Giving a statement in the Rajya Sabha, Jaiswal said an inter-ministerial committee has been constituted to look into the matter.
"The CBI has asked for 157 documents of companies which had applied prior to June 2004 but have not been allocated coal blocks, apart from few other files and documents," he said.
"Since some documents could not be located in the coal ministry, I have constituted an inter-ministerial committee under the chairmanship of additional secretary (coal) on July 11 to look into the matter," he said.
He assured the house that "all efforts are being made to locate documents, which are not readily available in the coal ministry".
"I would like to assure the house that my ministry would leave no stone unturned in tracing and providing the documents sought by the CBI," he added amidst uproar by the Bharatiya Janata Party, which demanded that the minister should name the companies whose files were missing.