The Peñoles Gold-Silver Project

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Gold, Silver
Durango, Mexico
22.9 km²

The Peñoles Project includes an oxide gold prospect (referred to as El Capitan) and two historic silver mines (Jesus Maria and San Rafael) located in the historic Peñoles Mining District of Durango, Mexico. The Peñoles Project is host to multiple mineralized vein systems, fault zone structures, poly-metallic skarns, and silicified low-temperature gold-rich volcaniclastics. Approximately 86 diamond drill holes totalling more than 11,550 metres have now been completed at the Project. Drilling to date on the Peñoles property has defined wide intervals of near-surface gold mineralization (with low silver values) at El Capitan that could potentially be amenable to open-pit extraction methods and significant intervals of near-surface silver mineralization (with associated gold, lead and zinc values) at Jesus Maria zone.

According to published historic records, Minera Industrias Peñoles was incorporated in 1887 to operate the Jesus Maria and San Rafael silver mines and took its name from the local community of Peñoles. The full extent of the historic mine workings is unknown, but mining appears to have been selective and limited to within approximately 100 metres from the surface. The only modern exploration work that was completed on the property prior to 2011 consisted of a four-hole drill program completed by Aurcana Corporation (“Aurcana”) in 2004, and surface mapping, sampling, a limited IP survey, and a five-hole drill program completed by Riverside in 2008 and 2009. The drill holes completed by Aurcana and Riverside returned encouraging results and showed that El Capitan had potential to host a bulk-tonnage, low-grade gold deposit. Preliminary metallurgical tests completed by Sierra Madre in 2011 using Riverside drill core indicated that the gold mineralization at El Capitan could likely be recovered using cyanide leaching. Since March 2011, exploration work and drilling funded by Riverside’s partner has primarily focused on the El Capitan Gold Zone and the Jesus Maria Silver Zone.

The Peñoles project has an established (305k oz Au at 0.46 g/t & 15M oz Ag at 62 g/t Ag) inferred resource (see NI 43-101 report below), which remains open in multiple directions and at depth.  Previous work includes drilling, underground sampling and trenching at the El Capitan gold zone and the historic Jesus Maria silver mine discovered high-grade Ag

El Capitan Gold Zone

  • DH 12-13: 124.3m at 0.61 g/t Au
  • DH 11-03: 105.25m at 0.58 g/t Au

Jesus Maria Zone (Silver & Gold)

  • JM DDH 12-10: 4.25m at 732.24 g/t Ag & 1.2 g/t Au
  • JM DDH 14-24: 41.95m at 227.24 g/t Ag including 7.15m at 988.4 g/t Ag & 1.24 g/t Au
  • JM DDH 14-27: 18.7m at 203.92 g/t Ag & 0.65 g/t Au

The Peñoles property lies in the Altiplano Sub province of the Sierra Madre Occidental (SMO). The SMO is a regionally extensive Eocene to Miocene volcanic field that extends from the US-Mexican border into Central Mexico. The Altiplano sub province is on the eastern flank of the SMO and comprises Jurassic to late Tertiary sedimentary and volcanic rocks (Sedlock et al., 1993). This district hosts extensive hydrothermal-related silver, gold and base-metal deposits and is generally referred to as the Faja de Plata, or Mexican Silver Belt.

The El Capitan deposit, the Jesus Maria deposit, and the San Rafael-El Tubo prospects of the Peñoles Project are located on the concessions owned by Riverside and they appear to be related to intersections between the northwest-striking and northeast-striking regional structures. These occurrences are also localized along the southern margins of a northeast-oriented magnetic anomaly identified from government airborne surveys.

NI 43-101 Technical Report

During the 2011 and 2012 campaign at El Capitan drilling encountered numerous intervals of gold mineralization ranging from 50 m to 140 m in length. Mineralization appears localized along the unconformity between Tertiary-age volcaniclastic rocks and Cretaceous-age sediments. The upper part of the mineralized zone consists of porous, volcanic agglomerate cut by narrow quartz veinlets and hydrothermal breccias (averaging 0.2 g/t to 0.5 g/t Au). At the base of the volcanic unit, there is a shallow-dipping, 10 m to 35 m wide silicified zone (averaging 0.7 g/t to 1.5 g/t Au), and, below this zone, there is a sequence of oxidized shales that is also cut by quartz veinlets and hydrothermal breccias (averaging 0.2 g/t to 0.6 g/t Au) with low silver values.

The Jesus Maria prospect was initially considered to be a relatively narrow but high-grade vein-type target; however, drilling carried out in 2013 and 2014 encountered 20 m to 80 m wide intervals of predominantly silver-rich mineralization (with accessory gold and base-metal values). Based on the widths of mineralization, the Jesus Maria might be amenable to open-pit extraction methods. At their eastern limits, the deposits are separated by approximately 300 m; however, the mineralized zones are interpreted as merging to the west. Additional drilling between the western limit of the Jesus Maria deposit and the El Capitan deposit could connect the two zones and delineate additional mineralization.

