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Table 3 Water chemistry from Soudan Mine. No significant differences were found for Ca, Mg, Na, K, Li, Al, Mn, Sr, Ba, Si, Cr, Co, Ni, Cu, Zn, As, Se, Rb, Cd, Cs, Pb, total alkalitity, lactate, acetate, formate, chlorate, oxalate, and trace elements.

From: Using pyrosequencing to shed light on deep mine microbial ecology

  Black Red
Temp (°C) 10.9 10.9
pH 6.70 4.37
redox (mV) -142 -8
Fe (ppm) 161.5 146.3
Total N (ppm) 1.510 1.280
   • NH4 1.22 0.91
   • NO3 0.29 0.36
   • NO2 <0.10 <0.10
SO4 (ppm) 27.4 29.4
PO4 (ppm) 4.1 1.8
B (ppm) 186 70
Mo (ppm) 2.59 0.68
W (ppm) 3.82 0.91
Tl (ppm) 1.90 0.52
U (ppm) 1.01 0.20