Explosive Patents (Class 299/13)
  • Patent number: 9568295
    Abstract: The present invention relates to a method and related devices for carrying out TBM excavation and expansion blasting, which uses a blast protector and a cart to expand a pilot tunnel by blasting after the pilot tunnel has been formed; and which specifically includes: a step of forming a pilot tunnel; a step of forming a horizontal or vertical blast hole; a step of installing a blast protector within the pilot tunnel; a step of blasting the upper and lower halves of the pilot tunnel to expand the upper and lower halves; and a step of removing the debris formed during the blasting of the upper and lower halves, by dumping the debris into a cart. Accordingly, the rail and cable are protected from the debris formed during the blasting, and working efficiency is improved.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: February 14, 2017
    Inventor: Chan Woo Lee
  • Patent number: 9482507
    Abstract: A method of blasting rock at an underground blast site in which boreholes (11a, b, c) are drilled in a rock mass 10 from a drive defining face 12, each borehole is loaded with at least one charge of explosive material (13a-c, 14a-c, 15a-c), at least one detonator is placed in operative association with each charge, and a sequence of at least two initiation events is conducted to blast the rock mass, in each of which only some of the charges are initiated, by sending firing signals to only the detonators associated with said charges and in which each initiation event is a discrete user-controlled initiation event. In one of the at least two initiation events a stranded portion of the rock mass such as a pillar is created that has already been drilled and charged, and the stranded portion of the rock mass is blasted in a subsequent one or more of the at least two initiation events without personnel accessing said stranded portion.
    Type: Grant
    Filed: December 24, 2015
    Date of Patent: November 1, 2016
    Assignee: ORICA EXPLOSIVES TECHNOLOGY PTY LTD
    Inventors: Stuart Patrick Thomson, Sean Michael Freeman
  • Patent number: 9376902
    Abstract: The subject disclosure relates to determining an optimum orientation for perforations around the circumference of a subsurface borehole and optimum wellbore fluid initiation pressure for hydraulic fracturing in anisotropic formations.
    Type: Grant
    Filed: August 15, 2012
    Date of Patent: June 28, 2016
    Assignee: Schlumberger Technology Corporation
    Inventors: Romain Charles Andre Prioul, Florian Karpfinger, George Waters, Brice Lecampion
  • Patent number: 8850984
    Abstract: An explosive cartridge comprising: an explosive composition; a deactivating agent that is capable of desensitising the explosive composition; and a barrier element that prevents contact between the explosive composition and the deactivating agent and that is adapted to be at least partially removed on use of the explosive cartridge.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: October 7, 2014
    Assignees: Orica Explosives Technology Pty Ltd., Commonwealth Scientific and Industrial Research Organisation
    Inventors: Thomas Smylie, Richard John Goodridge, Deane Tunaley, Steven Kotsonis, Les Armstrong, Brad Beikoff, Alexander Bilyk, Zang Xiaoqing, Long Yu, Dong Yang Wu
  • Patent number: 8726809
    Abstract: A perforating system is disclosed having a perforating gun containing a plurality of radially-oriented shaped charges disposed along the longitudinal axis of the gun. Each charge, when detonated, produce a jet whose penetration velocity exceeds the acoustic velocity of the formation (i.e., target) material to be perforated. A method of operating such a perforating system is also provided, as is a shaped charge having the described characteristics.
    Type: Grant
    Filed: June 27, 2006
    Date of Patent: May 20, 2014
    Assignee: Schlumberger Technology Corporation
    Inventors: Ian C. Walton, Brenden M. Grove
  • Patent number: 8728429
    Abstract: In certain implementations, a method of manufacturing electrically conductive nanodiamond particles involves providing at least one type of carbon-containing explosive material and at least one type of non-explosive material; wherein the non-explosive material contains at least one or more than one element or species other than nitrogen that serve as a nanodiamond dopant; mixing the carbon containing explosive material with the non-explosive material; detonating the mixture under conditions of negative oxygen balance in the presence of a cooling medium; purifying the product of detonation from incombustible impurities; and carrying out additional processing for activation or enhancement of electrical conductance. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.
    Type: Grant
    Filed: June 22, 2010
    Date of Patent: May 20, 2014
    Assignee: International Technology Center
    Inventor: Olga Shenderova
  • Patent number: 8631744
    Abstract: A method of blasting plural layers of material (38, 40, 42, 44) in a blastfield (16) that reduces the amount of mechanical excavation required to expose a lower layer of material. The method includes using rows of equally spaced blastholes (18, 20, 22, 24) that pass through all of the layers and additional intermediate rows of blastholes (26, 28) that pass down only through top layer (40). Each blasthole is capped with stemming material and includes one or more decks of explosives material (46) and detonators (48), with air decks or inert stemming (45) separating adjacent explosives decks (46). The detonators in layer (40) are detonated first in order from row (18) rearwards to throw a substantial amount of the blast material from layer (40) forwardly of free face (12) onto floor (34).
