Heron Resources Limited
ASX/TSX Release
18 February 2015
Level 1, 37 Ord Street, West Perth WA 6005 [email protected] +61 8 9215 4444
ABN: 30 068 263 098
Woodlawn Drilling Update - High Grade Results from new
Lisa Lens
Results (Lisa Lens):
Significant intercept 4.2m @ 17.7% Zn, 1.6% Cu, 5.0% Pb, 1.1g/t Au, 28g/t Ag from 246m depth (WNDD0015)
Preliminary DHEM modelling provides a robust target for future drilling
Drill Program Update:
ASX:HRR/TSX:HER Issued Shares 361M Share Price $0.145
Market Cap $52M
Cash (31 Dec 2014) $27.9M Investments $ 2.9M Total C+I $30.8M
First phase drill program is now completed with a total of 7,613m of Diamond core drilled in 20 holes.
Heron Resources Limited ("Heron" or the "Company") is pleased to report a significant intercept of high-grade massive sulphide grading approximately 18% Zn from the discovery hole drilled into the Lisa Lens.
These results form part of the highly successful 2014-15 drilling program that will delineate new Mineral Resources to contribute to the on-going Preliminary Economic Assessment (PEA) for the planned Woodlawn Underground Project.
The Phase I drill campaign has concluded with step-out holes being drilled to the north of the Kate Lens and directly to the south of the historic open-pit mine.
Woodlawn is a high-grade, volcanogenic massive-sulphide (VMS) deposit, wholly-owned by Heron and located approximately 50km northeast of Canberra and 250km southwest of Sydney, in New South Wales, Australia.
Assay Results
Assay results for Diamond drill hole (DDH) WNDD0015 confirm 18.3m of pyrite dominant massive-sulphides containing a significant polymetallic intercept of:
4.2m @ 17.7% Zn, 1.6% Cu, 5.0% Pb, 1.1g/t Au, 28g/t Ag from a depth of 246m
DDH WNDD0015 targeted a position directly to the north of two historic drill holes, W089 and W145, in an area postulated to contain an additional lens of mineralisation (Figure 1). The results of the historic holes include:
4.0m @ 4.9% Zn, 2.8% Cu, 2.3% Pb, 0.8g/t Au and 25g/t Ag from a 266m depth (W089)
4.0m @ 2.0% Cu from a 234m depth (W145)
The result in WNDD0015 is highly encouraging and demonstrates the potential for Woodlawn to host relatively shallow high- grade mineralisation analogous to that historically encountered in the idled underground.
Neighbouring DDH WNDD0017 targeted the predicted up-plunge direction of the new lens as follow-up to WNDD0015, however a late-stage dolerite intrusive body has displaced the target. DDH WNDD0017 was continued and intersected the D Lens, where an interval of 9.5m of massive sulphides was intersected (assays pending).
DHEM Surveys
Down-hole electro-magnetic (DHEM) surveying of WNDD0015 has been completed and preliminary modelling indicates good potential for extensions of the mineralisation both down-dip and along strike to the north and south. At this stage modelling suggests the centroid of the lens is positioned below the DDH WNDD0015 intercept, and explains the lack of mineralisation found in DDH WNDD0017 which penetrated the up-dip position. As shown in Figure 1, the modelled lens
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"plate" is smaller than the Kate Lens, but the excellent grade returned from WNDD0015 supports follow-up drilling. Lisa
Lens is located within 100m of existing underground development.
Figure 1: Plan overview of the Woodlawn Lenses showing pit and existing underground decline. The new Lisa Lens is shown in the top left hand corner.
Drilling Program Update
Phase I drilling at Woodlawn has now concluded. In addition to DDH WND 0015, DDH WNDD0018 tested the postulated northerly extension of the Kate Lens, and WNDD0020 was drilled to test at depth below the southern end of the Woodlawn pit where historic Jododex hole W024 intersected 15.7m grading 8.7% Zn, 0.9% Cu, 2.6% Pb, 1.0g/t Au and 71g/t Ag. There is limited follow up drilling in this area. The key results for these two holes are as follows:
WNDD0018 intersected 2.2m of semi-massive sulphides, with minor base-metal sulphides from a 370m down- hole depth, indicating a potential position proximal to the limit of the Kate Lens mineralisation in the northern direction towards D Lens.
WNDD0020 intersected a number of zones containing VMS-related moderate to intense sericite, quartz, pyrite alteration within the Woodlawn Volcanics, including a number of narrow (>1m) zones of remobilized zinc
mineralisation (sphalerite) in quartz veins.
