It said a laptop had been stolen during a domestic burglary, and an unnamed third party had accessed the firm’s electronic systems.
ENRC did not say what kind of information might have been lost through the theft or hacking incidents, but it has briefed staff on the breaches and updated its security systems.
The FTSE 100 company said it had also notified the Information Commissioner.
The announcement comes at a tricky time for ENRC, which has lost a string of directors in recent months and is under investigation by the Serious Fraud Office for possible fraud, bribery and corruption.
The Kazakh-focused miner is also fending off takeover advances from three of its founding shareholders, working alongside FTSE 100-listed resources group Kazakhmys.
The billionaire investors have been given until 3 June to improve on their initial offer, which was last week dismissed by ENRC’s independent directors as undervaluing the firm.