The Mineral Resource statement for the El Capitan and Jesus Maria deposits is shown in Table 1.1; the resources are not constrained within pit shells but include mineralization, above cut-off, that is within a maximum depth of 150 m below surface. There are no adjustments for recovery or dilution in the statement of mineral resources. It is important to note that these are estimates of mineral resources, not mineral reserves, as the economic viability has not been demonstrated.

Table 1.1: Inferred Mineral Resource Estimate

DepositktonnesGold (g/t)Silver (g/t)Contained Gold (koz)Contained Silver (koz)
El Capitan 20,722 0.458 2.8 305 1,832
Jesus Maria 7,573 0.105 62.3 26 15,158
Combined 28,295 0.364 18.7 331 16,990

To date 86 holes have been drilled in the property.

drill hole penoles s


Marc Idziszek, P.Geo., 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.

November 2020 - The first seven drill holes from the current and on-going 6,000 metre reverse circulation (RC) drill program at the Peñoles Project is complete. This initial drill campaign is focused on testing the continuity of known gold-silver zones at the Capitan Hill Deposit, both along strike and down-dip of the March 2015, 43-101 compliant, inferred resource outline, as well as infill significant gaps within the resource model. The first seven drill holes of the program are presented herein, all of which intersected Capitan Hill style mineralization that is consistent in grade and width with previous drilling.

Drill Highlights:

  • RC Hole (20-CARC-06): intersected 45.7 m of 0.63 g/t gold within a larger interval of 111.3 m of 0.34 g/t gold;
  • RC Hole (20-CARC-05): intersected 76.2 m of 0.41 g/t gold and 21 g/t silver including 16.8 m of 0.68 g/t gold and 28.5 g/t silver; 
  • RC Hole (20-CARC-03): intersected 68.6 m of 0.4 g/t gold and 11 g/t silver including 16.8 m of 0.74 g/t gold and 15.9 g/t silver;
  • RC Hole (20-CARC-02): intersected 56 m of 0.4 g/t gold including 25.9 m of 0.53 g/t gold;
  • New gold zones discovered in the hanging wall of Capitan Main zone, that provide an additional, near surface opportunity to expand the March 2015 resource within the conceptual, open-pit shell;
  • Drill results support management's view that there is significant room to expand the existing oxide resource; 
  • Drilling is ongoing and the company anticipates completion of the 6,000 meter RC drill program in March/April 2021.


 Overview of the Fall/Winter 2020 Drill Program

Expansion Drilling, Capitan Main Zone

RC holes 20-CARC-01, 03, and 05 located on sections 100, 400, and 250 respectively, tested the continuity of the gold-silver mineralization down dip of the 2015 Inferred Resource.

All of the RC drill holes above successfully intersected the Capitan Hill Main Zone, with results being consistent with the grade and width of the previous drilling. These new holes extended the Capitan Hill Main gold-silver mineralization down-dip between 50 to 120 m. Drill results include 76.2 m of 0.41 g/t gold in hole 20-CARC-05, 68.58 m of 0.4 g/t gold in hole 20-CARC-03 and 51 m of 0.439 g/t gold in hole 20-CARC-01. Click here for link to cross-sections.

RC Hole 20-CARC-01, located on section 100, collared near the eastern edge of the Capitan Hill Main Zone. The hole was mineralized through its entire length starting from surface and was ended in mineralization. This hole extended the Capitan Hill Main Zone by 120 m down dip from previous drilling. 

In addition to intersecting the Capitan Hill Main Zone, RC holes 20-CARC-05 and 20-CARC-03, also cut significant values of silver mineralization, expanding the continuity of silver mineralization at depth. Silver values in RC hole 20-CARC-05 include 60.96 m of 25.15 g/t silver that includes a higher-grade zone of 33.5 m of 33.67 g/t silver. 

All of the expansion holes were oxidized through their entire length, with RC holes 20-CARC-01 and 03 getting into sulphide mineralization at drill hole depths of 173.7 m and 184.4 m respectively. 

Infill Drilling, Capitan Main Zone

Infill drilling in the current program was designed to confirm the presence of the Capitan Hill Main zone in areas where significant gaps (75-100 m ) existed in the 2015 Inferred Resource model. All holes presented below successfully confirmed the presence of the Capitan Hill Main Zone. 

RC hole 20-CARC-06 was drilled on section 250 and was designed to test a roughly 100-metre wide gap between previously drilled diamond drill holes CDDH-12-10 and CDDH-08-02. Hole 20-CARC-06 intersected the main Capitan Hill Zone from 35.1 m to 146 m, with a total drilled width of 111.25 m grading 0.342 g/t gold, including 45.7 m of 0.626 g/t gold. (See Drill Table below

RC Hole 20-CARC-07 was drilled on section 300, between previously drilled diamond drill holes CDDH-08-05 and CDDH-12-12 to infill a large >100 m wide gap. The hole cut the main mineralized zone in three, narrowly separated, intercepts that are bound by anomalous gold mineralization. These include 22.9 m of 0.2 g/t gold, 35.1 m of 0.27 g/t gold and 50.3 m of 0.22 g/t gold. The hole bottomed in anomalous mineralization and could not be drilled to its completed depth due to technical issues. 