DHEM is planned for both these holes to identify potential off-hole conductors.
The results from the drilling program support Mineral Resource modelling, providing a key input into the Preliminary
Economic Assessment due to be released in the first-half of 2015.
Full details of all holes drilled and assay results to date are provided in Tables 1 and 2 at the end of this report. The total Diamond metres for the first phase program was 7,613m in 20 holes. In addition, some 770m of Diamond drilling in 11 holes was undertaken for geotechnical assessment of the decline access route, which has now also been finalized.
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About Heron Resources Limited:
Heron is engaged in the exploration and development of base and precious metal deposits in Australia. Heron's projects include the high grade Woodlawn Zinc-Copper Project located 250km southwest of Sydney, New South Wales, and the Kalgoorlie Nickel Project located north of Kalgoorlie, Western Australia. In addition the Company holds a number of other high quality exploration properties located in the Lachlan Fold Belt, New South Wales.
For further information, please visit www.heronresources.com.au or contact: Australia:
Mr Wayne Taylor, Managing Director and Chief Executive Officer: Tel: +61 8 9215 4444
Email: [email protected]
Canada:
Tel: +1 905 727 8688 (Toronto)
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Technical Information
Table 1: Drill hole details for Diamond drill holes relevant to this update
Hole No
|
WMG East (m)
|
WMG North (m)
|
WMG RL (m)
|
Surface
Dip
|
WMG Surface
Azimuth
|
Depth (m)
|
Target
|
WNDD0001
|
8,995
|
19,402
|
2,793
|
-65.0
|
88.0
|
425.5
|
Kate Lens
|
WNDD0002
|
9,011
|
19,400
|
2,793
|
-58.2
|
95.1
|
434.5
|
Kate Lens
|
WNDD0003
|
8,996
|
19,402
|
2,793
|
-71.1
|
88.8
|
463.2
|
Kate Lens
|
WNDD0004
|
8,977
|
19,637
|
2,786
|
-70.4
|
86.0
|
272.5
|
I Lens (up-dip)
|
WNDD0005
|
8,976
|
19,638
|
2,787
|
-65.3
|
78.7
|
263.6
|
I Lens (up-dip)
|
WNDD0006
|
8,548
|
19,749
|
2,787
|
-70.0
|
96.8
|
95.2
|
I/I2/D Lens (down-dip)
|
WNDD0007
|
8,997
|
19,350
|
2,792
|
-60.0
|
91.0
|
580.6
|
Kate Lens
|
WNDD0008
|
8,969
|
19,353
|
2,791
|
-68.1
|
88.6
|
469.1
|
Kate Lens
|
WNDD0009
|
9,155
|
19,342
|
2,793
|
-76.9
|
80.9
|
480.2
|
G Lens & Kate Lens
|
WNDD0010
|
9,151
|
19,302
|
2,791
|
-78.6
|
80.2
|
377.0
|
G Lens & Kate Lens
|
WNDD0011
|
8,995
|
19,402
|
2,793
|
-65.0
|
80.5
|
454.0
|
Kate Lens
|
WNDD0012
|
9,299
|
19,282
|
2,801
|
-62
|
87.0
|
189.2
|
E Lens
|
WNDD0013
|
9,249
|
19,309
|
2,798
|
-58
|
82.0
|
120.0
|
G Lens
|
WNDD0014
|
9,280
|
19,290
|
2,793
|
-60
|
73.2
|
80.0
|
G Lens
|
WNDD0015
|
9,014
|
19,601
|
2,780
|
-60
|
99.0
|
279.2
|
Lisa Lens
|
WNDD0016
|
8,973
|
19,353
|
2,780
|
-60
|
99.5
|
471.4
|
Kate Lens
|
WNDD0017
|
9,094
|
19,523
|
2,788
|
-74
|
72.8
|
310.8
|
Lisa and D Lenses
|
WNDD0018
|
8,994
|
19,403
|
2,792
|
-63.1
|
70.6
|
420.6
|
Kate Lens
|
WNDD0019
|
9,407
|
18,950
|
2,823
|
-55.0
|
77.8
|
55.0
|
South Target Aband.
