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iii iiiiiiiiiiiiiiii <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Phone: (303) 866-3567 <br />FAX: (3031832-8106 <br />July 21, 1993 <br />TO: Dave Berry <br />FROM: Janet Binns~\~ <br />RE: Colowyo (CS1-019) Proposed Postmining Contour Changes (TR-22). <br />OF COQ <br />,~~ R <br />Nc <br />'•~.,~~ <br />Roy ROmer <br />Governor <br />Michael 8. Long <br />Division Director <br />Colowyo has proposed to modify the post-mining contours at the Colowyo mine. One <br />significant change to this is the creation of an additional drainage to the reconstructed <br />Streeter Gulch drainage. Since Susan Morrison will be out of the office for several weeks, <br />Larry Routten wanted to pass this through you to ensure the operator has sized, protected, <br />and designed this drainage appropriately. <br />The operator submitted Maps 19, 20a, 33„ and 33a. I have pencilled in the previously <br />approved contours on Map 19. The proposed drainage did not exist prior to mining. <br />Please take a quick look at the submittals and let me know (preferably by July 22, 1993) <br />what additional information you need the operator to submit. I would like to know if the <br />orientation of the drainage and the confluence angle would be appropriate. The slope to <br />the south of the "West Tributary to Streeter Gulch" appears rather uniform. Do you <br />perceive problems with this configuration? <br />STATE OF COLORADO <br />Thanks <br />