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Schwartzwalder Mine -Hydrologic Evaluation of Mine Closure and Reclamation 121
<br />Table 33. Locations of Underground Water Quality Samples
<br />Station Name Mine Level Northing _ Easting Elevation ;Description
<br />MILAN i Minnesota ~ 732,148.0 2,061,436.0 ° 6832.0 ;Minnesota level, near Glory Hole
<br /> I Level ~
<br />~
<br />I `
<br />~
<br />Wash Steve Level _.__.._.._._._._........__._..
<br />732,406.0 ~ 2,061,624.0 6608.0 Steve level: seeps from Washington chutes
<br />CO Steve Level 732,144.0 2,061,443.0 6600.0 Steve level: Colorado drift bulkhead
<br /> _
<br />- Steve level: seeps from boards in Illinois
<br />ILLRS Steve Level 732,280.0 2,061,551.0 6609.0
<br /> raise
<br />Steve Adit ~ Steve Level i
<br />
<br />I I 732,280.0 I
<br />
<br />I 2,061,551.0 i
<br />
<br />I 6609.0
<br />Steve level: seeps from boards in Illinois
<br />~
<br />I raise (assumed location)
<br />146 ;Steve Level ` 732,078.0 2,061,399.0 6601.0 'Steve level: pond behind air regulator
<br />2Adit n/a ~ _
<br />733,353.0 2,061,111.0 6601.0 'Pool behind berm
<br />2A n/a .
<br />733,368.0
<br />: 2,061,001.0 ' 6573.0 Rt heading in decline, below intersection
<br />700ILL _
<br />700 ~ __
<br />_
<br />732,435.0_; 2,061,323.0 5871.0 ~ Fracture (along Illinois Fault)
<br />779 _
<br />- 700 731,980.0_: 2,059,953.0 5866.0 :Pool (composite sample from pool)
<br />7J2 700 ~ _
<br />731,974.7 _ 2,059,926.7: 5887.6 ~ Corehole, intermittent flow (drip/low flow)
<br />1108 1100 _
<br />2,283.0 _
<br />7_3 2,061,263.0 5459.0 :Bulkhead (composite)
<br />i5B 1500 _
<br />732,223.0: 2,061,001.0 € 5040.0 ~ Bulkhead composite
<br />15B13 1500 732,252.2: 2,060,996.2: 5043.6 =Corehole at drill station 15B
<br />16G 1600 ~ 732,038.0 2,059,681.0 ~ 4950.0 :Corehole flowing through muck F(_e ppt~_
<br />1730 1700 ~ 731,698.0: 2,060,108.0 4851.0 Leyner hole _ _.
<br />19D15(Fe) 1900 29.3
<br />731,6 2,060,770.7: 4613.5 ;Corehole at drill station 19D, Fe staining
<br />19D16(Mn) _
<br />- 1900 _
<br />_
<br />__
<br />731,628.
<br />7 _ 2,060,771.7 4613.0 ;Corehole at drill station 19D, Mn staining
<br />19C 16 _
<br />1900 _
<br />_731,74_2.7_ 2,060,370.7 4607.4 ~ Corehole at drill station 16C
<br />1955 Decline 1955 31,548.0
<br />7 2,060,588.0: 4605.0 :Standing water
<br />JOS2026 2000 ;_ _
<br />_
<br />_
<br />_7_31,6_15_.0 _~
<br />T T
<br />~ 2,060,206.0 ~ 4612.0 ~ Stope water (Johnson Ore Shoot)
<br />RMW n/a ° n/a n/a = n/a :Raw mine water
<br />RMW&S _ _
<br />n/a _
<br />___
<br />u n/a
<br />^ n/a n/a :Raw mine water plus sumps
<br />UGM _
<br />n/a __
<br />_
<br />_ _
<br />n/a ~ n/a n/a Bottle roll on underground low-grade muck
<br />Note: Northing and Basting given in State Plane coordinates, elevation is NAD 27
<br />7.6.1 Deep Mine Water
<br />The chemistry of water in the underground mine varied with location during operation. Water flowing into
<br />the mine along discrete structures (e.g., the Johnson Ore Shoot, the Illinois Fault, or the West Rogers Fault)
<br />and at different levels was observed to have different chemical characteristics (Table 34). In general, water
<br />seeping into the deeper levels of the mine was swell-buffered magnesium-calcium-sulfate, calcium-
<br />sodium-sulfate, or sodium-sulfate type (Figure 40) with moderate to high dissolved solids (507 to 6,990
<br />mg/L) and alkaline pH (7.5 to 9). Concentrations of sulfate (460 mg/L median concentration) gross alpha
<br />radiation (3,000 pCi/L median concentration), and gross beta radiation (450 pCi/L median concentration) in
<br />deep mine water generally exceeded their respective groundwater standards of 250 mg/L, 15 pCi/L, and 8
<br />pCi/L. The trace metal content of the water was variable with some locations showing elevated uranium
<br />(up to 180 mg/L) and molybdenum (up to 4 mg/L) concentrations. The highest uranium and molybdenum
<br />concentrations were observed on the 700 level and were associated with standing pools (779) or fractures
<br />along the Illinois fault (700I11). Water from the deeper workings also displayed sporadic concentrations of
<br />nitrate (40 mg/L maximum), antimony (0.151 mg/L maximum), iron (1.3 mg/L maximum), and manganese
<br />(0.34 mg/L maximum) which exceeded groundwater standards.
<br />4109B.071116 Whetstone Associates •
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