Drill-cores

Linked data and services:

Borehole database (in Estonian)

After boring the drill-core is kept in wooden boxes that host 4 to 10 meters of core depending on the diameter. There are about 30 000 drill-core boxes preserved in Estonia. Material owned by the state are stored at four different locations (see Figures 2-11). By the order of the state, Geological Survey of Estonia fixed up about 1000 boxes every year (meaning re-labelling, fixing and photographing). Information and photos of the drill-cores are saved in the database. This database contains also data used for compiling the Geological Base Map of Estonia. For 2015, all the drill-core boxes have been fixed. The next task is to put drill-core samples in order. Data of more than 12000 samples and over 1600 photos of the representative specimens have been entered into the Borehole database by 2017.  

Figure 1. Locations (yellow squares) and amount of drill-core boxes in January, 2005. Red dots indicate locations of the drill-holes the cores of which were checked for their condition in 2004.

Figure 2. Locations (squares) and amount of drill-core boxes in January, 2006. The dots indicate locations of the drill-holes the cores of which were checked for their condition in 2005. Color of the dot indicates the location where the appropriate drill-core box is stored.

Figure 3. Locations (squares) and amount of drill-core boxes in January, 2007. The dots indicate locations of the drill-holes the cores of which were checked for their condition in 2006. Color of the dot indicates the location where the appropriate drill-core box is stored.

Figure 4. Locations (squares) and amount of drill-core boxes in January, 2008. The dots indicate locations of the drill-holes the cores of which were checked for their condition in 2007. Color of the dot indicates the location where the appropriate drill-core box is stored.

Figure 5. Locations (squares) and amount of drill-core boxes in January, 2009. The dots indicate locations of the drill-holes the cores of which were checked for their condition in 2008. Color of the dot indicates the location where the appropriate drill-core box is stored.

Figure 6. Locations (squares) and amount of drill-core boxes in January, 2010. The dots indicate locations of the drill-holes the cores of which were checked for their condition in 2009. Color of the dot indicates the location where the appropriate drill-core box is stored.

Figure 7. Small rings indicate locations of the drill-holes the cores of which were checked for their condition in 2010. Big red dots mark repositories where the drill-core boxes are stored (with total amount of boxes written in brackets). All drill-core boxes (918) fixed up in 2010 are situated in Tuula repository.


Figure 8. Small rings indicate locations of the drill-holes the cores of which were checked for their condition in 2011. Big red dots mark repositories where the drill-core boxes are stored (with total amount of boxes written in brackets). All drill-core boxes (575) fixed up in 2011 are situated in Tuula repository.

Figure 9. Small rings indicate locations of the drill-holes the cores of which were checked for their condition in 2012. Big red dots mark repositories where the drill-core boxes are stored (with total amount of boxes written in brackets). All drill-core boxes (409) fixed up in 2012 are situated in Tuula repository.

Figure 10. Small rings indicate locations of the drill-holes the cores of which were checked for their condition in 2013. Big red dots mark repositories where the drill-core boxes are stored (with total amount of boxes written in brackets).

Figure 11. Small rings indicate locations of the drill-holes the cores of which were checked for their condition in 2014. Big red dots mark repositories where the drill-core boxes are stored (with total amount of boxes written in brackets).


Photo 1. An example of a drill-core box (drill-core no F259; from interval 136,8...141,0 m).

Photo 2. An example of a drill-core sample (drill-core no F353; from the depth of 286,1 m; amphibole-biotite gneiss)


Contact person: Reet Roosalu