Phase 2 air core drill program targeting large-scale high-grade gold discoveries
Highlights
~24,500m Phase 2 reconnaissance air core (AC) drill program to commence in late September.
The same high capacity, multi-purpose AC/RC rig from Phase 1 has been contracted.
Drilling follows on from the Phase 1 program which successfully defined three large-scale areas of gold and pathfinder anomalism in basement under shallow Murray Basin cover.
7,500m planned at the Ironbark Target:
Phase 1 drilling intersected up to 1.1g/t Au in quartz veining within a ~380m diameter diorite intrusion;
Petrological studies on the intrusive confirmed it as a highly prospective mineralised diorite, pointing to a potential high-grade Walhalla-Woods Point style target;
The historical Walhalla-Woods Point goldfield in the Melbourne Zone hosted several high-grade diorite related gold deposits including Cohen's Reef (~1.5Moz @ ~32g/t Au), Morning Star (~800koz @ ~26g/t Au) and A1 (~620koz @ ~32g/t Au);
The diorite intrusion intersected at Ironbark is interpreted to be much larger than the smaller diorite dykes at Walhalla-Woods Point, based on regional aeromagnetics
Step-out drilling planned on the diorite as well as on a second identified magnetic anomaly to refine the target for deeper RC/diamond drilling.
10,500m planned at the Karri Target:
Phase 1 drilling returned several wide-spaced, shallow gold intersections up to 0.66g/t Au over ~15km of strike;
Step-out drilling planned on 1km spaced lines and 100-200m spaced holes to refine the target for infill and deeper drilling.
4,000m planned at the Beech Target:
Phase 1 drilling intersected highly anomalous pathfinder elements in basement ~25km north-west of Bendigo (~22Moz @ ~15g/t Au) along the Sebastian Fault;
Step-out drilling planned on 1-2km spaced lines and 100-200m spaced holes to refine the target for infill drilling.
A further 2,500m is planned regionally within the ~1,470km2 Muckleford Area.
All statutory approvals received and all land access agreements in place.
Chalice holds a commanding ~5,140km2 land position in this exciting under-explored region.
Strong cash and investments balance of ~A$33 million (A$0.12 per share) ensures Chalice is well funded to progress its large-scale systematic exploration program.
PERTH, Western Australia, Sept. 2, 2019 /CNW/ - Chalice Gold Mines Limited ("Chalice" or "the Company") (ASX: CHN| TSX: CXN | OTCQB: CGMLF) is pleased to announce that it is scheduled to commence the second phase of reconnaissance air-core (AC) drilling at the Pyramid Hill Gold Project in the Bendigo Region of Victoria in late September 2019. All statutory approvals have now been received and all relevant access agreements are in place.
Figure 1 Muckleford Area AC drilling and regional gold occurrences over 1VD gravity geophysics (CNW Group/Chalice Gold Mines Limited)
Figure 2 Ironbark Target cross section C-D and drill cuttings from drillhole PA245 (CNW Group/Chalice Gold Mines Limited)
Figure 3 Ironbark Target AC drilling over 1VD RTP aeromagnetics (CNW Group/Chalice Gold Mines Limited)
Figure 4 Karri Target AC drilling over 1VD gravity geophysics (CNW Group/Chalice Gold Mines Limited)
Figure 5 Pyramid Hill Gold Project tenure, regional land holders, gold deposits and occurrences (CNW Group/Chalice Gold Mines Limited)
Figure 6 Pyramid Hill Gold Project tenure, regional gold deposits and occurrences over regional geology (CNW Group/Chalice Gold Mines Limited)
The Phase 2, ~24,500m AC drill program is designed to refine the Ironbark, Karri and Beech Targets defined in Phase 1, in order to maximise the effectiveness of future deeper RC or diamond drilling. The same high-capacity, multi-purpose AC/RC drilling rig used in Phase 1 has been contracted. Several additional regional geochemical and geophysical target areas of interest will also be drilled (Figure 1).
Commenting on the upcoming drilling, Chalice's Managing Director, Alex Dorsch, said: "The three targets generated in the first phase of drilling have the right scale and geological potential for multiple large-scale gold discoveries. We are particularly intrigued by the diorite intrusion at the Ironbark Target, which is highly unusual for the Bendigo Zone and potentially presents a new target style for this area with similarities to the high-grade Walhalla-Woods Point Goldfield in Eastern Victoria."
