sentences:  Following this, the geology of the mine must be analysed, as this will determine factors like the lifespan of the mine, the production requirements, and the cost to develop and maintain.Next, mine layout should be determined, as factors like ventilation, electrical power, and haulage of the ore must be considered in cost analysis.Due to the non-homogeneous nature of mineral deposits typically mined by room and pillar, mine layout must be mapped very carefully.