This special industry deals with extraction of solids, such as coal and ores or liquids, such as crude petroleum, and gases, such as natural gas.

The term "mining" is used in the broad sense to include quarrying, well operations, milling and other preparation customarily done at the mine site. It engages in exploration for minerals, development of mineral properties and mining operations. Ontario's leading-edge mine supply and service sector employs more than 40,000 people and has an estimated direct economic impact of $6.6 billion. There are approximately 900 mining supply and service companies in Ontario.