SECOND ANNUAL REPORT—MINERAL INDUSTRIES. 
241 
sand, clay and other constituents of the matrix. The amount of phos¬ 
phate thus discarded may be expected to vary with different deposits 
and under different conditions. After reaching the dump there is 
also more or less mechanical separation, so that samples taken from 
one part of a dump may be found much richer in phosphate than from 
some other part of the same dump. Samples taken somewhat at ran¬ 
dom from the phosphate dumps in the hard rock region gave the fol¬ 
lowing: No. 1 is from mine No. 5, of the Cummer Lumber Company, 
Newberry, Fla. No. 2 is from Camp Phosphate Mining Co., five miles 
southeast of Dunnellon, Fla. Analyses in the office of the State Chemist. 
No. 1. No. 2. 
Total phosphoric acid (P 2 0 5 ) ... 9.99 12.14 
Equivalent to tricalcium phosphate.. 21.81 26.50 
A sample of floats from the dump in the land pebble section gave 
the following analysis. This sample was taken from the dump of the 
Charleston Mining and Manufacturing Company at Fort Meade, Fla. 
Analysis in the office of the State Chemist. 
Total phosphoric acid . 11.47 
Equivalent to tricalcium phosphate . 25.04 
Analyses made by Mr. P. Jumeau, manager of the plant, of two 
samples from the wash of the plate rock phosphate mine operating at 
Anthony, Fla., gave the following results S 
No. l. No. 2. 
Silica . 58.95 60.10 
Iron and alumina . 11.70 11.20 
Calcium phosphate '.. 27.92 26.80 
Not accounted for . 1.43 1.90 
Mr. Jumeau estimates that in this plant approximately four tons 
of matrix is handled in order to obtain one ton of high grade rock 
phosphate (77 per cent). In other words of the material taken from 
the pit three-fourths carrying about 27 per cent calcium phosphate 
goes into the dump, while one-fourth carrying 77 per cent calcium 
phosphate is saved. It is thus seen that of the total phosphate taken 
from the pit in this instance fully one-half goes into the dump. 
From these analyses it is apparent that a very large amount of 
Florida phosphate is being lost annually. Methods of reclaiming this 
waste or of utilizing the floats, if such can be devised, are clearly of 
the greatest importance to the phosphate industry, and ultimately to 
the agricultural interests of the country. 
1 Composition des Gisements de Phosphate de Chaux des Etats-Unis, P. 
Jumeau, Paris, 1906. 