"The upcoming phase of AC drilling is designed to further refine the target footprints and provide valuable geochemical and geological data which will be used to systematically vector in towards potential deeper primary gold lodes."
"Importantly, we have been able to secure all the necessary approvals and land access to complete the next phase of drilling and we will continue to work closely with all land-owners and the local community."
"Chalice is in a strong position ahead of this next phase of drilling, having the financial resources to explore systematically at scale in this high grade but virtually unexplored gold province. We look forward to reporting results from drilling over the next few months."
Ironbark Target
A total of ~70 AC drill holes (~7,500m) are planned at the Ironbark Target, which is centred around a large 10km by up to 7km >5ppb gold-in-soil anomaly. The soil anomaly has a peak of 276ppb Au and, importantly, also has associated pathfinder metals. The target is situated between the regional-scale Muckleford Fault and the Wedderburn Granodiorite.
Broad gold anomalism above 25ppb Au and up to 1.1g/t Au was intersected in the Phase 1 drill program along a 650m section of the central drill line. Three consecutive holes ~100m apart intersected a mafic intrusive, with a best result of 5m @ 0.45g/t Au including 1m @ 1.1g/t Au associated with quartz veining (Figure 2).
Petrological examination of these drill cuttings has confirmed the presence of a hornblende-biotite-quartz diorite, similar to the Walhalla-Woods Point dyke swarm. This historical goldfield in Eastern Victoria hosted several significant gold deposits including Cohen's Reef (~1.5Moz @ ~32g/t Au), Morning Star (~800koz @ 26g/t Au) and A1 (~620koz @ 32g/t Au), all related to small diorite dyke intrusions.
Further technical information on this district is provided in Appendix 1.
Regional aeromagnetics suggest that the diorite intrusive intersected in the Phase 1 AC drilling at Ironbark is a circular magnetic body ~380m in diameter, making it much larger and a different (and potentially more favourable) geometry to the dykes at Walhalla-Woods Point.
The aeromagnetics also indicate a potential second untested discrete bulls-eye magnetic anomaly and several potentially prospective diorite dykes in the area. The bulls-eye anomaly ~2km to the north-west represents a prospective additional target for Phase 2 drilling (Figure 3).
A high definition 25m-line spaced ground magnetic survey is planned over both magnetic anomalies to refine targeting for the next phase of deeper drilling. The planned Phase 2 holes will systematically test the weathered top of the intrusive targets, at a nominal 100-250m hole spacing, while also providing a first-pass test of several other nearby structural targets.
Karri Target
A total of ~90 AC drill holes (~10,500m) are planned at the Karri Target, which includes an ~350m wide, north-south striking zone of elevated gold and pathfinder elements (including Sb, Hg, Te, Bi, Zn, Cu and As) on Phase 1 AC lines ~7km apart. This 7km of strike between lines remains entirely untested by drilling.
Better results from Phase 1 include 16m @ 0.15g/t Au from 62m within a 350m wide zone of anomalous gold (>25ppb Au), interpreted to be a secondary supergene dispersion zone near the weathered top of the Castlemaine Group sediments. Based on limited drilling thus far, Karri is interpreted to be a classic Bendigo Zone-style target (flat-lying, shallow doubly plunging anticlinal stacked lode system, in the hanging wall of a regional scale, steep westerly dipping fault). Given the strike extensiveness of the gold anomalism identified to date at the top of weathered basement, it is considered to have significant scale potential.
The planned Phase 2 holes will systematically test the Karri Target at a nominal 1km drill line spacing and 100-200m drill hole spacing (Figure 4). The drilling is designed to further refine the footprint of gold anomalism, in order to vector towards the bedrock source with future infill and deeper drilling.
Beech Target
A total of ~35 AC holes for ~4,000m are proposed at the Beech Target, where Phase 1 AC results included arsenic (As) anomalism up to 8,500ppm and associated antimony (Sb) up to 40ppm in hole PA136, which is the strongest As intercept to date on the project. Arsenic and antimony are considered the strongest pathfinder metals for gold in the Bendigo Zone.
The Beech Target is located ~25km along strike from Bendigo (22Moz @ ~15g/t Au) on the Sebastian Fault, and is broadly associated with carbonate alteration and low-level gold anomalism.
