An adit is a horizontal or nearly horizontal passageway that leads into a mine. It is primarily used for accessing mineral deposits, allowing miners to enter and exit the mine safely. Adit construction often involves digging through rock to create a tunnel that can also serve as a drainage system, helping to manage water flow within the mine. Adits are important in mining operations because they provide ventilation and transportation routes for materials and equipment. They can also serve as a means of exploration, allowing miners to assess the quality and quantity of minerals, such as gold or silver, before deciding on further extraction methods.