It's also important to comply with the provisions of the Mines Rules, relevant clauses of which are extracted as below:
Union of India - 77. Register of employees
The register required by sub-section (1) of section 48 shall be maintained in Form B, [keeping a separate page for each person employed in the mine] [Inserted by G.S.R. 656, dated 5.6.1980 (w.e.f. 1.10.1980)].
77-A. Identity tokens [Inserted by G.S.R. 656, dated 5.6.1980 (w.e.f. 1.10.1980)]
(1)(a) The owner, agent, or manager of a mine shall issue, free of cost, to every person employed in the mine, a metal token (hereinafter referred to as a token), bearing a number and other particulars by which such person may be identified. Provided that if any other equally effective system of identification is in force in any mine and the Chief Inspector is satisfied of the same, he may exempt such mine from the operation of this rule, subject to such conditions as he may deem fit to impose.
(b) No person employed in a mine shall enter or be permitted to enter for work in any part of a mine unless he carries on his person the token issued to him.
(c) The token shall be of such durable and strong material as cannot be easily damaged or defaced.
(d) The token shall be carried by an employee on his person during the time he is on duty.
(e) Where a token is damaged, defaced, or lost, due to reasons other than the fault or negligence of the employee concerned, a duplicate token shall be issued forthwith to such an employee free of charge, and such duplicate token shall be stamped "DUPLICATE".
(f) Where a token is damaged, defaced, or lost due to the fault or negligence of the employee concerned, a duplicate token stamped "DUPLICATE" shall be issued forthwith to such an employee, and such an employee shall be liable to pay fifty percent of the cost of the duplicate token issued to him.
(2) The token number and other particulars by which the employee may be identified, together with a passport-size photograph, shall be entered in the register in Form B prescribed under Section 78 in The Mines Rules, 1955. The register required by sub-section (3) of section 23 of the Act shall be maintained in Form K.
78. Register of daily attendance
(1) The registers required by sub-section (4) of section 48 of persons employed in the mine (a) below ground, (b) in open-cast workings, and (c) above ground shall be maintained in Forms C, D, and E respectively.
(2) The entries in the register maintained in Form C shall be made at the entrance or entrances to the mine, at the time when a person against whose name the entry is made enters or leaves the mine.
(3) The entries in the registers maintained in Forms D and E shall be made at suitable points on the premises of the mine with reasonable dispatch, at the commencement and end of the period of work.
So far as I know, these provisions have not been amended. As such, it may be necessary that your extant procedure satisfies these stipulations. Also, refer to the SO of Coalmines (clause 7 on page 6) regarding the recording of attendance for your guidance (link:
https://www.mahanadicoal.in/standing.../sde_order.pdf).