'Plant' is a general name for any machinery, equipment, appliance, implement or tool and any component, fitting or accessory. It can include things as diverse as presses in a foundry, underground drill jumbos in mining and photocopiers in an office. Mining techniques can be divided into two common excavation types: surface mining and sub-surface (underground) mining. Today, surface mining is much more common, and produces, for example, 85% of minerals (excluding petroleum and natural gas) ,including 98% of metallic ores.
In addition, mining is economically important to producing regions and countries. It provides employment, dividends, and taxes that pay for hospitals, schools, and public facilities. The economic opportunities and wealth generated by mining for many producing countries are substantial.