2010-12-09_REVISION - M2008017

• Permit No: M2008017
• IBM Index Class Name: REVISION
• Doc Date: 12/9/2010
• Doc Name: Adequacy Review-02 Comment Responses
• From: J&T Consulting, Inc.
• To: DRMS
• Type & Sequence: TR1
• Email Name: MAC
• Media Type: D
• Archive: No

JET Consulting, Inc.
December 7, 2010
Cllr. Michael Cunningham
State of Colorado
Division of Reclamation, Mining, & Safety
1313 Sherman St., Room 215
Denver, CO 80203
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RE. Broken Arrow Investments, LLC, Derr Pit, File No. M-2008-017, TR-01 Adequacy
Review - 02 Comment Responses
Dear Mr. Cunningham,
J&T Consulting, Inc. and Broken Arrow Investments, LLC have reviewed the adequacy review
comments. We discussed the comments during a phone conversation with you on December 6`n
to ensure that the responses we are providing in this letter along with revised exhibits would
address the comments adequately. Thank you for taking the time to discuss the comments as it
was very helpful in clarifying the concerns the Division of Reclamation, Mining, and Safety had
with our Technical Revision Request No. 1. The following are our responses to each of the
numbered comments you provided in your November 19, 2010 review letter:
6.4.4 Exhibit D - Mining Plan
1. The Applicant has indicated the mining face will be near vertical during the wet
mining phase of the operation. Please indicate the maximum depth of the
excavation upon completion of the wet mining phase.
Response:
The maximum depth of mining depth will be 85 feet, however the operator may
decide to install the slung wall prior to reaching the maximum depth.
2. Please provide a detailed description of the mining methods which will be
used to reduce the vertical highwalls to a 3HAV slope during dry mining
operations.
Response:
The vertical highwalls will be reduced during the wet mining using the drag line to
take the slope down to a flatter slope of 1 H:1 V or 1.5H:1 V. Dozers will be used to
push material down the slope to create a 3H.- IV slope during dry mining operations.
6.4.12 Exhibit L - Reclamation Costs
3. The Applicant's reclamation cost estimate does not include a cost for grading
the vertical mining face to 3H:1V for Phases 2-4. The Division must bond for
the worst-case scenario for each phase of mining. If the Division had to
reclaim the site at the end of wet mining Operations for Phases 2-4, then the
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