(via TheNewswire)
Highlights:
Jervois receives results from surface drilling campaign at Sunshine deposit; programme fully refundable by
the United States (“U.S.”)Department of Defense (“DoD”) Defense Production Act (“DPA”) Title IIIUS$15 million grant award (“Agreement Funding”)
Sunshine is a historic resource adjacent to Jervois’s 100% owned ICO deposit
Results from seven-hole program (ca. 1,100 metres (“m”)) include:
2.9m calculated true width (“CTW”) @ 0.01% cobalt (“Co”), 0.27% copper (“Cu”), 0.03 grams per metric tonne (“g/t”) gold (“Au”) (Drillhole SS23-01A)
1.2m CTW @ 0.34% Co, 10.05% Cu, 13.68 g/t Au (Drillhole SS23-02)
1.7m CTW @ 0.68% Co, 0.35% Cu, 0.51 g/t Au (Drillhole SS23-03)
0.5m CTW @ 1.55% Co, 0.02% Cu, 1.30 g/t Au (Drillhole SS23-04)
2.6m CTW @ 0.78% Co, 0.12% Cu, 0.41 g/t Au (Drillhole SS23-05)
3.2m CTW @ 0.05% Co, 0.89% Cu, 0.07 g/t Au (Drillhole SS23-06A)
0.9m CTW @ 0.07% Co, 1.10% Cu, 0.03 g/t Au (Drillhole SS23-07)
Sunshine results will be used to validate historic drilling within the deposit and incorporated into an updated Sunshine Mineral Resource Estimate (“MRE”)
Jervois is continuing underground development to support extensional drilling of the RAM deposit, activities which are also fully refundable by the
DoD
Prior to these exploration programmes, ICO’s mineral resource and reserve is already the largest and highest grade confirmed cobalt orebody in the
U.S.
Cobalt has been declared by the
U.S. Government a critical mineral, and a reserve or price floor to sustain domestic American production has been put forward by theU.S. Congressional Select Committee on theChinese Communist Party (see Jervois ASX announcement dated13 December 2023 , “Jervois welcomesU.S. Congressional Select Committee proposal for a reserve to sustain cobalt price”)
Collar information is provided in Table 1, along with tabulated analytical results (Table 2), a plan view map showing drill pad locations (Figure 1) and a cross-sectional overview of drilling methodology (Figure 2).
Uncapped drill results include:
Hole SS23-01A intersected 2.9m CTW at 0.01% Co, 0.27% Cu, 0.03 g/t Au.
Hole SS23-02 intersected 1.2m CTW at 0.34% Co, 10.05% Cu, 13.68 g/t Au. In addition, mineralization was encountered in the hanging wall (HW”) to the Sunshine mineralized horizon, grading 0.42% Co, 0.18% Cu, 0.10 g/t Au across 1.0m CTW.
Hole SS23-03 intersected 1.7m CTW at 0.68% Co, 0.35% Cu, 0.51 g/t Au.
Hole SS23-04 intersected 0.5m CTW at 1.55% Co, 0.02% Cu, 1.30 g/t Au. Again, additional, mineralization was encountered in the footwall (FW”) to the Sunshine mineralized horizon, grading 0.15% Co, 0.71% Cu, 0.03 g/t Au across 2.2m CTW.
Hole SS23-05 intersected 2.6m CTW at 0.78% Co, 0.12% Cu, 0.41 g/t Au.
Hole SS23-06A intersected 3.2m CTW at 0.05% Co, 0.89% Cu, 0.07 g/t Au.
Hole SS23-07 intersected 0.9m CTW at 0.07% Co, 1.10% Cu, 0.03 g/t Au. In addition, mineralization was encountered in the HW to the Sunshine mineralized horizon, grading 0.78% Co, 0.19% Cu, 0.38 g/t Au across 0.9m CTW, as well as in the FW to the Sunshine mineralized horizon, grading 0.25% Co, 0.22% Cu, 0.03 g/t Au.
These drilling results will be utilized to confirm historic drill intercepts, comprised of 19,000m (104 drillholes) of core drilling, within the Sunshine deposit and be incorporated alongside within an updated Australian JORC / Canadian CIM compliant Sunshine Mineral Resource Estimate (“MRE”).
