Ore Hardness Testing -SAG Mill Tonnage Estimation Method

For design purposes, you need an estimation or prediction of your SAG Mill’s tonnage; well, there are 3 ways to generate good rock “ore” hardness testing data for SAG and ball mill circuit grindability from half drill core.  We can abbreviate the discussion by saying there are three “religions” of grinding, and there are small-scale tests suitable for all three of the major religions of ore hardness measurement. The first and cheapest method is also the most widely available method, based on the Bond work index series and models based on the work of people like Derek Barratt.  This “Bond religion” typically costs less than $1200 per sample and you should be able to get steep discounts by obtaining a competitive bids.  Labs like ALS Global (Kamloops formerly G&T), SGS in Canada and Chile, Hazen, Corem, Dawson, Metso and TOMS can do this suite of testing.  The Barratt form of this “religion” is calibrated principally to porphyry deposits, but I am also using it on iron deposits and think it works well there, too. Avoid doing Bond work index tests at Australian labs as their geometry of work index rod mills is different from the geometry at the labs listed above.  There are Australian … Continue reading Ore Hardness Testing -SAG Mill Tonnage Estimation Method