Silver: Los Campos

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project overview

The Los Campos project is situated in the world class Mexican Silver belt in Zacatecas state, the largest silver producing state of Mexico. The project hosts a series of historic underground silver mines that targeted at least 2 main high grade epithermal silver veins. There are a series of historic narrow open stopes at surface that follow the mineralised vein systems, a couple of adits driven into the side of the hill as well as several deep vertical shafts for underground access.

The project hosts high grade epithermal silver veins which were mined between about 1883 to 1904 with a reported average mine head grade of over 1,000 g/t Ag (14g/t Au Equivalent). The majority of the historic mining appears to have focused on the Los Campos vein.

The company is continuing to find detail of the size, shape and scale of the historic workings. Dump and ore material from several shaft and old workings are still present at surface and the 2 main vein systems can be traced at surface for over 1500m.

ProjectLos Campos
LocationZacatecas, Mexico
Deposit StyleEpithermal
Key AttributesHigh grade epithermal silver
Asset StageResource definition
Results500+ g/t Ag from surface sampling
Next Phase of WorkUnderground mapping and drilling
Deal PartnerAvailable
Deal TermsTBC

Surface mapping and sampling work carried out by Alien has confirmed that there is high-grade silver-gold mineralisation at Los Campos, 14 of the 50 samples taken in 2019 were anomalous for silver returning an average of 185 g/t Ag, ranging from 43.6 g/t to 547 g/t Ag. 10 of these samples were from dumps around the shafts and confirm the high grade of the target veins mined historically and the fact that there remains high grade ore in the old workings as well.

The San Rafael vein has been mined outside of the project area by several significant stopes and shafts. However, within the property, there appears to have been no mining conducted on this vein. The San Rafael vein is the causative body to the large Kaolin quarry along with multiple splay structures suggesting that additional high-grade structures will be found in this area of the property. It should be noted that often historic mining focused on the main vein(s) with minimal exploration on splay structures and of course the most accessible parts as majority of the mining was by hand.

With modern local mining methods favouring decline development for underground mining and the topography of the tenement in relation to the mineralisation, its apparent that access to the historic workings and potential further development of this project could be done by driving one or more declines into the system from the lower slopes of the structure straight into the system.


An attempt will be made by the Alien technical team to access the old underground workings where possible safely. Should excessive water be present then an option to attempt to dewater the higher levels will be reviewed. Access will enable sampling and mapping of the mineralised units to add important knowledge of the historic workings extent and location as well as up to date information on the potential grade and width of the mineralisation in the existing workings.

Location of the adits will also be done as gaining access via these adits would prove easier than via the vertical shafts and also add information to possible future mine planning options.

Alien are also in the process of getting environmental permits granted to begin a diamond core drilling program as well. The larger drill plan as per figure X is designed to be able to define an MRE in the future however early drilling will focus on proving up the existing core mineralised systems as well as the strike and depth extensions.

Key Highlights

3km from endeavour el compAS SILVER MINE. Los Campos INCLUDES:

Grade Samples

SampleAu (g/t)Ag (g/t)Ag (oz/t)

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