ICO continues with the resource extension programme at its RAM deposit (see ASX announcement dated
Based on the existing
Table 1: Sunshine Drillhole Collars
Coordinates * | ||||||
BHID (Hole ID) | Easting | Northing | Elevation (m) | Plan Azi | Plan Dip | Final Depth (m) |
SS23-01** | 199 | 5459 | 2414 | 252 | -70 | 23 |
SS23-01A | 203 | 5458 | 2414 | 230 | -80 | 253 |
SS23-02 | 198 | 5459 | 2414 | 286 | -50 | 191 |
SS23-03 | 168 | 5217 | 2463 | 298 | -51 | 106 |
SS23-04 | 169 | 5216 | 2463 | 235 | -51 | 111 |
SS23-05 | 170 | 5215 | 2463 | 184 | -45 | 134 |
SS23-06** | 170 | 5376 | 2455 | 245 | -59 | 123 |
SS23-06A | 169 | 5376 | 2455 | 251 | -55 | 154 |
SS23-07 | 172 | 5377 | 2455 | 216 | -58 | 168 |
*Coordinates provided in Mine Grid of RAM Deposit.
**Drill hole abandoned prior to mineralized intersection
Table 2: Sunshine Drilling Results
BHID (Hole ID) | Zone* | From (m) | To (m) | Calculated True Width** (m) | Cobalt (%) | Copper (%) | Gold (g/t) |
SS23-01A | SS | 189.7 | 193.5 | 2.9 | 0.01 | 0.27 | 0.03 |
SS23-02 | SS HW | 163.5 | 164.6 | 1.0 | 0.42 | 0.18 | 0.10 |
SS23-02 | SS | 180.6 | 182.0 | 1.2 | 0.34 | 10.05 | 13.68 |
SS23-03 | SS | 82.5 | 84.7 | 1.7 | 0.68 | 0.35 | 0.51 |
SS23-04 | SS | 55.9 | 56.6 | 0.5 | 1.55 | 0.02 | 1.30 |
SS23-04 | SS FW | 79.6 | 82.4 | 2.2 | 0.15 | 0.71 | 0.03 |
SS23-05 | SS | 99.2 | 104.5 | 2.6 | 0.78 | 0.12 | 0.41 |
SS23-06A | SS | 131.6 | 135.1 | 3.2 | 0.05 | 0.89 | 0.07 |
SS23-07 | SS | 146.5 | 147.5 | 0.9 | 0.07 | 1.10 | 0.03 |
SS23-07 | SS HW | 133.0 | 134.1 | 0.9 | 0.78 | 0.19 | 0.38 |
SS23-07 | SS FW | 155.8 | 158.2 | 1.9 | 0.25 | 0.22 | 0.03 |
* Sunshine (SS), Sunshine Hangingwall (SS HW), Sunshine Footwall (SS FW)
** Calculated true widths determined for the composited intercept mid-point, perpendicular to the down-dip projection of the Sunshine deposit target models derived from historic Sunshine drilling
Note:All grades are reported uncut for all zones
Figure 1: Sunshine Drill Pad Locations
Click Image To View Full Size
Figure 2: Sunshine Section A Showing SS23-07 in Relation to Historic Drill Intercepts
Click Image To View Full Size
Quality Assurance
Jervois sent all drill core samples to
Jervois employs a regimented Quality Assurance, Quality Control (“QA/QC”) program where at least 10% duplicates, blanks and certified reference material are inserted into each sample shipment.
On behalf of
For further information, please contact:
Investors and analysts: Group Manager External Affairs Jervois GlobalLimited alicia.brown@jervoisglobal.com | Media: nathan.ryan@nwrcommunications.com.au Mob: +61 420 582 887 |
Competent Person’s Statement
The information in this release that relates to Mineral Exploration is based on information compiled by
Qualified Person’s Statement
The technical content of this news release has been reviewed and approved by
Forward-Looking Statements
This news release may contain certain “Forward-Looking Statements” within the meaning of the United States Private Securities Litigation Reform Act of 1995 and applicable Canadian securities laws. When used in this news release, the words “anticipate”, “believe”, “estimate”, “expect”, “target, “plan”, “forecast”, “may”, “schedule”, “expected” and other similar words or expressions identify forward-looking statements or information. These forward-looking statements or information may relate to the timing of drilling operations at ICO, the outcome of the drilling program, timing of an updated resource model and certain other factors or information. Such statements represent Jervois’ current views with respect to future events and are necessarily based upon a number of assumptions and estimates that, while considered reasonable by Jervois, are inherently subject to significant business, economic, competitive, political and social risks, contingencies and uncertainties. Many factors, both known and unknown, could cause results, performance or achievements to be materially different from the results, performance or achievements that are or may be expressed or implied by such forward-looking statements. Jervois does not intend, and does not assume any obligation, to update these forward-looking statements or information to reflect changes in assumptions or changes in circumstances or any other events affections such statements and information other than as required by applicable laws, rules and regulations.
