2010-04-20_REVISION - M1977300 ‎(2)‎

• Permit No: M1977300
• IBM Index Class Name: REVISION
• Doc Date: 4/20/2010
• Doc Name: Environmental Protection Plan ‎(EPP)‎ Adequacy Review #1
• From: Whetstone Associates
• To: DRMS
• Type & Sequence: TR11
• Media Type: D
• Archive: No

Environmental Protection Plan, Schwartzwalder Mine 1-2
Dewatering of the spiral decline ceased in September 1998, when the pumps were shut off at the bottom of
the decline (approximately 2,200 feet), and the lower workings of the mine were allowed to refill to the 19
Level. Mining operations continued until May 2000, when the pumps were shut off on the 19 Level and 7
Level, and the mine was allowed to flood.
(b) Mine Layout
The mine was accessed through the Steve Level, which occurs at approximately 6,602 feet elevation in
North American Datum [NAD] 27 coordinates or 6,550 feet elevation in mine coordinates . Two portals
exist on the Steve Level, which provided for normal mine access (the Steve Portal) and emergency egress
(the Pierce Adit).
Several older workings were developed above the Steve Level. The Charlie and Minnesota levels, which
are 119 and 226 feet above the Steve Level, respectively, intercept the CV glory hole and represent the bulk
of the upper workings (Figure 1-1). Additionally, the Upper Level and LBJ Level daylight on the hillside.
The elevations of the upper levels are given in Table 1-1.
Table 1-1. Elevations of Upper Levels at the Schwartmalder Mine
LEVEL MINE NAD27
ELEVATION ELEVATION
Up.Per ........... ..... .............. ..... ... .......................................................................... ...........................6,947
LBJ
........................................ .......... ....................._. 6,835
.... --......................... .......... ........................... 6,887
....................... ...............................
Minnesota
: 6,776
...
................. 6,828
......................................................
.........
...................... ........................................ ..
CV _.._..._..........._...........................
..
6,739 6,791
Charlie .................... _ ....

..... ..... ............. ...._6_..669...........................

_...... -....._....... .................................. .
6,721
....................................
................................_....................
Steve 6,550 6,602
Below the Steve Level, the levels are identified according to their depth (in hundreds of feet). The most
extensive workings are on the 19 Level, with significant development on the 7, 9, and 15 through 17 levels.
The total mine depth is 2,222 feet from the Steve Level portal to the bottom of the spiral decline
The mine was ventilated through the Main and Jeffrey Shafts. The Main vent shaft extends from ground
surface at the top of the hillside (elevation 7,294 ft, NAD 27) to the 7 Level. The Jeffrey vent shaft extends
from ground surface near the Charlie level to the 11 Level. Areas that were not actively worked were
typically bulkheaded during operations, to minimize radon gas exposure.
During operations, the Schwartzwalder Mine was kept dry by pumping water from the lower levels of the
mine. Water was collected on the 19 Level, pumped to the 7 level, and then pumped to the surface where it
was treated and discharged to Ralston Creek. The water treatment plant also processed water from four
sumps in the alluvium and fill. Combined pumping from the sumps averaged approximately 100 gpm.
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4109C.100419 Whetstone Associates