2010-04-06_REVISION - C1981022 ‎(3)‎

• Permit No: C1981022
• IBM Index Class Name: REVISION
• Doc Date: 4/6/2010
• Doc Name: Adequacy Review & Cost Estimate
• From: DRMS
• To: Oxbow Mining, LLC
• Type & Sequence: TR67
• Email Name: MPB
• Email Name: SB1
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
April 6, 2010
James A. Kiger
Environmental Manager
Oxbow Mining, LLC
P.O. Box 535
Somerset, CO 81434
Re: Elk Creek Mine, Permit No. C-1981-022, Oxbow Mining LLC (OMLLC)
Technical Revision No. 67 (TR 67), 2010 Exploration Borehole Plan
Dear Mr. Kiger:
COLORADO
DIVISION OF
RECLAMATION
MINING
SAFETY
Bill Ritter, Jr.
Governor
James B. Martin
Executive Director
The Division of Reclamation Mining, and Safety (Division) has reviewed the above referenced
technical revision application materials submitted for the proposed 2010 exploration borehole .
drilling program. The Division has the following adequacy review comment regarding the
proposed plan.
In the application cover letter OMLLC references typical designs for a drill pad lay out
(Permit Map 2.05-M4,4th sheet), SAE's and alternative sediment control (Exhibit 2.05-
E3,Section 9), and mud pit hydrology demonstrations (Exhibit 2.05-E3,Section 6). The
later of these references, The Exploration/Gob Vent Borehole Mud Pits Impoundment
Demonstration (Exhibit 2.05-E3, Section 6) is the only one that is truly a "typical"
design. It provides general conditions and assumptions with three hypothetical scenarios
and it is P.E. certified indicating that all temporary mud pit impoundments will be built in
this manner. This is adequate and has been approved as a typical design.
The other two demonstrations are not clearly identified in the permit application package
(PAP) as typical designs. Permit Map 2.05-M4, 4th sheet was approved in 2002 for TR-
41 for the Sanborn Creek Fan Site and four (4) degasification holes. Exhibit 2.05-E3,
Section 9 provides numerous designs including a CBM-1 Degasification Well - Drill Pad
SAE with silt fence and clean water diversion demonstration. But again this appears to
be for a specific gob vent borehole site and it is not clearly identified or certified as a
typical design.
Please provide a typical design for an Exploration Borehole drill pad SAE and
incorporate into the design a typical drill pad layout or site detail map. If Exhibit 2.05-
E3, Section 9 (CBM-1 Degasification Well) is intended to be the typical design for both
gob vent and exploration boreholes then this should be clearly stated in the PAP, the
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