    Type: Grant
    Filed: October 13, 2004
    Date of Patent: January 21, 2014
    Assignee: Orica Explosives Technology Pty Ltd
    Inventors: Geoffrey Brent, Tapan Goswami
  • Patent number: 8627769
    Abstract: The invention provides a method of preparing a blast hole which method comprises the steps of: drilling a blast hole; placing explosives in the blast hole; filling the blast hole with a stemming material comprising a cement composition and water wherein the weight ratio of water to solids content of the stemming material is at least about 1:1.
    Type: Grant
    Filed: July 26, 2010
    Date of Patent: January 14, 2014
    Assignee: Minova International Limited
    Inventors: Peter Shelley Mills, Rory John Michael Harris
  • Publication number: 20130200680
    Abstract: A tunnel excavation technique using a water jet. A water jet system includes a moving unit movable back and forth with respect to an area to be blasted for tunnel excavation, an articulated robot arm mounted on the moving unit, a water jet nozzle which ejects high-pressure water and an abrasive toward an area to be excavated, and a control unit which controls the moving unit, the articulated robot arm and the water jet nozzle. A free face having a predetermined depth is formed of the area to be excavated in the direction in which the tunnel is to be excavated using the water jet system. Since the blasting is performed after the free face is formed, blast vibration can be effectively restricted.
    Type: Application
    Filed: October 4, 2011
    Publication date: August 8, 2013
    Applicant: KAIST (Korea Advanced Institute of Science and Technology)
    Inventors: Gye-Chun Cho, Tae-Min Oh
  • Publication number: 20130169961
    Abstract: A process for real-time classification of materials, the process including: conducting laser induced breakdown spectroscopy on the material (LIBS), wherein at least one second laser pulse is directed to the plume so as to selectively energize only a portion of the plume; measuring optical emissions from the energized portion of the plume; and assessing the elemental composition of the material on the basis of the optical emissions from the excited portion of the plume; wherein the energized portion of the plume is substantially smaller than the entire plume so that the measured optical emissions are relatively independent of the size of the entire plume and hence are relatively independent of the optical absorption and vaporization characteristics of the material, thereby allowing a more accurate assessment of the elemental composition of the material than if the assessment was based on the optical emissions from the entire plume.
    Type: Application
    Filed: March 29, 2011
    Publication date: July 4, 2013
    Applicant: DATATRACE DNA PTY LIMITED
    Inventor: John Kraft
  • Publication number: 20130147253
    Abstract: A method of mining a mineral deposit includes setting a plurality of explosive charges at spaced pre-blast locations in the deposit, wherein at least selected pre-blast locations also carry respective markers that are such that the post-blast location of at least a useful proportion will be detectable after explosion of the charges. After the charges are exploded to fragment the deposit, the post-blast locations of certain of the markers are detected to obtain an indication of the relative positions of selected components of the mineral deposit after the fragmentation of the deposit by the exploding of the charges. Also disclosed is a method utilising a plurality of markers arranged to emit a detectable signal after blast fragmentation, and detecting the post-blast locations by triangulation techniques employing a plurality of receiver detectors. A further aspect proposes the use of secondary explosive charges as post-blast markers.
    Type: Application
    Filed: February 11, 2013
    Publication date: June 13, 2013
    Applicant: ORICA EXPLOSIVES TECHNOLOGY PTY LTD
    Inventor: ORICA EXPLOSIVES TECHNOLOGY PTY LTD
  • Publication number: 20130140871
    Abstract: The present invention relates to ammonium nitrate fuel oil mixtures, and includes compositions comprising (a) ammonium nitrate, (b) a fuel component, (c) a functionalized polymer component, and (d) an oil-soluble anionic surfactant, wherein the mixture of components (b), (c) and (d) form a gel that will not readily flow. The compositions of the present invention provide improve fuel retention and/or water resistance properties, particularly when the compositions use low quality porous prills of ammonium nitrate.
    Type: Application
    Filed: July 27, 2011
    Publication date: June 6, 2013
    Applicant: THE LUBRIZOL CORPORATION
    Inventors: Andrei B. Fedorov, Barry Love
  • Publication number: 20130106165
    Abstract: A method of block cave mining comprising excavating undercut tunnels (21) at an undercut level; drilling undercut blast holes (25) through the undercut tunnel roofs and setting and detonating explosive charges in those holes to blast rock above the undercut tunnels to initiate the formation of broken rock caverns (26) above the undercut tunnels (21); excavating extraction level tunnels (22) at an extraction level below the undercut level; drilling drawbell blast holes (33) upwardly from the extraction level tunnels at selected drawbell locations toward the broken rock caverns (26) and setting and detonating explosive charges in those holes to blast drawbells (32) through which broken rock falls down into the extraction level tunnels (22); and progressively removing such fallen rock from the drawbell locations through the extraction level tunnels (22); wherein some of the excavation is done mechanically by tunnel boring machinery.
