Vitrinite reflectance depends not only on chemical maturation of the vitrinite, but also on the moisture content, which is an indication of its physical maturation. Thus, vitrinite reflectance alone cannot be regarded as a definitive parameter of maturation.

The mineralogy and textures of specimens from a sulphide occurrence in a green schist at Waitahuna River are described, and their origin is discussed. The ore minerals are chalcopyrite, pyrite, marcasite, pyrrootite, and minor sphalerite, and there is a small amount of supergene alteration. Marcasite, and the later of two main types of pyrite, are believed to have formed from pyrrhotite after the main stage of metamorphism, but are not supergene.The occurrence is thought to be a stratiform volcanic-sedimentary deposit, but the textures are mainly of metamorphic origin. Mineralogy, geological environment, and probably origin, are similar to those of the occurrence at Moke Creek, near Queenstown.