Hover over the interactive map below to learn more about the individual Operable Units and Remedial Design Units of the Anaconda Smelter NPL site or click on the links in the list below.

Mill Creek OU and OW/EAD OU Mill Creek OU and OW/EAD OU OW/EAD OU Flue Dust OU OU - Community Soils RDU 9 - Fluvial Tailings RDU 9 - Fluvial Tailings RDU 3 - Smelter Hill Uplands Dutchman Creek High Arsenic Area RDU 8 - Opper Ponds RDU 10 - Warm Sprins Creek RDU 6 - South Opper RDU 5 - Active Railraods Blue Lagoon RDU 15 - MT Haggin RDU 14 - Smelter Hill Facilities West Galen Expansion Area RDU 7 - NorthOpper 4 - Anaconda Ponds RDU 12 - Slag RDU 13 - Old Works WMA RDU 10 - Warm Spring Creek RDU 2 - Lost Creek RDU 1 - Stucky Ridge

The Operable Units (OU) and associated Remedial Design Unites (RDU) within the Anaconda Smelter NPL site include:

History of the Anaconda Smelter NPL Site

To reduce the costs of smelting the copper ore being mined from his Anaconda Mine in Butte, Marcus Daly began scouting for an area to construct a copper smelting facility. The Irish immigrant found the ideal candidate 26 miles west of Butte in Deer Lodge Valley, and, in 1883, purchased the property. Just one year later, the Upper Works began production with a capacity to treat 500 tons of ore daily. Within five years, the Lower Works were constructed one mile east of the Upper Works, raising the daily capacity of treated ores to 3,000 tons. As Daly’s Anaconda Copper Mining (ACM) Company continued to grow, so too did the town of Anaconda. By the early 20th century, the Anaconda-Butte area was the largest copper producer in the world.

Marcus Daly did not live to see the construction of his third smelter, the Washoe Smelter, which had the capacity to process all of the ore being excavated from the Butte mines. As a result, both the Upper and Lower Works were closed and eventually dismantled. Remnants of these operations such as flumes and brick structures can still be seen along the northern ridge of the valley. In 1977, the Anaconda Copper Mining Company was purchased by Atlantic Richfield Company, which would later be acquired by British Petroleum (BP) in 2000. Three years later, in 1980, Atlantic Richfield Company ceased all smelting operations. Demolition of the facilities began in 1982 and continued until 1986.  However, the Washoe Smelter was preserved as a testament of Anaconda’s role in the nation’s mining era. It still stands to this day.

The Anaconda Smelter Site was placed on the Environmental Protection Agency’s (EPA) National Priorities List (NPL) on September 8, 1983. The Anaconda Smelter NPL site encompasses an area of approximately 300 square miles. Due its vastness of size and diversified areas of remedial concern, the site was divided into five of Operable Units, a term used to categorize the numerous activities undertaken as part of a Superfund site cleanup. Additionally, two of these Operable Units were further divided into subareas known as Remedial Design Units (RDU) due to the diverse range of remedial concerns to be addressed within the Anaconda Smelter NPL site.