Wiltse, M.A. Reger, R.D. Newberry, R.J. Pessel, G.H. Pinney, D.S. Robinson, M.S. Solie, D.N. 1995 vector digital data Report of Investigation RI 95-2A Fairbanks Alaska Division of Geological & Geophysical Surveys 1 sheet, scale 1:63,360 http://www.dggs.alaska.gov/pubs/pubs?reqtype=citation&ID=2514 This report provides detailed (1:63,360-scale) mapping of portions of U.S. Geological Survey Circle B-2 (1955), B-3 (1955), B-4 (1952), C-2 (1955), C-3 (1955), and C-4 (1952) quadrangles. The area is part of the Circle mining district and adjacent to the Fairbanks mining district. This report includes detailed geologic, structural, stratigraphic, and geochronologic data. Based on the resulting geologic maps, field investigations, and laboratory materials analyses, the project has also generated derivative maps of geologic construction materials and geologic hazards. The investigation of gold, and other mineral occurrences in conjunction with comprehensive geologic mapping and recently acquired geophysical data will provide a scientific basis for continued mineral exploitation that will economically benefit the region's inhabitants and the State of Alaska. The 9 layers listed below are present as ArcGIS shape files. Attribute information for the following layers (entities) is included in this metadata file under the "Entity_and_Attribute_Information" section. Each layer is listed and described in detail under its own heading starting "Entity_Type_Label." Basic unit information is also included in the unit code set file "RI1995-2A_codeset.pdf." Layers include: >realcirgeo94_polygon geologic units >realtstunion2_polygon Alternate view of the geologic units. Note that the bedrock polygons in this layer intersect the surficial unit polygons in locations where the units overlap. Users can use attribute values in this layer to selectivly trigger display of bedrock or surficial units. See the the attribute domain value definition of this layer for further explanation. >realallsam_point sample locations for 1993 and 1994 field season >realbedcon94_arc coded line surrounding bedrock units >realcirstrat_point locations of stratigraphic sections measured in the field >realfault94_arc coded lines describing faults >realshear_arc coded line describing shears zones >realsheargry_arc coded line describing sheas zones covered by surficial deposits >cirstrike_point coded point locations of strike and dip measurements 1994 1995 ground condition Complete None planned -145.727087 -144.478452 65.615074 65.368219 ISO 19115 Topic Category geoscientificInformation None Aereal Aerial Photography Aeromagnetic Survey Age Dates Alluvial Deposits Alluvium Amphibolite Ar-Ar Bedrock Bibliography C14 Carbonates Clastics Coal Colluvial Deposits Colluvium Conductivity Survey Conodonts Electromagnetic Survey Fan Faulting Faults Fluvial Folding Fossils Geologic Geomorphology Glacial Glacial Deposits Glacial Drift Granite Hornfels Hornblende Igneous Rocks K-Ar Magnetite Major Oxides Metamorphic Grade Metamorphic Minerals Metamorphism Mineralogy Modal Analysis Petrography Plutonic Plutonic Hosted Porphyry Precious Metals Quartz Regional Regional Metamorphism Sample Location Sandstone Schist Sedimentary Structure Surficial Tectonics Terranes None Alaska, State of Birch Creek Circle Hot Springs Circle Mining District Circle Quadrangle Crooked Creek Mammoth Creek Mastodon Dome None Tintina Fault Yukon-Tanana Terrane Yukon-Tanana Upland None Cretaceous Holocene Paleozoic Pleistocene Quaternary Tertiary This report, map, and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below). 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. 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. State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys GIS Data Manager/Cartographer mailing and physical

3354 College Road

Fairbanks AK 99709-3707 USA (907) 451-5029 (907) 451-5020 (907) 451-5050 dggspubs@alaska.gov You may view our web site at http://www.dggs.alaska.gov for the latest information on available data.Please e-mail your questions and data requests when possible since our web site and e-mail address will remain current even if our phone number and mailing address change. This map has been compiled and drawn under contract between the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, and WGM, Mining and Geological Consultants, Inc. Airborne geophysical data for the area was acquired by Dighem Surveys & Processing, Inc. in 1993. ArcInfo version 7x converted to ArcGis 9x Wiltse, M.A. Reger, R.D. Newberry, R.J. Pessel, G.H. Pinney, D.S. Robinson, M.S. Solie, D.N. 1993 map Public Data File PDF 93-86 Fairbanks, Alaska Alaska Division of Geological & Geophysical Surveys 1 sheet, scale 1:63,360 http://www.dggs.alaska.gov/pubs/pubs?reqtype=citation&ID=1625 Geologic data were digitized from a mylar geologic compilation.This compilation was done on a one to one scale, stable mylar of the USGS