Mining-especially for jade-was firmly in the hands of the military and their 'crony' elites during the final years of junta rule, but remains cloaked in secrecy despite reforms under a quasi-civilian government that came to power in 2011.
The fund, drawn from a one percent levy on profits from the multi-billion-dollar extractive trade, has USD 7.8 million left from a high of USD 104 million, according to the Myanmar Gems and Jewellery Entrepeneurs Association.
He did not say how many years the fund was collected for, name the contributors or speculate what has happened to the cash.
But he said a parliamentary commission is probing the whereabouts of the cash and will soon publish its findings.
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The group, which includes major mining companies that dominate the country's trade in jade, sapphires and rubies, say the fund was set up to help develop local gem markets and associations.
"The members are worried about mismanagement of the funds," Kyaw Kyaw Oo said, adding the group hopes the country's newly installed democratic government, presided over by Aung San Suu Kyi, will deliver transparency.
Last year corruption watchdog Global Witness said Myanmar's jade industry alone was worth an estimated USD 31 billion in 2014, with most profits going to powerful military and ex-junta figures instead of the state coffers.
That estimated value would amount to almost half of the impoverished country's GDP.
Large amounts of jade are sold to China through illegal mines and in rebel-held areas.
While the price of jade has slipped in recent months, poor migrant workers still risk their lives to comb unstable pits in northern Myanmar for valuable fragments.