Quarterly report pursuant to Section 13 or 15(d)

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS

v3.10.0.1
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS
 6 Months Ended
Jun. 30, 2018
Environmental Remediation Obligations [Abstract]  
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS
NOTE 13 - ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS
We had environmental and mine closure liabilities of $176.0 million and $171.3 million at June 30, 2018 and December 31, 2017, respectively. The following is a summary of the obligations:
 
(In Millions)
 
June 30,
2018
 
December 31,
2017
Environmental
$
3.2

 
$
2.9

Mine closure1
172.8

 
168.4

Total environmental and mine closure obligations
176.0

 
171.3

Less current portion
3.7

 
3.6

Long-term environmental and mine closure obligations
$
172.3

 
$
167.7

 
 
 
 
1 Includes our active operating mines, our indefinitely idled Empire mine and a closed mine formerly operating as LTVSMC.

Mine Closure
The accrued mine closure obligation for our active mining operations provides for contractual and legal obligations associated with the eventual closure of the mining operations. The accretion of the liability and amortization of the related asset is recognized over the estimated mine lives for each location.
The following represents a roll forward of our mine closure obligation liability for the six months ended June 30, 2018 and for the year ended December 31, 2017:
 
(In Millions)
 
June 30,
2018
 
December 31,
2017
Mine closure obligation at beginning of period
$
168.4

 
$
187.8

Accretion expense
4.7

 
13.9

Remediation payments
(0.3
)
 
(5.6
)
Revision in estimated cash flows
—

 
(27.7
)
Mine closure obligation at end of period
$
172.8

 
$
168.4


For the year ended December 31, 2017, the revision in estimated cash flows relates primarily to updates to our estimates resulting from our three-year in-depth review of our mine closure obligations for each of our U.S. mines. The primary driver of the decrease in estimated cash flows was the Empire mine, as the mine closure obligation was reduced by $26.2 million as a result of the refinement of the cash flows required for reclamation, remediation and structural removal. Prior estimates were based on RS Means (a common costing methodology used in the construction and demolition industry) average costing data while the current estimate was compiled using a more detailed cost build-up approach.