From and after the passage of this act it shall be the duty of the individual, owner, operator president, director, general manager, superintendent, or other person, in charge of, or having supervision over, any anthracite coal mine or mining operation, upon and after reasonable notice and demand, to furnish and sell at reasonable and current or market rates and prices and at reasonable times such amount of anthracite fuel coal as shall be reasonably necessary for the proper heating of any hospital, poorhouse, or other charitable institution, school building, church, or place of religious worship, or public building, municipal or quasi municipal in character, located within the limits of the municipality in which said coal mining operation is conducted or carried on: Provided, however, That said owner or operator of said anthracite coal mine or mining operation may demand that said coal so furnished be paid for at the mine or coal pocket where said coal is furnished or delivered.