The Frontino Gold Mines Company (FGM) is located in Segovia, in Antioquia, Colombia. The mineral transporting is made in an expensive and inefficient process where trucks are used to transport the material throughout 6.5km by ways in regulate condition, with high slopes and that go into the town of Segovia. It looks alternatives for an efficient and economical transporting process. For that, this article analyzes the technical and economic prefeasibility of a railway system to transport mineral from the Sandra­K mine to the benefit plant Maria Dama. A specialized railway system for mining characteristics is propose for transporting 300t/day within 12 hours initially with two trains of electrical locomotives dragging 14 wagons each one. At the mind time its cargo capacity increases gradually to 800t/day. The geometric railway design has a maximum speed of 20km/h, minimum radios of 20m, rail gauge of 600mm, predominant slope of 2% and the use of transition curves Clotoide type. Two alternatives are considered. The alternative A has a length of 4.4km, combining the railway system with an underground conveyor belt of 150m of length with a slope of 30o connecting the mine in its interior. The railway system presents a tunnel of 860m of length which also serves as tunnel guide for the future material exploitation. The alternative B has a length of 8km. It is totally to open sky. Costs of construction, investment, operation and maintenance are considered in 20 years. The most favorable unit cost is $ 5.386/t in the alternative A.