The stability of the certified reference ores MP-1 KC-1 and SU-1 towards air oxidation

The stability of three certified reference sulphide ores, MP-1, KC-1 and SU-1, towards air oxidation has been measured at 50 degrees and 40, 62 and 82% relative humidity, and at 62% relative humidity and 34 degrees and 67 degrees . Both the relative humidity and temperature affect the rate of oxidation but their relative importance depends on the mineralogical composition of the ore. Changes in the water-extractable metals and elemental sulphur content on oxidation have been determined. It is concluded that these ores may be stored safely in sealed bottles under normal laboratory conditions.