
 
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