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Public Chat broadcasts text to players in the local area on one server, both by text appearing above the speaker's head and in the message box. Friends Chat broadcasts text in the message box only to certain players tuned into a specific channel, who can be available on any RuneScape world. Each Friends Chat channel has an owner, who can assign ...
After the pillars are removed, the roof (or back) is allowed to collapse behind the mining area. Pillar removal must occur in a very precise order to reduce the risks to workers, owing to the high stresses placed on the remaining pillars by the abutment stresses of the caving ground. Retreat mining is a particularly dangerous form of mining.
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 ...
Similarly, some traverses and slopes may be roped for safety, particularly if organized groups are taken into the mine. Mine exploration shares some interests with Urban Exploration, primarily that of gaining access to abandoned or sometimes restricted locations. Mine explorers share an unspoken code of ethics, that of leaving sites in the same ...
Portable magnetic-loop cave radios have been used by cavers for two-way communication and cave surveying since the 1960s. [1] In a typical setup the transmitting loop, consisting of many turns of copper wire, is oriented horizontally within the cave using a spirit level, and driven at a few kHz. Though such a small antenna is a very poor ...
For some games, grinding is an integral part of the gameplay and is required if the player wants to make significant progress. In some cases, progression may be entirely negated if the player does not grind enough, for example an area necessary for the story may be locked until a certain action is repeated a certain amount of time to prove the experience of the player.
Boxwork in Wind Cave, South Dakota. In geology, boxwork is defined as a honeycomb-like structure that can form in some fractured or jointed sedimentary rocks. If the fractures in the host rock are mineralized, they can become more resistant to weathering than the surrounding rock, and subsequent erosion can produce boxwork structures.
Ellison's Cave is a pit cave located in Walker County, on Pigeon Mountain in the Appalachian Plateaus of Northwest Georgia. It is the 12th deepest cave in the United States and features the deepest unobstructed pit in the continental US, named Fantastic Pit. The cave is over 12 miles (19.31 km) long and extends 1063 feet (324 m) vertically. [1]