Neither
Appendix 1:
JORC Code, 2012 Edition – Table 1
Section 1 Sampling Techniques and Data
Criteria | JORC Code explanation | Commentary |
Sampling techniques |
|
All drill core was sampled contingent on geology and core recovery: Core was collected directly from the core barrel into core boxes, and drill core was cut in half by diamond saw, with one half of the core collected for laboratory analysis and the other half retained as reference core in the tray. Core trays were clearly labelled with the hole number, tray number and depth intervals marked. A “cut-line” was drawn by the logging geologists along the length of the drill core as a guide for the core sawing. The half-core was sampled, ensuring that the same side is consistently sampled, and placed into sample bags labelled with the assigned sample number. Downhole measurements are recorded using a Reflex OMNI Gyro at 30 metre intervals down each hole and at 1.5 metre intervals continuously at the end of every hole. Field sampling followed Jervois protocols including industry standard quality control procedures. Samples were sent to:ALS Geochemistry-Vancouver, an independent and fully accredited laboratory in
Handheld XRF instruments were used to spot check drill core for mineralization, however those results were not relied on. All sample results reported on are fromALS, an independent laboratory. All of the drilling was diamond drill core (HQ/NQ). Typically, drill core was sampled on nominal 3 foot (~1m) half core samples for HQ/NQ. All sample analyses were completed at ALS. ALS operates independent laboratories globally, which are ISO accredited. Samples are received at the laboratory: Bar codes are scanned and logged; samples are weighed and dried; samples are crushed to 70% less than 2mm, the crushing product is riffle split to collect a 250g split, which is pulverized to better than 85% passing 75 microns; aliquots from the pulverized split (the sample “pulp”) are analysed for 34 elements using ICP analysis and for gold by 30 gram Fire Assay with ICP-AES finish. Any samples with initial “over-limit” results for specific metals, including gold, copper, cobalt and arsenic are re-analysed accordingly to achieve complete results. |
Drilling techniques |
| The 2023 surface drilling comprised HQ sized core. Holes were generally angled from -55 to -90 degrees at varying azimuths. |
Drill sample recovery |
| All holes are logged for basic geotechnical characteristics including measurements and calculations for core recovery and RQD values. Core recovery is recorded as a percentage equivalent to the length of core recovered, as a percentage of the drill run (interval length). Excellent recoveries were obtained from the 2023 diamond drilling. There is no bias noted between sample recovery and grade. Excellent recoveries were obtained from Diamond drilling other than in faulted zones which were not sampled. |
Logging |
| Diamond drilling: Drill core is photographed and logged prior to sampling; Core has been geologically and geotechnically logged to a level of detail appropriate to support mineral resource estimation and mining studies. Logging has been conducted both qualitatively and quantitatively; full description of lithologies, alteration and comments are noted, as well as percentage estimates on veining and sulphides. The total length of all Sunshine holes drilled in 2023 was 1,263m. All depths of relevance to this release are listed in the table in the body of the text. All drill holes are logged in their entirety. |
Sub-sampling techniques and sample preparation |
| All core was half-cut lengthwise using a diamond saw. The HQ/NQ core half-core was sampled. Samples are received at the laboratory: sample ID bar codes are scanned and logged; samples are weighed and dried; samples are crushed to 70% less than 2mm, the crushing product is riffle split to collect a 250g split, which ispulverized to better than 85% passing 75 microns; aliquots from the pulverized split (the sample “pulp”) are analysed for 34 elements using ICP analysis and for gold by 30 gram Fire Assay with ICP-AES finish. Any samples with initial “over-limit” results for specific metals, including gold, copper, cobalt and arsenic are re-analysed accordingly to achieve complete results. For core sampling the same side is consistently sampled, half-core is retained in the tray for HQ/NQ. The assay sub- sample is placed into sample bags labelled with the assigned sample number. One in 20 samples is duplicated where the core is quartered and a quarter cut sample is analysed as a duplicate. The remaining quarter samples is retained in the tray. Sample sizes of 2-3 kg are appropriate for the grain size of material. The sample preparation technique and sample sizes are considered appropriate to the material being sampled. |
Quality of assay data and laboratory tests |