The planned Phase 2 holes will systematically test the Beech Target on a nominal 1-2km drill line spacing and 100-200m drill hole spacing. The drilling is designed to define the footprint of gold anomalism for future infill drilling.
Additional Reconnaissance Drilling
Approximately 28 holes for ~2,500m are also planned as a first-pass shallow test of other regional targets in the Muckleford Area (in a similar manner to the Phase 1 program). Several isolated holes in the central part of the Muckleford Area are planned on gravity highs (interpreted basement highs) below Murray Basin and Permian tillite cover, where limited historical drilling has been unable to successfully establish depth to the target Castlemaine Group basement.
Several reconnaissance AC drill lines in the southern part of the Muckleford Area are also planned as a first-pass shallow test of three areas of anomalous arsenic in soils.
Sampling Techniques and JORC 2012
The information in this release that relates to the exploration results for the Pyramid Hill Project is extracted from the ASX announcements entitled "Chalice identifies two 12km+ gold-in-soil anomalies at Pyramid Hill Project, Bendigo", "Reconnaissance Drilling at Pyramid Hill Gold Project Continues to Outline High-Priority Target Areas" and "Shallow drilling hits gold in basement and outlines three high priority targets for follow-up at the Pyramid Hill Gold Project, Victoria" dated 12 July 2018, 19 March 2019 and 8 July 2019.
The above announcements are available to view on the Company's website at www.chalicegold.com. The Company confirms that it is not aware of any new information or data that materially affects the information included in the relevant original market announcements. The Company confirms that the form and context in which the Competent Person and Qualified Person's findings are presented have not been materially modified from the relevant original market announcements.
About the Pyramid Hill Gold Project, Victoria, Australia
The 100%-owned Pyramid Hill Gold Project was staked in 2017 and now covers an area of ~5,140km2 in the Bendigo region of Victoria. The Project comprises three key districts within the Murray Basin covered North Bendigo and North Stawell Zones: Muckleford, Mt William and Percydale (Figure 5).
The central Muckleford Area extends to the north-west of the high-grade historic >22Moz Bendigo Goldfield. The Mt William Area extends to the north-east of one of the world's highest-grade producing gold mines, the >8Moz Fosterville Gold Mine owned by Kirkland Lake Gold (NYSE /TSX: KL | ASX: KLA). The Percydale Area is located north-west of the historical St Arnaud Goldfield within the Stawell Zone.
The 'Gold Undercover' initiative by the Victorian Government estimated a potential ~32Moz (P50) of undiscovered gold beneath Murray Basin cover in the Bendigo Zone, where Chalice holds ~60% of the total ~7,000km2 prospective area (Figure 6).
Chalice is targeting large-scale, high-grade gold deposits, and is currently conducting regional scale greenfield exploration. ~39km of reconnaissance aircore (AC) drilling has been completed to date.
Appendix 1: Walhalla-Woods Point Goldfield Technical Overview
The Walhalla-Woods Point Goldfield is located approximately 125km east of Melbourne, in the Melbourne Geological Zone. While the majority of gold deposits in the Walhalla-Woods Point Goldfield are sediment hosted, the highest yielding and most significant deposits are classified as either "dyke-associated" or "dyke-hosted" (Hough, M. A. et. al 2010).
Gold Deposit
Area
Dyke
Relationship
Dyke Host Rock
Deposit Size and Grade
Approximate Dimensions
Cohens Reef
Walhalla
Dyke- associated
Hornblende Diorite
1.48Moz @ 32.2g/t Au
1500m long, 3m wide, 1134m deep
Morning Star
Woods Point
Dyke-hosted
Hornblende Diorite - Gabbro
~800koz @ 26g/t Au
400m long, 120m wide, 800m deep
A1
Woods Point
Dyke-hosted
Diorite
~620koz @ 32g/t Au
150m long, 45m wide, 700m deep
The dykes are often differentiated and typically exhibit intermediate (diorite) to mafic (gabbro) compositions.
While gold mineralisation is known to closely post-date dyke emplacement in the range of ~2-4 million years (Jowitt, M. et. al 2012), the high-grade gold association with the dykes is understood to be due to greater chemical reactivity and rheological contrasts between the dykes and surrounding metasedimentary rocks.
Following dyke emplacement, deformation faulted and fractured the dykes producing pathways for the auriferous (gold-bearing) mineralising fluids. These hydrothermal fluids likely used the same lithospheric structures used to emplace the pre-existing dykes.
