45.3—Identification of independent contractors.
(a)
Any independent contractor may obtain a permanent MSHA identification number. To obtain an identification number, an independent contractor shall submit to the District Manager in writing the following information:
(3)
A telephone number at which the independent contractor can be contacted during regular business hours; and
(4)
The estimated annual hours worked on mine property by the independent contractor in the previous calendar year, or in the instance of a business operating less than one full calendar year, prorated to an annual basis.