Drilling blast holes

Mining engineers calculate how the walls and paths need to be sloped, shored up, and shaped to prevent collapse. This channel on YouTube has a lot of good content about stuff like this, but this video is about hole collapses and how they're prevented. Reminds me of the old engineering adage- "anyone can build a bridge, but it takes an engineer to just barely build a bridge." Same goes for anything we do. You can do a lot by over-building and just accepting inefficiencies, but in a case like this you want to excavate as much of the ground as possible so you want the slopes to be as steep as possible. Anyone can dig a stable hole that's like a pyramid where the slopes are very shallow, but engineers find exactly how steep you can safely get away with.

Sometimes they do https://news.sky.com/video/deadly-collapse-of-open-pit-mine-in-inner-mongolia-china-with-dozens-of-workers-missing-12817613

I try to pick from a variety of sources, but it's tempting to make this community nothing but toolgif reposts for a few weeks. There are so many cool things to share.