| The ICP-AES and Fire Assay (30 gram) analytical techniques are considered total and are high quality and appropriate for the mineralization being tested. Jervois has a regimented Quality Control protocol which has consisted of systematic submission of blanks, standards and duplicates in addition to those conducted at the laboratory. Precision levels for all blanks, standards and duplicate samples fell within acceptable ranges. |
Verification of sampling and assaying |
| Significant intersections are alternatively verified by the CP and QP of the company. No holes have been twinned in this drill programme. Data is collected using a PostGRE SQL database custom-built for Idaho Cobalt Operations and incorporates historic MS Excel templated data. The database software includes data validation algorithms. The database software also allows for the direct importation of digital data files from the laboratory. Data is backed up on the cloud hosted server on and off site. All assay/analytical data returning “below detection limit” results have been entered in the project database as one half of the detection limit value. Samples received damaged at the laboratory, or with insufficient sample weight for analysis had the interval or location left blank. |
Location of data points |
| All surface drilling collars were surveyed by licensed surveyors. Down-hole surveys were routinely carried out on all holes using a Reflex OMNI Gyro at 30 metre intervals down each hole and at 1.5 metre intervals continuously at the end of every hole. Holes were setup on collar using a Reflex TN14 Gyro. All datum is collected and recorded in a localized ICO Mine Grid. The 3D location of the individual samples is considered to be adequately established, consistent with accepted industry standards. |
Data spacing anddistribution |
| Data spacing is considered adequate for the purpose of the program. Theprogram’s intent was to verify historic datasets with the intention of validating historic drilling spatially and for grade using modern techniques. The intervals released are within the existing Sunshine deposit Historic MRE and are interpreted as defining geological continuity within the various mineralization horizons. As a result, this data will be used in a planned mineral resource update later this year. The reported drillhole data comprises length-weight averaged core interval grade values. Data compositing is completed during Mineral Resource Estimation, but has not been applied to the data reported in this release. |
Orientation of data in relation to geological structure |
| Drilling sections are orientated perpendicular to the strike of the host rocks where practicable and moderately oblique where drill access is limited. Drill holes were inclined between -55° and -90° to optimize intercepts of mineralisation with respect to thickness and distribution. Drilling with angled holes in most instances provides a representative sample across the stratigraphy. |
Sample security |
| All individual samples are placed in plastic sample bags sealed with a cable tie. Then groups of samples are bagged in poly-woven sacks also sealed with a cable tie. The samples are sent by courier to the lab and tracked. To date, no sample shipments have had reported problems and/or a breach in security. |
Audits or reviews |
| Jervois protocols consist of a regimented internal QA/QC which match or exceed global industry standards. |
Section 2 Reporting of Exploration Results
Criteria | JORC Code explanation | Commentary |
Mineral tenement and land tenure status |
| ICO consists of 358 unpatented mineral claims totalling 2990 hectares (7390 acres). The claims are 100% owned by Jervois subsidiary Unpatented Mineral Claims: Ownership of unpatented mining claims in the There are no known encumbrances. |
Exploration done by other parties |
| The ICO came under Jervois management following the merger with eCobalt in 2019. Prior to this merger, the area has a long history of copper and cobalt exploration and mining. Copper mineralization in the |
Geology |
| Deposit Types: Whilst the deposits in the Idaho Cobalt Belt have been studied over many years the deposit types are still a subject of debate. Prior to 2005 the overriding opinion was that the deposits are sedimentary exhalative and are referred to as the Post 2005 the discovery of high concentrations of rare earth elements (“REE”) lead to the postulation that the deposits are not volcanogenic massive sulphide or sedimentary exhalative deposits but instead are iron oxide-copper-gold (“IOCG”) deposits. Geological Setting: The ICO is situated in the Idaho Cobalt Belt, a 50- to 55-kilometre long metallogenic district characterized by stratiform/tabular copper-cobalt deposits. The deposits are hosted by a thick, dominantly clastic sequence of Middle Proterozoic age sandwiched between late Proterozoic quartz monzonitic intrusions. The clastic sediments were deposited in a large fault-bounded basin, probably as large submarine fan complexes and/or deltaic