|
WNDD0020
|
9,407
|
18,951
|
2,823
|
-57.6
|
73.6
|
479.7
|
South Target
|
Notes: WMG = Woodlawn Mine Grid
Table 2: Details of massive sulphide intercepts and reported grades from current Heron campaign
Hole No
|
From (m)
|
To (m)
|
Downhole
Width (m)
|
Estimated
True Width (m)
|
Zn (% )
|
Cu (% )
|
Pb (%
|
Au (g/t)
|
Ag (g/t)
|
WNDD0001*
|
373.6
|
388.0
|
14.4
|
11.5
|
4.6
|
4.1
|
0.8
|
1.0
|
56.8
|
WNDD0002*
|
368.0
|
370.3
|
2.3
|
1.9
|
12.0
|
0.6
|
5.4
|
1.3
|
116
|
WNDD0002*
|
374.0
|
382.7
|
8.8
|
7.2
|
12.6
|
1.6
|
7.5
|
2.3
|
152
|
WNDD0006*
|
626.1
|
631.8
|
5.6
|
4.5
|
13.3
|
0.7
|
5.4
|
1.2
|
25.9
|
WNDD0006*
|
679.0
|
683.0
|
4.0
|
3.2
|
4.8
|
0.5
|
0.2
|
0.0
|
14.5
|
WNDD0006*
|
699.4
|
707.4
|
8.1
|
6.5
|
3.0
|
2.3
|
3.1
|
2.6
|
68.8
|
WNDD0006*
|
759.0
|
769.0
|
10.0
|
8.0
|
1.6
|
1.7
|
0.2
|
0.2
|
15.3
|
WNDD0007*
|
414.3
|
426.6
|
12.3
|
9.8
|
20.0
|
2.1
|
6.1
|
0.8
|
52.9
|
WNDD0007*
|
434.7
|
437.1
|
2.4
|
1.9
|
20.1
|
1.6
|
4.2
|
2.1
|
39.7
|
WNDD0008*
|
434.0
|
439.4
|
5.4
|
4.3
|
11.1
|
1.6
|
0.8
|
0.6
|
11.4
|
WNDD0009*
|
198.0
|
214.8
|
14.8
|
8.9
|
5.4
|
2.7
|
2.0
|
1.2
|
48.5
|
WNDD0009*
|
308.7
|
316.8
|
8.1
|
6.5
|
7.2
|
1.1
|
2.3
|
0.9
|
28
|
WNDD0010*
|
206.0
|
210.4
|
4.4
|
3.5
|
4.1
|
3.2
|
0.9
|
2.6
|
39
|
WNDD0010*
|
353.0
|
354.0
|
1.0
|
0.8
|
0.0
|
1.6
|
0.0
|
0.0
|
1.1
|
WNDD0010*
|
360.0
|
361.1
|
1.0
|
0.8
|
0.1
|
1.6
|
0.0
|
0.2
|
4.5
|
WNDD0010*
|
365.0
|
366.0
|
1.0
|
0.8
|
0.1
|
1.6
|
0.0
|
0.0
|
3.5
|
WNDD0011*
|
348.2
|
354.1
|
5.9
|
4.7
|
6.3
|
3.20
|
1.7
|
1.3
|
73.5
|
WNDD0012*
|
74
|
79.8
|
5.8
|
4.6
|
3.6
|
0.70
|
1.5
|
1
|
60.4
|
WNDD0012*
|
135.1
|
139.3
|
4.2
|
3.4
|
14.8
|
2.20
|
6.2
|
0.7
|
37.2
|
WNDD0013*
|
76.2
|
85.6
|
9.3
|
5.6
|
6.4
|
3.20
|
2.8
|
2.4
|
150
|
WNDD0014*
|
61.2
|
63.3
|
2.1
|
1.7
|
3.1
|
6.5
|
1.3
|
1.2
|
146
|
WNDD0015
|
241.9
|
246.2
|
4.2
|
3.4
|
17.7
|
1.6
|
5.0
|
1.1
|
28
|
WNRC0010*
|
37.0
|
45.0
|
8
|
6.4
|
3.6
|
1.3
|
2.6
|
1.0
|
65.4
|
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Notes: True width is an estimate of the actual thickness of the intercept based on interpreted lens orientation (approximately 80% of downhole width); grades are weighted average grades, weighted by length of samples intervals downhole, which are nominally 1 metre. No weighting was applied for differences in specific gravity. * Previously reported results.
Compliance Statement (JORC 2012 and NI43-101)
The technical information in this news release relating to the exploration results at the Woodlawn Project is based on informatio n compiled by Mr David von Perger, who is a Member of the Australian Institute of Mining and Metallurgy (Chartered Professional - Geology). Mr von Perger is a full time employee of Heron Resources Limited and has sufficient experience, which is relevant to the style of mineralization and type of deposit under consideration and to the activity which he is undertaking to qualify as a Co mpetent Person as defined in the 2012 edition of the "Australasian Code for Reporting of Exploration Results and "qualified person" as this term is defined in Canadian National Instrument 43-101 ("NI 43-101"). Mr von Perger has reviewed this press release and consents to the inclusion in this news release of the information in the form and context in which it appears.
