2008-04-15_REVISION - M1980244 ‎(368)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 4/15/2008
• Doc Name: VOL VII APP 11 Reclamation Cost Model to Support MLEP
• From: CC & V
• To: DRMS
• Type & Sequence: AM9
• Media Type: D
• Archive: No

ASSUMPTIONS
• CRIPPLE CREEK ~ VICTOR (CC&V) GOLD MINING COMPANY MINE LIFE EXTENSION
2008 RECLAMATION COST ESTIMATE
1 Drawings & Autocad files of facilities were provided by CC&V staff to Ellis Environmental Engineering, Inc.
for use in calculating acreages, plotting haul routes, and measuring perimeters for purposes of the cost
estimate. It is assumed these maps and drawings are correct. The accuracy of the reclamation cost
estimate is no better than the accuracy of the maps.
2 For the Division of Reclamation Mining and Safety (DRMS) cost estimate, Rule 6 section 6.34(2) requires
costing for reclamation at the point of maximum disturbance. It has therefore been assumed for this
exercise that final build-out of the pits, valley leach facility, and overburden storage areas will be the
point of maximum disturbance. The reclamation and closure costs are based on these areas.
3 No salvage value for equipment, buildings, or tanks has been figured into the reclamation cost model.
Recent experience at Climax Mine in Colorado by Ellis Environmental Engineering (EEE) indicates that
on large scale reclamation projects, building demolition can be paid for by the scrap metals recycled.
4 For the present cost estimate, backfill grading (2H to 1 V) has been shown for most areas of the
Main Cresson Pit. It is assumed the South Cresson Pit will be left open after mining. Fencing will be
used to prevent unauthorized entry into open pits following closure.
It has been assumed that other pits (East Cresson Altman, Wildhorse and Wildhorse Extension) will be
backfllled, and reclamation will consist of light grading to blend with the topography, growth medium
replacement to a depth of 6 inches, and revegetation.
5 The Schist Island Pit of the North Cresson and the western portion of the Globe Hill Pit in North Cresson
• will be treated as follows: light grading to blend with the topography, growth medium replacement to a
depth of 6 inches, and revegetation.
6 Trees will be planted on reclaimed slopes that are east ornorth-facing in aspect.
7 It has been assumed that no liming will be required to enhance the revegetation success, except as .
shown for ECOSA.
8 The present model assumes there will be no off-load storage of leach materials as in other cost estimates.
9 The cost for chemical closure of the VLF was provided by others and EEE simply incorporated it into the
current model. De-nitrification of the spent ore is not covered as in previous cost estimates.
10 It has been assumed that costs for equipment, provided by sources such as Wagner Equipment's
posted rental rates on the web and Means 2008 Heavy Construction Cost Data, are accurate and
applicable to this project. Some costs were taken from previous CC&V reclamation cost models and
simply inflated to 2008 dollars. A few minor costs were estimated by EEE.
11 Equipment selection to achieve the work outlined in this estimate and the productivity of this equipment
are based on EEE's 35+ years of experience in mine reclamation. Productivities were verifed using such
sources as the 36th Edition of the Caterpillar Pertormance Handbook or time studies of real-life projects
in the files of EEE.
12 Other facility-specific assumptions are listed on the various worksheets.
MDE (4-2-OS)
Rev (4-4-08)