Present value for end of life cost

Sir, just say if the present value to decommission and restore a gold mine at the end of a 15 year mine life is $1,000,000.
Initial entries are:
Dr PPE $1,000,000
Cr Liability (end of life cost) $1,000,000

Over each of these 15 years and as at each balance sheet date, any changes in the future liability, are these changes reported in P & L,
i.e,
Dr or Cr P & L with change
Dr or Cr with change in liab

or is this accounted for otherwise? Please confirm if correct.