Geology of the Basin Quadrangle, Montana

Ruppel, E.T.

doi:10.3133/ofr5887

Cited by 10 publications

(20 citation statements)

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“…The Boulder Basin mining district is located in the Northeast part of the Cretaceous Boulder Batholith. Geologic mapping in the area has been done by Becraft andothers, 1963, andRuppel, 1963. A more recent summary of the geologic setting is given by O'Neill and others 2000The majority of the batholith is a muti-textured granitoid which include different plutons.…”

Section: Figure 1 Index Map For the Study Area And Lewis And Clark Comentioning

confidence: 99%

Schlumberger DC resistivity soundings in the Boulder Watershed, Jefferson and Lewis and Clark counties, Montana

Smith¹,

Sole²

2000

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Section: Figure 1 Index Map For the Study Area And Lewis And Clark Comentioning

confidence: 99%

Schlumberger DC resistivity soundings in the Boulder Watershed, Jefferson and Lewis and Clark counties, Montana

Smith¹,

Sole²

2000

Open-File Report

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“…The mined ore contained abundant disseminated and massive pyrite, locally abundant arsenopyrite, sparse chalcopyrite, and sparse local galena and sphalerite. The 1.6 meter thick, sub-vertical Buckeye ore vein was worked through shafts of 30 to 60 meter depths, and similar veins at the Enterprise were worked through a 122 meter vertical shaft (Ruppel, 1963). A mill was built during World War II to re-process the gravity tailings using flotation technology.…”

Section: Historical Backgroundmentioning

confidence: 99%

“…The main mineralized Buckeye vein and smaller adjacent veins occur in fault zones cutting the Butte pluton and the late-stage felsic pluton (Ruppel, 1963).…”

Section: Geologic and Geohydrologic Settingmentioning

confidence: 99%

Ground geophysical study of the Buckeye mine tailings, Boulder watershed, Montana

McDougal¹,

Smith²

2000

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The Buckeye mine site is located in the Boulder River watershed along Basin Creek, in northern Jefferson County, Montana. This project is part of the Boulder River watershed Abandoned Mine Lands Initiative, and is a collaborative effort between the U.S. Geological Survey and Bureau of Land Management in the U.S. Department of the Interior, and the U.S. Forest Service in the U.S. Department of Agriculture. The site includes a large flotation milltailing deposit, which extends to the stream and meadows below the mine. These tailings contain elevated levels of metals, such as silver, cadmium, copper, lead, and zinc. Metal-rich fluvial tailings containing these metals, are possible sources of ground and surface water contamination. Geophysical methods were used to characterize the sediments at the Buckeye mine site. Ground geophysical surveys, including electromagnetics, DC resistivity, and total field magnetic methods, were used to delineate anomalies that probably correlate with subsurface metal contamination. Subsurface conductivity was mapped using EM-31 and EM-34 terrain conductivity measuring systems. The conductivity maps represent variation of concentration of dissolved solids in the subsurface from a few meters, to an approximate depth of 30 meters. Conductive sulfides several centimeters thick were encountered in a shallow trench, dug in an area of very high conductivity, at a depth of approximately 1 to1.5 meters. Laboratory measurements of samples of the sulfide layers show the conductivity is on the order of 1000 millisiemens. DC resistivity soundings were used to quantify subsurface conductivity variations and to estimate the depth to bedrock. Total field magnetic measurements were used to identify magnetic metals in the subsurface. The EM surveys identified several areas of relatively high conductivity and detected a conductive plume extending to the southwest, toward the stream. This plume correlates well with the potentiometric surface and direction of ground water flow, and with water quality data from monitoring wells in and around the tailings. The electrical geophysical data suggests there has been vertical migration of high dissolved solids. A DC sounding made on a nearby granite outcrop to the north of the mine showed that the shallow conductivity is on the order of 5 millisiemens/m. Granite underlying the mine tailings, with similar electrical properties as the outcropping area, may be more than 30 meters deep.2

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“…The geology of the Cataract Creek drainage has been described in detail by Ruppel (1963) and Becraft and others (1963). The dominant geologic features in the study area are the Boulder Batholith and the overlying Elkhorn Mountain Volcanics.…”

Section: Description Of the Study Areamentioning

confidence: 99%

Quantification of metal loads by tracer-injection and synoptic-sampling methods in Cataract Creek, Jefferson County, Montana, August 1997

Cleasby¹,

Nimick²,

Kimball³

2000

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Geology of the Basin Quadrangle, Montana

Cited by 10 publications

References 0 publications

Schlumberger DC resistivity soundings in the Boulder Watershed, Jefferson and Lewis and Clark counties, Montana

Schlumberger DC resistivity soundings in the Boulder Watershed, Jefferson and Lewis and Clark counties, Montana

Ground geophysical study of the Buckeye mine tailings, Boulder watershed, Montana

Quantification of metal loads by tracer-injection and synoptic-sampling methods in Cataract Creek, Jefferson County, Montana, August 1997

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