Exploration and planning phase

As stated earlier, the deposit was explored in GDR times between 1954 and 1980, and from 2008 to 2010, a re-evaluation took place by KSL by drilling three exploration boreholes and four wedges which were up to 1,500 meters deep. KSL also verified the original results, examined a possible extension of the deposit and tested the recoverability of the metals.

On behalf of KSL, the Company DMT GmbH conducted seismic surveys of the deep subsurface communities around Spremberg, Graustein and Schleife from January to March 2011. The results of the 3D seismic survey shed light on the structure of the underground copper deposit. The current knowledge of the deposit was confirmed.

Further planning was made possible with these results and were used to gain a better understanding of the technical conditions of the copper deposit during 2012.

Drillings

Preparation of the drilling site

  • The first step of each drill hole is the sinking of a pilot hole enclosed in a standpipe that is secured by cementation of the surrounding annular space.
  • The drill rig used for drilling the standpipe drill hole is replaced after completion of the pilot hole by a more powerful rig capable of drilling holes with a planned depth of 1,300 meters.

Exploration drilling

  • Casing is inserted with cementation, down to a depth of about 550 meters with a later addition of two lengths of casing of progressively smaller diameter into the drill hole right up to the point of intersection with ore body.
  • The drilling cuttings produced are flushed out of the hole using circulating drilling fluid.
  • The actual ore zone will be intersected by core drilling whereby a cylindrical column of drill core is drilled using a diamond-tipped drilling crown. The drill core is extracted from the hole and its ore grade is determined by laboratory assay.
  • Geophysical measurements are carried out in the ore zone as well as in the cased section of the drill hole to provide additional information on the geological structure of the deposit.
Infografik mit Bohrtiefen

Restoration of the original state

  • The environmental impact will be kept as low as possible starting with careful selection of the drilling sites.
  • After completion of drilling the borehole will be completely filled with cement slurry. After completion of the investigation the drilling fluid and cuttings are disposed of at special disposal sites licensed for this purpose. The drilling site is re-cultivated and restored to its original state.

Seismics

PROCESS OF SEISMIC INVESTIGATION

Infografik: Ablauf einer seimischen Untersuchung

1. DEFINITION OF MEASUREMENT SITES

  • In the first phase, the measurement lines were determined and marked for the geophones and the locations of the vibration vehicles.
  • Geophones were laid out along with test leads and measuring boxes along the measurement lines.

 

2. SEISMIC MEASUREMENTS

  • At the beginning of the measurement campaign vibration vehicles generated the necessary signals at the designated locations.
  • These signals were recorded from different layers in the subsurface and reflected according to their texture back to the surface. Highly sensitive geophones took the geophysical signals and converted them into electrical data, which was stored and analyzed.

 

3. RESTORING THE MAIN CONDITION

  • After completion of the measurement campaign in March 2011, all instruments and vehicles were removed.
  • The final report was completed in late 2011 and handed over to KSL.

 

WHO CONDUCTED THE RESEARCH?

KSL Kupferschiefer Lausitz GmbH commissioned the company DMT GmbH & Co. KG from Essen for the geophysical investigations. DMT operates worldwide creating geological studies (3D-seismic and others).

WHAT IS THE IMPACT ON THE ENVIRONMENT?

Seismic waves from the vibrating vehicles produce small vibrations, which are barely perceived by humans and animals. This method of investigation shows no harmful side affects for humans and the environment.



Kupferschieferlausitz

KSL