The plant is designed to extract nickel from low-grade ores previously considered waste.

It is normally most profitable with low-grade ores.

It has long been an accepted axiom that these low-grade ores are repelled by the magnet.

The result is growing interest in the use of rock-eating bacteria to extract metals from low-grade ores, mining waste or industrial effluent.

He said spot zinc prices were already below the cost of production at mines that dig low-grade ores, forcing miners to seek lower processing fees.

Ozd now relies largely on turning low-grade ores from the Soviet Union into products it sells locally or ships back there.

• Installation of cyanide process for low-grade ores, Nipissing mine, Cobalt, Ontario.

They are able to promote corrosion of concrete, acidification of mine tailings, and bio-leaching of low-grade ores.

The Panel notes Shell’s concern with recoveries from low-grade ores and Shell’s commitment to research and development to improve the current estimated recoveries.

The salt extraction process is an electrolytic method which may be used to extract valuable metals from slag, low-grade ores, or other materials by using molten salts.

The Martha Mine eventually grew into one of the world's most important gold and silver mines, after industrial cyanide processes made recovering gold from the low-grade ores easier.

Tin miners in China have struggled with low-grade ores in past few years after decades of mining and a lack of new discoveries, reducing supply and supporting ore prices.

Cleveland-Cliffs sales are confined mostly to Canada and the United States after pulverising relatively low-grade ores into tiny pellets favoured by steel-makers in North America.

Dern was co-inventor of the Holt-Dern roaster, a furnace for carrying out the Holt-Christenson roasting process, a technique for recovering silver from low-grade ores.

These zones were estimated to contain 4 Gt of reserves and up to 60 Gt of potential resources, but exploiting such low-grade ores would require expensive beneficiation technology.

And more: tin, uranium, diamonds, coal, low-grade ores, all manner of base and precious metals, some, like molybdenum (a silver-white metal), that the two men had never even heard of.

Shell committed that it would continue research and development to improve the current estimated recoveries on low-grade ores and to provide the EUB with an update on its progress.

In ensuring years, high-grade ores became harder to find and harder to get to and more work was done on the processing of tailings for the low-grade ores it contained.

In October 1936 Göring learned that Stewarts & Lloyds foundry in Corby had successfully smelted low-grade ores; the new technology removed the barriers for Göring's plans.

The center's industrial focus expanded from biofilm control and mitigation to include positive use of biofilm processes to break up soil and water contaminants as well as extracting minerals from low-grade ores.

He decided, after mature deliberation, that the magnetic separation of low-grade ores on a colossal scale at a low cost was the only practical way of supplying the furnaceman with a high quality of iron ore.

They needed a device able to scan lumps of rocks and pick out those worth processing at a rate that would make it possible to work on the huge scale required to make extraction from low-grade ores economical.

In October, the company said it had hit low-grade ores at its vast Grasberg mine in Indonesia and would sell approximately 8 percent less copper in the fourth quarter and 62 percent less gold, with corresponding higher mining costs.

India initially imposed a duty of 300 rupees ($7.63) per tonne on all iron ore exports last February, but later cut the levy on low-grade ores below 62 percent iron content to 50 rupees after protests from the local mining industry.

The self-plundering eras of the Ninth and early Tenth Millennia had left the lodes of Urras empty; and as rocketry was perfected, it became cheaper to mine the Moon than to extract needed metals from low-grade ores or sea water.