Water hardness

Indicator of the concentration of alkaline salts in water, mainly calcium and magnesium, as a measure of water quality.
This category is also used for hardness (water).
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Preliminary report on water quality associated with the abandoned Fontana and Hazel Creek mines, Great Smoky Mountains National Park, North Carolina and Tennessee

Water properties and water chemistry in an area containing abandoned mines where mine drainate is a concern.

Environmental characteristics of the abandoned Greenwood Mine area, Prince William Forest Park, Virginia; implications for mercury geochemistry

Water quality data for the area include pH, dissolved oxygen, alkalinity, total acid soluble and dissolved major and trace element concentrations for sites around the mine workings.