In addition to NiS collection fire assay for a five element PGM suite, the samples will undergo research quality analyses for a wide range of elements, including the large ion. , the rare earth elements, high field strength elements, sulphur and selenium.hey include 55 elements of the periodic system: O, Si, Al, Ti, B, C, all the alkali and alkaline-earth metals, the halogens, and many of the rare elements.