HANOVER, New Hampshire, Aug. 25 (TNSres) -- Dartmouth College issued the following news release: * * * Study reveals the global scale of mining's detrimental impacts on the environment. * * * Gold and mineral mining in and near rivers across the tropics is degrading waterways in 49 countries, according to a Dartmouth-led study published in Nature this week. The findings represent the first physical footprint of river mining and its hydrological impacts on a global scale. River mining often  more