RC Hole 20-CARC-02 was drilled on section 000 and designed to test a >100 m wide gap between CDDH-12-17 and surface. The hole successfully intersected the Capitan Hill Main Zone and confirmed its presence up-dip, to surface, and was mineralized almost over its entire length. Significant values include 0.284 g/t gold over 29 m and 56.4 m of 0.398 g/t gold.

New, Near Surface Hanging Wall Gold Zones

Drilling prior to the March 2015 resource statement at Capitan Hill indicated the possibility of additional zones of oxidized, gold-silver mineralization located in the hanging wall to the Capitan Hill Main Zone. However, due to a lack of drilling, the significance of these zones was poorly understood and precluded from being captured in the March 2015 resource estimate. 

In the current program, RC holes 20-CARC-03, 05 and 07 confirmed the presence and continuity of these "Hanging Wall Zones", highlighting the potential to enhance the existing resource. The most significant results include 30.5 m of 0.22 g/t gold starting from surface in RC hole 20-CARC-03; 22.9 m of 0.199 g/t gold in RC hole 20-CARC-07, and 35.05 m of 0.15 g/t gold in RC hole 20-CARC-05.

Table 1. Table of drill results
Hole NameAzimuthDipSectionZoneFrom (m)To (m)Interval (m)True Width (m)Au (ppm)Ag (ppm)OX-SUL
Interval 28 70° 100 Capitan Main 0 10.7 10.7 10.5 0.112 0.15 OX
Interval       Capitan Main 22.9 41.1 18.3 18.0 0.115 0.15 OX
Interval       Capitan Main 45.7 64 18.3 18.0 0.196 0.2 OX
Interval       Capitan Main 70.1 97.5 27.4 27.0 0.248 0.26 OX
Interval       Capitan Main 100.6 115.8 15.2 15.0 0.139 0.25 OX
Interval       Capitan Main 121.9 173.7 51.8 51.0 0.439 1.64 OX
Including         135.6 173.7 38.1 37.5 0.546 2.01 OX
Interval       Capitan Main 173.7 201.2 27.4 27.0 0.282 2.13 SUL
Interval 28 40° 000 Capitan Main 0 42.7 42.7 42.5 0.245 0.18 OX
Interval       Capitan Main 50.3 79.2 29 28.9 0.284 0.15 OX
Interval       Capitan Main 83.8 140.2 56.4 56.2 0.398 0.81 OX
Including         112.8 138.7 25.9 25.8 0.526 1.56 OX
Interval       Capitan Main 144.8 160 15.2 15.1 0.281 1.62 OX
Interval 28 50° 400 Hanging Wall 0 30.5 30.5 30.5 0.222 0.15 OX
Interval       Hanging Wall 59.4 67.1 7.6 7.6 0.12 0.15 OX
Interval       Hanging Wall 77.7 83.8 6.1 6.1 0.12 0.15 OX
Interval       Hanging Wall 97.5 102.1 4.6 4.6 0.143 0.93 OX
Interval       Capitan Main 115.8 184.4 68.6 68.6 0.398 11.01 OX
Including       Capitan Main 117.3 134.1 16.8 16.8 0.741 15.88 OX
Interval       Capitan Main 184.4 189 4.6 4.6 0.138 3.73 SUL
Interval       Capitan Main 202.7 207.3 4.6 4.6 0.111 1.57 SUL
Interval 28 60° 400 Hanging Wall 0 10.7 10.7 10.7 0.132 0.3 OX
Interval       Captian Main 16.8 22.9 6.1 6.1 0.157 0.31 OX
Interval       Captian Main 30.5 68.6 38.1 38.1 0.341 1.78 OX

Interval 0 90° 250 Hanging Wall 0 3 3 2.6 0.133 0.15 OX
Interval       Hanging Wall 15.2 18.3 3 2.6 0.126 0.15 OX
Interval       Hanging Wall 47.2 82.3 35.1 30.4 0.146 0.15 OX
Interval       Capitan Main 135.6 138.7 3 2.6 0.253 0.73 OX
Interval       Capitan Main 149.4 225.6 76.2 66.0 0.414 21.02 OX
Including         167.6 184.4 16.8 14.5 0.68 28.49 OX
Interval 28 70° 250 Hanging Wall 18.3 29 10.7 10.7 0.236 0.15 OX
Interval       Capitan Main 35.1 146.3 111.3 111.3 0.342 1.69 OX
Including         89.9 135.6 45.7 45.7 0.626 2.88 OX
Interval 208 75° 300 Hanging Wall 6.1 33.5 27.4 19.4 0.114 0.15 OX
Interval       Hanging Wall 67.1 70.1 3 2.1 0.193 0.15 OX
Interval       Capitan Main 91.4 114.3 22.9 16.2 0.199 1.35 OX
Interval       Capitan Main 120.4 155.4 35.1 24.8 0.266 5.2 OX
Interval       Capitan Main 160 210.3 50.3 35.6 0.216 4.83 OX
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