- Activity continuing throughout 2021 with aim to deliver maiden JORC gold and silver resource for El Refugio in H2
- Drill hole CDH-050 at the El Refugio target returned the exceptional result:
- 4.17m @ 62.0 g/t gold and 445 g/t silver from 233.43m
- CDH-050 intercept supports the geologic model at El Refugio with significantly increased gold-silver grade-thickness with depth
- La Soledad drill hole CDH-054 has returned:
- 4.88m @ 10.36 g/t gold and 80.9 g/t silver from 288.25m
- The high-grade intercept extends the mineralisation further to the west and down dip
- La Soledad is developing as a ‘vein swarm’ system with multiple high-grade veins intercepted
- Soil sampling programs completed within the Cometa Project and Reyes Project areas
- Share placement completed for $5m (before costs)
- Cash at bank $4.1 as at 31 March
Mithril Resources Ltd (ASX: MTH) (Mithril or the Company) is pleased to provide an update on activities at its Copalquin Gold Silver Project in Mexico for the period ending 31 March 2021.
Exploration work in the Copalquin Gold-Silver District has progressed at a fast pace for the first three months of 2021 with the completion of 15 diamond drill holes and an extensive soil sampling program across 2 project areas. The Mithril exploration team reported that holes successfully intercepted the targeted geological structures at El Refugio and La Soledad. The main target areas of El Refugio and La Soledad yielded strong results further establishing this part of the district as the principal area of exploration drilling and resource development.
The current Refugio vein model shows a flexure in the vein between holes CDH-051 and CDH-025. This kind of flexure is a good structural target to concentrate our drilling between these sections. Within this 200-metre flexure zone, assay results from CDH-053 and visual results from CDH-062 continue to suggest that we are still near the top of the best mineralisation and should continue significantly deeper.
The drill plan for next quarter tests the deeper part of this flexure with hole CDH-063 and below CDH-053. The plan is also targeted to extend the Refugio mineralised zone 180 m further west. Mapping has shown hydrothermal breccia and alteration in the ridge further west of El Refugio, and this will be drill tested towards end of May 2021. Extensional holes have been planned for the adjacent La Soledad target following on from the high-grade intercept reported from hole CDH-054. These holes will test for deeper vein intercepts and yield more information across several (3 or 4) veins.
Further planned holes are at the El Cometa target area to test for deeper vein structures and vein coalescence in the area with the continuation of the El Refugio structure to the east. Two holes located 300 metres to the east of La Soledad will be the first ever drilled where the historic El Indio mine workings and veins are located.
Drilling has progressed on time and on budget, with the company remaining in a strong cash position following the raising of $5m (before costs) at the end of January 2021.
El Refugio to Los Reyes
Hole CDH-050 was drilled to test the depth extension at El Refugio and holes CDH-051 to 053 are shallower infill holes drilled on the eastern side of the El Refugio target (see ASX announcement 18th March 2021).
Hole CDH-050 (4.17m @ 62.0 g/t gold and 445 g/t silver from 233.43m) has intercepted the same clavo (ore shoot) intercepted by last year’s hole CDH-033 (9.35m @ 7.84 g/t gold and 138g/t silver from 206.3m) and hole CDH-020 (8.7m @ 3.06 g/t Au and 93.6 g/t Ag from 176.85m). The grade-thickness of the clavo has increased with depth with visible gold observed in a 15 cm section of vein in CDH-050. This vein was characterized by abundant black sulphide (ginguro) which is made up of silver sulphides and sulphosalts plus gold. The same interval also contained kaolinite, a clay mineral that only forms under very acidic conditions. Acid conditions in a low sulphidation system is an indicator of fluid-mixing which is known to be a very efficient trigger for gold/silver deposition. Visible gold has been seen in core from other drill holes including hole CDH-001 at La Soledad and CDH-053 at El Refugio.
The long section below in Figure 1 shows the pierce points of drill holes completed at the El Refugio to Los Reyes targets and the current the grade thickness contour interpretation. Further drilling, as shown on the long section, will target depth extensions and systematically extend mineralisation to the east and west.
1Metal equivalent grades calculated using 70 g/t Ag = 1 g/t Au, based on gold price of USD1,610 per ounce and silver price of USD23 per ounce.
The above cross section in Figure 4 illustrates the apparent grade thickness has increased with depth at the El Refugio target. Below in Figure 5 is a digital microscope image of drill core from hole CDH-050 showing visible gold and silver minerals.
