The Central African Republic Diamond Database (2018) - Archival ASM and Diamond Occurrences Dataset

Identification_Information:

Citation:

Citation_Information:

Originator: Peter G. Chirico
Originator: Jessica D. DeWitt
Originator: Sarah E. Bergstresser
Originator: Inga E. Clark
Publication_Date: 2018
Title:

Geospatial_Data_Presentation_Form: GIS data
Publication_Information:

Publication_Place: Reston, VA
Publisher: U.S. Geological Survey

Online_Linkage: https://doi.org/10.5066/F74748M5
Larger_Work_Citation:

Citation_Information:

Originator: DeWitt, Jessica D.
Originator: Chirico, Peter G.
Originator: Bergstresser, Sarah E.
Originator: Clark, Inga E.
Publication_Date: 2018
Title:

The Central African Republic Diamond Database – A Geodatabase of Archival Diamond Occurrences and Areas of Recent Artisanal and Small-scale Diamond Mining

Geospatial_Data_Presentation_Form: Open File Report
Publication_Information:

Publication_Place: Reston, VA
Publisher: U.S. Geological Survey

Description:

Abstract:

This GIS dataset is a point shapefile, wherein each point describes the location of a diamond occurrence recorded in a variety of published and unpublished forms. For this purpose,'diamond occurrence' is defined as locations where diamonds have been recovered or observed. Sources of diamond occurrence are diverse and potentially include fieldwork, reports of artisanal mine sites, diamond mining company sample records, geologic maps and mine sites interpreted from satellite imagery acquired prior to January 1, 2013.

Purpose:

These data were collected as part of a larger Diamond Database for the Central African Republic, with the goal of describing the geographic distribution of archival and current diamond occurrences in order to examine links between diamond resources and violent conflicts in the country.

Supplemental_Information:

A second dataset, titled "The Central African Republic Diamond Database - Recent ( 2013-2016) Mining Activity" is closely associated with this dataset, and both should be used in describing the geographic distribution of CAR's diamond resources.

Time_Period_of_Content:

Time_Period_Information:

Multiple_Dates/Times:

Single_Date/Time:

Calendar_Date: 1964

Single_Date/Time:

Calendar_Date: 1972

Single_Date/Time:

Calendar_Date: 1976

Single_Date/Time:

Calendar_Date: 1980

Single_Date/Time:

Calendar_Date: 1983

Single_Date/Time:

Calendar_Date: 1991

Single_Date/Time:

Calendar_Date: 1993

Single_Date/Time:

Calendar_Date: 1994

Single_Date/Time:

Calendar_Date: 1996

Single_Date/Time:

Calendar_Date: 1998

Single_Date/Time:

Calendar_Date: 2004

Single_Date/Time:

Calendar_Date: 2005

Single_Date/Time:

Calendar_Date: 2007

Single_Date/Time:

Calendar_Date: 2008

Single_Date/Time:

Calendar_Date: 2010

Single_Date/Time:

Calendar_Date: 2013

Currentness_Reference:

Publication dates for articles, maps, etc. used as reference to create the dataset

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: 14.462403948899
East_Bounding_Coordinate: 27.426271135882
North_Bounding_Coordinate: 10.96233471064
South_Bounding_Coordinate: 2.3719315539959

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: gem resources
Theme_Keyword: placer deposit mining

Place:

Place_Keyword_Thesaurus: CommonGeographicAreas
Place_Keyword: Central African Republic

Stratum:

Stratum_Keyword_Thesaurus: LithClass6.2
Stratum_Keyword: Alluvium

Access_Constraints: none
Use_Constraints:

Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originator of these data in future products or derivative research.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Peter G. Chirico
Contact_Organization: U.S. Geological Survey

Contact_Address:

Address_Type: mailing and physical
Address: 12201 Sunrise Valley Dr.
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA

Contact_Voice_Telephone: 703-648-6950
Contact_Electronic_Mail_Address: pchirico@usgs.gov

Data_Set_Credit:

U.S. Department of State, U.S. Agency for International Development

Cross_Reference:

Citation_Information:

Originator: Chirico, Peter G.
Originator: DeWitt, Jessica D.
Originator: Bergstresser, Sarah E.
Originator: Clark, Inga E.
Publication_Date: 2018
Title: Recent mining areas 2013-2017
Publication_Information:

Publication_Place: Reston, VA
Publisher: U.S. Geological Survey

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: No formal attribute accuracy tests were conducted

Logical_Consistency_Report: No formal logical accuracy tests were conducted
Completeness_Report:

Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: No formal positional accuracy tests were conducted

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: No formal positional accuracy tests were conducted

Lineage:

Process_Step:

Process_Description:

Locations of historic ASM activity and diamond occurrences were compiled into the Archival Diamond Occurrence point geodatabase from a variety of published and un-published data sources. For this purpose, diamond occurrence is defined as locations where diamonds have been recovered. Source records of historic diamond occurrences are diverse and may include fieldwork, reports of artisanal mine sites, diamond mining company pit sample records, geologic maps and mine sites interpreted from satellite imagery prior to 2013. Each diamond occurrence in the geodatabase was attributed with information identifying the source, the publication year of the source, and the type of diamond occurrence. (i.e. ASM site, field sample, and occurrence). Additional details regarding the compilation of this dataset can be found in the OFR assocaited with the dataset's publication (DeWitt and others, 2018)

Process_Date: 2017

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference:

Latitude and longitude coordinates, World Geodetic System 1984 (WGS84) Universal Transverse Mercator (UTM) Zone 34 N coordinates

