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1997-04-30_GENERAL DOCUMENTS - C1981013
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1997-04-30_GENERAL DOCUMENTS - C1981013
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Last modified
2/26/2021 8:24:09 AM
Creation date
2/13/2008 10:36:02 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981013
IBM Index Class Name
GENERAL DOCUMENTS
Doc Date
4/30/1997
Doc Name
Letter Enclosing Information on Vent Shaft and Mine Progress
From
DMG
To
John Toupal
Permit Index Doc Type
General Correspondence
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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s <br /> STATE OF COLORADO <br /> DIVISION OF MINERALS AND GEOLOGY PFV7, <br /> � <br /> Department of Natural Resources <br /> 1313 Sherman St.,Room 215 <br /> Denver,Colorado 80203 <br /> Phone:(303)866-3567 V011A <br /> FAX:(303)832-8106 <br /> DEPARTMENT OF <br /> NATURAL <br /> RESOURCES <br /> April 30, 1997 Roy Romer <br /> Governor <br /> James S.Lochhead <br /> Executive Director <br /> Mr. John Toupal Michael B.Long <br /> 14900 Highway 12 Division Director <br /> Weston, CO 81091 <br /> RE: Ventilation Airshaft and Mine Progress Request <br /> Golden Eagle Mine, #C-81-013 <br /> Dear Mr. Toupal: <br /> Enclosed please find information on file with the Division of Minerals and Geology with regard <br /> to the Third North Ventilation shaft and mine progress at the Golden Eagle mine. <br /> I reviewed Technical Revision# 8 (TR-08), Technical Revision#14(TR-14), Technical Revision <br /> #30 (TR-30), Mine Plan Map 3 (revised 3/24/93), and the Subsidence Monitoring file containing <br /> subsidence monitoring data. The results of this review are as follows: <br /> 1. The Third North Intake shaft was constructed to provide an opening where fresh <br /> air could enter the mine workings. Intake fans bring air into the mine, as opposed <br /> to exhaust fans, which blow mine air to the atmosphere. The Third North Intake <br /> fan was also a point of emergency exit for the miners. This makes sense, as an <br /> emergency escapeway needs to be a corridor where fresh air would always be <br /> available, rather than exhaust air which could contain smoke and other toxic gases. <br /> Intake fans openings are also normally larger, as evidenced by this shaft and it's <br /> 16 foot, finished diameter. <br /> To construct a mine opening of this diameter, a small diameter (typically 12 inch) <br /> hole is drilled to penetrate existing mine workings below. Then, a large reamer <br /> bit is attached from within the mine workings and the bit is raised toward the <br /> surface, with the excavated material falling into the workings, where it is removed <br /> and stored underground or brought to the surface to a mine waste pile. The point <br /> of this discussion is that in order to conduct this activity, underground mine <br /> workings must be established below the point on the surface where the intake fan <br /> will be placed. The activity to drill this large shaft was approved by the Division <br />
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