Search results
Results from the WOW.Com Content Network
Example of a mine gallery with timber roof support. In siege warfare, tunnelling is a long-held tactic for breaching and breaking enemy defences.The Greek historian Polybius, in his Histories, described accounts of mining during Philip V of Macedon's siege of the town of Prinassos; there is also a graphic account of mining and counter-mining at the Roman siege of Ambracia.
This list of deepest mines includes operational and non-operational mines that are at least 2,224 m (7,297 ft), which is the depth of Krubera Cave, the deepest known natural cave in the world. The depth measurements in this list represent the difference in elevation from the entrance of the mine to the deepest excavated point.
The Kola Superdeep Borehole SG-3 (Russian: Кольская сверхглубокая скважина СГ-3, romanized: Kol'skaya sverkhglubokaya skvazhina SG-3) is the deepest human-made hole on Earth (since 1979), which attained maximum true vertical depth of 12,262 metres (40,230 ft; 7.619 mi) in 1989. [1]
The deepest mines in the world are the Mponeng and TauTona (Western Deep Levels) gold mines in the Witwatersrand region of South Africa, which are currently working at depths exceeding 3,900 m (12,800 ft). [13] The deepest inactive mine in Asia is the Kolar in the Karnataka region of India. Closed in 2001, the main shaft had reached a depth of ...
Deep mines were not required at first, so a large number of small operations sprang up. There was a complex legal system for concessions, and often multiple layers had different owners. Entrepreneurs started going deeper and deeper, thanks to the good pumping system. In 1790, the maximum depth of mines was 220 meters (720 ft).
AOL latest headlines, entertainment, sports, articles for business, health and world news.
Several underground explosive charges were fired during the First World War at the start of the Battle of Messines (7–14 June 1917).The battle was fought by the British Second Army (General Sir Herbert Plumer) and the German 4th Army (General Friedrich Sixt von Armin) near Mesen (Messines in French, also used in English and German) in Belgian West Flanders.
Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.