RI0005D. Iron Ore in the Llano Region, Central Texas, by V. E. Barnes, S. S. Goldich, and F. Romberg. 50 p., 9 figs., 8 plates, 1949. doi.org/10.23867/ri0005D. Downloadable PDF. To purchase this publication in book format, please order RI0005.
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RI0005D. Iron Ore in the Llano Region, Central Texas, by V. E. Barnes, S. S. Goldich, and F. Romberg. 50 p., 9 figs., 8 plates, 1949. ISSN: 2475-367X. doi.org/10.23867/ri0005D. Downloadable PDF.
To purchase this publication in book format, please order RI0005.
The magnetic iron-ore prospects of the Llano region of central Texas were investigated in a program which combined dip-needle and gravity-meter surveys by the Bureau of Economic Geology of The University of Texas and the U.S. Geological Survey with exploration by the U.S. Bureau of Mines. Magnetic observations were made on the Iron Mountain, the Bader, the Gamble, and the Olive mine prospects. Gravity observations were made over the first three areas, which subsequently were drilled. Approximately 65,000 long tons of ore is indicated for the Iron Mountain deposit. The investigations indicate the applicability of combined dip-needle and gravity-meter surveys in search of magnetic iron-ore deposits.
Keywords: iron ore, Llano area, Llano County, Central Texas, mines, magnetic data
Description of prospects
Olive mine prospect
Willow Creek area
Keyser Creek area
Elm Creek area
Martin (Deep) Creek area
Northeastern Gillespie County
North of Llano
Waters Creek area
South of Valley Spring
Riley Mountain area
Summary and conclusions
Logs of diamond-drill holes, Llano and Mason counties, Texas
Table 1. Iron Mountain
Table 2. Bader prospect
Table 3. Gamble prospect
Analyses of samples from diamond-drill holes, Llano County, Texa
Table 4. Iron Mountain
Table 5. Bader prospect
1. Index map showing location of iron-ore prospects in central Texas
2. Geologic map of Iron Mountain and vicinity, Llano County, Texas
3. Sketch showing geology of the 50-foot level, Iron Mountain, Llano County, Texas
4. Cross sections of the Iron Mountain deposit from drilling and mine workings data
5. Index map of the Bader prospect, Llano County, Texas
6. Sketch of U. S. Bureau of Mines trench showing location of samples, Bader prospect,Llano County, Texas
7. Dip-needle observations, Gamble iron-ore prospect, Mason County, Texas
8. Gravitational force, Gamble iron-ore prospect, Mason County, Texas
9. Dip-needle observations, Olive mine prospect, Llano County, Texas
I. Graphic logs of U.S. Bureau of Mines diamond-drill holes, Iron Mountain, Llano County, Texas
II. Map of Iron Mountain magnetite deposit with gravitational force contours
III. Longitudinal section of force over Iron Mountain ore body and longitudinal section of ore body
IV. Diagram of Iron Mountain ore body from drilling data; mass from gravity data for comparison
V. Dip-needle observations, Bader iron-ore prospect, Llano County, Texas
VI. Gravitational force, Bader iron-ore prospect, Llano County, Texas
VII. Gravitational force with regional gradient subtracted, Bader iron-ore prospect, Llano County, Texa
VIII. Graphic logs of U. S. Bureau of Mines diamond-diamond-drill holes, Bader and Gamble iron-ore prospects, Llano and Mason counties, Texas
Barnes, V. E., Goldich, S. S., and Romberg, F., 1949, Iron Ore in the Llano Region, Central Texas: The University of Texas at Austin, Bureau of Economic Geology, Report of Investigations No. 5, 50 p. doi.org/10.23867/ri0005D.