EPD + HMC separation

Keyword Definition

Bedrock samples are disaggregated using a custom built CNT Spark-2 electric pulse disaggregator (EPD) instead of a conventional rock crusher to preserve natural grain sizes, texures and shapes.  The sample is placed in a metal chamber that is then filled with water and sealed. The rapid scattering of electric pulses through the sample leads to explosions, which occur preferentially along grain boundaries, the natural zones of weakness in a rock sample.  The explosions along grain boundaries result in liberated individual, undamaged mineral grains that are recovered in their original shape and form regardless of grain size.  Weights are recorded, as follows:

  • initial sample weight ( = sum of retained and EPD splits)
  • retained split
  • EPD split (up to about 650 grams)
  • Total post-disaggregation weight, taken after micropanning – usually a few grams less than the EPD split weight ( = sum of > 2mm and < 2mm post-disaggregation weights)
  • > 2mm post-disaggregation weight
  • < 2mm post-disaggregation weight

The < 2mm size fraction is suitable for processing according to standard heavy mineral concentration methods.

Category: Sample preparation procedures

Keywords corresponding to sample preparation procedures. Taken from the “Sample_Preparation_Methodss_SHARED” database table.

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