project images - clemente

Thor Copper Project

  • Commodity:
  • Location:
  • Size:
  • Status:
  • Copper and Gold
  • Sonora, Mexico
  • 128 km²
  • Optioned to Earn 100%
  • Exploration Update
  • Property Details
  • Diagrams
  • Photo Gallery



The Thor Copper Project is located within the Arizona - Sonora Copper Mining Belt, which is host to over 40 major Cu-Mo porphyry deposits, including in Mexico the world-class, Cananea and La Caridad copper mines currently being operated by Grupo Mexico. The Thor property was acquired for its extensive color and associated geochemical anomalies, interpreted by Riverside to represent the basal portions of an eroded porphyry-related lithocap making it the prime target for a new significant copper discovery. This part of Sonora is rich in copper potential and has had extensional tectonics that provide a potential for shallow, open pit discoveries under pediment that could possibly be unrecognized due to post-mineral faulting as Riverside’s President, John-Mark Staude, described in his 1995 PhD doctorate thesis on the mineralization in Sonora, Mexico.

The 128 sq km Thor Project is located 130 km SW of the La Caridad Mine (1,800 Mt @ 0.45% Cu, 0.02% Mo) and has good access via paved highways from the city of Hermosillo and the nearby town of Ures, Sonora. An electrical power-line and a source of water are nearby. Riverside has developed positive working relationships with the local community and ranchers that has facilitated our exploration activities on the property. 

Riverside controls 100% of the Thor mineral concession and has completed an initial four hole drill program into one of the six target areas with funding from Antofagasta Minerals. The results from this initial 1,400 metre diamond core drilling program were positive for finding a porphyry system and now point toward further target testing and follow up of other targets. Drill cores and all other exploration data generated to date, including Aster image analysis, ground magnetics surveying, petrographic and geochronology studies are available for review by interested parties. Riverside has already used this information to outline six targets which warrant further exploration, including drilling.   

thor fig1Figure 1. Regional map showing location of the Thor property, Sonora, Mexico

thor fig2S
Figure 2. Thor Project geology map showing alteration zones and target areas 

thor fig3
Figure 3. Cross-section through North Target showing interpreted geology (refer to Figure 2 for location of section). Section depicts a porphyry-related, zoned alteration system that has been tilted to the west. The copper deposit target is represented by the potassic alteration zone that potentially exists hundreds of metres east of 2017 drill-holes.  

thor fig4
Figure 4. Undrilled porphyry copper - drill ready target



The Thor project is located at the southern end of the Aconchi Batholith Complex, which is composed of several intrusive phases of both Laramide (65 to 55 Ma) and post-Laramide (42-36 Ma) ages. About 15 km to the southwest is the Mazatan Metamorphic Core Complex, comprising Paleozoic and older rocks that display ductile and brittle-ductile structural features similar to those found in the Catalina Core Complex, located north of Tucson, Arizona around a cluster of copper mines in Arizona. The Mazatan Core Complex was formed approximately at the same time as the Basin and Range extensional geomorpho-tectonic province of Southwestern U.S.A. and Northwestern Mexico. Pronounced tilting of structural blocks and rotation of normal faults are a characteristic feature of the Basin and Range province and have been observed on the Thor property. Recognition of such structural features has enabled Riverside geologists to define high-potential copper porphyry targets that are ready for drilling.   

thor img1
Image 1.
Quartz eye rhyolite porphyry from Thor project with sericitic alteration typical of upper lateral levels of a porphyry system. Red hematite and jarosite iron oxides from weathering of sulfides and hydrothermally destroyed mafic minerals. 

In the project area the central portion of the Aconchi batholith complex has been affected by extensional faults that have formed a NNW-oriented, 15 km long by 1.5 to 3.5 km wide graben structure. Upper Cretaceous-Paleocene felsic and intermediate volcanic rocks along with Paleozoic carbonate and siliciclastic sedimentary rocks exist within the limits of the graben. The volcanic rocks occur in the northern part of the down-faulted block, while the older sedimentary rocks are exposed more in the south where deeper erosion has occurred. Both rock sequences have stratigraphic equivalents that host porphyry copper deposits elsewhere in the Arizona-Sonora mineral province. The geology and working environment are positive for making a near term mineral discovery at Thor.

thor img2
Figure 5. Schematic geochemical and alteration features for an idealized porphyry copper system by Scott Halley. At Thor Riverside sees features indicative of the upper zones of this schematic model.


The scientific and technical data pertaining to the Thor Project was reviewed and approved by Ron Burk, P. Eng., a non-independent qualified person to Riverside Resources, who is responsible for ensuring that the geologic information provided in this news release is accurate and who acts as a “qualified person” under National Instrument 43-101 Standards of Disclosure for Mineral Projects.

Riverside Owned Projects

Cecilia Gold Project


Riverside has acquired the option to earn 100% of two large mining concessions, creating the consolidated Cecilia gold project. The project’s concessions were previously owned by Gunpoint and Millrock Resources. The project is a low-sulphidation epithermal gold-silver project and has seen significant exploration including drilling by past owners.

learn more button


project images - penoles

The Peñoles Property is a 142 square km concession located in the Penoles Mining District, Durango, Mexico. Recent drilling highlights include 33 m of 1.7 g/t gold.

learn more button

Tajitos Gold Project

project images - cajon gold project

The 61 km² Tajitos Gold Project is located in the heart of the Sonora-Mojave Megashear Gold Belt. The Project was acquired by Riverside from a private owner and is owned 100% with no underlying royalties. Since acquiring the property, Riverside has completed multiple surface and underground sampling and mapping programs and has staked additional ground (Tejo & Cortez claims) to expand the land package. Initial exploration with Centerra is expected to include further geophysics and trenching followed by a 2nd phase with drilling.

learn more button

Thor Copper Project

Thor-header image

The 128 km² Thor Project (the “Project”) was acquired as part of Riverside’s strategic alliance with Antofagasta Minerals PLC for generative exploration throughout the southern extension of the Laramide Copper Belt in Northwest, Mexico. Thor was nominated as a Designated Project (“DP”) (see press release April 13, 2015), and as per the agreement, Riverside’s alliance partner will have the opportunity to earn a 65% interest in the project by spending $5,000,000 in exploration over the next four years.

learn more button

Ariel Copper-Gold Project


The Ariel Project is strategically located 30 km ESE of the world-class La Caridad Cu-Mo porphyry mine (1,800 Mt @ 0.45% Cu, 0.02% Mo), and 24 km SE of the Los Alisos Cu porphyry prospect.

learn more button