The phosphate zone is between 232 and 250 feet below land surface and consists of approximately equal proportions of finegrained phosphate, sand, and clay. Research on one borehole hydraulic coal mining system. Prototype borehole miner selectively extracts gold from pemafrost. A bhm tool consists of water jet pump, hydro monitor section, an extension section and a hub. This tool used a water jet to fragment rock adjacent to a borehole, and a down hole slurry pump to lift the ore slurry to the surface.
Borehole stability technology includes chemical as well as mechanical methods to maintain a stable borehole, both during and after drilling. This paper presents a case study of hydraulic borehole coal mining. Preparation of a new borehole sealing material of coal seam. Each miner cuts a long, horizontal passage approximately 0. Monitored drill performance data are correlated with those from borehole geophysical logging on mine benches. It is also used in exploration, oil, gas, and water stimulation. It is a remote controlled method of underground mining. Rf is the radius of the fragmentation region of each blasthole. Selection of technological parameters in borehole mining.
Economic evaluation of borehole and conventional mining. Borehole mining bhm is a remote operated method of extraction of mineral resources through boreholes based on insitu conversion of ores into a mobile form slurry by means of high pressure water jets hydraulicking. Introduction and use of the borehole camera in miningrelated. An experimental mining project was conducted in northeast st. The prototype borehole placer miner is shown schematically in figure 1.
Borehole mining article about borehole mining by the. Timah persero tbk has conducted a research and developed a borehole. In addition, current boreholesealing devices do not have a secondary boreholesealing functionality. Boretrak provides an easy way to audit drilling activity accurately and in a wide range of applications, including quarry and cast blasting, exploration and foundation. One of the more valuable tools used in mining related hydrologic investigations can be a borehole camera. Preparation of a new borehole sealing material of coal. Natural specimens selected from the quarry and the layout of borehole are shown in fig. Phosphate mines and mining, borehole mining publisher pgh. It typically includes locality, lithological descriptions with depth and thickness. Patents on similar borehole mining tools were issued to ashton in 1950, quick in 1955, fly in. Sometimes, more than one borehole is drilled from the same drill site. Drilling fluids range from water to oil to complex chemical systems with properties designed for specific site conditions to aid the drilling process. Geotechnical download wellcad x64 an analysis tool for.
This method does little damage to the borehole wall, and the drilling fluid coats and seals the borehole wall reducing fluid loss and wall collapse. Borehole records are produced from a geologists or surveyors observations of the rock core extracted from the ground. Borehole mining is done to mine many industrial materials like uranium, iron ore, quartz sand, gravel, gold, diamonds and amber. Its functioning draws upon the usage of brand new contemporary means of investigation, among which the following ones can be emphasized as being the most important ones. Balance payable on the completion of the borehole after calculation of actual measured works.
Introduction and use of the borehole camera in miningrelated investigations u. Technology news 460 prototype borehole miner selectively. The borehole mining tool is suspended on a drill rig tower which allows the tool to rotate and move vertically along. Department of health and human services, public health service, centers for disease control and prevention, national institute for occupational safety and health, technology news 460, 1997 jul. Abbreviations used in boreholewater well records 124 kb pdf. Click download or read online button to get techniques in underground mining book now. Conceptually, hydraulic borehole mining hbhm offers a low cost alternative. Introduction and use of the borehole camera in mining. Analysis of borehole sampling methods in lignite seam evaluation fuels. In the discovery of new tin reserves such as pasir padi block, bangka, meranti or the coast of west kalimantan. A borehole is drilled from land surface to a desired depth, where then actual borehole mining will take place a casing column is lowered down the hole. It can dispel to some degree the old adage that you cannot see under the ground.
The three key techniques of the bhcms, namely, hydraulic lift of jet pump, air lift, and water. The earliest united states patent for a borehole mining tool was issued to clayton in 1932. Sch is the distance from the end of the explosive charge in one hole to another that is nearest. Rock blasting in underground mining pdf free download. Download techniques in underground mining or read online books in pdf, epub, tuebl, and mobi format. Correlation beween rotary drill performance parameters and.
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. A hydraulic borehole mining system has a cutting jet nozzle supported on an insert short length of tubing of a cutting jet head within a water supply conduit in the lowest section of a multiconduit pipe string that extends from the surface through a borehole to a target zone to be mined. Search borehole scans british geological survey bgs. The tool is lowered into a well until the hydro monitor reaches the depth of the hole where the borehole mining is started. Pathogens diseasecausing organisms that include bacteria, amoebas and viruses, as well as the eggs and larvae of parasitic worms. The inclination of these boreholes varies from 20 to 50 degrees, and the axis of the boreholes is inclined to the longwall axis at 1530 degrees. Queensland borehole series datasets open data portal. In the second phase, one production borehole was excavated until a connection was cut in the pay zone that linked the production hole with an auxiliary hole 4 m ft. We strongly recommend the rotary mud or rotary wash method. Borehole hydraulic mining a technique used in underground extraction of a solid mineral, in which a solid mineral is broken up and delivered to boreholes by water and removed to the surface as a hydraulic mixture.
The borehole sealing effect of this coal seam requires highpressure water infusion. Rockbreaking mechanism and experimental analysis of confined. Surface test on west australia gold ores part one more on. Borehole mining is a general term for any process in which the wanted mineral or metal values of a deposit are fluidized in place by some means and removed from the deposit via borehole. A technological innovation to conserve tin alluvial mining.
