REV106788

• Permit No: C1996084
• IBM Index Class Name: Revision
• Doc Date: 5/16/2001
• Doc Name: Memo from Byron to file
• From: DMG
• To: FILE C-96-084 PR-01
• Type & Sequence: PR1
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Deparlmenl o(Nawral Resources
131 i Sherman 51., Room 215
Drnver, Colorado 80?03
Phone: [phone]
FAX: [phone]
Interoffice MEMORANDUM
~~t?1
DIVISION OC--~m
MINERAL'.::
& I
G EOLOGtiI~I.
R EC LAM ATIO tJ"
MINING•SAFETY~
Bill Owens
to: File, C-96-084, PR-Ol eovemor
from: Byron G. Walker .,,/ ereR E. Wzlcner
Execulivc D~reclor
subject: Review for Compliance, Permit Revision (PR) O1, Mine Plan Revisions Loren~~tol s inns
Canyon Mine Division Dueaur
date: May 16, 2001 (review for completeness)
reference: e-mail, May 14, 2001 2:03 PM, Gorham to Walker, Sub: Lorencito PR-O1
Introduction The Lorencito Coal Company (LCC) submitted an application for a permit revision
(PR)to Permit C-86-084 to change the mine plan. This review addresses selected geotechnical
items with regazd to completeness and adequacy in accordance with Rules 2.05.3(6) [and (b) of
same] and applicable portions of Rules 4.09 and 4.10. Only the first 5-year permit term is
reviewed.
Rule 2.05.3(6) Overburden. A rmrrativel and appropriate rnnpsZ explaining the removal3,
handling° and storages of all overburden material in the permit Wren. Each narrative should
include pit dimeresions6, overburden volumes and swell factorx anticipated for each phase of the
proposed operation. Permmlent excess spoil disposal structures shall comply with 2.05.3(6)(6)9.
Temporary overburden disposal (storage) strlccn~res shall comply with the applicable
performance standards of Rule 41 °; injnrmation to demonstrate such compliance shall include, i(
applicable, locationll, geometry) ~, and method)' of material placement. If appropriate jor the
proposed operation, each plan should a/so include:
I Narratives are provided as indicated in the following superscripts.
'` Appropriate maps are provided (see Maps 2.05.3-1).
Removal is explained. Both Mountaintop Removal Mining and Steep Slope Mining is
described. The descriptions include equipment mixes. See pages 2.05-1 to 2.05-11. Topsoil is to
be salvaged. A description of cut sequences is provided on pages 2.05-6 through 2.05-9.
° Handling is explained. Overburden will be moved by a combination of methods, which include
dozers, loader and truck, and cast blasting [par. (2) page 2.05.3].
s Storage of topsoil is stated (page 2.05-3). It is described on page 2.05-33a through 2.05-35. A
statement is made on page 2.05-36 that "Materials to be stockpiled are summarized in Exhibit
16." Exhibit 16 is a description of overburden calculations. No proposed temporary stockpiles of
overburden were noticed in this review. Numerous permanent fills are presented.
6 Cross-sections of Hilltop sections are provided. There are a few examples of pits, but the
application does not address open-pit surface mining.
~ Exhibit 16 contains overburden volume calculations.
a No swell factor was identified in this review.