fada57ee-be5d-4de7-8f4a-cda624f6d9fb_source eng; USA utf8 dataset Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 3354 College Road Fairbanks AK 99709-3707 USA pointOfContact 2016-11-04 ISO 19115 Geographic Information - Metadata ISO 19115:2003/Cor.1:2006(E) Trace-element geochemical data from stream sediments collected in the Tok River area, Tanacross A-5 and A-6 quadrangles, Alaska in 2016 2016-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Naibert, T.J. originator Werdon, M.B. originator Lande, Lauren originator Wypych, Alicja originator http://dx.doi.org/10.14509/29688 REPORT AND DIGITAL DATA Raw Data File RDF 2016-10 3 p. In 2016, geologists from the Alaska Division of Geological & Geophysical Surveys (DGGS) and University of Alaska Fairbanks carried out a two-part geologic mapping and geochemical sampling project in the Tok River area of the Tanacross A-5 and A-6 quadrangles (June 12-26 and July 8-26). This report provides results of stream-sediment sampling for trace-element geochemistry. An initial suite of sediment samples was collected from streams draining known gold occurrences, including the Stibnite Creek and Noah prospects, and numerous prospects in the White Gold area. These samples were split in half and the two splits were sieved to -200 mesh and -80 mesh, respectively. The splits were then both analyzed to determine which size fraction was best for identifying gold anomalies in this part of the Alaska Range. In most samples, the -200 mesh fraction showed higher gold levels, and hence, all additional samples we collected were analyzed at -200 mesh. In some -80 mesh samples, gold and tungsten appear to show "nugget" effects not seen in the -200 mesh samples. The other trace elements are largely equivalent between the two mesh sizes. The second suite of samples was collected throughout the map area from streams draining color anomalies, from areas where DGGS mapping identified igneous rocks upstream, and from areas with suspected potential for base-metal or gold mineralization. Highlights of the analytical results include two samples draining the Noah prospect with greater than 1 part per million gold. The analytical data tables associated with this report are available in digital format as comma-separated value (CSV) files. The combination of insufficient detailed geologic mapping, historical and current industry interest in the adjacent mineralized areas, and the recently published geophysical data prompted the DGGS Mineral Resources section to conduct a stream-sediment sampling program in conjunction with geologic mapping in the Tok River area. The DGGS Tok River project is funded through U.S. Geological Survey STATEMAP Award No. G16AC00182; Cooperative Agreement Number G16AC00167 between the U.S. Geological Survey and the Alaska Department of Natural Resources, Division of Geological & Geophysical Surveys; and by State of Alaska general funds. completed Alaska Division of Geological & Geophysical Surveys GIS Manager 907-451-5020 3354 College Rd Fairbanks AK 99709-3707 USA dggsgis@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays pointOfContact notPlanned Analyses Analyses and Sampling Analytical Lab Results Analytical Results Chemistry Economic Geology Exploration Geochemical Data Geochemical Surveys Geochemistry Geology Gold Heavy Metals Lab Methods Metals Mineral Assessment Mineral Deposit Mineral Localities Mineral Prospect Mineral Resources Placer Placer Gold Precious Metals STATEMAP Project Stream Sediments Trace Elements Trace Geochemical Trace Metals theme Alaska Division of Geological & Geophysical Surveys Dall Prospect Eagle Prospect Jacqueline Prospect Shalosky Prospect Tanacross Quadrangle Tok Tok Mining District Tok River place Alaska Division of Geological & Geophysical Surveys Delta Mineral Belt stratum Alaska Division of Geological & Geophysical Surveys The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product. otherRestrictions Use Constraints: Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product. otherRestrictions Access Constraints: This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below). Tok electromagnetic and magnetic airborne geophysical survey data compilation 2015-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Emond, A.M. originator CGG originator Burns, L.E. originator Graham, G.R.C. originator CGG Land (US) Inc. originator http://doi.org/10.14509/29347 Geophysical Report GPR 2015-2 crossReference Preliminary report on mineral occurrences in the Tok River area, Alaska 2016-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Twelker, Evan originator Freeman, L.K. originator Sicard, K.R. originator Busk, A.C. originator http://doi.org/10.14509/29605 Preliminary Interpretive Report PIR 2016-2 7 p crossReference Major-oxide and trace-element geochemical data from rocks collected in 2015 in the Tok area, Tanacross A-5, A-6, and parts of adjacent quadrangles, Alaska 2015-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Wypych, Alicja originator Sicard, K.R. originator Twelker, Evan originator Freeman, L.K. originator Lande, Lauren originator Reioux, D.A. originator http://doi.org/10.14509/29517 Raw Data File RDF 2015-15 3 p crossReference Major-oxide and trace-element geochemical data from rocks collected in the Tok River area, Tanacross A-5 and A-6 quadrangles, Alaska in 2016 2016-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Wypych, Alicja originator Sicard, K.R. originator Gillis, R.J. originator Lande, L.L. originator Naibert, T.J. originator Newberry, R.J. originator Twelker, Evan originator Werdon, M.B. originator Willingham, A.L. originator http://doi.org/10.14509/29685 Raw Data File RDF 2016-9 3 p crossReference vector eng; USA geoscientificInformation -144.019833 -143.096187 63.027626 63.245385 2016-01-01 >border: Outline of the