(1)The drill machine shall not be used at a place -(i)where ventilation is such that the velocity of air current is less than 60 meters per minute;(ii)where methane concentration in the general body of the air exceeds 0.5%;(iii)which is in the return airway of the ventilation,unless provided with heavy type of stone dust barriers of a design as specified by the Chief Inspector.(2)The power unit and associated switch gears shall always be placed in the upstream side of the air-current (intake side) and of the boreholes being drilled or the boreholes from where gases are being extracted.(3)The power unit of the drill shall be equipped with an automatic type of methane monitoring and indicating system interlocked with the electric power switch so that all e1ectrical components on the power unit of the drill machine gets automatically switched off in case the concentration of methane reaches 1.0%.(4)Permissibility checks and methane monitor calibration shall be conducted and recorded weekly.(5)Borehole survey shall be conducted at regular interval to maintain desired borehole trajectory.(6)Borehole projections and the actual co-ordinates should be plotted on the mine plan and section regularly to guide the drill operator in time.(7)In order to maintain the desired borehole trajectory, established procedures and techniques shall be adopted.(8)All instruments, apparatuses, tools and tackles used to conduct survey of the borehole and its deviations (trajectory) shall be of a type approved by the Chief Inspector.(9)Details regarding the trajectory of each borehole shall be maintained separately in a bound paged book kept for the purpose and the details about the boreholes with logging thereof as well as observations of the drill operators shall be recorded therein, duly signed and dated by competent person appointed for the purpose in each shift, and counter signed and dated by the drilling engineer, assistant manager and the manager.(10)In case any defect is noticed either during examination or while in use, the drill shall be stopped and shall not be put in to use before it is rectified.(11)Transportation of the drill machine in belowground from one working place to another or from surface to underground or underground to surface shall be done under the constant personal supervision of a competent person authorised in writing for the purpose by the manager.(12)On both sides of the drill machine two hydraulic jack shall be provided which shall be jammed against the roof and floor of gallery to provide the rigidity to the machine during drilling operations or grouting.(13)At the end or every shift, the drill operator shall write his report which may be called Driller's Report in which the operator shall enter all his observations and the work that has been performed by him during the shift and any period of obstruction or stoppage of drilling shall also be recorded with clearly specifying the reasons thereof.
