That’s good business. We mined anthracite back in the old town, but used bituminous in our furnaces. Anthracite was sold as it was valuable. Bituminous was cheap and adequate even if the old town was black with soot.
The town I was born in is red with Beauxite dust. And yes, as you said, it makes commercial sense.
I actually wouldn’t think anything of Iran’s deciding to go nuclear - in the 1970 Westinghouse and a French company were trying to get contracts to build nuclear power plants there, after all - if it wasn’t for the fact the regime (even without taking Ahmadinejad into account) basically cannot be trusted with anything that could lead to nuclear weapons.