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Asian Gold reserves DB
Longos Gold Mine (philippines)
      paishanlou gold mine (china)
      gaolong gold mine (china)
      ..................
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اولينقبليبعديآخرين
   The Longos Mine consists of the Longos/Tomex Vein, the Longos East Extension, the ACR/LC Vein and the Contact Vein, and currently has proven and probable ore reserves of 1,900,000 tonnes and an anticipated mine life of over 10 years. Active mining operations are underway on several levels to a depth of 240 m. The development of the Mainshaft to a depth of 500 m is required to fully access these ore reserves and to satisfy future production requirements.
   The Paracale Gold District is essentially underlain by an ultramafic complex which has been metamorphosed into serpentinite and talc schist by the intrusion of quartz diorite stock (Paracale Granodiorite). The granodiorite stock was emplaced laterally along a strong structural weakness within the ultramafics. Flow patterns and mineralogical differences within the stock indicate that emplacement occurred in pulses, with the later pulses pushing against the earlier, partly solidified portions. The quartz diorite intrusive is host to several economically significant mineralized zones.

Hoist buildings
    The Mainshaft flooding was a direct result of grouting methods and procedures which were inappropriate to site conditions. Grout holes were not flushed clean of drilling debris and mud infillings, nor was water pressure testing undertaken. The holes were grouted to full depth in one pass, rather than using a stage down drilling and grouting technique. Grout injection pressures were too high (1000 - 2000 psi) for the weak, highly-fractured ground conditions.
   The use of excessive grouting pressures further weakened the rock formation adjacent to the shaft and caused the shaft bottom to blow out. Seawater entered the shaft and rose at the rate of 12 m per hour until the shaft had filled to sea level. Recovery efforts were attempted for the following three months and consisted of drilling and grouting along the shoreline adjacent to the Mainshaft, as well as dewatering
   two adjacent shallow shafts. These operations were virtually shots-in-the-dark and did not have any effect on the water inflow at the shaft bottom.
  
 
 
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