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The implementation of sensor systems to monitor mine ventilation atmospheres offers numerous safety and operational benefits to mines.Detection of dangerous gases, changes to airflows and temperature, and detection of clearance of fumes or contaminants are some of the obvious benefits of using atmospheric sensors in mines.The prediction of atmospheric conditions between sensors however is potentially difficult, and to gain complete coverage a mine will require either many sensors or a method of extrapolating and predicting atmospheric conditions between and downstream from a sparser array of sensors.A transient simulation computer model technique is demonstrated to predict the time based changes to atmosphere downstream from sensors.The transient model predicts the time based changes to conditions throughout a mine model, displaying current conditions in a three dimensional model by simulating the mixing,addition and dilution of gases and airflow changes in incremental time steps.The advantages of this method is that a real time overview of full mine atmospheric conditions can be viewed at all locations, even areas without sensors.In addition, with careful planning and consideration of potential contaminant sources, the number of required sensors can be minimised.