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- Boulder Batholith (3)
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Articles 1 - 7 of 7
Full-Text Articles in Geological Engineering
Geology Of An Area Near Montana City, Montana, Frank A. Crowley
Geology Of An Area Near Montana City, Montana, Frank A. Crowley
Bachelors Theses and Reports, 1928 - 1970
The investigated area lies about five miles south of Helena, Montana, near the abandoned gold camp of Montana City. Topographically, the area reflects the sedimentary formations and the igneous rocks, quartz monzonite and rhyolite. Static recrystallization of the sedimentary rocks caused by the intrusion of the Boulder Batholith, along with deformation of sedimentary beds by pre-batholithic folding and by post-batholithic faulting have complicated the geologic picture.
The Placer Deposits Of The Siberia District (German Gulch), Montana, Ronald D. Karvinen
The Placer Deposits Of The Siberia District (German Gulch), Montana, Ronald D. Karvinen
Bachelors Theses and Reports, 1928 - 1970
The original concept of this problem was to determine if hidden or buried placers existed past the terminal point of the extensive placering in the Siberia District. Several theories have been advanced for the sudden cessation of those placers. All are plausible, and are both for and against an extended placer. The past history relates that some $13,000,000 in gold has been produced in the area, therefore stressing a practical search for additional accumulation.
Fluorite On The Wrong Font Claim, Robert L. Clayton
Fluorite On The Wrong Font Claim, Robert L. Clayton
Bachelors Theses and Reports, 1928 - 1970
The Wrong Front claim lies west of Butte near Nissler Junction. It is owned by Thomas J. Helehan of Butte. The deposit is epithermal and lies within the Boulder Batholith. The host rocks are granite, alaskite and andesite with granite being the most prominent host rock.
Geology Of A Mineralized Breccia "Pipe" Near Basin, Montana, James W. Allan
Geology Of A Mineralized Breccia "Pipe" Near Basin, Montana, James W. Allan
Bachelors Theses and Reports, 1928 - 1970
Located on the western flank of the Boulder batholith of southwestern Montana, the mineralized breccia "pipe" is opened by the Obelisk Mine. The intersection of two fault systems in the quartz monzonite of the Boulder batholith has provided the locus of the breccia "pipe". There is fairly conclusive evidence indicating that the present outcrop of the "pipe" lies only a few hundred feet below the former "roof" of the batholith.
Southwestern Extension Of The Pondera Field, Paul P. Garding
Southwestern Extension Of The Pondera Field, Paul P. Garding
Bachelors Theses and Reports, 1928 - 1970
Oil was discovered in the Pondera field in June 1927 following work done by E.B. Emrick. The initial discovery well, located in section 17, T. 27 N., R. 4 W., was not a commercial oil producer. Its initial production being 3 barrels of oil and 3,500,000 cubic feet of gas per day. Rapid expansion followed until 1929, when the field reached its peak of production.
Tungsten Mineralization At The Strawberry Mine, Pony, Montana, Robert L. Meyer
Tungsten Mineralization At The Strawberry Mine, Pony, Montana, Robert L. Meyer
Bachelors Theses and Reports, 1928 - 1970
The Strawberry Mine, located four miles west of Pony, Montana, for many years an intermittent producer of gold are, is once again the scene of mining activity due to the discovery of scheelite in 1953.
New Techniques For Ore Search, Paul L. Allsman
New Techniques For Ore Search, Paul L. Allsman
Bachelors Theses and Reports, 1928 - 1970
This report is a survey of the newest methods in use for mineral exploration. It will attempt to review the newest techniques in the fields of geophysics, geologic research and theories of ore deposits, exploratory drilling, mapping methods and other tools of mineral exploration. Then a preview of coming and predicted techniques will comprise a summary.