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Cornish Metals Reports Successful Exploration Drilling at Wide Formation Target, South Crofty Tin Project

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Cornish Metals Reports Successful Exploration Drilling at Wide Formation Target, South Crofty Tin Project






Wide Formation Mineralisation Confirmed Over a 1.6km Strike Length
New Great Flat Lode Splay Discovered

Multiple New Mineralised Structures Intersected Between the Great Flat Lode and Wide Formation


Cornish Metals Inc. (TSX-V:CUSN) (AIM:CUSN) a mineral exploration and development company focused on advancing the South Crofty tin project located in Cornwall, United Kingdom, to a construction decision, is pleased to report results from the first six drill holes of the ongoing 9,000 metre Carn Brea drill programme.


All six drillholes intersected the Wide Formation lode structure, which is characterised by strong tourmaline alteration and variable tin mineralisation, similar to all historically mined tin-bearing structures in the South Crofty area.


Drilling has also identified a new mineralised structure lying directly beneath the Great Flat Lode (named the “Great Flat Lode Splay”), as well as several high-grade, steeply dipping tin zones between the Great Flat Lode and the Wide Formation (see cross sections at the end of this release).



  • All six drill holes intersected the Wide Formation at the expected target depths, proving the exploration model for a parallel tin mineralised structure beneath the Great Flat Lode;
  • Wide Formation structure has been confirmed over a strike length of at least 1.6km, a downdip extent of at least 525m, thicknesses ranging from 1.8m – 4.8m, and remains open;
  • Notable tin intercepts from the Wide Formation (Figure 2 and Figure 3), including:
    • 1.21m grading 0.87% Sn in CB23_004
    • 1.90m grading 0.83% Sn in CB23_006
  • Notable tin intercepts from the newly identified Great Flat Lode Splay (Figure 2), including:
    • 3.38m grading 1.01% Sn in CB23_002
    • 1.00m grading 1.56% Sn in CB23_004
  • Notable tin intercepts from multiple steeply-dipping, high-grade tin zones mainly intersected between the Great Flat Lode and the Wide Formation, including:
    • 0.30m grading 7.48% Sn and 3.09m grading 1.21% Sn in CB23_001
    • 1.21m grading 1.83% Sn in CB23_004
    • 3.06m grading 0.93% Sn in CB23_005
    • 1.17m grading 0.62% Sn in CB23_006
  • A further eight drill holes are planned, testing a 2.5km strike length of the Wide Formation;
  • Table 1 below presents all significant intercepts.


Richard Williams, CEO and Director of Cornish Metals, stated: “These results confirm Cornish Metals’ model that the Wide Formation represents a new, large-scale, tin-bearing exploration target lying beneath the historically mined Great Flat Lode. The discovery of additional mineralised structures above and below the Wide Formation is a bonus.


The intensity of alteration and the strength and thickness of the Wide Formation structure is similar to others in the region, and the next step for us is to define the location, orientation and extent of the high grade pay shoots, which are typical of this style of mineralisation.


The discovery of the Great Flat Lode Splay and the other new zones of high-grade tin mineralisation demonstrates the exploration upside of this area, which we view as having tremendous potential to add to our current Mineral Resource base at South Crofty.“


The Wide Formation


The Wide Formation represents a new high-grade tin target in the Carn Brea South exploration area, located along the southern boundary of the South Crofty underground mine permission area. A 14-hole / 9,000 metre drilling programme commenced in Q3 2023, with the first six holes confirming the Wide Formation lies parallel to, north of, and beneath the Great Flat Lode.


The drill programme is designed to test the geometry and the continuity of tin mineralisation within the Wide Formation over an area measuring 2,500m along strike (northeast to southwest) and 525m downdip to the southeast. Drilling to date has intersected the Great Flat Lode and Wide Formation tin mineralisation structures where expected, confirming continuity of the Wide Formation over a 1.6km strike length and 525m downdip.


Two drill rigs are currently on-site, drilling holes CB23_008 and CB23_009 of the programme with future holes planned to continue testing the Wide Formation along strike, and to improve on-target definition.


The Great Flat Lode Splay


Drilling has also intersected a previously unrecognised splay structure immediately beneath the Great Flat Lode. The Great Flat Lode Splay is mineralised, varies up to 9m in thickness, and represents an important new exploration target less than 280m below surface (see drill intercepts in table below and cross sections at the end of this release).


