Collier's work is a term used to describe the job of a miner. It involves extracting minerals, coal, and other materials from the earth. The term is derived from the French word 'COLLIER' which means 'coal miner'. Miners use various tools and techniques to extract resources from the ground, including drilling, blasting, and shoveling. They also use heavy machinery such as bulldozers and cranes to move large amounts of material. Miners must be highly skilled and knowledgeable in order to safely and efficiently complete their tasks.