US citizen Justin Kapla and Filipinos Hilarion Cajucom and Cristobal David were each sentenced to more than five years late last month and have since been in a maximum-security prison.
Sprawling and sparsely-populated Mongolia enjoyed world-leading economic growth in recent years -- peaking at 17.5 percent in 2011 -- on the back of a minerals boom exemplified by the giant copper and gold Oyu Tolgoi mine, operated by Anglo-Australian resources giant Rio Tinto.
Foreign direct investment into Mongolia dropped 74 per cent last year.
The trio's pardon letters are to be finalised by Sunday, reputable online news site 24tsag.Mn reported Wednesday, citing sources in the president's office.
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"According to Mongolian law, the president has the right to pardon whomever he so choses," human rights and legal policy advisor to the president Chadraabal Unurbayar said in a statement released to the media.
The president today pardoned three Mongolian citizens serving time for tax evasion, according to his website, in a move seen as seeking to avoid accusations of bias toward foreigners.
The charges stem from a 2011 tax dispute with their former employer, coal miner SouthGobi Sands, that dragged on for years before the three were indicted in 2014.
SouthGobi Sands' parent company, Toronto- and Hong Kong-listed SouthGobi Resources, filed an appeal against the verdict on February 18.
Before entering prison, Kapla, Cajucom and David had been banned from leaving Mongolia for nearly three years.