The new measure, however, falls short of miners' demands to keep 80% of their export earnings in foreign currency.
The foreign currency-starved southern African country requires all exporters to convert part of their export earnings into local currency at an official exchange rate significantly higher than the widely used black market exchange rate, leading to losses for the businesses.
Some international miners with operations in Zimbabwe include Anglo American Platinum, Impala Platinum, Sibanye Stillwater, Zhejiang Huayou Cobalt, Sinomine Resource Group, Tsingshan Holding Group and Sinosteel Corporation.
"Export retentions have been increased and standardised at 75% across all sectors," the Reserve Bank of Zimbabwe (RBZ) said in a monetary policy statement on Thursday.
Zimbabwe has significant mineral resources, including gold, platinum group metals, coal and lithium, which has attracted international firms, especially from China. Over the years, the country has struggled to attract significant foreign investment due to concerns over foreign currency rules and policy uncertainty.
In December, Zimbabwe banned raw lithium exports, targeting marauding artisanal miners who were digging up old mines in search of the mineral.
However, the ban triggered fears Zimbabwe could be defaulting to a resource nationalism stance, four years after the government scrapped a law that required local control of all major mines.
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