NO: MSE-29022|62469|2025|MSE(HQ)

Dhanbad, Date: 15/09/2025

DGMS APPROVAL NO.-MSE_62469/4

From

Director General of Mines Safety
Directorate General of Mines Safety,
P.O & Distt: Dhanbad - 826 016.

To

SAUMITRA RATHI, CDET EXPLOSIVE INDUSTRIES PVT LTD, CHAITANYANAND HEIGHTS , 78 SHIVAJI NAGAR
Maharashtra, NAGPUR, NAGPUR, 440010

Subject: Approval of Permitted Electronic Detonator, namely CDET Accura-P (0 to 6) delays, under regulation 208(3) of the Coal Mines Regulation, 2017, for use in underground coal mines of first degree and second degree of gassiness, manufactured by M/s CDET Explosive Industries Private Limited, Nagpur.

Sir,

Please refer to your online application ID No. 62469, dated 28/07/2025, on the above subject.

The matter has since been considered in the light of what has been stated in your application under reference, in view of the satisfactory field trial performance reports from user mines, along with the test report from CSIR-CIMFR, Karandikar Laboratories, Rishabh Testing & calibration Laboratories  and test conducted in the presence of the PESO in the manufacturing facilities, in exercise of the power conferred on the Chief Inspector of Mines also designated as Director General of Mines Safety, I, hereby grant the approval for use of Permitted Electronic Detonator namely CDET Accura-P (0 to 6) delays under Regulation 208(3) of the Coal Mines Regulations, 2017, manufactured by M/s CDET Explosive industries private limited, for use in underground coal mines of first degree and second degree of gassiness, subject to the strict compliance of the following conditions:, 

A.     The conditions for use of Permitted Electronic Detonator shall be as follows:

1.(a) The electronic detonators shall strictly conform in every respect with the construction and physical characteristics of the electronic detonators tested at Central Institute of Mining & Fuel Research, Dhanbad and found safe in incendivity and other characteristics tests, as per the Project Report No.-TSP/0281/2024-25; OCTOBER, 2024

   (b) In order to ensure this, strict control shall be exercised on the quality of the manufacturer, and such periodic inspections and tests, including repeat incendivity tests, shall be carried out and such records shall be maintained as may be necessary.

   (c) No changes in design, construction, or materials shall be made without obtaining written approval from this Directorate. 

2.    The user shall be trained in use of this type of Permitted Electronic Detonator and it shall be ensured that:

   (a)    A copy of the instruction manual dealing with the methods of handling, care and limitations of use shall be handed over to the user;

   (b) The user shall be supplied with the extract of the conditions and special conditions, if any, recommended in the test report with regard to the safe handling and usage of Permitted Electronic Detonator. 

3.    This approval is valid for the period of 02 years (24 months) for E-detonator, namely CDET Accura-P (0 to 6) delays, from the date of issue of this letter.

B.     The general conditions for use of Permitted Electronic Detonator and Electronic Exploder (Electronic Blasting System) shall be as follows:

1. In electronic blasting system, the initiation of a permitted electronic detonator shall be done by using an electronic exploder of the same manufacturer and compatible with each other. In no case shall initiation of permitted electronic detonators be done by the Electronic Exploder of another manufacturer.

2.(a) The Blasting/Short firing shall be conducted under the direct supervision of an Assistant Manager having at least Second-Class Manager’s Certificate of Competency (UR) under the Coal Mines Regulations, 2017. 

3. (a) Before using the electronic detonators, each detonator shall be subjected to the test for proper functioning using approved Electronic Exploder of same manufacturer.

    (b) All the conditions of the solid blasting permission of the concerned mine shall be complied with during the blasting operation.

4.    The standard operating procedure (SOP) shall be prepared by user for the handling & use of permitted electronic detonator & Electronic Exploder and the same shall be implemented during handling & use of the permitted electronic detonator & Electronic Exploder, in the mine.

5.    Any accident or injuries, including loss of lives or properties, caused due to defects or malfunctioning of this product shall be adequately indemnified by the manufacturer in agreement with the user (s).

6.    Persons engaged in use of the permitted electronic detonator & Electronic Exploder shall be suitably trained and duly authorized by the manager of the mine.

7.    An officer of this Directorate may at any time draw samples of Permitted Electronic Detonator or Electronic Exploder or both, either from the factory or from the user, and get them tested at the cost of the manufacturer. If the test reports are not found satisfactory, this approval shall be deemed to be withdrawn.

8.    All precautions in accordance with the relevant provisions of the Coal Mines Regulations, 2017, applicable for transport, storage, handling, charging, use, and firing of the explosives in underground coal mines shall be observed.

9.    Any modification/alteration to the equipment that might be considered necessary at a later date in the interest of safety for efficient handling, operation, maintenance, and reliability of the equipment shall be carried out upon being so directed.

10.    Please note that the above permission is also subject to the following additional conditions:

a) If at any time, any of the conditions subject to which this approval has been granted are not complied with, the approval shall be deemed to have been revoked with immediate effect.

b) This approval may be amended or withdrawn at any time if considered necessary in the interest of safety.

c) This is being issued without prejudice to any other provision of law that may be or become applicable at any time. 

C. The conditions for the use of Electronic Exploder shall be as follows:

1. The regular approval for Electronic Exploder is not being considered at present, as the satisfactory performance report of use of the same for three months has not yet been submitted as required in the Field Trial Approval letter no.MSE-29022/62353/2025/MSE(HQ), dated 16/06/2025.

2. If still interested, a fresh application for Regular approval of e-Exploder, shall be submitted along with performance report in the prescribed format as per the approval policy.