Yes. Wet weather may have also played a role in the 1998 Pit wall slough that sent about 3 million tons of rock and dirt into the water. Rising groundwater saturated and gradually weakened that section of the southeast wall, eventually causing it to break away. Montana Resources, Inc. (MR) is taking steps to stabilize the piles of waste rock […]

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Active Mining in Butte and the Berkeley Pit


PitWatch Issue Volume 3, Number 1 (1998) We can explain some, but not all, aspects of the relationship between the Berkeley Pit and Montana Resources (MR), the corporation actively mining here in Butte. As you may recall, last year MR and ARCO hammered out an agreement on Berkeley Pit clean-up responsibilities, but the details were not made public. Here’s what […]

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The Record of Decision (ROD) is a public document that explains which cleanup alternatives will be used to clean up a Superfund site. The ROD for sites listed on the NPL (NPL Site Listing Process) is created from information generated during the Remedial Investigation/Feasibilty Study (RI/FS). The ROD for the Butte Mine Flooding Operable Unit, which includes the Berkeley Pit, […]

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