A miner is a person who works underground or in open pits to extract valuable materials from the earth. Miners dig for coal, gold, silver, copper, diamonds, and other minerals that we use to make everything from jewelry to smartphones to the electricity that powers our homes.

Mining is dangerous, difficult work. Miners often work deep beneath the surface in dark tunnels, using specialized tools and equipment to break rock and bring minerals to the surface. Coal miners once worked by candlelight, and many mines today still require workers to wear helmets with attached lights. Modern miners use powerful drills, explosives, and massive machines, but the work remains physically demanding and requires great courage.

Throughout history, miners have played a crucial role in building civilization. The California Gold Rush of 1849 brought thousands of miners west, hoping to strike it rich. Coal miners powered the Industrial Revolution by providing fuel for factories and trains. Today's miners extract the rare metals needed for computers, batteries, and medical equipment.

The word can also describe someone who searches for something valuable, like a data miner who searches through large amounts of information to find useful patterns.