aTable 1 and Fig. 1 through 5. bRittenhouse et al., Billings et al., Hitchon et al.,[100,101] Collins, Carpenter et al., Carpenter and Trout, Kharaka, Kharaka et al.,[79,105,106] Land et al., Saunders and Swann, Moldovanyi and Walter, Kyle, Lundegard and Kharaka, Hanor,[59,60,61,62,111,112] Land, Polandri and Reed. cpH = 6.0, log = -50.0 dpH = 7.5, log = -57.0 epH = 4.7, log = -51.8 fpH = 6.0, log = -50.0 gTotal dissolved inorganic sulfide defined as ∑H2S = H2S + HS- (mg L-1) and (mol kg-1). hTotal dissolved sulfate defined as the sum of all dissolved sulfate species in mg L-1() and as the molal sum of all dissolved sulfate species (∑m SO4) in mol kg -1. iMonocbx = sum of monocarboxylate anions listed in Table 2: ∑monocbx = total dissolved monocbx in mg L-1; ∑mmonocbx = total molality of dissolved monocbx in mol kg-1, jdicbx = sum of dicarbonxylate anions listed in Table 2: ∑dicbx = total dissolved dicbx in mg L-1; ∑mdicbx = total molality of dissolved dicbx in mol kg-1. kFor composite ore-brine; the metal concentration at indicated log –pH conditions. Cluster = most common values observed for modern petroleum field brines. lBDL = below detection limit; less than about 0.01 mg L-1.