What changed 10-K

Item 1A. Risk Factors

2012-03-09 compared with 2011-03-28 · 2 added, 1 removed, 444 unchanged (1% of the section changed)

443 unchanged sentences

LEGAL PROCEEDINGS

AND RESERVED)

MINE SAFETY DISCLOSURES

Not Applicable.

Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.