Answer; none.

If the federal and state environmental agencies monitor and regulate the mine half as much as they do large cattle feeding operations and the gas and oil industry id bet there won't be any large scale or environmental changing pollution happening.

He just did a quick Google search and basically copied the first paragraph. Dig deeper it isn't quite just what it says.

When there is no place left with clean water you,your children and grandchildren can drink out of the mine arsenic slime dams.

Pillage other country's resources first

Is safe clean drinking water becoming an increasing problem? I know some dryer regions suffer because of overall availability but im not sure polluted water is really much of an issue here in the USA. Has mining ruined the drinking water in your area?

We will just pipe clean water in from the Great Mother Canada.

Mines are known to pollute water.
Big nickle mine opening up in the next few years at the headwaters of a drainage on one of my traplines.
They have already informed all the stakeholders the river will be polluted with heavy metal.
Mines are important as I said my son is a miner,but there are certain places where they dont need to be.
The nickle mine is not polluting a source of any town drinking water,but I wont be eating fish out of that particular river in a few years when the mine starts producing.

So, either you go fish somewhere else or they try to mine nickel somewhere else? Tis a quandary. Do you, typically, fish where there are no fish?

What company is opening the mine, Boco?

Canada Nickle.

Yes, safe drinking water is definitely becoming a problem. Des Moines has the largest nitrate removal system in the world, and has to run the system more every year.

Another bad water polluter is agriculture.
A bunch of people were killed in a small southern Ontario town a few years ago from e-coli that got into the town drinking water from cattle.
Papermills also bad polluters.
In north western Ontario a bunch of people were poisoned from mercury in the river systems.
That was back in the 70s and fish are still loaded with mercury in NW Ontario in those systems.

Agriculture is responsible for Iowa's nitrate problem.

So MNR sent out a letter stating they were going to pollute the water with heavy metals? Can you post a copy of the letter or email?

I think he was saying the company, Canada Nickel, did. Which also seems quite unlikely to me.

They had to disclose everything in their impact benefit agreement with the FN,or they would not have been able to proceed.FN is a major shareholder/owner of the mine.

For those who don't like mines,start living with the Amish.

^^^^^
Or if you're really serious about saving the planet; the bushmen of sub sahara Africa.

But we need to mine these metals so we can go all electric and save the planet from climate change.