CAUTIONARY NOTE REGARDING FORWARD-LOOKING INFORMATION
This news release contains forward-looking statements and forward-looking information within the meaning of applicable Canadian securities laws, which are based on expectations, estimates and projections as of the date of this news release. This forward -looking information includes, or may be based upon, without limitation, estimates, forecasts and statements as to management's expectations with respect to, among other things, the timing and amount of funding required to execute the Company's exploration, developm ent and business plans, capital and exploration expenditures, the effect on the Company of any changes to existing legislation or policy, government regulation of mining operations, the length of time required to obtain permits, certifications and approvals, the success of exploration, development and mining activities, the geology of the Company's properties, environmental risks, the availability of
labour, the focus of the Company in the future, demand and market outlook for precious metals and the prices thereof, progres s in development of mineral properties, the Company's ability to raise funding privately or on a public market in the future, the Company's future growth, results of operations, performance, and business prospects and opportunities. Wherever possible, words such as "anticipate", "believe", "expect", "intend", "may" and similar expressions have been used to identify such forward-looking information. Forward-looking information is based on the opinions and estimates of management at the date the information is given, and on information available to management at such time. Forward-looking information involves significant risks, uncertainties, assumptions and other factors that could cause actual results, performance or achievements to differ materially from the results discusse d or implied in the forward-looking information. These factors, including, but not limited to, fluctuations in currency markets, fluctuations in commodity prices, the ability of the Company to access sufficient capital on favourable terms or at all, changes in national and local government legislation, taxation, controls, regulations, political or economic developments in Canada, Australia or other countries in which the Company does business or may carry on business in the future, operational or technical difficulties in connection w ith exploration or development activities, employee relations, the speculative nature of mineral exploration and development, obtaining necessary licenses and permits, diminishing quantities and grades of mineral reserves, contests over title to properties, esp ecially title to undeveloped properties, the inherent risks involved in the exploration and development of mineral properties, the uncertai nties involved in interpreting drill results and other geological data, environmental hazards, industrial accidents, unusual or unexpected formations, pressures, cave-ins and flooding, limitations of insurance coverage and the possibility of project cost overruns or unanticipated costs and expenses, and should be considered carefully. Many of these uncertainties and contingencies c an affect the Company's actual results and could cause actual results to differ materially from those expressed or implied in any forward -looking statements made by, or on behalf of, the Company. Prospective investors should not place undue reliance on any forward-looking information. Although the forward-looking information contained in this news release is based upon what management believes, or believed at the time, to be reasonable assumptions, the Company cannot assure prospective purchasers that actual results will be consistent with such forward-looking information, as there may be other factors that cause results not to be as anticipated, estimated or intended, and neither the Company nor any other person assumes responsibility for the accuracy and c ompleteness of any such forward-looking information. The Company does not undertake, and assumes no obligation, to update or revise any such forward -
looking statements or forward-looking information contained herein to reflect new events or circumstances, except as may be required
by law.
No stock exchange, regulation services provider, securities commission or other regulatory authority has approved or disapproved the information contained in this news release.
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Appendix 1 - JORC 2012 Table 1
Section 1 Sampling Techniques and Data
(Criteria in this section applies to all succeeding sections)
Criteria
|
JORC Code explanation
|
Commentary
|
Sampling techniques
|
Nature and quality of sampling (eg cut channels, random chips, or specific specialised industry standard measurement tools appropriate to the minerals under investigation, such as down hole gamma sondes, or handheld XRF instruments, etc). These examples should not be taken as limiting the broad meaning of sampling.
Include reference to measures taken to ensure sample representivity and the appropriate calibration of any measurement tools or systems used.
Aspects of the determination of mineralisation that are Material to the Public Report.
|
Samples from the Diamond-core holes are being taken from mostly NQ sized core (with a small proportion of HQ sized core) and sampled on a nominal 1 metre basis taking into account smaller sample intervals up to geological contacts. The core is cut in half along the core orientation line (where available) and in massive sulphide zones one portion is quartered for assaying, half core is preserved for metallurgical testing and the remaining quarter is
retained as reference material in the core trays. In non massive sulphide material half core is sampled.
