2002-07-08_PERMIT FILE - M2002004

• Permit No: M2002004
• IBM Index Class Name: PERMIT FILE
• Doc Date: 7/8/2002
• Doc Name: RESPONSES TO PRELIMINARY ADEQUACY REVIEW
• From: GCC RIO GRANDE
• To: DRMS
• Media Type: D
• Archive: No

Mr. Al Amundson
Mr. Anthony J. Waldron
Environmental Protection Specialist
State of Colorado
Department of Natural Resources
Division of Minerals and Geology
July 8, 2002
Page 3
B. 6.4.4 EXHIBIT D — MINING PLAN
{80600:1}
9. GCC Rio Grande, Inc. has amended the affected area boundary. Total area
remains the same as the original permit application. Revised Exhibit C -2.
1. (page 4) - Attached new Exhibit D -1 is a schematic of the mine operation that
illustrates mining and reclamation activities and the sedimentation control plan in
Year 8. The maximum footprints of overburden and topsoil stockpiles are shown
on Exhibits D -1 and D -2. Attached new Exhibit D -2 illustrates the status of
reclamation efforts at the end of the eighth year of mining Both figures illustrate
the location of potential stockpiles. Note that the areas illustrate the maximum
possible stockpile footprint, and that not all of the area may be used for stockpiles.
Significant portions of the stockpile illustrated in the area outside of mining years
4 and 5 will be removed during reclamation of the Years 1 through 5 mining
panel. The stockpile footprint for year 6 pre - stripping will be located above the
Year 15 mining block, which is not illustrated on Exhibits D -1 or D -2.
2. (page 4) - Attached new Exhibit D -3 illustrates detailed design elements for the
surface water management plan. Exhibit D -3 shows the locations of in -pit
sediment/detention ponds, clear -water diversions for the mine and plant site,
arroyo protection measures, reconstructed arroyos, culverts for the access road
and railroad spur, sediment and detention pond for the plant area, plant area storm
sewer system, and other pertinent features. These facilities are further described
in revised Exhibit D for the mining permit application and the detailed report
provided in Appendix F of the Application titled "Surface Water Management
Plan." These supplemental documents address how storm water will be passively
discharged and flow unimpeded back into the St. Charles River, and how the
arroyo watersheds are restored.
3. (Page 4) - GCC Rio Grande does not plan to use storm water for dust control.
Should GCC Rio Grande, however wish to do so, it would first obtain a suitable
augmentation plan. However, given the present plan, references to such use have
been removed from the application.
4. (Page 5) - The final reclamation contours were designed to not impound water;
however, attached revised Exhibit F -1 is submitted based on an alternative final
reclamation and drainage philosophy that restores all of the disturbed arroyos, as
discussed on pages D -12 and D -13 and the detailed report provided in Appendix F
of the Application titled "Surface Water Management Plan."