/biz/ - Business & Finance

>>53746639
both, but the vast majority are plugged with foam and concrete. We put in a lattice of iron, run pipes through it for ventilation and measuring water, and then we foam fill the whole lattice. After that we pour concrete leaving the pipes exposed. Lastly we put a cage over the tops of the pipes with a lock on it.

Adits get a bulkhead and concrete fill usually, then covered with soil and planted with native plant seed.

Owners here have argued that it makes the mine impossible to reopen, but that has always failed in court because the existing openings aren't safe or legal to enter, and if someone wanted to work the ore they'd have to either drive new shafts or completely reframe the existing shafts, and a plug wouldn't be a significant barrier to entry.
>>53746107
>Nobody has ever been led astray by GPS coordinates.
The feds and states have spent the last 20 years hiring every GIS grad they can get at top dollar. We know where the mines are.
picrel is one of the last open shafts in my county. Center of the pic the timbers are the remains of the headframe. Double shaft that drops hundreds of feet to water and over a thousand feet to the bottom. The owner sued to keep it open but will undoubtedly lose.