2012-10-05_REVISION - M1977342 (12)

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TR -18 to Permit M- 1977 -342 Environmental Protection Plan 1. INTRODUCTION 1.1. Purpose and Objectives In April 1994, the Colorado Mined Land Reclamation Board (Board) approved and promulgated amendments to the Mineral Rules and Regulations under the Colorado Mined Land Reclamation Act (Act). The most important of these changes was the classification and definition of a "Designated Mining Operation" and the addition of Section 6.4.21 EXHIBIT U - Designated Mining Operation Environmental Protection Plan to Rule 6. A Designated Mining Operation (DMO) is defined as a mining operation where designated chemicals used in metallurgical processing are present on -site; or toxic or acid - forming materials will be exposed or disturbed as a result of mining operations; or acid mine drainage occurs or has the potential to occur due to mining or reclamation activities. The Colorado Department of Natural Resources (CDNR), Division of Minerals and Geology (DMG), the agency that administers the Colorado Mineral Rules and Regulations, formally notified the Henderson Mine and Mill that it was a DMO on August 3, 1994 (letter to Mr. Jay Jones). Climax Molybdenum Company — Henderson Operations (Henderson) concurred with the designation on August 31, 1994 (letter to Mr. Bruce Humphries, DMG). The DMG is now the Division of Reclamation, Mining and Safety (DRMS) and will be referred to as that agency throughout the rest of this document. The purpose of this Environmental Protection Plan (EPP) is to provide a description of environmental protection facilities for those areas that potentially could be affected or impacted by designated chemicals, toxic or acid - forming materials or acid mine drainage. The original Henderson Mine and Mill EPP was submitted as Technical Revision 04 (TR -04) to the existing Regular (112) Mining and Reclamation Permit (Number M -1977 -342). This TR supersedes TR -04 and, once approved, will become part of the existing permit. The objective of this document is to update the EPP to reflect conditions as of the date of this plan. 1.1.1. Reference and Indexing Since the Henderson Mine and Mill is an existing active operation with an approved Mining and Reclamation Permit (Permit), much of the information and data required for the EPP has been developed previously. Where such information is already part of the public record and official reclamation Permit files (modifications to the Permit via Amendment (AM) or Technical Revision (TR), correspondence with DRMS, etc.), that information is referenced but not reiterated herein. Only information that presently is not part of the public record or is required specifically under the Act is included. 1.1.2. Changes in Referenced Information and Documents Changes in the reclamation plan can trigger the need for submittal of a formal Amendment, Technical Revision, or Modification depending upon the type of change as defined by the following definitions: Technical Revision — means a change in the permit or applications, which does not have more than a minor effect upon the approved or proposed Reclamation or Environmental Protection Plan. Climax Molybdenum Company Henderson Operations October, 2012 Page 1 of 40