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The miner's cap ( German: Fahrhaube) is part of the traditional miner's costume. It consists of a white material (linen) and served in the Middle Ages to protect the miner when descending below ground ( unter Tage ). Later it was replaced by the miner's hat ( Fahrhut or Schachthut ), from which the leather cap or helmet were developed and ...
A hard hat is a type of helmet predominantly used in workplace environments such as industrial or construction sites to protect the head from injury due to falling objects, impact with other objects, debris, rain, and electric shock. Suspension bands inside the helmet spread the helmet's weight and the force of any impact over the top of the head.
Construction worker wearing an MSA Skullgard hard hat at Douglas Dam, Tennessee (), 1942. Mine Safety Appliances, or MSA Safety Incorporated, is an American manufacturer and supplier of safety equipment designed for use in a variety of hazardous conditions in industries such as construction, the military, fire service, and chemical, oil, and gas production.
Caterpillar Inc. Caterpillar Inc., also known as Cat, is an American construction, mining and other engineering equipment manufacturer. [ 6] The company is the world's largest manufacturer of construction equipment. [ 3][ 7][ 8] In 2018, Caterpillar was ranked number 73 on the Fortune 500 list [ 9] and number 265 on the Global Fortune 500 list ...
A 3D diagram of a modern underground mine with shaft access. Underground hard-rock mining refers to various underground mining techniques used to excavate "hard" minerals, usually those containing metals, [ 1] such as ore containing gold, silver, iron, copper, zinc, nickel, tin, and lead. It also involves the same techniques used to excavate ...
Underground soft-rock mining is a group of underground mining techniques used to extract coal, oil shale, potash, and other minerals or geological materials from sedimentary ("soft") rocks. [ 1] Because deposits in sedimentary rocks are commonly layered and relatively less hard, the mining methods used differ from those used to mine deposits in ...
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