Potosi is well worth the visit, if anybody had ever doubts how brutal slavery could be, look no more. Slaves lasted 6 weeks before dying horribly in some of the jobs they had, mostly in ore processing parts. Or if you want to see why its really not a good idea to be pregnant in >4000m altitude, look at their local church.

Mines themselves are surprisingly still open and locals work there, even if they know very well within 15-20 years most of them will develop aggressive lung cancer. IIRC its from fine silica dust that is all over those mines in form of thick dust (and sometimes even raw crystals form on the walls). The hill in which the mines are is pure emmental, around 5000 entries IIRC from various directions and ages.

Visited them with my wife/fiancée few years ago, local woman whose husband died from what I described above guided us quite deep inside. Never saw actual red sticks of dynamite with the burning string till that day. We offered very strong alcohol and coca leaves to Pachamama, had some leaves with 'activator' ourselves (and then went blabbing for half an hour due to mouth and tongue anesthesia). Those silica in the air are not benign, so there are warnings everywhere (and good modern masks should definitely help, we didn't have those unfortunately this was well before covid).

A powerful experience, as backpacking around whole Bolivia is, to us its the most interesting country in South America to visit for intense adventure and lifelong memories. Yungas death road on a rented bike is another very memorable experience, from snowed plains and glaciers 4700m high into jungle in few hours.