Sentence examples for open pit methods from inspiring English sources

Mining began in the 1880s with open pit methods, initially of carbonate ore, which later changed to underground mining of sulfide ore.

Open-pit methods have been used in Australia and Canada, while underground mining is generally necessary for other mines in the world.

In the 1950s exploitation of the extensive iron-ore deposits, known as the Kursk Magnetic Anomaly, was begun near Zhelezogorsk and developed very rapidly; much is mined by open-pit methods.

Three areas are of special importance: the taconite hematite ores of Mesabi and Ungava, mined with relative ease by opencast, or open-pit, methods; the nickel deposit of Sudbury, Ontario, once the largest such deposit in the world; and the large copper and gold bodies associated with the greenstone intrusions in northern Ontario and Quebec.

(d) There is no practicable alternative to the deep open-pit method of mining the coal.

For lower-grade deposits located near the surface, the open-pit method is the most practical for the mining of large tonnages of material.

Because of the altered and decomposed nature of overburden and ore materials, the Brazilian deposits are mined by the open-pit method.

With 20% recoverable through open pit mining methods, this extraction process produces a considerable amount of fluid fine tailings (FFT) waste material, which must be deposited on site in tailings ponds.

Open pit mining method is used to extract copper ore in the Sarcheshmeh mine.

This paper proposes a real option model for valuing open pit mines with two processing methods under commodity price uncertainty.

The difficulty is that metals are mined in different methods such as open pit and pit mining, different forms such as oxide ore or sulfide ore, and smelted with different processes such as hydro- and/or pyro-metallurgy.