This publication contains the results of a national mineral resource assessment study. The study (1) identifies regional tracts of ground believed to contain most of the nation's undiscovered resources of gold, silver, copper, lead, and zinc in conventional types of deposits; and (2) includes probabilistic estimates of the amounts of these undiscovered resources in most of the tracts. It also contains a table of the significant known deposits in the tracts, and includes descriptions of the mineral deposit models used for the assessment.
The assessment was previously released in two major publications. The conterminous United States assessment was published in 1996 as USGS Open-File Report 96-96. Subsequently, the Alaska assessment was combined with the conterminous assessment in 1998 and released as USGS Circular 1178.
This new recompilation was undertaken for several reasons. First, the graphical browser software used in Circular 1178 was ONLY compatible with the Microsoft Windows operating system. It was incompatible with the Macintosh operating system, Linux, and other types of Unix computers. Second, the browser on Circular 1178 is much less intuitive to operate, requiring most users to follow a tutorial to understand how to navigate the information on the CD. Third, this release corrects several errors and numbering inconsistencies in Circular 1178.
(Click on image to view larger version.)
Viewing Online Files
One way to begin examining the results of the national assessment immediately is to proceed as follows:
Other Files in Open-File Report 02-198
You can download compressed files for the Alaska Assessment [13 MB]
See the readme file for more information.
Alaska_Asssessment\Doc-ReadMe1st.html - User manual for Circular 1178
National Mineral Resource Assessment -- Frequently Asked Questions
Alaska_Asssessment\KNOWNDEP_AK.XLS- Significant Known Deposits of Alaska (Excel)
Alaska_Asssessment\MODELLIST_AK.XLS- Description of Deposit Models (Excel)
Alaska_Asssessment\RATIONALE_AK.DOC- Permissive Tract Text Descriptions and Rationale for Estimates (Word)
Alaska_Asssessment\REFERENCE_AK.DOC- References for the Alaska assessment (Word)Download-Alaska_Asssessment\SHAPEFILES_AK (folder) - Tract maps in ESRI ArcGIS shapefile format (ARC/INFO 7.0.3) This folder contains 165 tract maps in ESRI ArcGIS vector polygon shapefile format. Also included are the region and Alaska coastline polygon shapefiles.
Alaska_Asssessment\TRACTLIST_AK.XLS - Permissive Tracts and Estimated Numbers of Undiscovered Deposits (Excel)
Alaska_Asssessment\TRACTMAPS_AK.PDF- (14.5 MB) Tracts and regions in vector graphics format. (Adobe Acrobat)
This publication includes OFR 96-96 and many files modified from those on Circular 1178. The GIS software from Circular 1178 is not included. Both of the original national assessment publications can be downloaded from the following Internet sites:
This product (OFR 02-198) is available for sale in CD format from USGS Information Services.
For questions, please contact Paul Schruben.