Highlight Results

  • At La Soledad, first round of drilling on eastern side of clavo intercepted sheeted vein system at relatively shallow downhole depths
    • 6.00m @ 1.84g/t gold, 23.0 g/t silver from 41.0m, (CDH-109), plus
    • 1.00m @ 1.79 g/t gold, 25.0 g/t silver from 55.0m, plus
    • 1.70m @ 1.77 g/t gold, 117 g/t silver from 59.3m, plus
    • 2.14m @ 0.89 g/t gold, 63.9 g/t silver from 78.5m
    • 4.80m @ 0.91 g/t gold, 56.8 g/t silver from 70.75m (CDH-110), plus
    • 2.30m @ 1.75 g/t gold, 135 g/t silver from 109.0m, including
    • 0.55m @ 5.89 g/t gold, 474 g/t silver from 110.75m
    • 8.10m @ 1.64 g/t gold, 106 g/t silver from 77.3m (CDH-111), including
    • 0.80m @ 4.59 g/t gold, 212 g/t silver from 78.3m, and including
    • 0.95m @ 7.99 g/t gold, 526 g/t silver from 82.45m, plus
    • 1.00m @ 1.50 g/t gold, 30.0 g/t silver from 98.0m, plus
    • 0.75m @ 1.59 g/t gold, 220 g/t silver from 107m, plus
    • 0.50m @ 2.21 g/t gold, 61.0 g/t silver from 140m, plus
    • 1.00m @ 1.20 g/t gold, 2.00 g/t silver from 190m
  • Exploration drilling, mapping and sampling program has defined over 7km of veins in the Copalquin Mining District
  • Major target area identified at La Montura, 2km east and along strike of El Refugio-La Soledad maiden resource area (373koz Au + 10.9Moz Ag)*
  • At Los Pinos strong alteration, gold in soils and now narrow, high-grade veins in early- stage drilling for development of this target along strike of El Refugio-La Soledad
    • 0.60m @ 9.91 g/t gold, 161 g/t silver from 78.1m (CDH-113)

Mithril Resources Ltd (ASX: MTH) (Mithril or the Company) is pleased to provide exploration results for its Copalquin Gold Silver Project in Mexico.

Mithril CEO and Managing Director, John Skeet, commented:

“Our expansive exploration program across the district has delivered excellent results ahead of resource development drilling along strike from the high-grade maiden resource at El Refugio. The vein system at La Soledad has been extended and we have intercepted veins further east of La Soledad and along strike at Los Pinos. Mapping and soil sampling has developed a large new target along the same mineralised trend at La Montura to be drill ready. La Montura, which shares similarities with El Refugio, is 2km along trend within low angle structures extending at least 4 km. Together with planned deep drilling at El Refugio and the confirmed extension at Refugio West, Copalquin is well positioned for significant gold-silver resource growth throughout 2022.”

Drilling at La Soledad and East at Los Pinos

The series of holes completed at La Soledad have clearly shown the existence of a sheeted vein system and association with a granodiorite pre-mineral intrusion. The intrusion of the granodiorite into the favourably- fracturing andesite rock unit, created cracks and voids that later became sites for mineralised deposits. Where there are voids along the gold-silver veins, favourable conditions lead to the formation of high-grade ‘clavos’ (oreshoots) such as the one mined historically at La Soledad and discovered at El Refugio, as part of the maiden resource drilling. The recent drilling and interpretation at La Soledad are guiding the discovery of further clavos and veins along strike and deeper at La Soledad, with highly encouraging results to date.

Figure 1 – Cross-section 40 for drill results at La Soledad holes CDH-109 to 111 plus previous drill hole results for holes CDH-008 and 011.
Sheeted vein system associated with the granodiorite intrusion.

At Los Pinos, the ridge just to the east of El Refugio-La Soledad, the extensive surface alteration and the strong gold in soils anomaly rank this area as a high-priority target. To date, only a handful of exploration holes have been completed at Los Pinos and importantly, drill hole CDH-113 has intercepted a narrow, high-grade vein only 78 metres down hole. Locating this high-grade vein allows planning of further drilling at Los Pinos as we continue to search of the main source of the alteration and strong surface gold anomaly. The angle and orientation of the vein suggest it may be on the same structure as the La Soledad veins, 700 metres away.

