At present prices, marginal deposits become viable mines and supply increases markedly.

Supply in natural resources markets was already slowing as companies had to turn to more marginal deposits, with the extra costs those entail.

The bank lifted the marginal deposit rate on foreign-currency bank accounts to 45 percent from 40 percent.

They occur as isolated patches within the shelf and basin limestones or as a marginal deposit between the two.

It also cut deposit requirements on all loans made from overseas, and the marginal deposit requirement on accounts held in Peru's sol.

Saskatchewan – Encourage deep mining exploration technologies – Innovative processing technologies (for marginal deposits)

The conventional wisdom is that average grades fall during good times, because high prices make marginal deposits profitable, and then rise again in weaker markets, as lower-quality mines are idled.

Instead of raiding licensed properties, the miners have signed an agreement with a local mining firm, the Mundulaan Trade Company, to mine marginal deposits that big firms cannot handle.

Thiobacillus ferrooxidans on pyrite - CSIRO's research into bacterial processing may mean that marginal deposits, tailings and refractory ores become profitable resources.

LATECOMERS Chinese firms were latecomers in investing overseas, and high metals prices often limited them to the more risky, more marginal deposits.

And you can argue that the prices of non-renewable resources will be forced upwards over time as reserves are depleted and the cost of extraction rises as producers are pushed towards more marginal deposits.

If prices remained high for a number of years it would become economic to develop marginal deposits in other parts of the world, such as Indonesia, New Guinea, New Caledonia, Peru and the US.

It said the marginal deposit rate on foreign-currency bank accounts would rise to 40 percent from 30 percent and the marginal deposit rate on accounts denominated in Soles would be 15 percent.

Starting in August, the central bank said the minimum deposit requirement for bank accounts will rise to 9 percent from 8.5 percent, and the marginal deposit rate on dollar accounts will rise to 49 percent from 45 percent.

In a statement after its meeting, the central bank said it raised the minimum legal deposit rate on bank accounts to 8.5 percent from 8 percent, and the marginal deposit rate for bank accounts denominated in the Peruvian currency to 25 percent from 20 percent.