aprons that were frequently “drowned” by continuing subsidence within the basin. All significant copper-cobalt deposits and occurrences are found in the Proterozoic Apple Creek Formation, which constitutes the base of this sequence. This formation was originally correlated with Pritchard Formationmetasediments of the Belt supergroup to the north, its age being constrained by dates of 1.37 Ga for adamellites intruding the sequence and 1.7 Ga from mafic dykes and sills emplaced along the basin margin faults. The structure of the Apple Creek Formation is dominated by the regional rift structure. Cobalt-copper-gold mineralization occurs along a northwest-southeast trending structure parallel to and west of the central axis of the rift. There is a series of northerly trending faults that are considered to represent initial growth faults, reactivated by Laramide and younger events. The district has also been affected by north-easterly structures of the The ICO is hosted in Proterozoic age meta-sediments found on the east side of the central Idaho Batholith comprising granitic-to-granodioritic rocks. The Idaho Cobalt Belt represents a distinct district dominated by stratabound cobalt + copper ± gold mineralization, with a remobilized constituent. The district is underlain by strata of the middle Proterozoic-age Apple Creek Formation, which is an upward-thickening, upward-coarsening clastic sequence at least 14,900 metre thick that represents a major basin-filling episode and was formerly considered part of the Yellow Jacket Formation. Mafic tuffs within the Apple Creek Formation are the oldest igneous rocks exposed in the Sunshine-Blackpine district. They are accompanied by felsic tuffs and carbonatitic tuffs. Some mafic dikes and sills intrude the Apple Creek Formation and may be comagmatic with the mafic tuff beds. Several small lamproitic diatremes may also be coeval with mafic volcanism. The Apple Creek Formation has undergone varying degrees of regionalmetamorphism, ranging from greenschist facies in the southern part of the district to amphibolite grade facies in the northern part of the district. Several types of mafic dikes and sills, ranging from 1m to 30m thick, intrude the Apple Creek Formation and are interpreted as feeders to the exhalative mafic tuffs, which are most abundant in areas of intrusive activity. Style of Mineralization: Mineralization at the ICO is characterized as syngenetic, stratiform/tabular exhalative deposits within, or closely associated with, the mafic sequences of the Apple Creek Formation. This mineralization is dominantly bedding concordant and the deposits range from nearly massive to disseminated. Some crosscutting mineralization is present that may be in feeder zones to the stratiform mineralization or may be due to remobilization locally into fracture quartz veins and/or crosscutting structures. Dominant minerals include cobaltite (CoAsS) and chalcopyrite (CuFeS2), with lesser, variable occurrences of gold. Other minerals present in small quantities are pyrite (FeS2), pyrrhotite ( Recently, rare-earth minerals have been identified in samples from the deposit as monazite, xenotime and allanite. At this time, these minerals have not been considered for potential recovery as by-products of the Co-(Cu-Au). The RAM is the largest and best-known deposit in the ICO area. It consists of a |
Drill hole Information |
| Exploration data for all drillholes pertinent to this release has been present within the body of this release with coordinates provided in the local ICO mine grid coordinate system. |
Data aggregation methods |
| In previous reports weighted averaging has been used in reported composite intervals and individual results are also listed, no grade truncations etc. has been used. Aggregate intercepts are reported using a grade metre calculation. For example: ((assay x meter interval sampled) + (assay x meter interval sampled) + (assay x meter interval sampled) / divided by total number of meters in the interval). Calculated true widths determined for the composited intercept mid-point, perpendicular to the down-dip projection of the Sunshine deposit target models derived from historic Sunshine drilling. No metal equivalent values have been reported. |
Relationship between mineralisation widths and intercept lengths |
| Downhole lengths and calculated true width lengths are both reported. |
Diagrams |
| Refer to figures and tables in the body of the text. |
Balanced reporting |
| Calculated true widths determined and reported for all composited intercept mid-points, perpendicular to the projection of the Sunshine deposit target models derived from historic Sunshine drilling, have been reported for the program. |
Other substantive exploration data |
| There is no other substantive exploration data. |
Further work |
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Copyright (c) 2024 TheNewswire - All rights reserved., source