Outline of mining explained
The following outline is provided as an overview of and topical guide to mining:
Mining - extraction of valuable minerals or other geological materials from the earth, usually (but not always) from an ore body, vein or (coal) seam. Any material that cannot be grown from agricultural processes, or created artificially in a laboratory or factory, is usually mined.
Basic concepts
See main article: Mining.
Geology of mining
Basic terms
- Mineral
- Rock (geology), an aggregate material usually made up of a number of minerals
- Ore, rock containing a desired mineral
- Ore genesis, the geological processes by which ore is formed and deposited
- Ore grade, the amount of a desired mineral or metal that a quantity of ore contains
- high grade ores are rich in the mineral desired, low-grade ores have less of the mineral desired
- Gangue, minerals within the ore that are not desired; these are removed during ore processing
- Vein (geology) a geological formation that often contains ore
- Overburden, the material on top of a given mineral deposit (in surface mining, it has to be removed)
Finding ore
Materials mined
Some examples of materials that are extracted from the earth by mining include:
Types of mining and techniques
Surface mining
- Surface mining, mining conducted down into the ground, but with the sky open above
- Open-pit mining, where the overburden is removed and put in a different location, leaving a large pit at the end.
- Strip mining, where the overburden is stripped off and placed onto the area where the mineral (usually coal) has already been mined out, allowing the surface to be returned to roughly how it was before
- Mountaintop removal mining, where the overburden on a mountain is pushed off the mountain into the adjacent valley
- Quarrying
- Placer mining
- Dredging
- Hydraulic mining, using high-pressure jets of water to blast soil or hillsides apart
Underground mining
- Sub-surface mining, mining conducted underground
- Two main types of underground mining, classified by the characteristic of the rock being mined:
- There are three directions by which an underground mine may be conducted:
- Drift mining, mining horizontally
- Shaft mining, mining vertically
- Slope mining, mining at an inclined angle
- Stoping is the process of extracting out the ore from underground, leaving a hole called a stope
- Room and pillar
- Longwall mining
- Retreat mining
- Fire-setting, a method used in stoping by setting fires to timber and letting the resulting collapse break up the rock
Other methods
Mining equipment
Excavation
Heavy machinery
- Steam shovel, used from the 19th century to the 1930s
- Power shovel, derived from the steam shovel, but using electricity instead of steam
- Excavator, derived from the steam shovel, but using hydraulics or pneumatics instead of steam
- Draglines use buckets attached to long cable lines, rather than affixed to a beam
- Bucket-wheel excavator, the largest moving land machines ever built
- Dredge
Blasting
Rock blasting
- Explosives
- Gunpowder or black powder, used from the 17th century to the mid-19th century
- Dynamite, used from the mid-19th century into the 20th century, still used some today
- ANFO, used from the 20th century, and the primary explosive in use today
- Blasting gear
- Detonator, a small explosive charge used to set off the main explosive
- Blasting machine, a device used to generate or send an electric charge to the detonators
Transport
- Vertical equipment
- Equipment for transporting miners
Engines used in mining
Liquid mining
Safety and environment
Processing
- Ore dressing
- General methods of ore processing
- Methods peculiar to gold placer mining. Gold is much denser than many other minerals, various methods use this to separate it out:
- Extractive metallurgy
Mining waste
- Spoil tip, a pile where overburden is placed (which has NOT been processed)
- Tailings, waste mineral material (gangue) leftover AFTER processing
- Slag, material left over from smelting
- Acid mine drainage, liquid leached out of mines
Mining hazards and safety
Geography of mining
Mining, by country
Mining of specific minerals, by country
History of mining
Economics of mining
Future of mining
People associated with mining
- miner, is a person who is involved in the act of mining
- prospector, a person who is expert in searching for and assessing the value of
Mining scholars
Organizations
Leaders and innovators in mining
See also
External links
