As much as the mining and construction industries in South Africa have been the backbone of the South African economy since the discovery of gold at the turn of the 19th century, so too have they been responsible for most work-related deaths in their employee population, due to their inherent hazardous working conditions. It is for this reason that the governing bodies of these industries have started to clamp down on safety in organisations, legislatively ensuring that all organisations adhere to comparatively stringent and austere regulations, or face possible shutdown. Internal safety communication is, therefore, not only literally a matter of life and death, but also forms part of complying with the laws of the country. Notwithstanding its importance, this inimitable form of internal organisational communication has yet to be widely researched. Positioned within this void, this study proposes the first model for internal safety communication within the context of the South African mining and construction industries, as well as a measuring instrument for its evaluation. The research into these two contributions is based on a sound and rigorous literature review, focusing on the chronological development of germane theories, onwards from the systems theory – the meta-theory of this research. Subsequently, the empirical research of the study was done at two organisations seated within the mining and construction industries of the country, and comprises interviews, focus group discussions and a questionnaire. In this way, the research took the form of a longitudinal study, in terms of the testing of the two contributions, but specifically the measuring instrument. This testing was done during the first stage of the empirical research at the Gautrain project and after the research intervention yielded from the findings of this first stage, the Abstract contributions were reworked and tested again in the second empirical stage of the research, at Diesel Power Opencast Mining. The model and the empirically tested and validated measuring instrument for internal safety communication – both for the context of the South African mining and construction industries – expand and contribute to the field of internal organisational communication in an imperative and relevant way, providing new theory from the South African context. / Communication Science / D.Litt et. Phil. (Communication)