天狗岱鉱山段丘砂鉄層の採掘と選鉱

抄録

To speaking generally, the present condition of iron sand industry in Japan, the beach sand.deposit are almost worked out and the residual mine life are poor. So that it became that they could F not but develop the underground deposit in large scale.
For most of mine lots that belong to Tohoku Satestu Kogyo Co. bear these underground deposit, that we have mined those deposit since a few years, pushed the rationalization by mechanizing the mining and ore dressing, and we have reduced the production cost so much.
This theory discribes about the situation. of mining and ore dressing method in “Tengutai” such as a terrace deposit, and some studies about reformation and object in future.