topographic base for each of the 1:63,360 scale USGS topographic bases included in the map area.Geologic data included in the compilation are the field maps and notes from this project. Surficial geological information was interpreted from false color infrared aerial photography and transferred to the basemap using a zoom transfer scope. The resulting compilation was then digitized with an average RMS error of .003 or less. The geologic interpretations presented in this report have undergone two technical reviews by geologists familiar with the subject of the report or geology of the map area. Reviewers' suggestions were incorporated into the final draft when deemed appropriate by the author. The logical consistency of the polygon, point and line files has been visually checked but not systematically verified. Some topology errors are known to exist in the polygon files. This dataset includes geospatial information about geologic units, sample locations for radiometric age dates, structural features and structural measurements. Many of the lithologic and anaylitical samples collected for this project are housed at the Alaska Geologic Materials Center (GMC). Location data were determined visually using topographic maps at scales of 1:63,360 and larger. Altimeters were also used. GPS technology was not used to determine locations. Instead, geologic contacts, sample, and station locations were visually hand-plotted onto stable mylar bases from the field maps. The coordinates of sample and station locations were determined with a digitizing tablet. All samples plotted on the maps are included in the various tables. 100 The estimated horizontal error of this dataset is +/- 100 meters. Considering the errors inherent in the USGS topographic maps, locating oneself in the field, and the digitizing method, all localities, stations, and samples are located to an accuracy of between 10 and 100 meters. The geologic data included in this project were digitized from a mylar compilation of geologic field maps produced on USGS topo bases of the area. Map unit (polygon) locations and attributes were checked by two reviewers broadly familiar with the dominant geologic rock types in the Fairbanks area. Locations were determined visually using topographic maps at scales of 1:63,360 and 1:25,000.Geologic contacts, sample, and station locations were visually hand-plotted onto stable mylar bases from the field maps. 1995 This project was included in a legacy data rescue effort. The metadata and distribution files were compiled long after project completion. The original ARC coverages for this dataset were damaged and subsequently reconstructed by the GIS manager. Lineage information and attribute value information not documented in this file is unavailable. 2008 The layer 'realtstunion2_polygon' was added to the metadata and distribution dataset. 2010 Vector Universal Transverse Mercator 6 0.999600 -147.000000 0 500000.0 0 coordinate pair 0.000001 0.000001 meters realcirgeo94_polygon Universal Transverse Mercator 6 0.999600 -147.000000 0 500000.0 0 coordinate pair 0.000001 0.000001 meters realtstunion2_polygon Universal Transverse Mercator 6 0.999600 -147.00000 0 500000.0 0 coordinate pair 0.000001 0.000001 meters realallsam_point Universal Transverse Mercator 6 0.999600 -147.00000 0 500000.0 0 coordinate pair 0.000001 0.000001 meters realbedcon94_arc Universal Transverse Mercator 6 0.999600 -147.00000 0 500000.0 0 coordinate pair 0.000001 0.000001 meters realcirstrat_point Universal Transverse Mercator 6 0.999600 -147.00000 0 500000.0 0 coordinate pair 0.000001 0.000001 meters realfault94_arc Universal Transverse Mercator 6 0.999600 -147.00000 0 500000.0 0 coordinate pair 0.000001 0.000001 meters realshear_arc Universal Transverse Mercator 6 0.9996 -147.00000 0 500000.0 0 coordinate pair 0.000001 0.000001 meters realsheargry_arc Universal Transverse Mercator 6 0.9996 -147.00000 0 500000.0 0 coordinate pair 0.000001 0.000001 meters cirstrike_point Clarke_1866_UTM_Zone_6N Clarke 1866 6378206.4 294.9786982 realallsam_point realallsam_point.shp Object type is point, there are 457 rows associated with this entity, and the entity values refer to sample locations for whole rock major oxide and age dating analysis. Alaska Division of Geological & Geophysical Surveys Code Unique number assigned to samples taken during project Alaska Division of Geological & Geophysical Surveys 1 Majjor oxide sample Alaska Division of Geological & Geophysical Surveys 2 Geochemical sample Alaska Division of Geological & Geophysical Surveys 3 Major oxide and geochemical sample Alaska Division of Geological & Geophysical Surveys realcirgeo94_poly realcirgeo94_poly.shp Object type is vector, there are 1101 rows associated with this entity, and the entity values refer to the unit name abbreviations for each specific polygon represented on the map. Alaska Division of Geological & Geophysical Surveys Hfls