Detnet South Africa (pty) Limited

Detnet South Africa Ltd

Craig Charles Schlenter

Andre Louis Koekemoer

Albertus Abraham Labuschagne

Christopher Malcolm Birkin

Elmar Lennox Muller

Herman Van Der Walt

David Bruce Harding

Marinus Yates

Jonathan Gounden

Daniel August Julien Louis Maurissens

Albertus A Labuschagne

Labuschagne Albertus A,

In a blasting system a method of determining which borehole in a plurality of boreholes at a blast site is closest to a tagger, wherein latitude and longitude coordinate values for each borehole are determined and by using subsets of the longitude coordinates and latitude coordinates, and by performing a haversine calculation the position of the borehole which is closest to the tagger is determined.

Detonator position determination

A blasting system which includes a number of roving GPS receivers, and associated taggers, which communicate with one another and with a control mechanism, and a reference GPS receiver which transmits RTCM corrective positional data which is stored at each roving GPS receiver to improve the accuracy of coordinate determinations for boreholes.

Blasting system

A detonator for use in a detonating system, which detonator includes discriminating and validating arrangements which sense and validate at least one characteristic of at least one parameter produced by at least one of a light, acoustic, vibratory, magnetic or electrical signal event, and an electronic timer which executes a timing interval in response thereto.

Detonator

A detonator system wherein a detonator is connected via a down-hole harness to a bus extending from a blast controller and wherein a component is connected in series with the down-hole harness to limit leakage current in the harness to a level which can be accommodated by the blast controller.

Electronic detonator leakage current restriction

A method of communicating with a detonator assembly wherein an encryption key associated with the detonator assembly is stored in the detonator assembly and a message, intended for the detonator assembly, is encrypted at the control location using the encryption key whereupon the encrypted message is transmitted to each of a plurality of detonator assemblies and each received message is decrypted and validated.

Selective control of groups of detonators

A detonator which, in response to a command, uses a first modulation process to generate a first signal and, in response to an event, uses a second modulation process to generate a second signal.

Two wire daisy chain

A timing module for use in a detonating system which includes discriminating and validating arrangements which sense and validate at least one characteristic of at least one parameter produced by at least one shock tube event and an electronic timer which executes a timing interval in response thereto.

Detonator including a sensing arrangement

A detonator roll call method wherein each detonator is assigned a unique identifier and, at each detonator, in response to an enquiry signal to all the detonators a count is incremented and compared to the roll call identifier and, if the comparison is positive, a reply is sent by the detonator.

Detonator roll call

An electronic detonator () which includes a housing () which contains an explosive charge (), an initiating element (), a control circuit (), at least one coil () having a plurality of windings () in a tubular configuration, and a magnet () wherein passage of the magnet () through the coil () creates voltage to which the control circuit () is responsive, and a connector () for connecting a shock tube () to the housing ().

Electronic detonator

A detonator () which, in response to a command, uses a first modulation process () to generate a first signal () and, in response to an event, uses a second modulation () process to generate a second signal ().

A method of communicating with a detonator device using radio frequency identification (RFID) technology to read data from the device, and to transmit information and commands to the device.

Detonator device communication

A detonator assembly () which includes a housing (), an explosive () in the housing (), an initiating element () exposed to the explosive (), a circuit for controlling operation of the initiating element (), and a communication arrangement which can establish communication between the circuit and an external controller () at least at one optical frequency.

Detonator assembly

Timing module

A detonator system () which has a plurality of segments (), each segment having a respective plurality of detonators (), and a synchronizer (), which may be a compound arrangement or a single device, which prevents the transmission of voltage modulated signals to the detonators () in one segment (A) if current modulated segments are being transmitted from the detonators () in another segment (B).

Growing community of inventors

Sandton, South Africa

Craig Charles Schlenter