Coal Mine

"A machine that produces coal. Coal is worth $0 when put into a furnace but is used to power many heavy machines."

Overview
The Coal Mine is a common tier dropper that drops coal to fuel Industrial machines. Coal ore is worth $0 by default. It is used to power many things like the Industrial Ruby Mine, the Industrial Diamond Mine, the Industrial Osmium Mine, and the Industrial Rainbow Mine. They are often placed in large conveyor arrays, with teleporter senders at the ends to make ore transport easier.

Trivia

 * The Coal Mine's ore is not automatically destroyed upon hitting the floor of a base, making it notorious for ore limit spam at Haven Freebuild servers.
 * There is a Premium version of this dropper called the Triple Coal Mine, which drops three coal ore at once but only takes up the same space as a regular Coal Mine.
 * It takes 20-30 seconds for its ores to disappear.
 * If replicated the ore will not disappear.
 * It is located in the furnace section of the shop.
 * If the coal is put into a money adder machine (for ex. Cursed Ore Purifier) it will be worth something since the upgrader has added money to it.
 * Less messy than a Triple Coal Mine.