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Prototype borehole miner selectively extracts gold from permafrost
  • Published Date:
    July 1997
  • Language:
    English
Filetype[PDF-248.24 KB]


Details:
  • Corporate Authors:
    Pittsburgh Research Laboratory (National Institute for Occupational Safety and Health)
  • Description:
    "Assess the technical feasbility of mining small and/or deeply buried frozenplacer deposits from the surface through boreholes. Placer deposits in permafrost often contain up to 15% cobbles and boulders. Because of erratic loading on the bit caused by elasticity and heterogeneity of the ice-and-gravel matrix, these deposits are extremely difficult to excavate. The approach taken in this research project was to mine only the ore-bearing portion of the deposit using a high-pressure water jet to thaw the gravels and a downhole hydraulic-lift-type pump to bring the ore to he surface as slurry. Full-scale jetting tests in frozen gravel were completed, and the data were used to design a jet excavator. The excavator will deliver a water flow of 890 L/min through a 15.7 mm diam nozzle at 6,900 kPa. The prototype slurry pump was designed to lift minus 15 cm gravels to the surface from a depth of 15 m." - NIOSHTIC-2

    NIOSTHTIC no. 20000466

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