Baltimore Paper - Phosphate Chemistry as it Concerns the Miner

Every one engaged in the mining of phosphates is well aware that the price he gets for his product depends upon tile results of chemical analysis. He knows that the value rises with the percentage of phosphoric acid, whether stated as such or as so-called " bone phosphate," and that deductions are made for certain constituents, such as alumina or oxide of iron, when the amount of these exceeds certain limits. The reason for these deductions is but vaguely understood by many, and there are few who possess the special knowledge required to form a competent judgment, either as to the reli-