small diameter drilling
31Well — is a mining tunnel of a round hole in diameter many times less than its length, which is formed in a rock mass by means of drilling and casing without people access with a pre designated 3D position. The upper part of a well is called a wellhead …
32Cave digging — is the practice of enlarging undiscovered cave openings to allow entry. Cave digging usually follows a search of mountains and valleys in karst topography for new caves. Often it takes place underground in places where a large passage has clearly …
33Rotary tiller — A rotary tiller, also known as a rototiller, rotavator, rotary hoe, power tiller, or rotary plough (in US: plow), is a motorised cultivator that works the soil by means of rotating tines or blades. Rotary tillers are either self propelled or… …
34Auger — An auger is a device for moving material or liquid (see Archimedes screw) by means of a rotating helical flighting. The material is moved along the axis of rotation. For some uses the helical flighting is enclosed in a tube, for other uses the… …
35tungsten processing — Introduction preparation of the ore for use in various products. Tungsten exhibits a body centred cubic (bcc) crystal lattice. It has the highest melting point of all metals, 3,410° C (6,170° F), and it has high conductivity for… …
36Compressed Air Foam System — A Compressed Air Foam System for hand hose, abbreviated CAFS, is a system used in firefighting to deliver fire retardant foam for the purpose of extinguishing a fire or protecting unburned areas from becoming involved in flame.DescriptionRon… …
37Compressed air foam system — A fire engine using CAFS to make foam on the ground A compressed air foam system (CAFS) is a system used in firefighting to deliver fire retardant foam for the purpose of extinguishing a fire or protecting unburned areas from becoming involved in …
38bore — I. /bɔ / (say baw) verb (bored, boring) –verb (t) 1. to pierce (a solid substance) or make (a round hole, etc.) with an auger, drill, or other rotated instrument. 2. to force by persistent forward thrusting. 3. Horseracing to push aside… …
39tunnels and underground excavations — ▪ engineering Introduction Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …
40Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …
