Zimbabwe Regional Geochemical Survey CD-ROM Version 2.0: September 2007

BGS research – International geochemistry CD-ROM series

During the period 1982–86, a team of geologists from BGS carried out a programme of regional geological mapping and geochemical exploration in collaboration with the Zimbabwe Geological Survey under a Technical Co-operation agreement supported by the UK Department for International Development (DFID) (formerly ODA). Three regions of Zimbabwe were mapped and the results of the stream sediment geochemical surveys were presented as three reports.

  1. Dunkley, P.N. 1987. A regional drainage geochemical exploration survey of the Harare area, Zimbabwe. Research report of the British Geological Survey, No MP/87/18.
  2. Dunkley, P.N. 1987. A regional drainage geochemical exploration survey of the country between Rushinga and Nyamapanda, north-east Zimbabwe. Research report of the British Geological Survey, No MP/87/16.
  3. Dunkley, P.N. 1987. A regional drainage geochemical exploration survey of the Makaha area, north-east Zimbabwe. Research report of the British Geological Survey, No MP/87/17.

These reports are available through the BGS sales desk.

This work pre-dated the desktop PC era and the analytical data was stored on a Cifer 1880 microcomputer and PDP11 magnetic tapes. These data have recently been transferred to PC format and stored as a CD-ROM database. Some of the XRF data was lost from the original PDP11 tapes and these results are now represented as absent data (-1). Several erratic Ta and Ba highs from the Rushinga and Nyamapanda data set have also been replaced with -1. In the original reporting it is believed that these records were removed from the data set and this accounts for the difference in the number of samples reported here and those used in the technical report.

During preparation of the CD-ROM the data has also been ‘cleaned’ by replacing all 0 (below detection values) with a value 2/3rds the reported detection limits (rounded to an integer) i.e.

Element Detection Limit (ppm) Substitute Value
Cu11
Pb96
Zn32
Co32
Ni21
Mn2618
Li11
Sn43
W43
Ta53
Ba5436
As107

The precision of analytical methods is discussed in the reports.

All samples have UTM grid co-ordinates (UTM Zone 36K, Modified Clarke Spheriod 1880 (S.A.)). These co-ordinates have been modified since the original report to be full Easting and Northing grid references – this required an “8” to be prefixed to the original Northings.

Each data record includes a ‘LithUnit’ and ‘RockType’. These are explained in each of the reports referenced previously.

Area Harare Rushinga & Nyamapanda Makaha
Excel filenameHARARE.XLSRUSHNYAM.XLSMAKAHA.XLS
CSV filenameHARARE.CSVRUSHNYAM.CSVMAKAHA.CSV
DBF filenameHARARE.DBFRUSHNYAM.DBFMAKAHA.DBF
Minimum Easting261497393429446924
Maximum Easting340763498990490347
Minimum Northing800939380928158072997
Maximum Northing80643198 1814618092859
Number of sites1603124643298
Average density (sample per km²)2.71.553.8
Fraction used-80#-80#-80#
Elements by AASCu, Pb, Zn, Co, Ni, Mn, and LiCu, Pb, Zn, Co, Ni, Mn, and LiCu, Pb, Zn, Co, Ni, Mn, and Li
Elements by XRFAs, Ba, Sn, Ta and W (+ Pb and Ni)As, Ba, Sn, Ta and W (+ Pb and Ni)As, Ba, Sn, Ta and W (+ Pb and Ni)

Reference to the CD-ROM should be as follows:

BGS (2007). Zimbabwe Regional Geochemical Survey CD-ROM. Version 2.0. BGS International Regional Geochemistry CD-ROM Series, No.2 Zimbabwe. British Geological Survey, Keyworth, Nottingham,UK

BGS work in Zimbabwe

Central enquiries
British Geological Survey
Keyworth
Nottingham NG12 5GG
United Kingdom
Tel: +44 (0)115 936 3143
Fax: +44 (0)115 939 3276
Email: enquiries@bgs.ac.uk

Collaborating organisation: Zimbabwe Geological Survey

Director
Geological Survey Department
P O Box CY 210
Causeway
Harare, Zimbabwe
Email: zgs@africaonline.co.zw

readme.doc Information file in MS Word format
readme.pdf Information file in PDF format
makaha.csv Makaha geochemical data in comma separated variable format
makaha.xls Makaha geochemical data in MS Excel format
makaha.dbf Makaha geochemical data in dbf format
harare.csv Harare geochemical data in comma separated variable format
harare.xls Harare geochemical data in MS Excel format
harare.dbf Harare geochemical data in dbf format
rushnyam.csv Rushinga & Nyamapanda data in comma separated variable format
rushnyam.xls Rushinga & Nyamapanda data in MS Excel format
rushnyam.dbf Rushinga & Nyamapanda data in dbf format

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