Summary Information
(last updated on: 8/13/2018 2:23:53 PM)
[June 2013] EPA placed the site on its National Priorities List (NPL, or Superfund) in September 2007, and is now the lead agency performing CERCLA removal and remedial actions. Since June 2008, DEQ has been providing limited, ongoing support to EPA and its contractor CDM in the technical evaluation of the site, PRP investigations, stakeholder involvement, and cleanup decision-making. DEQ staff have supported EPA in site visits, contractor meetings, acid mine drainage conference discussion about the Formosa Mine, and consultations for the PRP investigation.

To obtain documents and more details about this site, see the link below for EPA's Superfund information page for Formosa Mine.
General Site Information
Site: champion mine (ECSI Site ID: 1449) CERCLIS (EPA) Id001002616
Project Manager: Bryn Thoms Investigative Status:Listed on the Confirmed Release List or Inventory
PM Phone: (541) 687-7424 NPL(National Priority Listing):Yes
Address: 31S/6W/S26b Is this site an Orphan?Yes
, Is this site a brownfield?No
County: DOUGLAS Action Underway or Needed: REMEDIAL INVESTIGATION
Region: Western Region Click for more details ...  
Site Documents
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File NameCategory File Size MB Document Date Upload Date
Formosa (Silver Butte) Mine Orphan Declaration.pdf Memos 0.8813 3/15/2000 8/3/2018
Formosa Treatability Study_Tech_Memo_Final_06122014.pdf Reports 11.8713 6/12/2014 10/28/2019
Final2016EPAFormosaOU1RecordDecision.pdf RODs/Staff Reports 9.6369 4/18/2016 9/18/2017
Site Links
Click the link to open the web page.
Formosa Mine: Douglas County, Oregon | Region 10 | US EPA EPA Superfund site page for Formosa Mine

Click on the Photograph to see a larger version.

An example of acid mine drainage from the former Formosa Mine site
Acid mine drainage from the former Formosa Mine has led to a dead zone in the south fork of Middle Creek.
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