542 Report on the Composition of 



4. Guano deposit of Pabillon de Pica, Cueva del Piincouada, taken on 

 surface over deposit of probably more than 100 feet. 



5. Guano deposit of Pabillon de Pica, Cueva del Einconada, taken from 

 about 50 feet lower than No. 4. 



PUNTA I)E LOBOS GUANO. 



1. Guano deposit of Punta de Lobos, taken at 5 feet below the surface, 

 above boring of 20 feet. 



2. Guano deposit of Punta de Lobos, taken at 40 feet below the surface. 



3. Guano deposit of Punta de Lobos, taken at 8 feet below the surface. 



HUAMILLOS GXJAKO DEPOSITS. 



1. Guano deposit of Huanillos, taken at 5 feet below the surface. 



2. Guano deposit of Huanillos, taken at 10 feet below the surface. 



3. Guano deposit of Huanillos, taken at 19 feet below the surface. 



4. Guano deposit of Huanillos, taken at 13 feet below the surface. 



5. Guano deposit of Huanillos, taken at 40 feet below the surface. 



According to a report given by Mr. Thierry, C.E., the 

 estimated quantity of these deposits, which lie to the south of 

 Iquique, are : — 



Tons. 



Huanillos 700,000 



Punta de Lobos 1,601,000 



Pabillon de Pica 5,000,000 



7,301,000 



These are the chief deposits recently surveyed, and, according 

 to Mr. Thierry, the additional minor guano deposits bring up the 

 estimated total amount to 7,680,500 tons ; so that there are only 

 379,500 tons more than the estimated quantity in the three large 

 deposits from which I received samples for analysis. 



Pabillon de Pica Guano. 



Tlie folloioinq is the Composition of the Five Samples labelled as above : — 



Moisture 



*Orgaruc matter and salts oi) 

 ammonia / 



Phosphates of lime 



t Alkaline salts 



Insoluble siliceous matter (sand) 



•Containing nitrogen 



Equal to ammonia 



f Containing phosphoric acid 



Klqual to tribasic phosphate of lime . . 



Total phosphoric acid 



No. 1. 



3-20 



46-17 



25-51 



15-49 



9-63 



100-00 



9-81 

 11-91 

 1-81 

 3-95 

 13-49 



No. 2. 



5-45 



49-40 



27-01 



15-99 



2-15 



100-00 



9-15 



1111 



1-70 



3-71 



U-06 



No. 3. 



4-13 



59-01 



21-82 

 9-00 

 6-04 



100-00 



15-08 

 18-31 



3-66 

 11-67 



No. 4. 



9-23 



41-32 



23-80 



23-30 



2-35 



100-00 



No. 5. 



6-70 



55-10 



24-55 



12-10 



1-55 



100-00 



11-02 

 13-38 

 3-48 

 7-59 

 14-72 



