Search |
|---|
Statistics |
|---|
Онлайн всего: 1 Гостей: 1 Пользователей: 0 |
| Main » Articles » MENU |
| Entries in category: 18 Shown entries: 11-18 |
Pages: « 1 2 |
|
The Bagger 288 is a bucket-wheel excavator used in strip mining. It is also the largest land vehicle of all time. |
|
Mining techniques can be divided into two common excavation types: surface mining and sub-surface (underground) mining. |
|
Schematic of a cut and fill mining operation in hard rock. |
|
There are ancient, prehistoric copper mines along Lake Superior, and metallic copper was still found there, near the surface, in colonial times. |
|
Mining as an industry underwent dramatic changes in medieval Europe. |
|
Mining in Europe has a very long history, examples including the silver mines of Laurium, which helped support the Greek city state of Athens. |
|
Ancient Egyptians mined malachite at Maadi. |
|
Since the beginning of civilization, people have used stone, ceramics and, later, metals found on or close to the Earth's surface. |