The mineralogy and textures observed in the core suggest the existence of multiple boiling zones and multiple mineralisation events. El Refugio is very near the upwelling zone of a hydrothermal cell where the breccia zone reaches widths of up to 30 meters true width. The hole CDH-050 intercept is characterized by abundant black sulphide (ginguro) which is made up of silver sulphides and sulphosalts plus gold. The same interval also contained kaolinite, a clay mineral that only forms under very acidic conditions. Acid conditions in a low sulphidation system are an indicator of fluid-mixing which is known to be a very efficient trigger for gold/silver deposition.
Infill drill holes on the eastern side of the El Refugio target towards the El Cometa target intercepted high-grade gold and silver mineralisation.
Hole CDH-051 (3.4m @ 4.72 g/t gold and 170.8 g/t silver from 135.6m), and hole CDH-053 (11.6m @ 2.28 g/t gold and
55.3 g/t silver from 151m) plus CDH-052 (8.07m @ 0.92g/t gold and 39.2 g/t silver from 143.8m) have infilled the area between El Refugio and El Cometa and show excellent continuity of structure and grade (see ASX announcement 18th March 2021).
The drill hole results for CDH-051 to 053 and the geologic logging suggest deeper drilling is warranted in this area towards the El Cometa target and at the El Cometa target itself.
Los Reyes Target
In December 2020 results from the first scout drill holes at the Los Reyes target at the Reyes Project were reported. The first drill holes successfully intercepted the extensive low angle structure with high-grade gold and silver. Hole CDH-040 intercepted a high-grade gold-silver vein of 2.22m @ 34.6 g/t AuEq.1 (32.35 g/t gold and 184.8 g/t silver) from 91.55m (CDH- 040), including 1.22m @ 61.1 g/t AuEq.1 (58.6 g/t gold and 203 g/t silver) plus 0.70m @ 10.9 g/t AuEq.1 (9.3 g/t gold and 125 g/t silver) from 75.9m plus 1.20m @ 3.11 g/t AuEq.1 (2.05 g/t gold and 85 g/t silver) from 84.82m. Hole CDH-041 was located 40 metres south-east of hole CDH-040 and intercepted 3.0m @ 3.9 g/t AuEq.1 (2.86 g/t gold and 83.8 g/t silver) from 103m, including 0.6m @ 11.9 g/t AuEq.1 (9.79 g/t gold and 165.0 g/t silver). (see ASX announcement 21st December 2020).
Five follow-up scout holes were drilled during the first quarter of 2021 at Los Reyes and El Cristiano targets 2 kilometres east of El Refugio, intersecting structures with two of the holes. 1.08m @ 1.55 g/t AuEq.1 (0.80 g/t gold and 53.1 g/t silver) from 44.3m (CDH-056) and 0.95m @ 1.49 g/t AuEq.1 (0.85 g/t gold and 44.6 g/t silver) from 76.75m (CDH-057).
The soil sampling program completed at Los Reyes during the quarter and detailed below, shows strong silver anomalies at this target area. Further drilling is planned for Los Reyes later in the program for 2021 and targeting what appears to be a sheeted vein system with staked, discontinuous veins for high-grade gold and silver.
La Soledad to El Indio
Results for drill hole CDH-054 were received for the first hole drilled for 2021 at the La Soledad target reporting 4.88m @
10.36 g/t gold and 80.9 g/t silver from the Leon vein 288.25m down hole (see ASX announcement 24th March 2021).
Figure 9 is a plan view of the La Soledad vein model and historic mine workings with drill hole traces for Mithril’s drilling to date. Future drilling will target zones where the veins are projected to intersect the El Refugio vein as well as extending the mineralisation to the west of El Refugio and to the west and north east of La Soledad. Importantly, the geologic model is also indicating to drill deeper at the El Cometa target than our first campaign of drill holes in 2020.
Soil Sampling Program January-February 2021
In order to evaluate large areas by a systematic method Mithril Resources has carried out an extensive soil sampling program for silver with the objective of refining the drill targets based on structural mapping and identifying new targets not identified by mapping (see ASX announcement 24th March 2021).
