Search results
Results from the WOW.Com Content Network
This list of mines in Portugal is subsidiary to the list of mines article and lists working, defunct and future mines in the country and is organised by the primary mineral output. For practical purposes stone, marble and other quarries may be included in this list.
Tungsten. body-centered cubic (bcc) (cI2) Tungsten (also called wolfram) [11][12] is a chemical element; it has symbol W and atomic number 74. It is a rare metal found naturally on Earth almost exclusively as compounds with other elements.
This page was last edited on 23 September 2014, at 21:13 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike License 4.0; additional terms may apply.
Mining Concession C-18 Panasqueira. Minas da Panasqueira or Mina da Panasqueira (English: 'Panasqueira mine') is the generic name for a set of mining operations between Cabeço do Pião (Fundão municipality) and the village of Panasqueira (Covilhã municipality), which has operated in a technically integrated and continuous manner practically since the discovery of ore there.
The mine is presently active in levels 1, 2 and 3. It extracts between 700,000 and 800,000 t of ore per year and produces between 100 and 120 t of tungsten concentrates per month and other byproducts. Tin is increasing in importance as exploitation zones progresses towards mixed tungsten-tin vein zones.
Early tin exploitation appears to have been centered on placer deposits of cassiterite. [3] Map of Europe based on Strabo's geography, showing the Cassiterides just off the northwest tip of Iberia where Herodotus believed tin originated in 450 BC. The first evidence of tin use for making bronze appears in the Near East and the Balkans around ...
Mining in Portugal is regulated by the Portuguese Ministry of Economy and the Geology and Energy Resources authority under the state-run research institute INETI. Mining activities have continued since the pre- Roman era, when most of the region was known as Lusitania. Gold was once mined. The country remains among the largest European ...
Tin is an essential metal in the creation of tin- bronzes, and its acquisition was an important part of ancient cultures from the Bronze Age onward. Its use began in the Middle East and the Balkans around 3000 BC. Tin is a relatively rare element in the Earth's crust, with about two parts per million (ppm), compared to iron with 50,000 ppm ...