The Sanyo Railway Company opened the Asa to Minami-Omine section in 1905 to haul coal.

The company was nationalised in 1906, and the Japanese Government Railway (JGR) extended the line to Mine in 1909.

That company was nationalised in 1920, and the JGR opened the section to Ofuku the same year.

Despite estimates that repairs would take up to three years to complete, the Mine Line was restored to full service on 26 September 2011, in time for the 66th National Sports Festival, "Oidemase Yamaguchi Kokutai," which began in October 2011.

Since June 2023, the Mine Line has been fully suspended due to rain damage from a storm.