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What will the pH of the water be?

We measure the pH of several different types of water. In the future mine area, surface water pH ranges from 6.9 to 8.5 (neutral to slightly alkaline), and ground water pH ranges from 6.2 to 7.1 (near neutral). Water from the reverse osmosis water treatment plant will have a pH between 6 and 9 (slightly acidic to moderately alkaline), a range that is similar to surface waters. The small amount of water that may be pumped from the cemented tailings facility could have a pH as low as 2, but it will be pumped into the much larger volume of water in the process water pond with a pH of 9 to 10, where it will be neutralized.