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Goldmine process monitor2/20/2023 The DNR gained valuable experience in its review and oversight of the Flambeau Mine and will continue to gather additional information as monitoring of the reclaimed site continues for the next several decades. Once groundwater saturated the backfilled material, the threat of ongoing acidification was largely eliminated. Limestone, because of its neutralization capacity, was used to neutralize any acidity that developed while the rock was stored in the waste facility and also to minimize the potential for the development of acid conditions prior to reflooding. The backfilling process involved blending the stockpiled waste rock with a prescribed amount of limestone. As specified in the Reclamation Plan and Mining Permit, the open-pit was backfilled with waste rock and other materials removed during the mining process. The open-pit, copper-gold mine began operations in July 1991, and reclamation activities were substantially completed by the end of 1999. While there are other examples of successfully operated and reclaimed metallic mines in Wisconsin, the Flambeau Mine near Ladysmith in Rusk County is the only example of a metallic mine that was permitted, constructed, operated and reclaimed under the state's existing regulatory framework. Additional information regarding the industrial outlot, the petition for certification, the notice of public hearing, the draft revised mining permit and other related materials are available under the 'Industrial Outlot' tab below. The department has received Flambeau Mining Company's petition for a certificate of completion of reclamation for the remaining 32 acres of the permitted mine site, referred to as the industrial outlot.
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