Polygon contains hornfels or not Alaska Division of Geological & Geophysical Surveys Yes Polygon contains hornfels Alaska Division of Geological & Geophysical Surveys No Polygon does not contain hornfels Alaska Division of Geological & Geophysical Surveys Altgran Polygon contains alteration pattern Alaska Division of Geological & Geophysical Surveys Yes Polygon contains alteration pattern Alaska Division of Geological & Geophysical Surveys No Polygon does not contain alteration pattern Alaska Division of Geological & Geophysical Surveys Srfbed Refers to whether or not bedrock polygon is covered by overlying surficial deposits Alaska Division of Geological & Geophysical Surveys S Concealed bedrock Alaska Division of Geological & Geophysical Surveys B Exposed bedrock Alaska Division of Geological & Geophysical Surveys U Unmapped Alaska Division of Geological & Geophysical Surveys unit A unique three to four letter abbreviation given to each map unit represented on the map. Alaska Division of Geological & Geophysical Surveys RI1995-2A_codeset.pdf Alaska Division of Geological & Geophysical Surveys http://www.dggs.alaska.gov/metadata/RI1995-2A_codeset.pdf realbedcon94_arc realbedcon94_arc.shp Object type is vector, there are 1012 rows associated with this entity, and the entity values refer to type of bedrock contact Alaska Division of Geological & Geophysical Surveys Code Describes type of line representing bedrock contact Alaska Division of Geological & Geophysical Surveys Srfbed Refers to whether or not line segment is covered by overlying surficial deposits Alaska Division of Geological & Geophysical Surveys s Concealed fault Alaska Division of Geological & Geophysical Surveys b Exposed fault Alaska Division of Geological & Geophysical Surveys u In unmapped area Alaska Division of Geological & Geophysical Surveys realcirstrat_point realcirstrat_point.shp Object type is point and there are 7 rows associated eith this entity, the entity values refere to symbols for location point where stratigraphic sections where taken in the field Alaska Division of Geological & Geophysical Surveys Label Stratigraphic section label in alphapthical order stating with letter A Alaska Division of Geological & Geophysical Surveys Location of a geologic measurement: A= first measurement in this dataset, others in alphabethical order. Strat Stratigraphic section label, renamed label Alaska Division of Geological & Geophysical Surveys Location of a geologic measurement: A= first measurement in this dataset, others in alphabethical order. realfault94_arc realfault94_arc.shp Object type is vector, there are 1207 rows associated with thei entity, and the entity values refere to fault locations, traces and types Alaska Division of Geological & Geophysical Surveys Code Referes to the type of fault mapped Alaska Division of Geological & Geophysical Surveys 5 Low-angle fault-sawteeth on upper plate-inferred Alaska Division of Geological & Geophysical Surveys 6 Low-angle fault-sawteeth on upper plate-queried, uncertain Alaska Division of Geological & Geophysical Surveys 8 Antiform-inferred or concealed Alaska Division of Geological & Geophysical Surveys 9 Antiform-uncertain, queried Alaska Division of Geological & Geophysical Surveys 10 High-angle fault-certain Alaska Division of Geological & Geophysical Surveys 11 High-angle fault-inferred Alaska Division of Geological & Geophysical Surveys 12 High-angle fault-inferred and concealed Alaska Division of Geological & Geophysical Surveys 14 Thrust fault-inferred and concealed Alaska Division of Geological & Geophysical Surveys 15 Thrust fault-inferred, queried Alaska Division of Geological & Geophysical Surveys realshear_arc realshear_arc.shp Object type is vector, there are 9 rows associated with this entity, and the entity values refer to exposed portion of shear zones Alaska Division of Geological & Geophysical Surveys Code Indicates line type for shear zones Alaska Division of Geological & Geophysical Surveys 16 Shear zone Alaska Division of Geological & Geophysical Surveys realsheargry_arc realsheargry_arc.shp The object type is vectoe, and there are 24 rows associated with this entity, and entity values refer to shear zones covered by surficial deposits Alaska Division of Geological & Geophysical Surveys Code Line type for shear zone Alaska Division of Geological & Geophysical Surveys 0 Invisible line Alaska Division of Geological & Geophysical Surveys 16 Shear zone Alaska Division of Geological & Geophysical Surveys cirstrike_point cirstrike_point.shp Object type is point, there are 362 rows associated with this entity, and the entity values refer to symbols for strike and dip information. Alaska Division of Geological & Geophysical Surveys Symbol Represents cortographic symbol on map Alaska Division of Geological & Geophysical Surveys 5 Strike and dip of dominant foliation Alaska Division of Geological & Geophysical Surveys 32 