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The Spring Creek Dam was later deemed "undersized" for the Spring Creek watershed, as the large flows of both natural drainage and acid mine drainage caused frequent uncontrollable spills at the dam.
The spills contain many volatile components in acid mine drainage, which include the most acidic naturally occurring (i.e. Several alternatives were considered for remediating this problem: In 1985, it was found that water seepage into the foundations of the Spring Creek Dam could possibly cause its collapse.
Several concerns about the structural integrity and safety of the dam, both physically and biologically, arose in the 1990s.
Emergency releases from Shasta Lake, often in the value of thousands of acre feet of water, have occurred from time to time to dilute massive acid spills from the Spring Creek drainage.
The ownership was transferred to Mountain Mines Ltd., a London company, in 1894.
At the very end of the 19th century, Iron Mountain Mine took blames for several fish kills in the Sacramento River.
Bureau of Reclamation, serves primarily to collect severe acid mine drainage stemming from the Iron Mountain Mine.
Nevertheless, mining activity continued, and by 1928, 600 tons of ore were being extracted from the site per day....[acid mine drainage is] most vividly illustrated by the problems at the Iron Mountain Mine in California.
...release of this waste resulted in virtual elimination of aquatic life in many of the creeks surrounding the Iron Mountain Mine site.
The dam and reservoir, along with other treatment structures built at and below the mine, have successfully reduced the dry weather pollution of Spring Creek by up to ninety-five percent.
Problems, though, still occur mainly in the form of large uncontrolled spills from the reservoir.
Shortly after the discovery, a controversy over the irregular spills of mine toxins from the dam began in the 1990s.