Direct_Spatial_Reference_Method: Point

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Transverse Mercator
Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: 21.0
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000.0
False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:

Abscissa_Resolution: 10.0
Ordinate_Resolution: 10.0

Planar_Distance_Units: METERS

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Archival Diamond Occurrences in the Central African Republic
Entity_Type_Definition: archival diamond occurrence geographic locations and attributes
Entity_Type_Definition_Source: USGS Artisanal Diamonds Project

Attribute:

Attribute_Label: OBJECTID
Attribute_Definition: Unique identifier number for each point record
Attribute_Definition_Source: Automatically named and populated by ESRI ArcGIS 10.4
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1
Range_Domain_Maximum: 2604

Attribute_Domain_Values:

Codeset_Domain:

Codeset_Name: Shape
Codeset_Source: ESRI ArcGIS 10.4

Attribute:

Attribute_Label: UniqueID
Attribute_Definition:

Non-GIS unique identification code that links each point to the source (map or otherwise) that it came from

Attribute_Definition_Source: USGS Artisanal Diamonds Project
Attribute_Domain_Values:

Unrepresentable_Domain:

The first 3 letters of the point record's source, followed by a sequential, unique, whole number labeling the record within that source.

Attribute:

Attribute_Label: Source
Attribute_Definition:

The author and date of the source data from which the point was collected.

Attribute_Definition_Source: Data source citation
Attribute_Domain_Values:

Unrepresentable_Domain:

This field describes the author and date of the source from which the point record was collected. Using this information, the source's full citation information may be found in the OFR publication for this work (DeWitt, et al. 2017).

Attribute:

Attribute_Label: Source_Dat
Attribute_Definition: Source Date: The year in which the data source was published.
Attribute_Definition_Source: Data source citation
Attribute_Domain_Values:

Unrepresentable_Domain:

The publication year of the data source. This column may be sorted to help identify contemporary and older points in the dataset.

Attribute:

Attribute_Label: Source_Cat
Attribute_Definition:

Source Category: A generalized descriptor of the type of source from which the point record was collected

Attribute_Definition_Source: USGS Artisanal Diamond Project
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Article
Enumerated_Domain_Value_Definition:

Textual document/record, published in a peer-reviewed journal, containing a map with diamond occurrences or a table of diamond occurrence location coordinates.

Enumerated_Domain_Value_Definition_Source: USGS Artisanal Diamonds Project

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Field Data
Enumerated_Domain_Value_Definition: In Situ observation of diamond occurrences by the USGS or USAID
Enumerated_Domain_Value_Definition_Source: USGS Artisanal Diamonds Project

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Map
Enumerated_Domain_Value_Definition:

Cartographic product with points or polygons indicating areas of diamond mining

Enumerated_Domain_Value_Definition_Source: USGS Artisanal Diamonds Project

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Map and Text
Enumerated_Domain_Value_Definition:

Cartographic product with points or polygons indicating areas of diamond mining, accompanied by textual report of mineral resources

Enumerated_Domain_Value_Definition_Source: USGS Artisanal Diamonds Project

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Report
Enumerated_Domain_Value_Definition:

Documented observations from a mining company or other informal publication

Enumerated_Domain_Value_Definition_Source: USGS Artisanal Diamonds Project

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Satellite Imagery
Enumerated_Domain_Value_Definition:

Observation of ASM indicators in very high resolution (VHR) panchromatic or multispectral satellite imagery - see OFR section 'Interpretation of Recent (2013-2016) Mining' for details

Enumerated_Domain_Value_Definition_Source: USGS Artisanal Diamonds Project

Attribute:

Attribute_Label: Type
Attribute_Definition:

Observation Type: provides generalized description of the level of detail or accuracy that a point record may have.

Attribute_Definition_Source: USGS Artisanal Diamonds Project
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: ASM Site
Enumerated_Domain_Value_Definition:

Indicates a location at which diamond ASM mining was observed, but without specific information regarding the presence or absence of diamonds at the site

Enumerated_Domain_Value_Definition_Source: USGS Artisanal Diamonds Project

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Field Sample
Enumerated_Domain_Value_Definition:

Indicates a location at which detailed observations have been made of surficial geology and/ or diamond resources, typically from a Report

Enumerated_Domain_Value_Definition_Source: USGS Artisanal Diamonds Project

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Diamond Occurrence
Enumerated_Domain_Value_Definition:

Generic observation indicating a location at which diamonds have been recovered

Enumerated_Domain_Value_Definition_Source: USGS Artisanal Diamonds Project

Attribute:

Attribute_Label: Latitude
Attribute_Definition:

Y coordinate, in decimal degrees of WGS 84 for the point record's location

Attribute_Definition_Source: WGS 1984
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -90
Range_Domain_Maximum: 90
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: Longitude
Attribute_Definition:

X coordinate, in decimal degrees of WGS 84 for the point record's location

Attribute_Definition_Source: WGS 1984
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -180
Range_Domain_Maximum: 180
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: N_UTM34N
Attribute_Definition:

Y coordinate, in meters of WGS 84 UTM 34N for the point record's location

Attribute_Definition_Source: WGS 84 UTM 34 N
Attribute_Domain_Values:

Unrepresentable_Domain: projected coordinates

Attribute:

Attribute_Label: E_UTM34N
Attribute_Definition:

X coordinate, in meters of WGS 84 UTM 34N for the point record's location

Attribute_Definition_Source: WGS 84 UTM 34 N
Attribute_Domain_Values:

Unrepresentable_Domain: projected coordinates

The Central African Republic Diamond Database (2018) - Archival ASM and Diamond Occurrences Dataset

Metadata: