Staircase mining method - Kaidansaikkuho
|
Also called step mining. A typical method of open-cut mining. After stripping, the deposit is excavated in steps, 4-25m high and 10-25m wide from the surface. Large machinery and vehicles can be used to efficiently excavate large deposits, but the terrain and geology must be suitable. Much of the copper and iron ore in the United States is extracted this way, and the Utah Copper Mine is particularly famous for this method. Source : Heibonsha Encyclopedia About MyPedia Information |
|
階段掘りとも。露天掘りの代表的な方法。剥土(はくど)後，地表から１段の高さ４〜25m，幅10〜25mの階段状に鉱床の採掘を進めるやり方。大型機械，大型車両が利用でき，大鉱床を能率的に採掘できるが，地形，地質などが適合していることが要件。米国の銅・鉄鉱石の多くはこの方法で採掘され，ユタ銅山が特に有名。
出典 株式会社平凡社百科事典マイペディアについて 情報 |
<<: "Ghost Story Saga Mansion"
![Shiojiri [city] - Shiojiri](/upload/images/67cbbafbc7e8c.webp)
Recommend
Public office - Lottery
… Public duties as taxes were originally imposed ...
svastika
…It is also written as Manji or Manji. In Sanskri...
Nakagawa
[1] [Noun] ① The river between the three rivers. ②...
Cain (English spelling) ayin (Hebrew)
The firstborn son of Adam and Eve, who appear in ...
Pika - Ezo nakiusagi
→ Pika Source : Heibonsha Encyclopedia About MyPed...
Atlantic palolo (English spelling) Atlanticpalolo
... Palola siciliensis , a member of the Euclidae...
Essential fatty acids - Hissushibosan
Fatty acids are necessary for the growth and norm...
Vaikuṇṭha (mountain) (English spelling)
It is the heaven of Vishnu, the preserving god of ...
Izunagaoka [town] - Izunagaoka
An old town on the west bank of the Kano River in ...
Zhen-la feng-tu-ji; Chên-la fêng-t`u-chi
A Chinese book about Cambodia (→ Zhenla). Zhou Dag...
Blue vine
Also called kamiebi. A deciduous woody vine of the...
Taininsetsu (English spelling) waiting theory
A theory of interest advocated by A. Marshall. Acc...
Asahi Lawsuit - Asahi Lawsuit
Shigeru Asahi (1913-1964), who was a resident of ...
price lining policy
...(1) includes (a) cost-plus pricing, which adds...
Absence
This is a typical type of epileptic seizure, also ...