Offers originally were due to be opened June 29.
The blocks border the Salina Grande I area that was tendered last year and each covers 415km2.
Bidding rules cost US$5,000 and can be purchased from the office of the province's deputy hydrocarbons and mining ministry.
If commercial hydrocarbons are found during the exploration period, the exploration permit would be converted to a 25-year production concession.
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