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Encyclopedia > Borehole mining

Borehole Mining (BHM) is a remote operated method of extracting (mining) of mineral resources through boreholes by means of high pressure water jets. This process can be carried-out from land surface, open pit floor, underground mine or floating platform or vessel through pre-drilled boreholes. The El Chino Mine located near Silver City, New Mexico is an open-pit copper mine This article is about mineral extraction. ... Water borehole in northern Uganda A borehole is a deep and narrow shaft in the ground used for abstraction of fluid or gas reserves below the earths surface. ... Italian ship-rigged vessel Amerigo Vespucci in New York Harbor, 1976 A ship is a large, sea-going watercraft, usually with multiple decks. ...

Contents


The process

  1. A borehole is drilled from land surface to a desired depth, where then an actual borehole mining will take a place.
  2. A casing column is lowered down the hole. Since BHM takes place in an "open hole", the casing shoe is located just above the upper border of the production interval (ore body) leaving the rest open.
  3. The BHM tool is lowered into the hole.

A drill is a tool with a rotating drill bit used for drilling holes in various materials. ... Iron ore (Banded iron formation) Manganese ore Lead ore Gold ore An ore is a volume of rock containing components or minerals in a mode of occurrence which renders it valuable for mining. ...

Description of a BHM tool

The tool consists of at least two concentric pipes which are forming two hydraulic channels - one for pumping down a high-pressure working agent (water) and second for delivering pregnant slurry back to the surface. A BHM tool usually has (down-up): an eductor (waterjet pump) section, a hydromonitor section, an extension section and a hub, connecting it all to a drill pipe string. This string extends the tool up to the surface. Above the surface, the tool has a swivel allowing its suspension and rotation in a hole, and also connections to the working agent supply (pump station) and a slurry collector. A drill rig is normally required to operate a BHM tool. Concentric objects share the same center or origin. ... The word pipe can refer to: The basic cylindrical pipe shape a tubular man-made channel, generally round in cross section, in steel or concrete for transporting or guiding a fluid substance see plumbing and pipeline transport used in construction as column, truss element or space frame in mechanical engineering... Hydraulics is a branch of science and engineering concerned with the use of liquids to perform mechanical tasks. ... Water (from the Old English waeter; c. ... A slurry is a sloppy mixture, which comes in different varieties: Metal Slurry can be used in pipe fitting and other welding tasks, as well as slurry based bombs like the BLU-82. ... Flour suspended in water In chemistry, a suspension is a colloidal dispersion (mixture) in which a finely-divided species is combined with another species, with the former being so finely divided and mixed that it doesnt rapidly settle out. ...


The tool is lowered into a well until the hydromonitor reaches the required depth where the actual borehole mining is started. Then the high-pressure water is pumped down and receives back productive slurry. In the collecting pond or tank, slurry is separated and clarified water is pumped down for re-circulating. Well drilling is the process of drilling a hole in the ground either for exploration of the nature of the material underground or for the extraction of a natural resource such as water, natural gas, or petroleum. ...


While extracting of material, different shape underground caverns could be created. Their shapes depend on the BHM tool manipulation while mining, which obviously consist of the tool rotation, sliding it up and down and combination of these two movements. Borehole mining is applied from vertical, horizontal and deviated wells. Alternate meanings: Cave (disambiguation) The outside world viewed from a cave A cave is a natural underground void. ...


Advantages of BHM

The main advantages of BHM include its low capital cost, mobility, selectivity, ability to work in hazardous and dangerous conditions and low environmental impact. The method has been used in mining of such natural resources and industrial materials as: uranium, iron ore, quartz sand, gravel, coal, poly-metallic ores, phosphate, gold, diamonds, rare earths, amber and several more. Borehole mining is also used in exploration, oil, gas and water stimulation, underground storage construction and drainage. In politics, a capital (also called capital city or political capital — although the latter phrase has an alternative meaning based on an alternative meaning of capital) is the principal city or town associated with its government. ... General Name, Symbol, Number uranium, U, 92 Chemical series actinides Group, Period, Block n/a, 7, f Appearance silvery gray metallic; corrodes to a spalling black oxide coat in air Atomic mass 238. ... In inorganic chemistry, a phosphate is a salt of phosphoric acid. ... Amber pendants. ... Natural olive oil Synthetic motor oil Oil is a generic term for a chemical compound that is not miscible with water, and is in its liquid state at common ambient temperatures. ...


External link

  • - Learn more on borehole mining

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