2012-08-10_PERMIT FILE - C1981018A

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IV.K Signs and Markers The primary means of marking the perimeter of the Permit Area will be with GPS technology. The 'Perimeter Markers' will consist of a computer file of standard GPS transfer format or other format acceptable to the Division accurately depicting the Permit Area boundary. This file will be provided to the Division for entry into GPS units. This GPS Perimeter Marker file will be updated and maintained by the operator until final bond release. The advantages of maintaining the perimeter marker system in the form of a GPS data file shared with the Division is that: • It makes efficient use of and does not waste resources. • Has no adverse visual impact on the aesthetic qualities of the land. • Is easily maintained and updated. • Cannot be changed by the operator without the Division's knowledge. • Is accurately extrapolated between points. • Does not increase the financial liability. • Does not complicate final bond release with marker removal issues. • Is appropriate for the Deserado Mine considering the remote and dispersed nature of disturbances. There can be instances where physical perimeter markers are appropriate at the Deserado Mine. When land disturbing activities approach the permit area boundary physical markers serve to warn the land disturbing equipment operators not to venture outside of the designated area. Physical perimeter marker posts will consist of white PVC pipes, a minimum of four feet in length, placed over steel posts or rebar or maintained in a vertical position by other substantial means. Each marker must be visible from each adjacent marker. Additional markers may be warranted depending on the proximity of the mine activity, character of the mine activity, and other physical features between the operations or facilities and the permit area boundary. Perimeter marker posts will be placed at points at or between the permit area boundary and the edge of approved areas affected by land disturbing surface operations or facilities where such areas: • are within 200 feet of the permit area boundary, and • no substantial stream, road, fence, or similar feature substantially aids in limiting off -site impacts nor provides a visual landmark for the operator between the operations or facilities and the Permit Area boundary. For the purpose of placement of perimeter marker posts "areas affected by surface operations or facilities" do not include exploration holes or power lines and their associated disturbances. Perimeter marker posts must be maintained until no additional ground disturbing activities are foreseen which could reasonably lead to offsite disturbances. This will usually be when surface Minor Revision #147 (05/2011) IV -4 3