Soil sampling is a ‘tried and true’ method for evaluating large areas systematically. The entire Copalquin project is characterised by thin, arid soils subject to rapid erosion. There is little development of multiple soil horizons. Only a thin 5 – 10 cm organic A-horizon above a 0 – 100 cm B horizon, then bedrock. Sample grids were laid out in Mapinfo software on a 25m x 50m grid with lines-oriented N-S. In drainage areas or areas underlain by mass wasting deposits sample points were omitted. Samples were collected using a steel pick and a plastic bowl as a scoop/shovel. All samples were collected from 20
– 30 cm depth. Samples were passed through a 10 mesh (2mm) and then -80 mesh (180 micron) screen in the field then bagged in heavy brown paper envelopes as is common for soil samples. The samples were returned to the core shed where they were sun dried in their sample envelopes for 2 to 3 days. After drying the samples had an approximately 10g portion split off and placed in a plastic sample-holder. Samples were then analysed on site by our staff geologists using an Olympus Vanta 50Kv X-Ray fluorescence (XRF) analyser. Readings were taken at two beam wavelengths, 50 KV for 120 seconds and 15 KV for 30 seconds. Results were obtained for Silver, zinc, lead, copper and a suite of other elements including elements indicative of alteration such as Potassium and Barium. The remaining sample (200g each were sent to Bureau Veritas assay lab for fire assay for gold. These results are pending.
Samples were collected from four areas, Los Pinos/El Indio, Los Reyes, Refugio west and Zaragosa. A total of 697 samples were collected and analysed with the XRF.
|Area||Number of samples|
|Los Pinos/El Indio||373|
Table 1 Soil samples collected and analysed for silver using a portable XRF analyser.
Results and Interpretation
Anomalous silver was identified in all targets. Silver is considered to be a good indicator for hidden veins or portions of known veins that are better mineralized. Silver is more mobile that gold and is more likely to be diffused further from the veins. Anomalous silver generally corresponds to the mapped structures. Values range from less than detection (approximately 2 ppm) to 154 ppm Ag. Samples were considered anomalous at or above 5 ppm Ag.
At El Indio there is a strong silver anomaly (up to 151 g/t in soil) near the old mine workings.
Silver is present in distinctly anomalous levels over a large area. Eleven samples returned greater than 5 ppm Ag with a high of 154 ppm Ag. Silver distribution follow the mapped structure and confirms that our existing drill plan is well considered.
Nine samples returned greater than 5 ppm silver from Zaragosa. This indicates that the Copalquin/Zaragosa structure continues to the west of the large Soledad Arroyo. Further mapping is planned before planning to drill this target.
Clay altered areas were observed while collecting soil samples at Refugio West, but none of the samples indicated silver content above 5 ppm from the XRF analysis. It is likely that the mineralized portion of the Refugio structure is deep enough that anomalies are not reflected in the soil samples. The soil sampling program covered the area tested with holes CDH-024 and CDH-025 both of which had mineralized intercepts. Silver is present in the soils from the area of holes CDH-024 and CDH-025, but values are between 3 to <5 ppm.
To ensure the Company maintains its focus on the Copalquin Gold Silver Project, Mithril has exploration partners to farm- in, sole fund and operate exploration activities on its Australian assets. These include:
- Great Boulder Resources (GBR.ASX) at the Lignum Dam Project;
- Auteco Minerals (AUT.ASX) at the Limestone Well Project;
- Carnavale Resources (CAV.ASX) at the Kurnalpi Project; and
- CBH Resources Limited (“CBH”) at the Billy Hills Zinc Project.
Having farm-in exploration partners solely fund all exploration costs, ensures that the Mithril tenements are kept in good standing for the duration of the respective partnership agreements with the potential to benefit from prospectivity and exploration upside.
Billy Hills Zinc (Billy Hills)
- Mithril 100%; and
- CBH Resources Limited earning up to 80% interest by completing expenditure of A$4M over 5 years.
The binding farm-in Heads of Agreement (Agreement) is conditional upon Mithril obtaining a Heritage Clearance to drill the Firetail Prospect. Mithril worked with the traditional owners of Billy Hills to obtain the necessary clearance however due to the outbreak of COVID-19, all dealings with Aboriginal communities in the area ceased for an indefinite period in order to protect the health of the local population. Mithril and CBH remain committed to the Project and agreed to extend the period, to satisfy the Agreement’s Condition Precedent, first from May 2020 to November 2020 and during the quarter a second extension to March 2021, in recognition of the current circumstances.
