Mining is the process of extracting useful materials from the earth. Some examples of substances that are mined include coal, gold, or iron ore. Iron ore is the material from which the metal iron is produced. 

The process of mining dates back to prehistoric times. Prehistoric people first mined flint, which was ideal for tools and weapons since it breaks into shards with sharp edges.  The mining of gold and copper also dates back to prehistoric times. 

These profitable substances that are mined from the earth are called minerals. A mineral is typically an inorganic substance that has a specific chemical composition and crystal structure. The minerals are valuable in their pure form, but in the earth they are mixed with other, unwanted rocks and minerals. This mix of rock and minerals is usually carried away from the mine together, then later processed and refined to isolate the desired mineral. 

The two major categories of modern mining include surface mining and underground mining. In surface mining, the ground is blasted so that ores near Earth’s surface can be removed and carried to refineries to extract the minerals. Surface mining can be destructive to the surrounding landscape, leaving huge open pits behind. In underground mining, ores are removed from deep within the earth. Miners blast tunnels into the rock to reach the ore deposits.  This process can lead to accidents that trap miners underground. 

Along with accidents, a career in mining can also be dangerous since it can lead to health problems. Breathing in dust particles produced by mining can lead to lung disease. One of the most common forms is black lung disease, which is caused when coal miners breathe in coal dust. Many other types of mining produce silica dust, which causes a disease similar to black lung disease. These are incurable diseases that cause breathing impairment and can be fatal.

The mining process can also harm the environment in other ways. Mining creates a type of water pollution known as acid mine drainage. First, mining exposes sulfides in the soil. When the rainwater or streams dissolves the sulfides, they form acids.  This acidic water damages aquatic plants and animals. Along with acid mine drainage, the disposal of mine waste can also cause severe water pollution from toxic metals. The toxic metals commonly found in mine waste, such as arsenic and mercury, are harmful to the health of people and wildlife if they are released into nearby streams.

 

Mining
Throughout history, minerals, like copper, have been extracted from the earth for human use. It is still mined in places like this open-pit mine outside of Silver City, New Mexico, in the United States.
acid
Noun

chemical compound that reacts with a base to form a salt. Acids can corrode some natural materials. Acids have pH levels lower than 7.

acid mine drainage
Noun

flow of acid or acidic liquid from metal mines or coal mines.

archaeologist
Noun

person who studies artifacts and lifestyles of ancient cultures.

crystal
Noun

type of mineral that is clear and, when viewed under a microscope, has a repeating pattern of atoms and molecules.

extract
Verb

to pull out.

extract
Verb

to pull out.

inorganic
Adjective

composed of material that is not living, and never was, such as rock.

inorganic
Adjective

composed of material that is not living, and never was, such as rock.

mineral
Noun

inorganic material that has a characteristic chemical composition and specific crystal structure.

mineral
Noun

inorganic material that has a characteristic chemical composition and specific crystal structure.

Noun

process of extracting ore from the Earth.

Noun

process of extracting ore from the Earth.

ochre
adjective, noun

orange-yellow color.

Noun

deposit in the Earth of minerals containing valuable metal.

Noun

deposit in the Earth of minerals containing valuable metal.

prehistoric
Adjective

period of time that occurred before the invention of written records.

prospector
Noun

person who searches or mines land for precious metals.

toxin
Noun

poisonous substance, usually one produced by a living organism.