Average crude production in oil-rich Guyana declined to 664,000 barrels per day (bpd) in June from 667,000 bpd the previous month, the government said.
Guyana, where all oil and gas output is controlled by a consortium led by US major Exxon Mobil since the country inaugurated offshore production in 2019, expects to surpass 900,000 bpd of capacity later this year once a fourth floating output facility begins operations.
In June, production at the Liza 2 project increased but was not enough to offset a fall at the Liza 1 project, the figures showed.
Despite the June decline, the South American country's oil output averaged 639,000 bpd in the first half of this year, above the 623,000 bpd of the same period last year.
Guyana's government separately reported $191 million from its share of oil sales last month, bringing total income from sales and royalties in the first half of the year to $1.22 billion.
The Exxon-led group, which also includes China's CNOOC and Chevron after its acquisition of US producer Hess, had recovered a total of $35.9 billion in expenses through the end of the first quarter, a report from Guyana's central bank said.
Two audits about the recovery of the Exxon consortium's expenses have been completed in recent years, and the parties are now discussing how to conciliate their disagreements over figures after one of the disputes was marked for arbitration.
(Reporting by Kemol King, writing by Marianna Parraga, editing by Susan Fenton)