    Type: Application
    Filed: February 22, 2011
    Publication date: May 2, 2013
    Inventors: Max Edward Oddie, Colin Ian Jones, Pierre Labrecque, Fredric Christopher Delabbio
  • Patent number: 8418618
    Abstract: A method of small-charge blasting, a rock drilling unit and a front guide to be used therein. By means of a rock drill machine provided in the rock drilling unit, a hole is first drilled into a material to be excavated and, subsequently, a drilling tool is pulled out of the hole. Next, one or more propellants comprising a propellant charge are fed to the bottom of the hole through a propellant feed channel provided in connection with a feed beam. Then, the hole is sealed and the propellant is ignited, whereupon a high gas pressure is generated, which causes fractioning in the material to be excavated. During the feeding and ignition of the propellant, the rock drill machine is kept in a parallel direction with respect to the hole.
    Type: Grant
    Filed: December 16, 2008
    Date of Patent: April 16, 2013
    Assignee: Sandvik Mining & Construction Oy
    Inventors: Erkki Ahola, Veikko Räisänen
  • Patent number: 8413584
    Abstract: The invention provides a method of preparing a blast hole which method comprises the sequential steps of: drilling a blast hole; placing explosives in the blast hole; filling the blast hole with a stemming material comprising a cement composition and water wherein the weight ratio of water to solids content of the stemming material is at least about 1:1.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: April 9, 2013
    Assignee: Minova International Limited
    Inventors: Peter Shelley Mills, Rory John Michael Harris
  • Patent number: 8398175
    Abstract: A method of mining a mineral deposit includes setting a plurality of explosive charges at spaced pre-blast locations in the deposit, wherein at least selected pre-blast locations also carry respective markers that are such that the post-blast location of at least a useful proportion will be detectable after explosion of the charges. After the charges are exploded to fragment the deposit, the post-blast locations of certain of the markers are detected to obtain an indication of the relative positions of selected components of the mineral deposit after the fragmentation of the deposit by the exploding of the charges. Also disclosed is a method utilizing a plurality of markers arranged to emit a detectable signal after blast fragmentation, and detecting the post-blast locations by triangulation techniques employing a plurality of receiver detectors. A further aspect proposes the use of secondary explosive charges as post-blast markers.
    Type: Grant
    Filed: May 26, 2008
    Date of Patent: March 19, 2013
    Assignee: Orica Explosives Technology Pty Ltd
    Inventors: Alexander Theofile Spathis, Peter Conran Dare-Bryan, Rodney Wayne Appleby, Richard John Goodridge
  • Patent number: 8381654
    Abstract: A method of charging explosives in a substantially vertical blast borehole, with a loading density reduced in relation to that corresponding to the complete fill up of the borehole diameter. The method includes the step of introducing a charging hose in fluid connection with a nozzle into an end opening of the vertical blast borehole. The charging hose and nozzle are then moved along the blast borehole along a travel direction at a controlled rate. As the nozzle is being moved, an explosive emulsion is forced though the nozzle at a controlled pumping rate such that the emulsion is sprayed by the nozzle laterally relative to the travel direction, in an arc formation extending around an axis of the nozzle, which axis is parallel to the travel direction, and onto an inner wall of the blast hole. The pumping rate and the controlled moving rate are adjusted so as to form a coherent string of the explosive emulsion exiting from the nozzle, whereby the string only partially fills up the blast borehole diameter.
    Type: Grant
    Filed: November 6, 2009
    Date of Patent: February 26, 2013
    Assignee: Dyno Nobel Asia Pacific Pty Limited
    Inventor: Rauf Osterman
  • Publication number: 20130002003
    Abstract: A rock-fracturing mining explosive element; said explosive element subjected to an initial spreading against a target surface on impact of said explosive element with said target surface; said explosive element so constructed as to control the rate of spreading and compression against said surface prior to detonation.
    Type: Application
    Filed: June 29, 2012
    Publication date: January 3, 2013
    Inventors: Chris MURRAY, Steven Richard Courtley, Ron Gilbert, Craig Brown
  • Patent number: 8342095
    Abstract: A cylindrical casing (18) has first and second ends (33 and 31), the first end (33) being closed. The casing (18) encloses an accelerant (22) disposed adjacent the first end (33), at least one stemming mechanism (21), and a fuse (14 or 14?) extending from the accelerant (22) out of the second end (31) of the cylindrical casing (18). The cartridge (12) is made of a rupturable cylindrical casing (18) with accelerant (22) and self-stemming mechanism (22) inserted therein. A method of breaking hard (R) materials involves detonating a self-stemming cartridge (12) disposed in a borehole (B).