New Steeply Dipping Tin Zones


The ongoing drill programme also intersected multiple steeply dipping high-grade tin zones, mainly located between the Great Flat Lode and the Wide Formation (see table below and cross here). More work is required to determine the orientation and true thickness of these zones. Identifying areas where these structures intersect both the Great Flat Lode and the Wide Formation is of particular interest as these intersection points represent areas of greater fracturing and potential for high grade tin mineralisation.


Hole ID From (m) To (m) Length (m) Sn % Comment
CB23_001 31.60 36.21 4.61 0.08 Great Flat Lode
Including 33.90 34.78 0.88 0.30  
CB23_001 441.74 442.04 0.30 7.48 New Zone
CB23_001 537.32 541.33 4.01 0.06 Wide Formation
 Including 540.38 540.91 0.53 0.31  
CB23_001 607.99 611.08 3.09 1.21 New Zone
Including 607.99 608.90 0.91 2.57  
And 609.86 611.08 1.22 0.61  
CB23_002 204.23 208.20 3.97 0.32 Great Flat Lode
Including 204.23 206.34 2.11 0.60  
And 204.23 205.28 1.05 0.90  
CB23_002 227.13 234.02 6.89 0.62 Great Flat Lode Splay
Including 227.13 230.51 3.38 1.01  
And 229.30 230.51 1.21 2.52  
CB23_002 612.37 616.32 3.95 0.08 Wide Formation
Including 614.81 615.30 0.49 0.58  
CB23_003 255.65 256.40 0.75 0.43 Great Flat Lode
CB23_003 266.98 277.16 10.18 0.05 Great Flat Lode Splay
Including 272.35 273.10 0.75 0.45  
CB23_003 473.37 477.81 4.44 0.26 New Zone
Including 473.37 474.37 1.00 0.60  
CB23_003 643.72 646.53 2.81 0.06 Wide Formation
CB23_004 198.17 198.87 0.70 0.01 Great Flat Lode
CB23_004 252.89 259.62 6.73 0.26 Great Flat Lode Splay
Including 258.62 259.62 1.00 1.56  
CB23_004 373.81 375.17 1.36 1.13 New Zone
CB23_004 528.47 529.68 1.21 1.83 New Zone
CB23_004 538.77 540.64 1.87 0.69 New Zone
Including 539.88 540.64 0.76 0.96  
CB23_004 700.84 705.24 4.40 0.25 Wide Formation
Including 703.47 704.68 1.21 0.87  
CB23_005 78.66 82.72 4.06 0.08 Great Flat Lode
CB23_005 350.60 359.43 8.83 0.42 New Zone
Including 351.19 354.25 3.06 0.93  
CB23_005 703.70 710.27 6.57 0.05 Wide Formation
CB23_006 64.11 65.99 1.88 0.91 Great Flat Lode
CB23_006 152.29 153.46 1.17 0.62 New Zone
CB23_006 511.98 512.59 0.61 1.60 New Zone
CB23_006 549.62 551.52 1.90 0.83 Wide Formation
Including 549.62 550.63 1.01 1.30  

Table 1 – Selected drilling results from holes 1-6 at the Wide Formation target.
Note 1 – True thickness of down-hole intersections reported are expected to be approximately 70-100% of the down-hole lengths.



Hole ID Hole Length
CB23_001 617.7m
CB23_002 698.9m
CB23_003 731.3m
CB23_004 773.6m
CB23_005 759.3m
CB23_006 614.3m

Table 2 – Drill hole lengths from surface to end of hole.





The geology in the Carn Brea South exploration area is identical to that at South Crofty, comprising metasediments (locally termed “killas”) which overlie an intrusive granite body. The mineralisation of the Wide Formation consists predominantly of blue tourmaline with disseminated cassiterite, hosted within a siliceous tourmaline altered granite. The cassiterite is mostly hosted within tourmaline-quartz veins which overprint the interpreted earlier blue tourmaline lode structure. No mining has ever been carried out on the Wide Formation.


The Great Flat Lode Splay, discovered up dip of Wheal Bassett mine (Figure 1), occurs as a blue tourmaline-rich lode with quartz (occasionally brecciated) hosting disseminated cassiterite mineralisation. The mineralised structure, which appears to separate away from the metasediment/granite boundary of its shallower counterpart, is hosted within strongly altered granite. This structure forms an unmined splay off the Great Flat Lode, is several meters thick and has an approximate area of 700m by 450m.


