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In video games using procedural world generation, the map seed is a (relatively) short number or text string which is used to procedurally create the game world ("map"). "). This means that while the seed-unique generated map may be many megabytes in size (often generated incrementally and virtually unlimited in potential size), it is possible to reset to the unmodified map, or the unmodified ...
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Mine shafts are vertical or near-vertical tunnels, which are "sunk" as a means of accessing an underground ore body, during the development of an underground mine.. The shape (in plan view), dimensions and depth of mine shafts vary greatly in response to the specific needs of the mine they are part of and the geology they are sunk through.
There are two principal phases of underground mining: development mining and production mining. Development mining is composed of excavation almost entirely in (non-valuable) waste rock in order to gain access to the orebody. There are six steps in development mining: remove previously blasted material (muck out round), scaling (removing any unstable slabs of rock hanging from the roof and ...
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 (), although modern large hoists use alternating current drives that ...
This also increased the cost of the whole project (including sinking the mineshafts) from £3.6 billion to £4.2 billion. [47] The increase in diameter has also led to a slower progress rate than before; the TBMs tunnelling would be reduced from covering 66 feet (20 m) to 56 feet (17 m) per day. [48]
Lake Superior Iron Ranges The headframe for shaft #8, still in active use today. In the late 19th century, prospectors searching for gold in northern Minnesota discovered extremely rich veins of hematite at this site, often containing more than 65% iron.
The Lucky Friday mine is an underground silver, lead, and zinc mine in the western United States, near Mullan, Idaho. [2] Operated by Hecla Mining company, it is one of the few mines remaining operational in the Silver Valley of northern Idaho, producing 1000 tons of ore per day.