GENERAL44278

• Permit No: M1984014
• IBM Index Class Name: General Documents
• Doc Date: 7/25/2005
• Doc Name: notice of determination
• From: dmg
• To: cotter corporation
• Permit Index Doc Type: DMO
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY `~
Department of Natural Resources
1313 Sherman St., Raom 27 5 C O L D RA D O
Denver, Colorado 80203 DIVISION O F
Phone: [phone] MINERAL S

fAX: [phone] G E O L O G Y
0.ECLA NATION•MININO
SAFETY•SCIENCE

July 25, 2005 Bill pwens
Governor
Mr. Glen Wllllams ~ Executive D rector
Cotter Corporation Ronald W. Cattany
P. Q. BOX 700 Division Director
Nucla, Colorado 81424 / Natural Resource Trustee
v /
RE: Notice of Determination That Cotter Operation, File No. M-1988-014, Also Known as
JD-8 MINE, is a Designated Mining Operation (DMO)
Deaz Mr. Williams:
As a result of a review of Cotter operational conditions, to include pertinent site geology and
geochemistry, associated materials being or to be extracted, chemicals and reagents proposed for
use or in use, and other applicable file documents, the Division has determined that your
proposed or existing operation, File No. M-1988-014 is a Designated Mining Operation (DMO).
This determination is made in conformance with the provisions of Rule 7.2 of the Minerals Rules
and Regulations of the Colorado Mined Land Reclamation Board. Specifically, the determination
that your operation is a DMO is based on the following:
The Act at 34-32-103(1) defines "acid or toxic producing materials" as "natural or
reworked earth materials having acid or toxic chemical and physical
chazacteristics: ' The results from SPLP tests submitted June 28th, 2005 indicate
that waste rock from the JD-8 Mine have a potential to release metals in
concentrations that exceed ground or surface water standards for aluminum,
arsenic, lead, and selenium. Thus, these rocks would be considered "acid or toxic
materials" under the definition. The noted SPLP test was conducted on waste
rock from the JD-9 MINE. Based on an agreement between DMG staff and
Cotter, test results for the JD-9 aze representative for the JD-6, JD-8 and JD-9 due
to their close geographical proximity and mining of the same geological
formations.
• The Act at 34-32-103(3.5)(a)(II) defines a "designated mining operation" to be "a
mining operation at which acid- or toxic-forn3ing materials will be exposed or
disturbed as a result of mining operations." Mining will expose or disturb acid-or
toxic-forming materials from the JD-8 waste rock. Thus, the JD-8 Mine, meets
the criteria for a designated mining operation.
Office of Office of Colorado
Mined Land Reclamation Active and Inactive Mines Geological Survey