ECONOMIC GEOLOGY. 237 



HISTORY. 



Copper has been known in this district for a long time. Probably the 

 first work on copper ore was done by Colonel Heneken, who prospected at a 

 number of places from 1847 to 1863 but apparently shipped only a few 

 samples. Francis Chini prospected here from 1890 to 1912, but he also 

 appears to have found no large quantity of ore. The San Francisco min- 

 ing concession, which covers the district, was granted, on April 10, 1900, 

 to Mr. Diaz, who transferred it to Mr. E. A. Blanton, representing the Santo 

 Domingo Exploration Co., on August 23, 1902. Captain Adams is reported 

 to have built the houses at Naranja Dulce and to have done some pros- 

 pecting, principally in the old Heneken and Chini workings, in 1900 to 

 1902. The Santo Domingo Exploration Co. lost the concession by forced 

 sale, and it was bought by Mr, A. R. Justice, an associate of Mr. Blanton, 

 on March 30, 1909. Mr. Justice transferred the concession to the San 

 Cristobal Mining Co., notifying the Government of the transfer on 

 August 6, 1909. On November 17, 1910, the concession came within the 

 terms of the mining law by virtue of a request of the company. By private 

 agreement the Blanton Copper Mining Syndicate obtained permission 

 from the San Cristobal Mining Co., on August 7, 1912, to exploit that part 

 of the claim which is known as the Biicaro. The San Cristobal company 

 operated on Biicaro Hill until September, 1917. The entire concession 

 was cancelled on March 3, 1919, because of failure to do development work, 

 and immediately after that date Dr. Jacob Harootian filed application for 

 three concessions covering approximately the area of the old San Francisco 

 concession, or a large part of it, and also for an exploration right in this 

 district for 6 months. The concessions for which he has applied are (1) 

 Dos Marias, 120 hectares, (2) Camden First, 120 hectares, (3) Camden 

 Second, 200 hectares. He has taken up his residence at Naranja Dulce and 

 has been actively engaged in prospecting for the last 3 months. 



The above statements are based on reports on file in the office of the 

 Departamento de Fomento supplemented by information furnished by 

 several persons, principally Doctor Harootian and his brother-in-law 

 Mr. J. P. McCulloch. 



DEVELOPMENT. 



Most of the workings were caved and entirely inacessible at the time of 

 the examination, so that it is impossible to give any accurate statement of 

 the development. Several shallow shafts were sunk at different places. 



On Biicaro Hill there are a number of tunnels, some of which are reported 

 to have been 100 meters or more long. Five tunnels on this hill were 

 visited during the examination but only two could be entered, and there 

 was no stopping in these. 



The following table, compiled from records in the office at Naranja 

 Dulce, shows that 1,061 short tons of ore were shipped in 18 different lots 



