Canada's Quadra Mining said the first quarter copper output from its Carlota mine near Miami, Arizona, will be less than expected due to a series of rain storms, the first in 300 years.
The company, however, said the event will not affect its 2010 production guidance of 250 million pounds of copper.
The rain storms caused excess water to accumulate in the bottom of the Carlota pit and in several other stormwater containments.
The leach pad's excess water has been pumped into an engineered containment expanse in the pad footprint.
The company said it is keeping the regulatory agencies up to date on stormwater management activities, which started right after the end of the storm.
The company said there are no reportable spills applicable under the federal, state and local reporting prerequisites.