GENERAL46807

• Permit No: C1981013
• IBM Index Class Name: General Documents
• Doc Date: 4/30/1997
• Doc Name: VENTILATION AIRSHAFT AND MINE PROGRESS REQUEST GOLDEN EAGLE MINE C-81-013
• From: DMG
• To: JOHN TOUPAL
• Permit Index Doc Type: GENERAL CORRESPONDENCE
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
DeparlmeN of Natural Resources
1313 Sherman 51., Room 215
Denver, ColoraAo B020J
Phone: [phone]
FAX: [phone]
April 30, 1997
Mr. John Toupal
14900 Highway 12
Weston, CO 81091
RE: Ventilation Airshaft and Mine Progress Request
Golden Eagle Mine, #C-81-013
Dear Mr. Toupal:
~~
II~~~
DEPARTMEI~IT OF
NATURAL
RESOURCE
Roy Ramer
Governor
lames 5. LochheaA
&ecmive Drtecbr
M¢hael B. Long
Division Director
Enclosed please find information on file with the Division of Minerals and Geology with regazd
to the Third North Ventilation shaft and mine progress at the Golden Eagle mine.
I reviewed Technical Revision # 8 (TR-08), Technical Revision #14 (TR-14), Technical Revision
#30 (TR-30), Mine Plan Map 3 (revised 3/24/93), and the Subsidence Monitoring file containing
subsidence monitoring data. The results of this review are as follows:
The Third North Intake shaft was constructed to provide an opening where fresh
air could enter the mine workings. Intake fans bring air into the mine, as opposed
to exhaust fans, which blow mine air to the atmosphere. The Third North Intake
fan was also a point of emergency exit for the miners. This makes sense, as an
emergency escapeway needs to be a corridor where fresh air would always be
available, rather than exhaust air which could contain smoke and other toxic gases.
Intake fans openings aze also normally larger, as evidenced by this shafr and it's
16 foot, finished diameter.
To construct a mine opening of this diameter, a small diameter (typically 12 inch)
hole is drilled to penetrate existing mine workings below. Then, a large reamer
bit is attached from within the mine workings and the bit is raised towazd the
surface, with the excavated material falling into the workings, where it is removed
and stored underground or brought to the surface to a mine waste pile. The point
of this discussion is that in order to conduct this activity, underground mine
workings must be established below [he point on the surface where the intake fan
will be placed. The activity to drill this large shafr was approved by the Division