The Constitution site is located along Pine Creek approximately 7.5 miles south of
Pinehurst. Work at the Constitution site
was conducted by the U.S. Army Corps of Engineers (COE) through an Interagency
Agreement with EPA and BLM. The COE completed the remedial action construction
for the Upper and Lower Constitution during CY 2006. The remedy primarily
involved consolidation of mine tailings from the upper and lower mine sites
into a single capped repository at the Upper Constitution Mine.
Construction began in May 2006 and was
completed in October 2006. The construction activities focused on the mine and
mill tailings areas, remediation of the waste rock areas, the mine adit
, and stream and bank stabilization work.
Lower Constitution before Remediation
Lower Constitution after Remediation
Upper Constitution before Remediation
Upper Constitution during Remediation
Golconda Mine –
This site is located along the South Fork Coeur d’Alene River
near Wallace and is adjacent to the Trail of the Coeur d’Alenes. The remediation work at this site was
conducted in two phases. During 2006,
EPA completed the designs for both the Phase I and Phase II work. Construction
of the Phase I surface water controls was implemented by IDEQ in the spring of
2006. The purpose of this work was to drain areas of the site to enhance drying
in order to facilitate the Phase II work later in the summer. The Phase II design
included the following activities: Grading and capping of the tailings pond;
armoring the base of the waste rock pile; excavation of the tailings in the
mill area and re-location to upland capped disposal area; installation of
erosion protection on the stream bank; and revegetation of the site.
Construction of the Phase II work began in September 2006 with COE oversight. The majority of the
remedial action work was completed prior to the onset of winter weather in
December 2006. In 2007, the final grading and capping of the consolidated waste area was completed along with
site-wide hydro seeding.
Golconda before Remediation
Golconda after Remediation
Rex Mine –
The Rex mine site is located near the East
Fork of Nine Mile Creek and has historically been used for recreational
purposes and ATV use. During 2006, EPA
completed the design for the tailings dam toe buttress. The purpose of the
buttress is to provide additional stability to the steep face of the tailings impoundment.
Construction of the buttress was completed by the BLM in October 2006. The
design for the remainder of the site included the following elements:
installation of a surface/groundwater collection pond; consolidation of all
tailings on site; diversion of adit and surface water
flow (Rex Creek) away from the tailings impoundment; removal of debris and
burial of mine concentrates at the site; overall grading of the site; capping
of tailings; and revegetation. Construction for this work began during the
summer of 2007 with COE oversight.
Rex before Remediation
Rex after Remediation
This site is located along the South Fork of the Coeur d’Alene River
near Osburn and was a demonstration site developed by
the U.S. Bureau of Mines for disposal of tailings. It is currently an area actively
used for ATV use. During 2006, EPA completed
field work to characterize the site and fill data gaps for development of a
remedial action design. Design completion and construction of the remedy is anticipated in 2007.
USBM before Remediation