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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 subsequently today's mining helmets .
Easily shaped with heat, it is cost-effective to manufacture. In 1952, MSA offered the Shockgard Helmet to protect linemen from electrical shock of up to 10,000 volts. In 1961, MSA released the Topgard Helmet, the first polycarbonate hard hat. 1962 brought the V-Gard Helmet, which today is the most widely used hard hat in the United States.
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Throughout the world, there are different titles for mine carts. In South Africa, a minecart is referred to as a cocopan; [1] or koekepan. In German, it is called Hunt (alternative spelling Hund). In Wales, minecarts are known as drams. [2] In the U.S. and elsewhere, the term skip – or skip wagon (older spelling: waggon) – is used. [3]
Headframe of the #1 Shaft at Oyuu Tolgoi. A steel headframe is less expensive than a concrete headframe; the tallest steel headframe measures 87 m. [4] Steel headframes are more adaptable to modifications (making any construction errors easier to remedy), and are considerably lighter, requiring less substantial foundations.
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A drum hoist (steel wire rope visible) and motor. In underground mining a hoist or winder [1] is used to raise and lower conveyances within the mine shaft.Modern hoists are normally powered using electric motors, historically with direct current drives utilizing Ward Leonard control machines and later solid-state converters (), however modern large hoists use alternating current drives that ...
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