    Type: Grant
    Filed: October 17, 2007
    Date of Patent: January 1, 2013
    Inventor: Carroll Bassett
  • Patent number: 8342609
    Abstract: An open cast mining method includes sinking a blasting borehole (14) for receiving an explosive charge into a ground body (12) which is to be mined, taking an initial measurement of one or more borehole conditions, including at least a temperature inside a bottom half (14.1) of the borehole (14), and loading the borehole (14) with a base explosive charge (28) only if the initial measurement of all of the one or more measured borehole conditions are within predefined limits indicating that the borehole (14) will not be subject to uncontrolled detonation of the base explosive charge (28). The one or more borehole conditions, including at least said temperature, are further measured and monitored after the base explosive charge (28) has been loaded. An alarm signal external of the borehole (14) is provided if any of the one or more measured borehole conditions are not within predefined limits so that there is a risk of uncontrolled detonation of the explosive charge (28).
    Type: Grant
    Filed: March 4, 2010
    Date of Patent: January 1, 2013
    Assignee: AEL Mining Services Limited
    Inventors: Robert James Holdcroft, Neville Robert Marillier, Derek Luke Anthony, Andre Pienaar
  • Patent number: 8342261
    Abstract: A method for small-charge blasting, and a rock drilling unit used therein. By means of a rock drilling machine of the rock drilling unit, a drill hole is first drilled into material to be excavated, after which one or more cartridges comprising a propellant charge are fed through a drilling tool onto the bottom of the drill hole. The drilling unit comprises a cartridge feed station, which is separate from the rock drilling machine and from which the cartridges may be fed into a longitudinal channel in the drilling tool.
    Type: Grant
    Filed: December 17, 2008
    Date of Patent: January 1, 2013
    Assignee: Sandvik Mining & Construction Oy
    Inventors: Erkki Ahola, Veikko Räisänen
  • Publication number: 20120242135
    Abstract: A method of blasting rock at an underground blast site in which boreholes (11a, b, c) are drilled in a rock mass (10) from a drive defining face (12), each borehole is loaded with at least one charge of explosive material (13a-c, 14a-c, 15a-c), at least one detonator is placed in operative association with each charge, and a sequence of at least two initiation events is conducted to blast the rock mass, in each of which only some of the charges are initiated, by sending firing signals to only the detonators associated with said charges and in which each initiation event is a discrete user-controlled initiation event. In one of the at least two initiation events a stranded portion of the rock mass such as a pillar is created that has already been drilled and charged, and the stranded portion of the rock mass is blasted in a subsequent one or more of the at least two initiation events without personnel accessing said stranded portion.
    Type: Application
    Filed: September 29, 2010
    Publication date: September 27, 2012
    Applicant: ORICA EXPLOSIVES TECHNOLOGY PTY LTD,
    Inventors: Stuart Patrick Thomson, Sean Michael Freeman
  • Patent number: 8205947
    Abstract: A method for fracturing a solid material is disclosed. The method comprises boring at least one bore hole in the solid material, the bore hole having a bottom and an open top. Reactive materials capable of an exothermic reaction to produce a liquid and a gas are introduced into the bore hole. The bore hole is then sealed at the open top. The exothermic reaction is then initiated to produce the liquid and the gas. The pressures generated by the liquid and gas in the bore hole result in fracturing of the solid material.
    Type: Grant
    Filed: September 6, 2006
    Date of Patent: June 26, 2012
    Assignee: 14007 Mining Inc.
    Inventor: Thomas A. Morrison
  • Patent number: 8136449
    Abstract: An inexpensive bullet-shaped plug is shown for use in a blasting hole containing water in the bottom thereof, which plug permits dry powder to be used above the waterline rather than more expensive wet powder. After the blasting holes are drilled, if water accumulates in the bottom thereof, the bullet-shaped plug with a center weight is dropped into the hole, which bullet-shaped plug floats on the water. Small rocks are dropped on top of the bullet-shaped plug causing upper tentacles to flare out to engage the wall of the blasting hole. Dry powder is then loaded into the blasting hole on top of the bullet-shaped plug. A cap is inserted a distance below the surface of the blasting hole. Thereafter, a series of similar blasting holes are blown at one time to create debris that can be removed or further processed.
    Type: Grant
    Filed: May 17, 2010
    Date of Patent: March 20, 2012
    Inventor: Peter S. Escamilla
  • Patent number: 8015921
    Abstract: An electronic blasting capsule which includes a housing which contains a propellant, a fuse, a sensor for detecting the position of the housing in a capsule delivery path, an energy arrangement for obtaining energy from an external energy source, and a controller, responsive to the sensor and the energy arrangement, for firing the fuse to initiate the propellant.
    Type: Grant
    Filed: September 8, 2008
    Date of Patent: September 13, 2011
    Assignee: Sandvik Mining and Construction RSA (PTY) Ltd.