In this paper, an opportunity election model of secondary borehole sealing was. One of the more valuable tools used in miningrelated hydrologic investigations can be a borehole camera. Whole rock and clay mineralogy queensland shp, tab, fgdb, kmz, gpkg. Hydraulic borehole mining kinley exploration is a world leader in hydraulic borehole mining strategy, equipment design, engineering and operations. Hydraulic borehole mining system and method dibble. The mining tool is then inserted into the borehole and high pressure. Carlson boretrak boreholedeviation measurement system boretrak is our costeffective, rugged boreholedeviation surveying system thats compact, lightweight and portable. Rock blasting in underground mining chapter outline 19.
The iron gives the water an unpleasant metallic taste and odour, stains laundry and white enamel on sinks and bowls, and discolours food. The law of contract act as administered in the law of kenya act shall be applicable, upon signing of contract agreement which is intended to create legally binding obligations between the contractor and the client. The borehole data in this series are a digital representation of the distribution or locations of drill bore holes over the area. Borehole mining consists of two pipes one for pumping down high pressure water and another that. Rockbreaking mechanism and experimental analysis of. This paper shows the estimate technological parameters for borehole hydroproduction of sand by technical deep drilling slim well differently diameters.
Dynamic secondary boreholesealing method for gas drainage. Borehole mining no longer a science project, borehole mining is proving itself as a workable technology that can be applied to a number of industries. Techniques in underground mining download ebook pdf. Drilling must be done with minimal sidewall disturbance. Hydraulically jetcutting a cavern of rock 20 feet in diameter from a drilled bore hole allows this system to recover resources previously uneconomical for open pit or underground mining operations. Office of surface mining reclamation and enforcement 11620 background. To improve the borehole sealing effect of coal seam water infusion, especially that of coal seam with low permeability and high rigidity, this study investigated the performance test optimization of two cementbased sealing materials. Borehole mining consists of two pipes one for pumping down high pressure water and another that delivers slurry back to the surface.
This process can be carriedout from land surface, open pit floor, underground mine or floating platform or vessel through predrilled boreholes. Borehole hydraulic mining is used primarily to extract loose and weakly cemented ores, such as phosphorite deposits that occur in layers. Us20106166a1 horizontal borehole mining system and. Boretrak provides an easy way to audit drilling activity accurately and in a wide range of applications, including quar. Apr 10, 1990 a hydraulic borehole mining system in accordance with the invention has a cutting jet nozzle supported for independent vertical movement on a cutting jet head within a lower section of a mining tool string of multiconduit pipe depending from the surface of a borehole to a position adjacent an underground target zone of a formation to be mined.
Hydraulic borehole mining technique the hydraulic borehole mining procedure is the remote extraction of ore through a single borehole. The phosphate zone is between 232 and 250 feet below land surface and consists of approximately equal proportions of finegrained phosphate, sand. Jet boring, borehole mining, or jet mining is applicable to a number of applications. How we measure reads a read is counted each time someone views a publication summary such as the title, abstract, and list of authors. Drilling site preparation and water supply required.
The approach taken in this research project was to mine only the orebearing portion of the deposit using a highpressure water jet to thaw the gravels and a downhole hydrauliclifttype pump to bring the ore to he surface as slurry. Selection of technological parameters in borehole mining production by technical deep drilling and hydroexploitation water consumption quk 150 m3. Economic evaluation of borehole and conventional mining systems in phosphate deposits. A method and system are provided for horizontal borehole mining a seam of material, in which a substantially horizontal borehole is provided through a seam of material, a retractable casing is disposed within the seam, and a high pressure drilling tool is disposed within said casing for excavation of the seam material to form an excavation cavity, the high pressure drilling tool having a high. Two borehole placer miners are placed in boreholes approximately 7. Borehole mining article about borehole mining by the free. A method for economically mining subterranean resource in situ comprising the steps of. It is defined by a focused zone of enriched gold in groundwater coincident with the projected intersection of favorable lowerplate host rocks and a main highangle fault corridor.
Johns county, florida, to determine the feasibility of extracting deeply buried phosphate ore by hydraulic borehole mining techniques. Analysis results are also included for some datasets. Techniques in underground mining download ebook pdf, epub. With over 30 years in applied engineered drilling solutions, the kinley team has pioneered the new age of hydraulic borehole mining techniques and equipment with applied modern engineering. Nge is happy to announce the results of its infill borehole program at the south grass valley project where a 1,000 x 4,000 m carlintype gold deposit ctgd target has been identified. Prototype borehole miner selectively extracts gold from. Under the influence of advanced abutment pressure, the tightness of a borehole is destroyed, so secondary borehole sealing is needed. Introduction and use of the borehole camera in mining related investigations u. This site is like a library, use search box in the widget to get ebook that you want. Exploration techniques for deeper deposits have to be profound. A large diameter borehole is drilled through the ore deposit and 16inch casing cemented from land surface to the top of the deposit. Oil and gas wells wells can be underreamed, vertically or horizontally, to 110 meters in diameter in the proposed producing zone and completed with a slotted liner, sand, or gravel pack, creating a massive well in flow area potentially hundreds of times. Selection of technological parameters in borehole mining production by technical deep drilling and hydroexploitation bojan dimitrijevic1, jan pinka2 and vladimir mitrovic2 abstract this paper shows the estimate technological parameters for borehole hydroproduction of sand by technical deep drilling slim well. Effects of hydraulic borehole mining on ground water at a.
A borehole mining method comprising driving a borehole, into a production zone under a lowdegree angle. Although such levels of iron are not known to be harmful, the undesirable properties can cause communities to accept con. Borehole mining, underground mining, mining techniques. Borehole mining the offshore tin exploitation will be challenging the deeper deposits and probably requires new and improved mining technologies. Said tool is positioned such that the hydromonitor is oriented at an angle. Borehole mining bhm is a remote operated method of extraction mining of mineral. Formation density spectral borehole wireline wireline. Rock blasting in underground mining chapter 19 375 figure 19. A borehole mining method comprising driving a borehole, into a production zone under a lowdegree.