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. The Mine Light Railway Company opened the Mine to Shigeyasu section in 1916. That company was nationalised in 1920, and the JGR opened the section to Ofuku the same year. The line was extended to Nagato in 1924, completing the line. Freight services ceased in 1984, except for
limestone haulage from Shigeyasu, which ceased in 2009. All services were suspended after heavy rainstorm flooding in July 2010. In May 2025, JR West announces that its preferred option for restoration of the Mine Line is conversion to BRT. Mine City still prefers restoration of the line as a railway. On August 7, 2025, JR West,
Yamaguchi Prefecture,
Mine City,
Sanyo Onoda City, and
Nagato City agreed to abandon restoration of the railway line and to convert the Mine Line to BRT. ==Stations==