An adit is a horizontal or nearly horizontal passageway that is dug into the side of a mountain or hill. It is primarily used in mining to access mineral deposits, allowing miners to extract resources more efficiently. Unlike vertical shafts, adits provide a more direct route for transporting materials and can also facilitate ventilation in underground operations. Adit construction involves careful planning and engineering to ensure stability and safety. They can vary in size and length, depending on the specific mining operation and the geology of the area. Adit systems are often connected to other underground tunnels and shafts, enhancing the overall efficiency of the mining process.