    Inventors: Jarmo Leppanen, Ockert Oosthuizen
  • Patent number: 7942481
    Abstract: A method of breaking rock which includes the steps of drilling a hole in the rock using a drill rod; leaving the drill rod in the hole; using water flow to direct a propellant charge into the hole through a passage in the drill rod; and at a leading end of the drill rod, firing the propellant charge with, at least, the drill rod and water in the hole and passage providing a stemming function.
    Type: Grant
    Filed: March 13, 2006
    Date of Patent: May 17, 2011
    Assignee: Sandvik Mining and Construction OY
    Inventor: Jarmo Leppänen
  • Patent number: 7896443
    Abstract: A process for extracting ore from a vein (10) comprises drilling spaced-apart boreholes (16) directly in the vein (10). The boreholes (16) are enlarged using thermal fragmentation generally up to the boundaries between the vein and surrounding waste. A blasthole (18) is then drilled in the vein between the thermally enlarged boreholes (17) for placement of explosive. The explosive is fired to break the ore between the enlarged boreholes (17). The enlarged boreholes (17) act as weakening regions to direct the blasting effect and minimize dilution.
    Type: Grant
    Filed: February 1, 2010
    Date of Patent: March 1, 2011
    Assignee: Rocmec International Inc.
    Inventor: Donald Brisebois
  • Publication number: 20110006585
    Abstract: An open cast mining method includes sinking a blasting borehole (14) for receiving an explosive charge into a ground body (12) which is to be mined, taking an initial measurement of one or more borehole conditions, including at least a temperature inside a bottom half (14.1) of the borehole (14), and loading the borehole (14) with a base explosive charge (28) only if the initial measurement of all of the one or more measured borehole conditions are within predefined limits indicating that the borehole (14) will not be subject to uncontrolled detonation of the base explosive charge (28). The one or more borehole conditions, including at least said temperature, are further measured and monitored after the base explosive charge (28) has been loaded. An alarm signal external of the borehole (14) is provided if any of the one or more measured borehole conditions are not within predefined limits so that there is a risk of uncontrolled detonation of the explosive charge (28).
    Type: Application
    Filed: March 4, 2010
    Publication date: January 13, 2011
    Applicant: AFRICAN EXPLOSIVES LIMITED
    Inventors: Robert James Holdcroft, Neville Robert Marillier, Derek Luke Anthony, Andre Pienaar
  • Publication number: 20100295359
    Abstract: A method of mining a valuable metal or material in an ore body is described. The method comprises the steps of: a) placing a cushion in a stope whereby the cushion creates a void into which fragmented rock can expand during subsequent blasting operations for a second or subsequent panel; and, b) maintaining the void until blasting operations occur whereupon the void is caused to collapse to accommodate fragmented ore generated during blasting operations.
    Type: Application
    Filed: November 12, 2009
    Publication date: November 25, 2010
    Applicant: MTI PRODUCTS PTY LTD
    Inventors: Nicholas Grant Bodley, Terrence Peter Clarke, Justin Andrew Widdifield
  • Publication number: 20100276984
    Abstract: A cylindrical casing (18) has first and second ends (33 and 31), the first end (33) being closed. The casing (18) encloses an accelerant (22) disposed adjacent the first end (33), at least one stemming mechanism (21), and a fuse (14 or 14) extending from the accelerant (22) out of the second end (31) of the cylindrical casing (18). The cartridge (12) is made of a rupturable cylindrical casing (18) with accelerant (22) and self-stemming mechanism (22) inserted therein. A method of breaking hard (R) materials involves detonating a self-stemming cartridge (12) disposed in a borehole (B).
    Type: Application
    Filed: October 17, 2007
    Publication date: November 4, 2010
    Inventor: Carroll Bassett
  • Publication number: 20100278712
    Abstract: The present invention provides a method and formulation for the creation of a diamond-carbon bearing material of varying particle sizes. The material is a detonation by-product of explosive formulations that employ carbon dioxide as the oxidizing agent and a material, such as powdered magnesium, as the fuel for such detonation.
    Type: Application
    Filed: December 22, 2008
    Publication date: November 4, 2010
    Inventor: Daren Normand Swanson
  • Publication number: 20100225155
    Abstract: A method of mining a mineral deposit includes setting a plurality of explosive charges at spaced pre-blast locations in the deposit, wherein at least selected pre-blast locations also carry respective markers that are such that the post-blast location of at least a useful proportion will be detectable after explosion of the charges. After the charges are exploded to fragment the deposit, the post-blast locations of certain of the markers are detected to obtain an indication of the relative positions of selected components of the mineral deposit after the fragmentation of the deposit by the exploding of the charges. Also disclosed is a method utilising a plurality of markers arranged to emit a detectable signal after blast fragmentation, and detecting the post-blast locations by triangulation techniques employing a plurality of receiver detectors. A further aspect proposes the use of secondary explosive charges as post-blast markers.
