Harku Quarry Co. is based in an open pit Harku. We produce crushed limestone and granite of different fractions, limestone, stone sand, fillers and filledground.

21st December 2005 Certification Center of Tallinn University of Technology awarded to Harku Karjäär Co. EC Certificate of Factory Production Control in accordance with requirements European Union standards. The Certificate was updated on 26th October 2016.

The quality parameters of our crashed limestone we check in our laboratory and meet the requirements approved by European Standards:

EN 12620 : 2002 + A1:2008 “Aggregates for concrete”
EN 13043 : 2002 + AC:2004 “Aggregates for bituminous mixtures and surface treatments for roads, airfields and other trafficked areas”
EN 13242 : 2002 + A1:2007 “Aggregates for unbound and hydraulically bound materials for use in civil engineering work and road construction”
 EN 13450 : 2002 + AC 2004 “Aggregates for railway ballast”

Our crashed stone of different fractions is produced on modern high quality crashing and screening equipment.

In 2009 the high efficiency crashing and screening plant “Metso minerals” has started operation.

Below you can find average values of our crashed stone physical and mechanical (technical) characteristics:

   Flakiness index Fl15
   Shape index Sl15
   Los Angeles coefficient  LA25
   Freeze-thaw resistance (< 2%) F2
   Particle density 2,6 мг/м3
   Water absorption 1,3%