You've been given some examples but here are some others below. You've also got a world of information at your fingertips if you care to investigate a little bit. "All the time" is too strong but they do happen regularly from an historical perspective. I'm no expert but below are some examples I found easily.
Here
https://www2.gov.bc.ca/gov/content/...pill-incidents/past-spill-incidents/mt-polley
https://www.sierraclub.org/wisconsin/blog/2017/08/every-mine-has-polluted-water this source is biased but points out a few as well as some of the questions surround the type of mining.
Regulators in the U.S. say the study shows that dangerous levels of selenium are entering the waterways of Montana and Idaho.
montanafreepress.org
That torrent is poisoning aquatic life and tainting drinking water sources in Montana, California, Colorado, Oklahoma and at least five other states.
www.pbs.org
We can pretend that mining (sulfide mining especially) is clean, but that does not make it so. The processes involved create a lot of waste. Even if we assume that it can be done with minimal impact, there is no guarantee that there won't be spillages of the waste down the line that we all end up paying for in environmental impacts, clean up cost, and in some cases health.
I think there is a high risk of negative consequences. I do not think it's worth the risk for the relatively small number of jobs it creates, especially when the capital is owned by foreign entities.