Re: $260 billion gold mines going for a song, behind closed doors
Sometime government can give tax holiday to certain industries for certain length of time, but I do not think that is the case with Reko Dig.
Anyhow, tax is on-going thing and is levied on profit. Government can vary taxes every year, and could stop exemption of taxes anytime too. Anyhow, it is obvious that companies working at Reko Dig would adjust exploration cost with profit before paying taxes, and that is different matter.