标题：Monitoring and profiling of artisanal and small scale mining at Rogongon : effects on the physico - chemical a nd biological characteristics of surface water and mercury concentration in sediments of Mandulog River system
期刊名称：Advances in Environmental Sciences - International Journal of the Bioflux Society
印刷版ISSN：2066-7620
电子版ISSN：2065-7647
出版年度：2014
卷号：6
期号：3
页码：183-193
出版社：Bioflux
摘要：Small scale and artisanal mining are everywhere in the Philippines which made people think of it as dirty and dangerous, thus sho uld be discouraged due to its negative environmental and social impacts. Mining inventory at Rogongon, Iligan City , and along the Mandulog River system was conducted. There were seven abandoned, one legal, and one unregistered small scale mining entities f ound in the area; and five groups and 15 individu als of artisanal riverbed miners were found active during the investigations. The effects of these mining activities were analysed through the physico - chemical and biological characteristics such as: pH, tem perature, dissolved oxygen, biological oxygen demand, total dissolved solids, total suspended solids of surface water including mercury concentration in sediments of Mandulog River. Water samples were collected during wet and dry weather at nine (9) sampli ng points located near small scale mining area, tributaries and down to the mouth of the r iver and the sea of Iligan Bay. The results of the physico - chemical and biological parameters of the surface water suggest that the Mandulog Ri ver system conforms to the classification as Class C . The river was classified as Class D by the Department of Environment and Natural Resources Region X due to the mercury concentrations in sediments of the river even if it is lower than the standard which is 200 μg kg - 1 (0.2 μ g kg - 1 ) ; thus implies mining wastes being flushed to it