The Wide Formation, Great Flat Lode Splay, and new zones of steeply dipping high-grade tin mineralisation warrant further exploration.




Drilling at Carn Brea South was performed by Priority Drilling Company Ltd using an Atlas Copco CS14 Diamond Drill Rig. Hole construction consisted of HQ (96.1-millimeter (“mm”) diameter) to recover 72.8mm diameter drill core from within the shallower Great Flat mineralised zone, before reducing to NQ (76-mm diameter) to recover a 48mm diameter drill core when drilling at depth through the Wide Formation target. On completion, holes were multi-shot surveyed using a Reflex EZ-Trac. Core recovery was greater than 95%. The core was logged, split via core saw, and sampled by Cornish Metals personnel. The samples, comprising half core, were sent for assay at ALS Minerals, Loughrea, Ireland. Sample preparation involved crushing to 70% less than 2mm, riffle split and pulverised to 85% less than 75 microns. The analytical method used for tin, copper, tungsten, zinc, and arsenic was X-ray florescence (“XRF”) following a lithium borate fusion. A multi-element 4 Acid Digestion ICP-AES analysis was also carried out to further characterise the mineralisation and alteration assemblages. Overlimit assays on silver were carried out using a 3-acid digest and a HCl leach ICP AES analysis. Comprehensive Quality Assurance / Quality Control programme using standards, duplicates and blanks was included within the sampling programme.


The technical information in this news release has been compiled by Mr. Owen Mihalop who has reviewed and takes responsibility for the data and geological interpretation. Mr. Owen Mihalop (MCSM, BSc (Hons), MSc, FGS, MIMMM, CEng) is Chief Operating Officer for Cornish Metals Inc. and has sufficient experience relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined under the JORC Code (2012) and as a Qualified Person under NI 43-101 and AIM. Mr. Mihalop consents to the inclusion in this announcement of the matters based on his information in the form and context in which it appears.




Cornish Metals is a dual-listed company focused on advancing the South Crofty high-grade, underground tin Project through to a construction decision, as well as exploring its additional mineral rights, all located in Cornwall, United Kingdom.

  • South Crofty is a historical, high-grade, underground tin mine that started production in 1592 and continued operating until 1998 following over 400 years of continuous production;
  • The Project possesses Planning Permission for underground mining (valid to 2071), to construct new processing facilities and all necessary site infrastructure, and an Environmental Permit to dewater the mine;
  • South Crofty has the 4th highest grade tin Mineral Resource globally and benefits from existing mine infrastructure including multiple shafts that can be used for future operations;
  • Tin is a Critical Mineral as defined by the UK, USA, and Canadian governments, with approximately two-thirds of the tin mined today coming from China, Myanmar and Indonesia;
  • There is no primary tin production in Europe or North America;
  • Tin connects almost all electronic and electrical infrastructure, making it critical to the energy transition – responsible sourcing of critical minerals and security of supply are key factors in the energy transition and technology growth;
  • South Crofty benefits from strong local community and regional and national government support.
  • Cornish Metals has a growing team of skilled people, local to Cornwall, and the Project could generate 250 – 300 direct jobs.


An updated Mineral Resource was completed in September 2023 with a 39% increase in tonnes and 32% increase in contained tin in the Indicated category for the Lower Mine (see news release dated September 13, 2023) as summarised below:


South Crofty Summary (JORC 2012) Mineral Resource Estimate
Area Classification Mass
Grade Contained Tin /
Tin Equivalent
Lower Mine Indicated 2,896 1.50% Sn 43.6
Inferred 2,626 1.42% Sn 37.4
Upper Mine Indicated 260 0.99% SnEq 2.6
Inferred 465 0.91% SnEq 4.2


The Mineral Resource Estimate for South Crofty is available in a report titled “South Crofty Tin Project – Mineral Resource Update NI 43-101 Technical Report”, dated October 27, 2023, co-authored by Mr. N. Szebor (MCSM, MSc, BSc, CGeol, EurGeol, FGS) and Mr. R. Chesher (FAusIMM(CP), RPEQ, MTMS) of AMC Consultants, and can be accessed through the above link and on the Company’s SEDAR+ page.


Posted February 5, 2024

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