There has also been a surprise drop in the fees charged by smelters and refiners to process dry feedstock, or copper concentrate as it is known, into anodes and eventually cathodes.

In the dry season, the animals tend to concentrate in the areas where there is water.

Other preparations for acidification the so-called dry or instant acids consist of pregelatinized flour blended with a sour dough concentrate or of cereal mash prefermented by lactic bacteria.