Surficial geologic map of the Circle mining district, Alaska

Surficial geologic map of the Circle mining district, Alaska, Report of Investigation 95-2C, presents results from a geologic investigation of surficial deposits in parts of the Circle B-1, B-2, B-3, B-4, C-2, C-3, and C-4 quadrangles. The surficial deposits of the Circle mining district have long been sources of placer gold and even alluvial diamonds. Throughout most of the map area, the bedrock surface is blanketed by periglacial slope deposits consisting of silty rubble with angular and subangular clasts of local bedrock. This unconsolidated unsorted material was produced by intense frost shattering of bedrock and was spread downslope by mass movement processes. These processes are still active in the area today. In valley bottoms, terrace and floodplain alluvium consist of coarse, angular to subangular gravels. In upland valleys, the locally auriferous are commonly mixed with slope debris. Radiocarbon dating of organic sediments ranges in age from mid-Wisconsonian to Holocene. Although frost is discontinuous, sentiments in the valley are generally frozen and locally contain bones of large extinct vertebrae. Although landforms have been extensively modified by erosion, frost action, and mass movement, recognizable glacially modified valleys, silty gravel, and till provide evidence of at least one former glaciation. Glaciation of North Harrison Creek probably had a significant effect on the distribution of nuggets there. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/2516.

Data e Risorse

Campo Valore
access_constraints ["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.", "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)."]
bbox-east-long -144.481277
bbox-north-lat 65.585832
bbox-south-lat 65.368219
bbox-west-long -145.721623
contact-email dggspubs@alaska.gov
coupled-resource []
dataset-reference-date [{"type": "publication", "value": "1995-01-01"}]
frequency-of-update notPlanned
guid c1f69f8e-c0f6-4a06-ac5d-ec75e91e0b0f_source
licence ["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."]
lineage This lineage was generated by the FGDC CSDGM to 19139 transformation
metadata-date 2024-09-09
metadata-language eng; USA
metadata_type geospatial
old-spatial {"type": "Polygon", "coordinates": [[[-145.721623, 65.368219], [-144.481277, 65.368219], [-144.481277, 65.585832], [-145.721623, 65.585832], [-145.721623, 65.368219]]]}
progress completed
resource-type dataset
responsible-party [{"name": "Alaska Division of Geological & Geophysical Surveys", "roles": ["pointOfContact"]}]
spatial {"type": "Polygon", "coordinates": [[[-145.721623, 65.368219], [-144.481277, 65.368219], [-144.481277, 65.585832], [-145.721623, 65.585832], [-145.721623, 65.368219]]]}
spatial_harvester true
temporal-extent-begin 1991-01-01
temporal-extent-end 2024-01-01
Gruppi
  • AmeriGEOSS
  • National Provider
  • North America
Tag
  • AmeriGEO
  • AmeriGEOSS
  • CKAN
  • GEO
  • GEOSS
  • National
  • North America
  • United States
  • alluvial deposits
  • alluvial fan
  • alluvium
  • bates creek
  • bear creek
  • bedrock creek
  • berry camp
  • birch creek
  • bonanza creek
  • bottom dollar creek
  • boulder creek
  • buckley bar creek
  • butte creek
  • circle hot springs
  • circle mining district
  • colluvial deposits
  • colluvium
  • cripple creek
  • crooked creek
  • deadwood
  • deadwood creek
  • dome creek
  • eagle creek
  • eagle summit
  • easley creek
  • eolian
  • fish creek
  • floodplain
  • floodplain alluvium
  • fluvial deposits
  • fossils
  • gelifluction
  • geochronology
  • geologic map
  • geology
  • geomorphology
  • glacial
  • glacial deposits
  • gold dust creek
  • gravel
  • greenhorn creek
  • half dollar creek
  • holdem creek
  • hot springs creek
  • independence creek
  • ketchem creek
  • ketchem dome
  • mammoth creek
  • mastodon
  • mastodon creek
  • mastodon dome
  • mastodon dome glaciation
  • miller creek
  • non-metals
  • paleozoic
  • peat
  • permafrost
  • permafrost and periglacial
  • photogeologic lineaments
  • pinnell trail
  • porcupine creek
  • porcupine dome
  • portage creek
  • ptarmigan creek
  • quaternary
  • sawpit creek
  • slate creek
  • surficial
  • surficial geologic map
  • surficial geology
  • switch creek
  • tailings
  • terrace alluvium
  • tertiary
  • traverse creek
  • two-bit creek
  • unconsolidated deposits
  • undifferentiated bedrock
  • willow creek
  • yankee creek
isopen False
metadata_created 2025-09-24T06:50:14.521230
metadata_modified 2025-09-24T06:50:14.521240
notes Surficial geologic map of the Circle mining district, Alaska, Report of Investigation 95-2C, presents results from a geologic investigation of surficial deposits in parts of the Circle B-1, B-2, B-3, B-4, C-2, C-3, and C-4 quadrangles. The surficial deposits of the Circle mining district have long been sources of placer gold and even alluvial diamonds. Throughout most of the map area, the bedrock surface is blanketed by periglacial slope deposits consisting of silty rubble with angular and subangular clasts of local bedrock. This unconsolidated unsorted material was produced by intense frost shattering of bedrock and was spread downslope by mass movement processes. These processes are still active in the area today. In valley bottoms, terrace and floodplain alluvium consist of coarse, angular to subangular gravels. In upland valleys, the locally auriferous are commonly mixed with slope debris. Radiocarbon dating of organic sediments ranges in age from mid-Wisconsonian to Holocene. Although frost is discontinuous, sentiments in the valley are generally frozen and locally contain bones of large extinct vertebrae. Although landforms have been extensively modified by erosion, frost action, and mass movement, recognizable glacially modified valleys, silty gravel, and till provide evidence of at least one former glaciation. Glaciation of North Harrison Creek probably had a significant effect on the distribution of nuggets there. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/2516.
num_resources 2
num_tags 88
title Surficial geologic map of the Circle mining district, Alaska