By Greg Fenrick

The key to a successful mine includes accurate sample collection and lab analysis. Accuracy of the assay result improves the selection of ore and waste. Sampling studies show that to improve the accuracy of a blast hole assay result, the sample size must be reduced to around 2mm or less before splitting the portion to be pulverized. In a paper by Rocklabs titled Methods & Equipment for sample preparation (pdf), the last thirty years have seen three major changes in pulverizing sample preparation equipment:

  • In the 1970’s the ring and puck mill replaced the disc mill as the preferred pulverizer.
  • The 1980s saw the boom in the gold industry with more than 50% of all exploration money spent on gold, sales of the big bowl, single disc mill expanded considerably because of the desire to process larger samples.
  • In 1989, Newmont Gold’s Carlin gold mine spent millions of dollars on automating their sample preparation. A new era of mechanisation of sample preparation had begun and the trend has continued through the 1990s.

XT1000 Automatic Pulverizer - Courtesy of TM Engineering

Lab Preparation Pulverizer Manufacturers

Related Articles

Comminution Tests
SMA Paper
Reference Materials and their Applications
Options for Mechanised and Automated Systems
Methods & Equipment for sample preparation
Choice new parameter in sample prep
Mineral analysis matters