study area >stream-sed-trace-element: Trace-element analysis of stream-sediment samples true ASCII tabular files unknown Alaska Division of Geological & Geophysical Surveys (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays Please view our website (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. distributor Contact DGGS for current pricing Free download http://dx.doi.org/10.14509/29688 ASCII tabular files CSDGM IMPORT ERROR: No digtinfo/formcont information dataset Horizontal Positional Accuracy Report Locations were recorded using handheld, WAAS-enabled GPS devices. WAAS-enabled GPS devices have a reported error of about 1 m (NSTB/WAAS T&E Team, 2006). Depending on degradation of the WAAS and GPS signals, the horizontal position error of sample locations in this report is in the range of 1-10 m. This data release is complete. The data tables have been lightly edited for clarity, but are generally provided as received from the lab. This data release is complete. The data tables have been lightly edited for clarity, but are generally provided as received from the lab. not applicable This lineage was generated by the FGDC CSDGM to 19139 transformation Sample selection - Stream-sediment sample locations were selected to characterize drainage basins containing igneous intrusions or locations of known or potential mineralization. In the field, sample locations were selected that were upstream of alluvial fans and as close to stream confluences as possible, while also accounting for availability of sample material and proximity to helicopter landing zones. Specific sites at the sample location were selected based on the presence of fine-grained sand and silt, and included eddies or plunge-pools behind boulders or logs, eddies along edges of streams, overbank deposits, and channel bars. Samples were collected with a shovel, screened by hand using a Garrett's Combination Sifter with a 0.483-inch square-hole mesh, and then further screened using a 0.0742-inch square-hole mesh (-10 mesh). Undersized material was collected in a 3-gallon plastic bucket and then all materials, fines, and water were poured into polypropylene sample bags (10 inch x 17 inch) specifically designed to capture fines and allow water drainage. Where possible, the sample bags were filled to capacity to provide enough sample material to split and sieve using both -80 mesh and -200 mesh screens. For the remaining samples, sample bags were filled to approximately 60 percent of capacity. Individual sample weights were measured after drying and are provided in the analytical results. 2016-01-01T00:00:00 Sample preparation - Sediment samples were processed by ALS Minerals using their PREP-41 package. The samples were logged and dried at a maximum temperature of 60 degrees Celsius. An initial batch of 23 samples were each split with a riffle splitter, and sample splits were dry-sieved to less than 180 microns (-80 mesh) and to less than 75 microns (-200 mesh), respectively. The remaining 44 samples were dry-sieved to less than 75 microns (-200 mesh). 2016-01-01T00:00:00 Major- and trace-element compositions - Trace-element compositions for sediment samples were determined by ALS Geochemistry method ME-MS61: Four-acid digestion followed by inductively coupled plasma-atomic emission spectrometry (ICP-AES) and inductively coupled plasma-mass spectroscopy (ICP-MS). Platinum, palladium, and gold values were analyzed by 30 g fire assay with ICP-MS finish (ALS Geochemistry method PGM-MS23). Samples that exceeded detection limits for gold were reanalyzed by 30 g fire assay with atomic absorption (AA) finish (ALS Geochemistry method Au-AA25). 2016-01-01T00:00:00 Sample archival - Samples collected during this project, as well as laboratory sample rejects and pulps, will be stored at DGGS for the duration of the project and will be available for public viewing upon request. Once the project concludes, the samples and pulps will be stored at the Alaska Geologic Materials Center in Anchorage. 2016-01-01T00:00:00 Source Contribution: sample selectionSource Type: paper 63360 Bedrock geologic map of the Delta mineral belt, Tok mining district, Alaska 2003-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Dashevsky, S.S. originator Schaefer, C.F. originator Hunter, E.N. originator http://doi.org/10.14509/2923 Professional Report PR 122 122 p., 2 sheets, scale 1:63,360 2003-01-01 Source Contribution: sample selectionSource Type: paper 250000 Reconnaissance geologic map of the Tanacross Quadrangle, Alaska 1970-01-01 publication U.S. Geological Survey United States publisher Foster, H.L. originator http://dggs.alaska.gov/pubs/id/12871 Miscellaneous Geologic Investigations Map I 593 1 sheet, scale 1:250,000 1970-01-01 Source Contribution: sample selectionSource Type: paper 63360 Geologic maps of the eastern Alaska Range, Alaska (44 quadrangles, 1:63,360 scale), with descriptions and interpretations of map units 2015-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Nokleberg, W.J. originator Aleinikoff, J.N. originator Bond, G.C. originator Ferrians, O.J., Jr. originator Herzon, P.L. originator Lange, I.M. originator Miyaoka, R.T. originator Richter, D.H. originator Schwab, C.E. originator Silva, S.R. originator Smith, T.E. originator Zehner, R.E. originator http://doi.org/10.14509/29444 Report of Investigation RI 2015-6 64 p., 45 sheets, scale 1:63,360 2015-01-01 otherRestrictions Metadata Use Constraints: If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys. unknown This metadata was automatically generated from the FGDC Content Standard for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2019-08-12T11:11:00 version of the FGDC CSDGM to ISO 19139 transform. Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 3354 College Road Fairbanks AK 99709-3707 USA pointOfContact