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SIGNIFICANT ACCOUNTING POLICIES (Tables)

6 Months Ended

Jun. 30, 2011

Schedule of asset classification and estimated useful life

Asset Classification		Estimated Useful Life
Buildings and building improvements
Buildings		30—40 years
Land, leasehold and building improvements		5—40 years
Camp equipment		12—15 years
Vehicles		3—12 years
Equipment
Capitalized software and computer equipment		3 years
Solar equipment		20 years
Containers and railcars		15—20 years
All other equipment		3—10 years
Furniture and fixtures		5—8 years

- Definition

Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References+ Details