Located in the municipality of Cucurpe, in Sonora State, Mexico, Cerro Caliche is a group of concessions which contain eight historic gold mining sites. In January 2018, Sonoro Gold Corp. (“Sonoro” or the “Company”), through its wholly-owned Mexican subsidiary, Minera Mar De Plata, S.A. de C.V., entered into the first of five option agreements to acquire a 100% interest in the historical data, combined with results from Sonoro’s current exploration activities, totaling 23,000 meters of drilling, and more than 6,000 soil and rock samples, confirm the existence of a broadly mineralized low-sulphidation, epithermal vein system with continuing potential to develop a large tonnage resource suitable for open pit mining.

An NI 43-101 technical report estimated inferred mineral resource (at a 0.25 g/t gold equivalent cut-off grade) of 11.5M tonnes at an average grade of 0.495 g/t gold and 4.3 g/t silver that would be amenable to open pit extraction methods.” The technical report supports the Company’s plan to initiate production through the construction of a Heap Leach Mining Operation (“HLMO”) at Cerro Caliche. To advance the HLMO, the Company has entered into Memorandums of Understanding with three China-based EPC companies for the HLMO’s finance and development. Because there can be no assured date as to when COVID related restrictions will be lifted, Sonoro is also investigating an alternative plan to advance its proposed HLMO with Mexican technical expertise, with the intent of eliminating the impact of future COVID-19 related travel restrictions. Additional information on the alternative plan will be announced in due course.

Until Spring of this year Sonoro’s principle focus was the property’s shallow bulk tonnage potential in terms of both exploration and developing the HLMO. Results from drilling and field work has outlined a shallow oxide gold exploration target of between 75,000,000 to 100,000,000 tonnes with grades potentially between 0.3 g/t to 0.5 g/t AuEq., which is net after factoring in an assumed 70% gold recovery rate. It is important to emphasize that these potential tonnages and grades quantifying the exploration target are conceptual in nature and until enough drilling occurs, the existence, if at all, of a mineral resource cannot be assured. Also please note that the targeted bulk tonnage potential estimates are separate from the inferred mineral resources stated in the NI 43-101 technical report.

During late winter and early Spring 2020, an in-company analysis of the company’s entire geological data-set outlined Cerro Caliche’s elevated potential to host high-grade gold. i On May 26th, 2020 Sonoro released the Cerro Caliche Project Development Report which summarizes the study and its conclusions. As detailed in the report, an analysis of high grade chip samples taken by the Company, over an area of 4 kms by 3 kms, noted their near ubiquitous occurrence and elevation which is restricted principally to elevations between 1,100 meters above sea level (masl) to almost 1,700 masl. The high-grade samples ranged from 4 g/t to 25 g/t gold with a high of 95 g/t.

Based on the conclusions of the report and subsequent work to define specific drill targets, the 2020 High Grade (core) Drilling Program was planned. The Company has identified an initial 20 high-grade gold targets and an initial 6,000-meter core drill program to test them is currently underway. The campaign targets where veins and veinlets mapped at surface are projected to coalesce into one or two veins within the epithermal system’s ideal boiling zone.

The core campaign, together with reverse circulation (“RC”) drilling to test the property’s shallow bulk tonnage potential and the resumption of the HLMO scoping study commenced following the August 12th, 2020 completion of a CAD $8,000,000 equity financing, which included a fully subscribed 60% over allotment.


The Cerro Caliche gold project is strategically situated between two world-class mining districts of the Sierra Madre Gold Belt and the Sonora-Mojave Mega-shear. Located approximately 45 kilometers from the town of Magdalena de Kino in the mining district of Cucurpe, the property covers approximately 1,400 hectares and is surrounded by several gold-silver mining operations including the Magna Gold Corp’s San Francisco mine, Premier Gold’s Mercedes mine, Goldgroup’s Cerro Prieto mine and Agnico Eagle’s recently-acquired Santa Gertrudis project.


Mineralization types throughout the Cucurpe mining district include variants of epithermal low sulfidation veins and related mineralized dikes and associated volcanic domes. Local altered felsic dikes cut the mineralized meta-sedimentary rock units and may be associated with mineralization both in the dikes and meta-sedimentary rocks. The district has historically been regarded as vein dominated, but recently, open pit mining operations have been developed on disseminated and stockwork style gold mineralization.

Host rocks include Jurassic-Cretaceous meta-sedimentary rock units including argillite, shale, quartzite, limestone, quartz pebble conglomerate and andesite. Younger intrusive rock consisting of medium coarse-grained granodiorite-granite is present in the westerly parts of the concessions near the historic Cabeza Blanca mine. It is apparent that veining cuts and pervasively alters the intrusive stock. Rhyolite occurs in irregular bodies distributed in higher elevations in the northerly part of the concession, including the Rincón area, where it occurs as flows, sills, dikes and rhyolite domes. Part of the rhyolite is mineralized and appears to be related to epithermal gold mineralization throughout the property.

