Minnesota Geological Survey
Open File Report OFR-07-01

TILL GEOCHEMICAL AND INDICATOR MINERAL RECONNAISSANCE OF 
MINNESOTA

L. Harvey Thorleifson, Kenneth L. Harris, Howard C. Hobbs, Carrie E. Jennings,
Alan R. Knaeble, Richard S. Lively, Barbara A. Lusardi, and Gary N. Meyer.

February 2007

1 zip file (ind_datafiles.zip) that contains Excel data files used to create 
the pdf images listed below.

15 pdf files.  Including one report document, 7 pdf files of data and 7 pdf 
files of 
distribution maps.  Report, tables and maps have been divided into separate 
files to make 
downloads easier.  The largest pdf is approx. 12.5 mb.

List of pdf files:

01_Report.pdf  --  report outlining survey design, sampling methods, laboratory 
protocols and summary of results.
 

02_Field_and_lithologic_data.pdf --  tables containing field data.
 

03_Field_and_lithologic_maps.pdf -- distribution maps of field and lithologic 
data.
 

04_Heavy_mineral_counts_ungrouped_data.pdf -- tables of bulk mineralogy; heavy 
mineral fraction.
 

05_Heavy_mineral_counts_ungrouped_maps.pdf -- distribution of bulk mineralogy; 
heavy mineral fraction.
 

06_Heavy_mineral_counts_grouped_data.pdf -- tables of bulk mineralogy; heavy 
mineral fraction grouped by mineral type.
 

07_Heavy_mineral_counts_grouped_maps.pdf -- distribution of bulk mineralogy; 
heavy mineral fraction grouped by mineral type.
 

08_Geochemistry_63micron_data.pdf -- tables of silt/clay (<63 micron) geochem 
data.
 

09_Geochemistry_63micron_maps.pdf -- distribution of silt/clay (<63 micron) 
geochem data.
 

10_Geochemistry_HMC_NA_data.pdf -- tables of (<250 micron) geochem data from the 
nonferromagnetic heavy mineral fraction by neutron activation.
 
11_Geochemistry_HMC_NA_maps.pdf -- distribution of (<250 micron) geochem data 
from the nonferromagnetic heavy mineral fraction by neutron activation.
 

12_Geochemistry_HMC_ICP_data.pdf -- tables of (<250 micron) geochem data from 
the nonferromagnetic heavy mineral fraction by ICP/MS, partial leach.
 

13_Geochemistry_HMC_ICP_maps.pdf -- distribution of (<250 micron) geochem data 
from the nonferromagnetic heavy mineral fraction by ICP/MS, partial leach.
 

14_Indicator_mineral_counts_data.pdf -- tables of indicator mineral count data 
obtained by visual identification; SEM checks and mineral chemistry.
 

15_Indicator_mineral_counts_maps.pdf -- distribution of indicator mineral count 
data obtained by visual identification; SEM checks and mineral chemistry.
 
One folder containing jpeg images showing photos of heavy mineral grain mounts, 
referenced in Addendum 1 of report. 


For further information or to obtain digital data, contact:
Dr. L. Harvey Thorleifson, (thorleif@umn.edu) Minnesota Geological Survey, 2642 
University Ave. St. Paul, Minnesota, 55114-1057, 612-627-4780.