Ган/төмрийн хүдрийн хамгийн сайн цалинтай 11 ажил …
Төмрийн хүдэр яаж олборлодог вэ? Underground mines are built in regions where ore reserves seem promising. Deposits of iron ore may be located deep within the earth. There must be an elevator or hoist installed for the shaft to be dug. More so, people and ore are carried into and out of the mine mostly by way of the ...