Kurnalpi Project (Kurnalpi)
- Mithril 100%; and
- Carnavale Resources earning an initial 80% interest by keeping the tenements in good standing over three years and paying Mithril A$250,000 cash.
In September 2020, Carnavale undertook a small drilling program at its Grey Dam Nickel Project (including on Mithril tenements) following a Fixed Loop Electromagnetic (FLEM) geophysical surveying over ultramafic/mafic sequences prospective for Kambalda style nickel sulphide, similar to the nearby Black Swan and Silver Swan Nickel Mines. The drilling confirmed and enhanced the understanding of the geology of the drilled area. The geochemistry and multi-element assay results remain positive for the development of nickel sulphide mineralisation within the project area (see Carnavale’s ASX Announcement 6th November 2020).
Carnavale’s Grey Dam Nickel Project includes Mithril’s Kurnalpi Project Tenements in which it is earning an initial 80% interest. Carnavale’s September 2020 drill program included drilling on the Mithril tenements (see Carnavale’s ASX Announcement 11th September 2020).
Lignum Dam Project (Lignum)
- Mithril 100%; and
- Great Boulder Resources earning up to 80% by completing expenditure of A$1M over four years.
During the quarter Great Boulder undertook a program of bottom-of-hole sampling of historic air core and RAB drill holes with the aim of identifying new gold targets for future follow-up. At the time of writing Great Boulder was still assessing the results of the work.
Limestone Well Project (Limestone)
- Mithril 100%;
- Auteco Minerals can earn up to an 80% interest in the project by completing exploration expenditure of A$2.5 million over five years; and
- Following drilling (see Auteco’s ASX Announcement 14th October 2019), Auteco elected to continue sole funding the exploration work at Limestone Well by completing exploration expenditure of $1.5M by August 2021 to earn an initial 60% interest.
During the quarter Auteco carried out a reverse circulation drill program (7 holes / 1,233 metres) as a further test of the
project’s titanium – vanadium potential, the results of which are awaited.
Outlook for the Next Quarter
The Company’s objectives for the June 2021 Quarter is completion of the first phase of deeper drilling at El Refugio and deeper holes El Cometa, first holes at the Los Pinos target and continued detailed mapping in the district while the vegetation is still dry and dormant.
During the quarter Mithril received binding commitments for a placement to sophisticated and professional investors, comprising 263,157,895 fully paid ordinary shares in the Company (New Shares) at an issue price of 1.9 cents to raise approximately $5m (before costs). An applicable Appendix 3B pertaining to this Placement follows this announcement.
The placement was conducted by Taylor Collison as lead manager and within the Company’s placement capacity under ASX Listing Rule 7.1 (54,450,380 shares) and Listing Rule 7.1A (208,707,515 shares). Funds raised have been used to continue the 2021 drill programme in the Copalquin Gold Silver District in Mexico, to deliver a maiden JORC Resource and for general working capital.
Mr Adrien Wing resigned from the Board to pursue his other business interests and focus on his role as Mithril’s Company Secretary, effective 15 February 2021. Adrien has been a Non-Executive Director of Mithril since 2019 and in that time been pivotal in the Company’s restructure and direction towards its transformative high grade gold silver project at the Copalquin District in Mexico.
The Company has cash reserves of as at 31March of $4.1m.
Related Party Payments
In line with its obligations under ASX Listing Rule 5.3.5, Mithril Resources Limited notes that the only payments to related parties of the Company, as advised in the Appendix 5B for the period ended 31 March 2021, pertain to payments to directors for fees, salary and superannuation.
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|
Competent Persons Statement
The information in this report that relates to sampling techniques and data, exploration results and geological interpretation has been compiled by Mr Hall Stewart who is Mithril’s Chief Geologist. Mr Stewart is a certified professional geologist of the American Institute of Professional Geologists. This is a Recognised Professional Organisation (RPO) under the Joint Ore Reserves Committee (JORC) Code.
Mr Stewart has sufficient experience of relevance to the styles of mineralisation and the types of deposits under consideration, and to the activities undertaken, to qualify as a Competent Person as defined in the 2012 Edition of the Joint Ore Reserves Committee (JORC) Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves. Mr Stewart consents to the inclusion in this report of the matters based on information in the form and context in which it appears. The Australian Securities Exchange has not reviewed and does not accept responsibility for the accuracy or adequacy of this release.
About the Copalquin District, Mexico
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.
Original Article: https://investi.com.au/api/announcements/mth/1900a61c-445.pdf