Apparent strike and dip of dominant foliation Alaska Division of Geological & Geophysical Surveys 33 Bearing and plunge of lineation Alaska Division of Geological & Geophysical Surveys Marker Represents cartographic symbol on map, same as Symbol Alaska Division of Geological & Geophysical Surveys 5 Strike and dip of dominant foliation Alaska Division of Geological & Geophysical Surveys 32 Apparent strike and dip of dominant foliation Alaska Division of Geological & Geophysical Surveys 33 Bearing and plunge of lineation Alaska Division of Geological & Geophysical Surveys Dip Represents the dip angle used to produce the dip direction Alaska Division of Geological & Geophysical Surveys 0 90 degrees Angle Describes the direction of strike, used to rotate symbols on map Alaska Division of Geological & Geophysical Surveys 0 360 realtstunion2_polygon realtstunion2_polygon.shp Alternate view of the geologic units. Note that thesurficialpolygons in this layer intersect the bedrock unit polygons in locations where the units overlap. Users can use attribute values in this layer to selectivly trigger display of bedrock or surficial units.The attribute column 'BUNIT' identifies the interpreted underlying bedrock lithology and extent. Alaska Division of Geological & Geophysical Surveys SUNIT surficial units Alaska Division of Geological & Geophysical Surveys RI1995-2A_codeset.pdf Alaska Division of Geological & Geophysical Surveys http://www.dggs.alaska.gov/metadata/RI1995-2A_codeset.pdf NULL The records appear to correspond the outer boundaries of the unmapped areas of the printed map. These values were likely created for cartographic reasons and do not form complete polygons. Alaska Division of Geological & Geophysical Surveys unmapped unmapped areas Alaska Division of Geological &Geophysical Surveys BUNIT bedrock units Alaska Division of Geological & Geophysical Surveys NULL The records appear to correspond the outer boundaries of the unmapped areas of the printed map. These values were likely created for cartographic reasons and do not form complete polygons. Alaska Division of Geological & Geophysical Surveys RI1995-2A_codeset.pdf Alaska Division of Geological & Geophysical Surveys http://www.dggs.alaska.gov/metadata/RI1995-2A_codeset.pdf Unknown areas in which the bedrock lithology was not mapped Alaska Division of Geological & Geophysical Surveys ALT Polygon contains alteration pattern Alaska Division of Geological & Geophysical Surveys NULL The records appear to correspond the outer boundaries of the unmapped areas of the printed map. These values were likely created for cartographic reasons and do not form complete polygons or the polygon does not contain an alteration pattern Alaska Division of Geological &Geophysical Surveys no The polygon does not contain an alteration pattern Alaska Division of Geological & Geophysical Surveys yes The polygon does contain an alteration pattern Alaska Division of Geological & Geophysical Surveys HFLS Polygon contains hornfels or not Alaska Division of Geological & Geophysical Surveys yes Polygon contains hornfels Alaska Division of Geological & Geophysical Surveys no Polygon does not contain hornfels Alaska Division of Geological & Geophysical Surveys NULL The records appear to correspond the outer boundaries of the unmapped areas of the printed map. These values were likely created for cartographic reasons and do not form complete polygons or the polygon does not contain a hornfels pattern Alaska Division of Geological &Geophysical Surveys State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys mailing and physical

3354 College Road

Fairbanks AK 99709-3707 USA 907-451-5020 907-451-5050 dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays Please view our web site (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services 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, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product. Current publication is available on paper. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. http://www.dggs.alaska.gov/pubs/pubs?reqtype=citation&ID=2514 SHP No compression applied http://www.dggs.alaska.gov/pubs/pubs?reqtype=citation&ID=2514 Free download PDF No compression applied http://www.dggs.alaska.gov/pubs/pubs?reqtype=citation&ID=2514 Free download DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media over the counter by mail, phone, fax, or email from the DGGS Fairbanks office.Turn around time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for a exact shipping ammount. 20101004 Metadata manager mailing and physical

State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys

Fairbanks AK 99709-3707 USA 907-451-5020 FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 If the user has modified this metadata file in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent this metadata file, 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.