The nearby Mercedes mine complex area is interpreted to be part of the same hydrothermal event as the Cerro Caliche hydrothermal event as both are associated with development of extensional structural regional events in Tertiary age around 30 Ma to 35 Ma. Regionally, low temperature gold-silver fluids moved upward from a broad underlying area of emplaced calc-alkaline magma stock, through steep extensional (open) structures that tapped and channeled the fluids that deposited precious metals in quartz vein deposition sites in the Sierra Madre’s epithermal mineralized districts. The “boiling phase” changes kinetics within 1,000 meters of the paleosurface (the surface as it existed during the Tertiary) and defines the zones of deposition for the precious and base metals within the veins.




Sonoro Gold’s exploration conducted in the project area has defined a near surface resource posted to SEDAR which is a maiden resource which both initiates the Company’s program to quantify large areas of mineralized material that could support a conceptual Heap Leach Mining Operation. Continuation of drilling is projected to extend the mineralization in structural zones along trend and near surface. This completed work, combined with the completion of a working mineralization model, has developed excellent targets for high grade gold veins.

The goal of future exploration at Cerro Caliche is to increase the size of the numerous precious metal mineralized zones by focusing on three different mineralization formats:

    1. Extension of known zones of gold mineralization along trend of the vein zones outlined with drilling to the northwest and to the southeast together with new high grade gold targets;
    2. Targeting of porous geologic units including volcanic basal units of rhyolite flows; and,
    3. Newer untested but surface defined gold mineralized zones where 16 zones remain to be tested.

Future phases of drilling totaling approximately 50,000 meters planned for 2020-21 are designed to test the exploration target of between 75,000,000 to 100,000,000 tonnes with grades potentially between 0.3 g/t to 0.5 g/t AuEqR, assuming AuEqR = (Au g/t × 0.72) + (Ag g/t × 0.01133 × 0.30). The potential tonnages and grades set forth in the analysis of geological potential are conceptual in nature, as there has been insufficient exploration to define a mineral resource and it is uncertain if further exploration will result in the target being delineated as a mineral resource. Potential estimates are separate from the inferred mineral resources stated above.

Drilling will target both infill in zones that were previously drilled as well as a large number of holes to test undrilled portions of the various mineralized trends along strike and at depth.


These Longitudinal and Cross Sections have been created based on the drilling results as can be found in the previous section of this page.


Click to enlarge the specific areas below:





The core drilling program commenced in early September 2020 (the “Drilling Plan”) and will total 6,000 meters of core drilling to test 20 targets, of which the initial 11 holes have been identified in the Drilling Plan. Of the remaining nine holes, seven have been tentatively identified in the Drilling Plan and two are reserved depending on the results of prior holes. This initial core drilling program is the first segment of the proposed 50,000 meters of core and rotary drilling contemplated in the Company’s May 26, 2020 news release.

The main purpose of the 2020 core drilling program is to test for the presence of high-grade type gold mineralization as outlined in the PDR. The PDR, which delineated the potential for higher grade gold zones in the epithermal system, was disseminated to the public by the Company on May 25th, 2020 and is available here.

As illustrated in the Drilling Plan, the proposed 6,000 meters of core drilling will target mineralized zones projected to support vein zone coalescences at elevations favorable for the deposition of high-grade gold. Drilling will test the confluence of parallel striking gold bearing vein zones that, at surface, are expressed as gold enriched sheeted vein sets. It will also similarly test at depth, the area’s coalescing of gold enriched stockwork zones. An additional focus is on areas where the rock type changes from quartzite to Cretaceous andesite host rock.


The deep potential targeted by Sonoro will test for similarities to the neighboring Mercedes mine, 9 km to the southeast. The Mercedes mine operates mainly underground with mining supplying a 2,000 tonnes per day mill that has operated since 2011 (Premier Gold website). The Mercedes mine is located in the same mineralized epithermal district and related hydrothermal – igneous system that hosts the Cerro Caliche mineralized area. Average mine-mill grades at the Mercedes mine have ranged between 2.59 and 6 grams/tonne gold with up to 100 grams/tonne silver. While encouraging because Cerro Caliche shares similarities with the geology at the Mercedes mine site, there can be no assurance that high grade gold zones similar to those at Mercedes will be discovered at Cerro Caliche.


All scientific or technical information contained on this website has been reviewed and approved by Stephen Kenwood, P.Geo., a Director of Sonoro Metals Corp., who is a “Qualified Person” as defined in National Instrument 43-101 of the Canadian Securities Administrators.




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