Samples from the RC holes were generated from a
4.5 inch sized bit and sampled on an initial 4 metre down-hole composite basis, with zones of mineralisation being samples over 1 metre intervals.
The 4 metre composites are taken via a spear
method into the plastic sample bags, while the 1 metre samples are split via a riffle splitter.
These sampling methods are standard industry methods and are believed to provide acceptably representative samples for the type of mineralisation likely to be encountered.
|
Drilling
techniques
|
Drill type (eg core, reverse circulation, open- hole hammer, rotary air blast, auger, Bangka,
sonic, etc) and details.
|
Diamond-core drilling is being undertaken by a
McCulloch DR800 rig or similar with HQ sized core being drilled to approximately between 80-200m before switching to NQ size. Various techniques are employed to ensure the hole is kept within limits of
the planned position. The core is laid out in standard plastic cores trays.
The RC drilling has been undertaken by a Schramm T450WSI rig that is drilling a 4.5 inch hole with face sampling hammer. A booster and auxiliary compressor is used to increase the volume and pressure of air. The 1 metre samples were fed through a cyclone and riffle splitter before passing into green plastic bags which are laid out in rows on the ground.
|
Drill sample
recovery
|
Method of recording and assessing core and chip sample recoveries and results assessed.
|
The core is transported to an enclosed core logging area and recoveries are recorded. Recoveries to date have been better than 95%. The core is
orientated, where possible and marked with 1 metre
downhole intervals for logging and sampling.
The recoveries for the RC drilling are also recorded and have mostly been 100%.
|
Logging
|
Whether core and chip samples have been geologically and geotechnically logged to a
level of detail to support appropriate Mineral Resource estimation, mining studies and metallurgical studies.
|
Both Diamond core and RC holes are fully geologically logged by geologists. Geotechnical
logging is also being undertaken on selected sections of the core. Samples for metallurgical testing are being kept in a freezer to reduce oxidation prior to
|
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Criteria
|
JORC Code explanation
|
Commentary
|
being transported to the metallurgical laboratory.
|
Sub-sampling
techniques and sample preparation
|
For all sample types, the nature, quality and appropriateness of the sample preparation technique.
|
All core samples are crushed then pulverised in a ring pulveriser (LM5) to a nominal 90% passing 75 micron. An approximately 250g pulp sub-sample is taken from the large sample and residual material
stored.
A quartz flush (approximately 0.5 kilogram of white, medium-grained sand) is put through the LM5 pulveriser prior to each new batch of samples. A number of quartz flushes are also put through the pulveriser after each massive sulphide sample to ensure the bowl is clean prior to the next sample being processed. A selection of this pulverised quartz flush material is then analysed and reported by the lab to gauge the potential level of contamination that may be carried through from one sample to the next.
The RC samples are pulverised directly in the LM5 ring pulveriser with the same quartz flush procedure as above.
|
Quality of assay
data and laboratory tests
|
The nature, quality and appropriateness of the assaying and laboratory procedures used and whether the technique is considered partial or total.
Nature of quality control procedures adopted (eg standards, blanks, duplicates, external laboratory checks) and whether acceptable
levels of accuracy (ie lack of bias) and precision have been established.
|
Sample preparation and assaying is being conducted through ALS Laboratories, Orange, NSW with certain final analysis of pulps being undertaken at the ALS Laboratory in Brisbane QLD.
Gold is determined by 30g fire assay fusion with ICP- AES analysis to 1ppb LLD.
Other elements by mixed acid digestion followed by
ICP-AES analysis.
Laboratory quality control standards (blanks, standards and duplicates) are inserted at a rate of 5 per 35 samples for ICP work.
|
Verification of
sampling and assaying
|
The verification of significant intersections by either independent or alternative company
personnel.
Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols.
Discuss any adjustment to assay data.
|
An internal review of results was undertaken by company personnel. No independent verification was
undertaken at this stage.
All field and laboratory data has been entered into an industry standard database using a contract
database administrator (DBA) in the Company's
Perth office. Validation of both the field and
laboratory data is undertaken prior to final acceptance and reporting of the data.
Quality control samples from both the Company and the Laboratory are assessed by the DBA and reported to the Company geologists for verification. All assay data must pass this data verification and quality control process before being reported.
|
Location of data
points
|
Accuracy and quality of surveys used to locate drill holes (collar and down-hole surveys),
trenches, mine workings and other locations
used in Mineral Resource estimation.
|
The drill collars were initially located with a combination of handheld GPS and licenced surveyor
using a DGPS system, with accuracy of about 1m.