    Type: Application
    Filed: May 26, 2008
    Publication date: September 9, 2010
    Inventors: Alexander Theofile Spathis, Peter Conran Dare-Bryan, Rodney Wayne Appleby, Richard John Goodridge
  • Publication number: 20100156167
    Abstract: A process for extracting ore from a vein (10) comprises drilling spaced-apart boreholes (16) directly in the vein (10). The boreholes (16) are enlarged using thermal fragmentation generally up to the boundaries between the vein and surrounding waste. A blasthole (18) is then drilled in the vein between the thermally enlarged boreholes (17) for placement of explosive. The explosive is fired to break the ore between the enlarged boreholes (17) . The enlarged boreholes (17) act as weakening regions to direct the blasting effect and minimize dilution.
    Type: Application
    Filed: February 1, 2010
    Publication date: June 24, 2010
    Inventor: Donald BRISEBOIS
  • Patent number: 7707939
    Abstract: Methods of blasting rock are disclosed and claimed in which blast holes are arranged in group of 2 to 7 blast holes. Within each of the groups, adjacent columns of explosive material (12) are actuated within 5 ms of one another Initiation of blasting between the respective groups occurs at least 8 ms after completion of initiation of an adjacent group. Initiation devices (13, 24) may be located at the lower end, upper end or both ends of the respective blast holes, depending on the stress field that is intended to be generated within the rock. As a result, environmental stresses such as ground vibrations are reduced, and the efficiency of rock fragmentation are increased.
    Type: Grant
    Filed: June 21, 2005
    Date of Patent: May 4, 2010
    Assignee: Orica Explosives Technology Pty Ltd
    Inventors: Geoffrey Frederick Brent, Alan Minchinton, Michael John Noy
  • Patent number: 7578237
    Abstract: A method for controlling the initiation of an electronic detonator when located in surrounding ground, the method comprising the steps of: measuring the actual spatial position of the said detonator in relation to one or more adjacent detonators; and calculating the time of initiation of the said detonator based upon its actual spatial position.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: August 25, 2009
    Assignee: Redbull Powder Co. Limited
    Inventors: Peter Johnston, John Keir Russel
  • Patent number: 7406918
    Abstract: A method of blasting in which rock pile profile associated with a blast field is controlled by precise control of the detonation delay times between and/or within individual blastholes in the blast field, in combination with the control of one or more other blast parameters. One or more of the blast parameters may by blasthole geometry, explosive charge or blast initiation location.
    Type: Grant
    Filed: February 9, 2007
    Date of Patent: August 5, 2008
    Assignee: Orica Explosives Technology Pty Ltd.
    Inventors: Geoffrey Frederick Brent, Michael John Noy, Dane Peter Blair
  • Patent number: 7387071
    Abstract: A drill hole (350) extends into rock to be blasted. A blasting accessory (310) includes a container portion (312) for holding a predetermined volume of stemming material, and a spacer (330) for spacing the stemming material a predetermined distance from a surface, e.g. a blind bottom of the drill hole. The container portion has a top (320) surrounded by a dilatable, inverted skirt forming a seal (342), and forms a support for a blasting substance like an explosive.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: June 17, 2008
    Assignee: International Technologies, LLC
    Inventors: Nils Alberto Heinke, Roger Dean Skaggs, Stephen Mitchell Collinsworth
  • Patent number: 7367631
    Abstract: Apparatus for breaking rock includes a cartridge with a base and a wall which extends from the base, the base and the wall forming an enclosure, a propellant inside the enclosure and means for igniting the propellant, and wherein at least the wall is made from a malleable material adapted to reinforce the wall of a hole in the rock in which the cartridge is located.
    Type: Grant
    Filed: July 1, 2004
    Date of Patent: May 6, 2008
    Assignee: NXCO International Limited
    Inventor: Andre Van Dyk
  • Patent number: 7293615
    Abstract: An earth boring apparatus for sinking shafts and removing shaft material from the shaft, the apparatus having at least two decks; hydraulic means for allowing movement of the decks relative to one another; releasable anchoring means associated with the decks for engaging walls of the shaft to secure the apparatus in a stationary position; whereby the releasable anchoring means of one of the decks engages the wall while the releasable anchoring means of the other deck is released from the wall to allow motion of the other deck along the shaft, in cooperation with the hydraulic means. The apparatus also includes guide means for forcing a bucket for hoisting shaft material from the shaft along a predetermined path, and an in-stage cut-boom drill.