Figure 2 – La Soledad drill hole locations map.

District Middle Section – Target Expansion

The dry season mapping program (January-May) in the Copalquin District further strengthens data supporting the high prospectivity of the district. Already we have demonstrated the high-quality resource potential of the district with the excellent maiden resource with high-grade gold and silver at El Refugio-La Soledad delivered after only 15 months of drilling. New targets to the east and to the west of Refugio along the trend of rhyolite intrusives are being developed towards being drill-ready for expansion of the resource footprint. The best of these new targets to-date is the La Montura (the saddle) area which has over 500 meters of strike length of silicified rhyolite (highlighted in green, in the figure below. Soil sampling is underway at La Montura in preparation for drilling.

Figure 3 – Schematic long section of the Copalquin District middle mineralised trend which includes the maiden JORC resource at El Refugio/La Soledad.

Figure 4 – Geologist on silicified rhyolite dome at La Montura (Left). Exposure of silicified breccia at La Montura (Right). La Montura location is highlighted above in Figure 3 and below in Figure 5.

Figure 5 – Copalquin 70km2 concession area showing exploration target areas and locations of the schematic long sections shown in
La Montura Figure 3 and Figure 6.

Figure 6 – Schematic long section of the southern part of the Copalquin District.

Figure 7 – Soils sampling map for western half of the Copalquin District Middle Section (See Figure 3 and Figure 5) with mapped silicified
rhyolite domes shown in salmon colour. The domes are interpreted as the heat sources for the hydrothermal activity.


The Copalquin mining district is located in Durango State, Mexico and covers an entire mining district of 70km2 containing several dozen historic gold and silver mines and workings, ten of which had notable production. The district is within the Sierra Madre Gold Silver Trend which extends north-south along the western side of Mexico and hosts many world-class gold and silver deposits.

Multiple mineralisation events, young intrusives thought to be system-driving heat sources, widespread alteration together with extensive surface vein exposures and dozens of historic mine workings, identify the Copalquin mining district as a major epithermal centre for Gold and Silver.

Within 15 months of drilling in the Copalquin District, Mithril delivered a maiden JORC mineral resource estimate demonstrating the high-grade gold and silver resource potential for the district. This maiden resource is detailed below.

  • 2,416,000 tonnes @ 4.80 g/t gold, 141 g/t silver for 373,000 oz gold plus 10,953,000 oz silver (Total 529,000 oz AuEq*) using a cut-off grade of 2.0 g/t AuEq*
  • 28.6% of the resource tonnage is classified as indicated
 Tonnes (kt)Tonnes (kt)Gold (g/t)Silver (g/t)Gold Equiv.* (g/t)Gold (koz)Silver (koz)Gold Equiv.* (koz)
El RefugioIndicated6915.43114.27.061212,538157
La SoledadIndicated
Table 1 – Mineral resource estimate El Refugio – La Soledad using a cut-off grade of 2.0 g/t AuEq*

*AuEq. = gold equivalent calculated using and gold:silver price ratio of 70:1. That is, 70 g/t silver = 1 g/t gold. The metal prices used to determine the 70:1 ratio are the cumulative average prices for 2021: gold USD1,798.34 and silver: USD25.32 (actual is 71:1) from kitco.com

Mining study and metallurgical test work supports the development of the El Refugio-La Soledad resource with conventional mining methods indicated as being appropriate and with high gold-silver recovery to produce metal on-site with conventional processing.

Mithril is currently exploring in the Copalquin District to expand the resource footprint in 2022 to demonstrate its multi-million ounce gold and silver potential.

Mithril Resources is earning 100% interest in the Copalquin District mining concessions via a purchase option agreement detailed in ASX announcement dated 25 November 2019.

Figure 8 – Copalquin District location map with locations of mining and exploration activity within the state of Durango


Released with the authority of the Board.

For further information contact:

John Skeet
Managing Director and CEO
[email protected]
+61 435 766 809
Mark Flynn
Investor Relations
[email protected]
+61 416 068 733


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