Abstract
A set of airborne dust samples from a Hemlo gold mine showed evidence of interference in the routine quartz analysis. A further study of the problem was carried out. First, on a number of field samples, there was no agreement in the quantities of quartz estimated using four diffraction lines. Second, examination of the published diffraction patterns for the common minerals in the ore showed that strong interference could he expected on all four quartz lines. Third, analysis of powder samples prepared from the four types of ore in the mine showed strong interference on one to three of the quartz lines for each type of ore and on all four lines for the four types together. Fourth, spiking of the prepared ore samples with quartz showed poor recoveries. Thus, the x-ray diffraction analysis for quartz in this type of ore is uncertain, and further work is required to develop a satisfactory analytical method. The main interfering minerals are silicates and thus are difficult to remove by chemical methods.
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