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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 COLORADO <br />DIVISION O F <br />Phone: (303) 866-3567 permit #: M1977247 Confidential?: NO RECLAMATION <br />FAX: (303) 832-9106 MINING <br />Doc. Type: Memo to File - &- <br />From: DRMS To: File SAFETY <br />Doc. Name: Stratigraphy of the Coaldale gypsum deposit <br />Doc. Date: 9-12-2007 Bill Ritter, lr. <br />.SpeClahSt: ACS Governor <br />Harris D. Sherman <br />Executive Director <br />Ronald W. Cottony <br />Division DirecYOr <br />MEMO TO FILE Natural Resource Trustee <br />Date: September 12, 2007 ~~- ,~ ~- <br />Specialist: Allen Sorenson Signed: ~~ <br />Subject/Operator/Operation/File No. Stratig_raphy of the Coaldale Gypsum Deposit, Holcim (USA <br />Coaldale Quarry. Permit No. M-1977-247 <br />Type of Interaction: Meeting Phone Other <br />Person(s) contacted and affiliation: Kris Shurr, Coaldale Resident <br />Summary and Resolution of Interaction: <br />Ms. Shurr called on September 12, 2007 and requested information on the nature of the overburden and <br />interburden that will be mined to extract the gypsum from the bedded deposit at Coaldale. The Colorado <br />Land Reclamation Act at 34-32.5-112(8), C.R.S. allows Operators to keep information relating to the <br />nature of an ore body confidential, so the most detailed information in the permit file relating to the <br />overburden and interburden is not available for public view. However, a description of the rock to be <br />mined is provided in this memo. <br />The Coaldale gypsum deposit is hosted by the Pennsylvanian age Minturn formation. These are <br />sedimentary rocks deposited in the Central Colorado Trough and derived from erosion of the ancestral <br />Rocky Mountains to the east and west of the trough. The Minturn Formation outcrops in numerous <br />locations in Colorado and has been extensively studied. At Coaldale, the gypsum is bedded in limestone, <br />calcareous (chalky) shale, and arenaceous (sandy) shale and limestone. These rocks have not shown any <br />indication of toxicity to the ecosystem in the past, and there is no reason to believe that they will in the <br />future. <br />cc: Kris Shurr <br />Carl Mount, DRMS (via email) <br />c:\acs filesVviy Documents 4-19-06 Ihiv\coaldale stratigraphy mtf doc <br />Office of Office of <br />Mined Land Reclamation Denver Grand Junction Durango Active and Inactive Mines <br />