The "dyke-hosted" deposits (e.g. Morning Star and A1) typically occur where dykes bulge and thicken along strike and are hosted by auriferous quartz veins developed in reverse faults that cross-cut the dykes forming a vertical 'ladder vein' network or in quartz veins sub-parallel to the strike of the dykes themselves.
The quartz veins frequently cross the entire dykes but only persist for short distances, if at all, into the neighbouring metasedimentary country rocks. The highest gold grades (>1500g/t Au) typically occur within 20-30cm wide laminated quartz veins (Jowitt, M. et. al 2012) associated with repeated activation and precipitation of gold fluids along fault structures, with grades recognised to generally increase with deposit depth.
These high-grade gold reefs are commonly associated with hydrothermal sulphides, in particular arsenopyrite, and display alteration halos dominated by ankerite, sericite, chlorite, fuchsite and pyrite which also commonly contain low grade gold (<1g/t Au).
The "dyke-associated" deposits in contrast (e.g. Cohens Reef) are typically hosted within narrow shear zones (<20m width) located along the margins of narrow dykes with massive to laminated auriferous quartz veining developed throughout the shear zone. Whilst narrow, the Cohens Reef deposit is relatively large (1.48Moz Au) and strike extensive.
Competent Persons and Qualifying Persons Statement
The information in this release that relates to Exploration Results in relation to the Pyramid Hill Gold Project is based on information compiled by Dr. Kevin Frost BSc (Hons), PhD, a Competent Person, who is a Member of the Australian Institute of Geoscientists. Dr. Frost is a full-time employee of the company and has sufficient experience that is relevant to the activity being undertaken to qualify as a Competent Person as defined in the 2012 edition of the Australasian Code for Reporting of Exploration Results, Minerals Resources and Ore Reserves, and is a Qualified Person under National Instrument 43-101 – 'Standards of Disclosure for Mineral Projects'. The Qualified Person has verified the data disclosed in this release, including sampling, analytical and test data underlying the information contained in this release. Dr. Frost consents to the inclusion in the release of the matters based on his information in the form and context in which it appears.
Forward Looking Statements
This release may contain forward-looking information within the meaning of Canadian securities legislation and forward-looking statements within the meaning of the United States Private Securities Litigation Reform Act of 1995 (collectively, forward-looking statements). These forward-looking statements are made as of the date of this report and Chalice Gold Mines Limited (the Company) does not intend, and does not assume any obligation, to update these forward-looking statements.
Forward-looking statements relate to future events or future performance and reflect Company management's expectations or beliefs regarding future events and include, but are not limited to, the Company's strategy, the likelihood of exploration success at the Pyramid Hill Project (Project), the prospectivity of the Project, the timing of future exploration activities on the Project, planned expenditures and budgets and the execution thereof, the timing and availability of drill results, potential sites for drilling and execution of additional drilling, environmental risks, unanticipated reclamation expenses, title disputes or claims.
In certain cases, forward-looking statements can be identified by the use of words such as "plans", "planning" "expects" or "does not expect", "is expected", "will", "may", "could", "would", "potential", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates" or "does not anticipate", "believes", "occur" or "be achieved" or variations of such words and phrases or statements that certain actions, events or results may, could, would, might or will be taken, occur or be achieved or the negative of these terms or comparable terminology. By their very nature forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the Company to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements.
Such factors may include, among others, risks related to actual results of current or planned exploration activities; changes in project parameters as plans continue to be refined; changes in exploration programs based upon the results of exploration; accidents, labour disputes and other risks of the mining and exploration industry; delays in obtaining governmental approvals; as well as those factors detailed from time to time in the Company's interim and annual financial statements, all of which are filed and available for review on SEDAR at sedar.com on ASX at asx.com.au and OTC Markets at otcmarkets.com.
Although the Company has attempted to identify important factors that could cause actual actions, events or results to differ materially from those described in forward-looking statements, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that forward-looking statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements.
SOURCE Chalice Gold Mines Limited
please visit chalicegold.com or contact: Nicholas Read, Principal and Managing Director, Read Corporate Investor Relations, +61 8 9388 1474, [email protected]; Alex Dorsch, Managing Director, Chalice Gold Mines Limited, +61 8 9322 3960, [email protected]
Share this article