Removal action at Formosa mine near Riddle to continue for next several months

BLM Roseburg District Office, June 15, 2015 (File/SBG photo)

RIDDLE, Ore. – A joint project between the Army Corp of Engineers, Environmental Protection Agency and Bureau of Land Management that will include a removal action at the Formosa Mine Superfund site near the headwaters of the Middle Creek drainage, southwest of Riddle, will continue through for the next several months.

"The BLM is committed to keeping public landscapes healthy and productive," BLM's Roseburg office said. "This removal action will include adit opening, adit rehabilitation, and installation of a flow-through bulkhead."

Officials say this removal action will be ongoing through the fall of 2018 and will include heavy equipment traffic and closed roads during portions of the project.

The overall goal of the project is to control, treat, reduce, or eliminate uncontrolled releases of hazardous metals and acidity from the Formosa 1 Adit discharge, reducing the ecological risk and human exposure, BLM says.

The Formosa Mine was actively mined for copper, gold, and silver in the 1920s and 1930s and again from 1990 to 1993.

Reclamation, including adit closure, was conducted in 1993 and 1994, but has been unsuccessful in eliminating the mine drainage from the Formosa 1 Adit.

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