Africa Geology and Mineral Occurrences: A dataset for use in Geographic
Version 1.1 2-10-98
Version 2.0 3-15-99
Version 1.1 2-10-99
The dataset is compiled for use in
a GIS. The primary data source is the publication Les mineralisations
auriferes de l'Afrique de l 'Ouest or West African gold deposits edited
by Jean-Pierre Milesi and published by the BRGM in 1989. The base map layers
are from the Digital Chart of the World. The digital elevation model is
from the 30 arc second data from the USGS. Additional deposit information
has been added from Mining Journal and Mining Magazine. The dataset is
available in MapInfo, ArcExport and ArcView GIS file formats and as Adobe
This dataset is for use as a single
copy and may not be distributed to others. Those wishing to do so should
make arrangements with GeoMax.
Projection: Equidistant Cylindrical
Datum: WGS 84
Description of the constituent files
are provided as metadata geology.txt, metadata basemap.txt and metadata
mineralization.txt. Attributes1.txt contains full field names for the geology
or geo_poly file and it can also be used if one prefers to deal with the
geologic attributes through a query or join table. Joining can be done
on the Number field. Presently all the attributes are held in the geo_poly
Attributing of the geology including
lines and lithologies is derived from the text and legend of Milesi, 1989
and should be relatively clear on its own to a geologist familiar with
the area or explicit with reference to the original text.
The mineral occurrences and ore deposits
are attributed with information from the legend of the original map, not
directly from the tables in the text as these have no location information.
The ore deposits could be partially referenced against the table in the
text by name. The mineral occurrences on the map have no names and thus
cannot be easily be referenced.
Version 2.0 3-15-99
The major additions are two files
containing locations and information for approximately 49 concessions taken
from Mining Journal, information on company websites and E&MJ and 53
new and updated mine, deposit, occurrence and target point information.
Only information that could be located with some confidence on a map is
included. There is overlap with the ore_deposits files from version 1.1.
Both should be used and they could be combined and refined. The information
here should not be considered comprehensive.
Custom analysis, map production
and/or reports avaiable.
For question about this data
set, custom work, pricing and purchase orders contact