北支の礬土頁岩-開発と利用

抄録

Aluminous shale is a sort of shale which contains considerable amounts of minute grains of diaspore besides kaolinite. There are nine layers of the shale in Permo-Carboniferous beds, which cover Ordvician limestone unconformably, and the layers are named as A, B, C, D, E, F and G from upper to lower.
Though aluminous shale, deposits in North China are found in almost all coal-fields of Permo-Carboniferous age, the deposits are only mined in such districts as Shih-men-chai, Kai-lan, Tzu-chuang and Pê-shan, where A and G layers of the shale were worked. Among 'them the deposit of G layer in Li-sui of Tza-chuang coal-field had been exploited in 1944 very quickly, on account of its best conditions for the open-cut mining of large scale, resulting to grow, only in one year, up the largest scale mine, equipped with electric hoppers of 8, 000 ton capacity, railways, locomotives etc. which amount to the ability of annual 400 thousands tons production.
The standard and usage of the are were as follows :
It is a boasted fact that during the War II, Japan could produce 30 thousands tons of aluminium from the shale, and that the telegraph wires which connect, even now, Sui-fêng powerhouse to An-shan Iron Works and to Ta-lien City in Manchuria, which distance amounts to about 1, 000km long, were made of above-mentioned aluminium.
In spite of the employees' exertion to keep off Chinese mob, all modern equipments were completely destroyed, soon after Japan' s defeat. And it is said that even steel frames of the hopper were dug out from cement as scrap iron.