Actemium Bea Balkan Ltd. Alki-L EOOD Asarel Investment AD Asarel-Medet JSC BAPIM Belogradchik Mining Company BN-Consult Enginering LTD. BNSS Ltd. Bulgaria Alpha EAD Bumar JSC Denkstatt Bulgaria ltd. DIAL  LTD Dionyssomarble Bulgaria Ltd. Dundee Precious Metals Chelopech EAD Ecotechconsult ltd. Ellatsite-Med AD EnviroChemie Bulgaria EOOD Euromax Exploration Services Ltd. Eurotest-Control EAD Exploration and Production Oil and Gas  JSC Explosivprogress-GTM EOOD Fundament LTD. Geoprodukt JSC Geoproject EOOD Geops-Bolkan Drilling Services Ltd GeoServiceEnhineering JSC Geostroy AD Geotehmin OOD Geotrading АD Hemus-M JSC Imerys Minerals Bulgaria AD Infraproject Consult LTD. Ingconsult EOOD Kaolin JSC Lyulyaka Materials EAD M & K Service Ltd. Marin Baturov Ltd. MDZ Balsha EAD Metso Minerals Bulgaria Mini Marica-Iztok EAD Minproekt EAD Minstroy Holding JSC Minstroy Maritsa Iztok JSC Niproruda JSC Ognyanovo K JSC Orika Med Bulgaria JSC Overgas INC. AD Polimetimportexport LTD. Rudmetal JSC Sandvik Bulgaria Ltd Schneider Electric Bulgaria ltd. Sigma Bulgaria SK-13 Patstroy JSC SMA Mineral Ltd SMS-S OOD SSAB Bulgaria Tera Ars EOOD Thrace Resources Ltd. Union Consult LTD. University of Mining and Geology St. Ivan Rilski Zlatna Panega Cement AD Actemium Bea Balkan Ltd. Alki-L EOOD Asarel Investment AD Asarel-Medet JSC