What you describe is some sort of lesser evil - I still fail to see the massive positive force. Modus operandi for centuries has been to exploit the hell out of any country, be it Africa, Indonesia or South America and give nothing and take everything.

Only if government is not utterly corrupt and doesn't pocket nearly 100% of income from the mine can there be some lasting benefits for the country. Its just a continuation of theft and exploitation that made Europe so rich for last few hundreds of years, albeit with 21st century 'we care' face. Travel a bit in countries that were raped like this, ie Potosi in Bolivia to get full picture of where this sort of business came from.

So while few pocket some average income while the mine lasts, country is stripped blank of its most precious resources... and that is supposed to be something positive? I have somewhat higher moral standards than this to consider these kind of operations at least slightly moral and justifiable.