[See History of NURE HSSR Program for a summary of the entire program.]
Totals of 662 sediment and 696 water samples were collected at 700 locations during August of 1977 in the Medfra quadrangle as part of the Los Alamos Scientific Laboratory (LASL) Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) phase. LASL analyzed the samples for uranium and other elements (42 additional elements in sediments and 12 additional elements in waters), and released the data in the GJBX-30(79) report.
The following is a list of sample types collected for the Medfra quadrangle study.
| Sediment Sample Type | Number of Samples | Water Sample Type | Number of Samples |
|---|---|---|---|
| Wet Streams | 230 | Streams | 232 |
| Dry Streams | 1 | Lakes | 464 |
| Wet Lakes | 430 | ||
| Dry Lakes | 1 | ||
| Total Sediments | 662 | Total Waters | 696 |
These Medfra quadrangle samples were analyzed by one or more of the following methods:
Sediment Samples
Water Samples
The data in the NEW-FORMAT NURE data files consist of reformatted records from the GJBX-30(79) report. Any problems found during the reformatting process are noted in the REFORMAT comment field.
Values for dissolved oxygen in 485 samples were added from the GJBX-30(79) report and can be found in the O_DISS field.
The data files are in dBase IV .dbf format. A complete description of the data fields and coding schemes is available online - On-Line Manual for New-Format NURE HSSR Data Files. The data are transferred as gzip .gz compressed files. Simply activate the links below to download the data files. Use gunzip or popular commercial and shareware decompression programs to expand the .gz files. Additional information and executable versions of gzip and gunzip for various systems are available on the gzip home page. If you experience trouble downloading files, try pressing the shift key when clicking (Netscape for Windows), or right-clicking (Internet Explorer for Windows), or pressing the option key when clicking (Netscape and Internet Explorer for Macintosh).
Medfra Quadrangle Sediment Data - medfra_s.dbf.gz
(108 Kb compressed / 1.6 Mb uncompressed)
Medfra Quadrangle Water Data - medfra_w.dbf.gz
(58 Kb compressed / 1.7 Mb uncompressed)
Water samples from this quadrangle are reported to have been acidified with nitric acid but NOT filtered in the field.
Personnel from the Bendix Field Engineering Corporation (BFEC) and the Department of Energy investigated uranium and thorium anomalies that had been detected by aerial gamma-spectrometer surveys of the Medfra quadrangle. The summary report for this investigation was included in the GJBX-222(82) publication compiled by BFEC. The study included areas within Kantishna River, Mount McKinley, Medfra, and Ruby quadrangles where 22 sites were examined and 7 rock samples taken. A total of 11 of these sites were located within the Medfra quadrangle. Radiometric readings were taken at each site with results given for total counts per second, and for eU, eK, and eTh at 9 of the sites. Rock samples were taken from 3 of the sites. These were analyzed by fluorometry for uranium oxide, underwent whole rock chemistry for major element oxides, and underwent closed-can gamma-spectroscopy for eU, eK, and eTh. The results for these analyses can be found only in tables within the published report.
LASL compiled all of the regional HSSR data from Alaskan NURE studies and produced a report [GJBX-32(83)] that graphically displays the distribution of selected elements for most of the State. No additional geochemical data were released with this report.
Gridley, W.A., Anderson, J.R., and Farley, W.G., 1982, Evaluation of radioactivity anomalies in the Sischu Creek Area, central Alaska, in Goodknight, C.S., and Burger, J.A., compilers, Reports on Investigations of Uranium Anomalies: U.S. Department of Energy, Bendix Field Engineering Corporation, Grand Junction, Colo., GJBX-222(82), p. 17-28.
Van Eeckhout, E.M., Warren, R.G., and Hill, D.E., 1979, Uranium hydrogeochemical and stream sediment reconnaissance of the Medfra and Mt. McKinley NTMS quadrangles, Alaska, including concentrations of forty-three additional elements: Los Alamos Scientific Laboratory informal report LA-7351-MS, Los Alamos, N.M., U.S. Department of Energy, Grand Junction, Colo., GJBX-30(79), 210 p.
Weaver, T.A., Freeman, S.H., Broxton, D.E., Bolivar, S.L., and others, 1983, The geochemical atlas of Alaska: Los Alamos National Laboratory, Los Alamos, N.M., LA-9897-MS, U.S. Department of Energy, Grand Junction, Colo., GJBX-32(83), 57 p.
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