    Type: Grant
    Filed: November 22, 2004
    Date of Patent: November 13, 2007
    Assignee: J.S. Redpath Limited
    Inventor: Morris J. Medd
  • Patent number: 7069862
    Abstract: A tool (12) has a body (14) with a barrel (18) having opposing threaded and fitted openings (30 and 28). An actuator pin tube (26), for slidably engaging an actuator pin (38) having a tip (40) opposing a retention head (42), extending from the fitted opening (30). A spring assembly (24), disposed in the barrel (18), has a hammer guide (44) engaged in the threaded opening (28) with a hammer (46) slidably engaged therein, a handle mechanism (55) disposed at one end and a spring retainer (52) disposed adjacent the other end of the hammer (46) before a hammerhead (51), and a spring (54) engaged between the hammer guide (44) and the spring retainer (52). A release mechanism (56) engages the hammer (46). A kit (108) containing the tool (12) and a method of operating the tool (12) involving drilling and cleaning a borehole, inserting a cartridge and tool therein, and detonating the load remotely using a pull cord.
    Type: Grant
    Filed: July 29, 2003
    Date of Patent: July 4, 2006
    Inventor: Carroll Bassett
  • Patent number: 7052092
    Abstract: A blasting arrangement (10) includes drillholes (30) in a rock mass (20). Blind ends (32) are drilled to a desired level and, if necessary, are adjusted as shown at (62) to said level. Each hole (30) is plugged by means of a plug (42), which is protected by non flammable buffer material (44), at a level (40) spaced from the end (32). Explosive (50) is charged above the level (40) and the hole is tamped, shown at (60). The holes are detonated desirably by detonators (52), forcing the plugs (42) downwardly and compressing air in chambers (34) above the ends (32). The weakest part of each hole, around the end (32), is split causing a three dimensional zone of weakness at the level of the ends (32). Air forced into the zone of weakness causes a fracture zone (70) at that level, inhibiting propagation of blasting shock waves and protecting the material underneath the level of the ends (32).
    Type: Grant
    Filed: November 19, 2001
    Date of Patent: May 30, 2006
    Inventors: Stephen Mitchell Collinsworth, Nils Alberto Heinke, Roger Dean Skaggs
  • Patent number: 6935702
    Abstract: An electrode for a crusher and a crusher capable of increasing energy utilized for crushing are obtained. The electrode 1 for a crusher comprises a central conductor (12, 17) extending along a central axis and having an outer peripheral surface, an insulating member (13, 18) arranged on the outer peripheral surface of the central conductor (12, 17) and a peripheral conductor (15) arranged to enclose the insulating member (13, 18). The peripheral conductor (15) includes a first conductor (14a) and a second conductor (14b) arranged at a space from the first conductor (14a) in the extensional direction of the central axis.
    Type: Grant
    Filed: April 4, 2002
    Date of Patent: August 30, 2005
    Assignees: Kumagai Gumi Co., Ltd., Okumura Engineering Corporation
    Inventors: Toru Okazaki, Koji Urano
  • Publication number: 20040007911
    Abstract: Apparatus 10 for fracturing a hard material 24 includes a loading head 12 provided with a guide tube 14 for receiving a cartridge 16 containing a charge of energetic material. A flexible elongated conduit 26 is advanced and retracted through the tube 14 via a reel 88. The conduit 26 is also in communication with a stemming loader 30 which holds a supply of particulate stemming material. Tube 14 is supported by a carriage 70 which is able to slide along a member 52 by operation of a rod 76 and cylinder 78. A motor 60 is also coupled to the member 52 to effect rotation of the member 52 and thus tube 14 about an axis A which is parallel to a hole 18 drilled in the material 24. By appropriate operation of the motor 60 and rod 76, the tube 14 can be moved into and out of alignment with the hole 18. When the tube 14 is moved into alignment with the hole 18, cartridge 16 is loaded into the tube 14 and pushed through the tube 14 into the hole 18 by advancing the conduit 26.
    Type: Application
    Filed: February 19, 2003
    Publication date: January 15, 2004
    Inventor: David Carnegie Smith
  • Patent number: 6672673
    Abstract: The present invention discloses an apparatus and method for imaging and clearing an ore pass hang-up. The apparatus includes: a platform that is movable along generally a longitudinal direction of an ore pass; a controllable propulsion unit capable of propelling the platform within the ore pass and to the location of the hang-up; an imaging unit capable of generating an image of the ore pass as the apparatus is moved trough the ore pass, wherein the image is transmittable to a remove viewer; extensible, remotely controllable immobilizing units affixed to the platform; and a remotely controllable unit for clearing the ore pass hang-up. Once in place the apparatus is used to break up or clear the hang-up by, for example, directing blows to the hang-up, directing high pressure fluids to the hang-up, and using an explosive charge.
