DOROSA is a Mexican company established in 1999 as a Variable Capital Stock Company. Its mining project covers four concessions located in the Sierra Madre, within the Mexican Epithermal Province, in the Sultepec Mining District, State of Mexico, totaling 1,980 hectares.
The García family, owner of Compañía Minera DOROSA since 1995, has played a key role in the development of the project, providing roads, water and electricity, and supporting studies and exploration. It is important to mention that the García family are the only legitimate owners of the DOROSA mine concessions, having all the documentation for their accreditation. DOROSA's four mining concessions are located south of Tejupilco, southwest of the town of Sultepec in the State of Mexico; These concessions total almost 2,000 hectares.
The project's infrastructure is notable, with 6-lane highways starting from Mexico City. There is also the availability of electricity and water.
In addition, it is supported by geological and reserve studies, as well as extensive historical experience in the area. The project is located in the physiographic province of the Neovolcanic Axis, with rocks of various ages, and six mineralized veins have been identified, Belem and Belem 2 being the most relevant.
The deposit presents a structure of parallel veins with a NW orientation 40° to 70° SE and an inclination of 45° to 70° to the NE. The Belem vein, the most significant, has a thrust of 1,200m and an average thickness of 1.20m. The Belem 2 vein is the second most important. Drilling and reserve estimates have been carried out, but there remains a large area to explore.
The project has accessible mining works in good condition, highlighting a 60m long work in the Belem vein.
The mineralization includes gold and silver, with the presence of other minerals of lower value. A close relationship is observed between the location of the mineral bodies and hydrothermal alterations.
The company has carried out metallurgical tests, obtaining a recovery of 93%. The Sultepec region is characterized by hydrothermal veins in Mesozoic Vulcanosedimentary rocks.
6 drill holes were made with a separation of 100 m. between each one, and the depth at which it was cut was on average 50 m. Once the areas were delimited, the conventional method was used to delimit mineral blocks into bodies.
The probable reserves found in the Belem and Belem 2 veins were indicated with diamond drilling, in some cases supported by surface sampling in vein outcrops and in others with mine interior sampling.
Currently, the DOROSA project has an estimate of reserves calculated based on the diamond drilling carried out. According to the information taken from the drill cores, the following reserve data were obtained:
It is important to note to the reader that only a very small portion of the Project was drilled, so there remains a large number of hectares to explore in the future.