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Mining Publication: Technology News 460 - Prototype Borehole Miner Selectively Extracts Gold from Permafrost
Keywords: Boreholes Excavators Gold Placer mining Pumps 
 Water jet mining
Original creation date: July 1997
Authors: GA Savanick, AL Miller
Technology News - July 1997
Download PDF Document (0.24 MB)
NIOSHTIC2 Number: 20000466
U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Technology News 460, 1997 Jul; :1-2
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.
Image of publication Technology News 460 - Prototype Borehole Miner Selectively Extracts Gold from PermafrostTechnology News - July 1997
Download PDF Document (0.24 MB)
NIOSHTIC2 Number: 20000466
U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Technology News 460, 1997 Jul; :1-2
See Also
Cableless Electronic Surveying Systems for Horizontal Holes
Comparison of Rotary and In-Hole Motor Techniques for Drilling Horizontal Boreholes in Coal
Correlation of Sonic Travel Time to the Uniaxial Compressive Strength of U.S. Coal Measure Rocks
Demonstration of Remote Mine Seal Construction
Detecting Strata Fracturing and Roof Failures from a Borehole Based Microseismic System
Discharge Water Handling and Treatment: Problems and Solutions at a Large Pittsburgh Seam Coal Mine
Effects of Stimulation Treatments on Coalbeds and Surrounding Strata: Evidence from Underground Observations
Removing Methane (Degasification) from the Pocahontas No. 4 Coalbed in Southern West Virginia
Transport of Total Tailings Paste Backfill: Results of Full-Scale Pipe Test Loop Pumping Tests
Use of Vertical Boreholes for Assisting Ventilation of Longwall Gob Areas
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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