    Type: Grant
    Filed: June 24, 2002
    Date of Patent: January 6, 2004
    Assignee: The United States of America as represented by the Department of Health and Human Services
    Inventors: Arthur L. Miller, Christopher Dorrington, Paula Schmitz, Travis Garvey, Peter Maricich
  • Patent number: 6672674
    Abstract: The extraction machine for underground ore extraction operations, with extraction of the extraction product by blasting has an advancing support equipment (11) and a face conveyor (18) coupled to it as well as at least one boring device (26) for the production of shot holes (23) and a loading device (27) to supply the face conveyor (18) with the blast rock loosened by blasting, whereby the boring device (26) and the loading device (27) are assigned to a common boring and loading machine (24), which can be driven along the face conveyor (18) at right angles to the direction of mining in the direction towards the rock face (20) running parallel to the direction of mining, or away from this.
    Type: Grant
    Filed: March 4, 2003
    Date of Patent: January 6, 2004
    Assignee: DBT GmbH
    Inventors: Ulrich Paschedag, Harry Martin
  • Publication number: 20030146655
    Abstract: The extraction machine for underground ore extraction operations, with extraction of the extraction product by blasting has an advancing support equipment (11) and a face conveyor (18) coupled to it as well as at least one boring device (26) for the production of shot holes (23) and a loading device (27) to supply the face conveyor (18) with the blast rock loosened by blasting, whereby the boring device (26) and the loading device (27) are assigned to a common boring and loading machine (24), which can be driven along the face conveyor (18) at right angles to the direction of mining in the direction towards the rock face (20) running parallel to the direction of mining, or away from this.
    Type: Application
    Filed: March 4, 2003
    Publication date: August 7, 2003
    Inventors: Ulrich Paschedag, Harry Martin
  • Patent number: 6527345
    Abstract: A method for excavating a tunnel rock face by drilling a pattern of lifter holes and line holes. The line holes ensure the grade or slope of the excavation meets specification while reducing the need for cleaning out the face. A longitudinal band of lifter holes is drilled into the tunnel face at an acute angle in relation to the substantially perpendicular reference axis emerging from the tunnel face. A series of line holes, disposed opposedly adjacent to the lifter holes, are drilled at a smaller acute angle. The lifter holes are drilled deeper than the line holes and they do not intersect. Explosives are loaded into the lifter holes. The line holes are expendable and encourage fracturing of the rock.
    Type: Grant
    Filed: May 10, 2001
    Date of Patent: March 4, 2003
    Assignee: Inco Limited
    Inventors: Wayne N. Lidkea, Gregory Robert Baiden
  • Publication number: 20020167215
    Abstract: A method for excavating a tunnel rock face by drilling a pattern of lifter holes and line holes. The line holes ensure the grade or slope of the excavation meets specification while reducing the need for cleaning out the face. A longitudinal band of lifter holes is drilled into the tunnel face at an acute angle in relation to the substantially perpendicular reference axis emerging from the tunnel face. A series of line holes, disposed opposedly adjacent to the lifter holes, are drilled at a smaller acute angle. The lifter holes are drilled deeper than the line holes and they do not intersect. Explosives are loaded into the lifter holes. The line holes are expendable and encourage fracturing of the rock.
    Type: Application
    Filed: May 10, 2001
    Publication date: November 14, 2002
    Applicant: Inco Limited
    Inventors: Wayne N. Lidkea, Gregory Robert Baiden
  • Patent number: 6454359
    Abstract: A tunnel blasting method is disclosed. The method including the step of drilling blast holes such as cut holes, cut spreader holes, floor holes and roof holes to predetermined depths and in a predetermined hole arrangement. The blast holes are loaded with one or more detonators and explosives, stemming the blast holes with stemming materials. The detonators are detonated using a triggering device. In the hole loading step, one or more air bladders are situated in each of the blast holes so that a front free surface or one or more small free surfaces are formed. As a result, a projective area toward a free surface is enlarged and a total blast pressure is increased to increase the fragmentation rate of a rock and reduce blast vibration.
    Type: Grant
    Filed: October 26, 2000
    Date of Patent: September 24, 2002
    Inventor: Dae Woo Kang
  • Patent number: 6431075
    Abstract: Disclosed herein is a center-cut blasting method for tunnel excavation. The center-cut blasting method includes the step of drilling a single central center-cut hole at the center of a center-cut region, drilling a plurality of auxiliary center-cut holes comprised of large unloaded auxiliary holes and loaded auxiliary holes that are alternately arranged around the central center-cut hole to be situated in a circle having a predetermined diameter, and drilling a plurality of spreader center-cut holes outside the auxiliary center-cut holes to be situated in concentric circles centered by the central center-cut hole. Thereafter, the center-cut holes are loaded with delay detonators and explosives and the center-cut holes are stemmed with stemming material at their entrances. The loaded auxiliary holes of the auxiliary center-cut holes are blasted so as to create a circular pre-split. After that, the central center-cut hole is blasted so as to create initial dual free surfaces.
    Type: Grant
    Filed: December 28, 2000
    Date of Patent: August 13, 2002
    Assignees: Moojin NeoTech Co., Ltd.
    Inventors: Dong Soo Shim, Han Uk Lim, Young Dong Cho