Copper and silver, Professor Pittier says, have been discovered in Diquis, between Paso Real and Lagarto, and native copper in Puriscal. Other mines are included in the following table:
The Principal Mines Registered in 1892.
| Name of Mine. | Canton. | Location. | Product. | |
|---|---|---|---|---|
| La Trinidad | Esparza | Rio Ciruelitas | Gold and silver ores. | |
| La Union | Puntarenas | Shores of Rio Seco | ” | ” |
| Sacrafamilia | Alajuela | Monte de Aguacate | ” | ” |
| La Minita | ” | ” ” | ” | ” |
| Mina de los Castros | ” | Corralillo | ” | ” |
| San Rafael | ” | ” | ” | ” |
| Mina de los Oreamuno | ” | ” | ” | ” |
| Quebrada Honda | ” | Quebrada Honda | ” | ” |
| Machuca | ” | Corralillo | ” | ” |
| Trinidad de Aguacate | ” | ” | ” | ” |
| Peña Grande | San Ramon | Cerro de San Ramon | ” | ” |
| Mina de Acosta | ” | Shores of Rio Jesus | ” | ” |
| Palmares | ” | Cordillera de Aguacate | Gold, silver and lead ores. | |
| Las Concavas | Cartago | Rio de Agua Caliente | Copper ore. | |
| Mancuerna | Sardinal | Sardinal | ” | |
| Mata Palo | ” | ” | ” | |
| Puerta de Palacio | ” | ” | ” | |
| Hoja Chiques | ” | ” | ” | |
| Chapernal | ” | ” | ” | |
It should be stated that, with the exception of gold and some silver, little is mined. The deposits of coal, petroleum, copper and silver have thus far yielded, under present methods of management, outputs of no commercial value.
However, anthracite is found at Santa Maria Dota, Department of Puriscal. A specimen of it, analyzed by Dr. L. J. Mátos, chief of the laboratories of the Philadelphia Commercial Museum, gave these results:
It is a good quality of anthracite coal and compares very favorably with the best grades that are mined in Pennsylvania. Color, black; slight tendency to show iridescence; fracture, conchoidal, brittle; analysis, specific gravity, 1,343; weight per cubic foot, 83.93 pounds.
Proximate composition:
| Moisture | 2.60 | per cent. |
| Volatile matter | 3.56 | ” |
| Fixed carbon | 88.20 | ” |
| Ash | 5.64 | ” |
| Total | 100 | ” |
| Sulphur | .4319 | ” |
| Coke | 93.84 | ” |
| Coke per ton of coal | 2002.01 | pounds. |
| Fuel value | 9.14 | ” |
| Fuel ratio | 1 : 24.77 |
There are to be mentioned also some mineral waters, as, for instance, those near the mouth of the Isqui River, on the Talamanca coast; those in Agua Caliente, about five miles from the City of Cartago and belonging to the Bella Vista Company; those of Orosi and Salitral, of Poas, Miravalles, Ausoles, Bagaces, San Carlos, Liberia, San Roque, etc.