Details

Conditions For Deep-Hole Blasting In Opencast Coal Mine

Conditions For Deep-Hole Blasting In Opencast Coal Mine (See Regulation 194 of the Coal Mines Regulations 2017)

GENERAL

1.0 The owner and agent of an opencast mine shall ensure that a prior scientific study is conducted in designing deep hole drilling and blasting system for the mine taking into consideration all mining parameters and machinery parameters which could have adverse impact on ground vibration in and around the mine and long-term stability of slope of opencast workings and dump yards.

2.0 The Owner and Agent of the mine where deep hole drilling and blasting is proposed shall indemnify the occupants/owners of houses / dwellings / buildings or other structures and the public authority concerned, if any, against danger to their property or injury to them or other persons, arising out of the operations conducted in respect of deep hole drilling and blasting.

3.0 The Owner, Agent or/and Manager of the mine where deep hole drilling and blasting is proposed shall ensure the following:- a) Only properly trained persons who are authorised in writing by the manager for the purpose are deployed. b) Adequate personal protective equipments as required to be used by persons deployed in this connection are provided and also used.

c) Adequate scientific equipments for measurement of the health of machinery deployed, ground movements and various blasting parameters like ground vibrations, noise, etc., are provided.

4.0 The entire operations of conduct of safe deep-hole drilling and blasting operations in the mine including transport of the explosive to the site of its use, shall be placed under the overall charge of a competent person holding First class manager’s certificate, hereinafter referred to as “Blasting Officer”, duly appointed in writing by the manager for the purpose. He shall be assisted in operations connected therewith by adequate number of persons holding atleast an Overman certificate of competency, who are duly authorized in writing by the Manager and are fully trained in deep hole drilling and blasting techniques.

DRILLING OF DEEP-HOLES

5.0 Before commencement, the position of every deep hole to be drilled shall be distinctly marked by an Overman working under the direct control of the Blasting Officer so as to be readily seen by the Driller. 6.0 No drilling shall be commenced in an area where shots have been fired, until the Shotfirer has made a thorough examination at all places, including remaining butts of old deep holes, for unexploded charges that a drill may strike.

7.0 No drill or bore rod or pick shall be inserted in butts of old deep holes even if an examination has failed to reveal presence of explosives.

8.0 Drilling operations shall not be carried on simultaneously on two benches, at places directly one above the other.

9.0 Wherever, drilling operations are being carried out, charging of already drilled deep holes shall not be carried out in the same area at the same time.

CHARGING AND STEMMING

10.0 During the approach and progress of an electric storm, no charging and blasting shall be done and precaution laid down in DG Technical Circular 1/1995 shall be followed. 11.0 No shot hole shall be charged in crushed, broken or fractured ground strata. 12.0 All detonators and primed cartridges shall be kept in secure receptacles at a safe distance from the detonating fuse and the explosive, until actually required for use. 13.0 Charging of explosives shall be such as to ensure continuity of the explosive column. Where deck charging is done, continuity shall be ensured for each deck of explosive charge. 14.0 Primer explosive cartridge shall not be slit or deformed. 15.0 Adequate amount of cap sensitive explosive shall be used with non cap-sensitive explosive charge to ensure complete detonation of the explosive charge. 16.0 In case, water is encountered in any shot-hole, either the shot hole shall be dewatered by blowing compressed air into the hole or the explosive column shall be gently pushed down by wooden rod and sufficient time given for the explosive column to sink to the desired depth before the round is fired. Decking in watery holes shall be avoided. 17.0 The charging of holes shall be carried out in day light hours only.