The final drill collars are "picked up" by a licenced
surveyor.
While drilling is being undertaken, downhole surveys are conducted using an Eastman, Pathfinder survey tool that records the magnetic azimuth and dip of the hole. These recordings are taken approximately
|
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Criteria
|
JORC Code explanation
|
Commentary
|
every 30 metres downhole. Where possible holes are also being surveyed with gyroscopic methods, with some 80 percent of holes drilled in the current program also surveyed by this method after drilling has been completed.
A north seeking gyroscopic tool has been used to provide collar azimuth data for about half the Diamond holes drilled to date.
|
Data spacing
and distribution
|
Data spacing for reporting of Exploration
Results.
Whether the data spacing and distribution is sufficient to establish the degree of geological and grade continuity appropriate for the
Mineral Resource and Ore Reserve estimation procedure(s) and classifications applied.
Whether sample compositing has been applied.
|
The Diamond drilling is mostly following-up in various directions from previous intercepts with a nominal
intercept spacing of no less than 30m. This drill hole spacing will be sufficient to provide certain Mineral Resource estimates in the future.
|
Orientation of
data in relation to geological structure
|
Whether the orientation of sampling achieves unbiased sampling of possible structures and
the extent to which this is known, considering the deposit type.
|
The drilling orientation is designed to intersect the mineralised lenses at a close to perpendicular angle.
The mineralised lenses are dipping at approximately
50-70 degrees to the west and the drilling is approximately at 60 degrees to the east. This will vary from hole to hole.
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Sample security
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The measures taken to ensure sample security.
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Samples are being secured in green plastic bags and are being transported to the ALS laboratory in Orange, NSW via a courier service or with Company personnel.
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Audits or reviews
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The results of any audits or reviews of sampling techniques and data.
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A review and assessment of the laboratory procedures was under taken by company personnel
resulting in some changes to their sample pulverising
procedure.
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Section 2 Reporting of Exploration Results
(Criteria listed in the preceding section also apply to this section.)
Criteria
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JORC Code explanation
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Commentary
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Mineral
tenement and land tenure status
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Type, reference name/number, location and ownership including agreements or material
issues with third parties such as joint ventures, partnerships, overriding royalties, native title interests, historical sites,
wilderness or national park and environmental settings.
The security of the tenure held at the time of reporting along with any known impediments
to obtaining a licence to operate in the area.
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The Woodlawn project is located 250km south-west of Sydney in the state of New South Wales. The
area is near the top of the Great Australian Dividing range and has an elevation around 800m above sea- level. The mineral and mining rights to the project
are owned 100% by the Company through the granted, special mining lease 20 (SML20). The lease
completed its second 21 year term on the 16
November 2014 and the Company is in the final stages of documentation with the DRE for an extension of this term for a further 15 years. The Company is not aware of any reason why SML20 will not be renewed.
The project area is on private land owned by Veolia who operate a waste disposal facility that utilises the historical open-pit void. An agreement is in place
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Criteria
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JORC Code explanation
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Commentary
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with Veolia for the Company to purchase certain
sections of this private land to facilitate future mining and processing activities. A cooperation agreement is also in place between Veolia and the Company that covers drilling and other exploration activities in the area.
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Exploration done
by other parties
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Acknowledgment and appraisal of exploration by other parties.
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The Woodlawn deposit was discovered by the
Jododex JV in 1970 and open-pit mining began in
1978 and continued through to 1987. The project was bought outright by Rio Tinto (CRA) in 1984 who completed the open-pit mining. Underground operations commenced in 1986 and the project was sold to Denehurst Ltd in 1987 who continued underground mining up until 1998. The mineral rights to the project were then acquired by TriAusMin Ltd in
1999 who conducted further studies on a tailings re-
treatment and revived underground operation. Heron took 100% ownership of the project in August 2014 following the merger of the two companies. Some
980 surface and underground drill holes have been completed on the project to date and several studies undertaken.
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Geology
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Deposit type, geological setting and style of mineralization.
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The Woodlawn deposit comprises volcanogenic massive sulphide mineralisation consisting of stratabound lenses of pyrite, sphalerite, galena and chalcopyrite. The mineralisation is hosted in the
Silurian aged Woodlawn Felsic Volcanic package of
the Goulburn sub-basin on the eastern side of the
Lachlan Fold Belt.
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Drill hole
Information
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A summary of all information material to the understanding of the exploration results
including a tabulation of the following
information for all Material drill holes:
o easting and northing of the drill hole collar
o elevation or RL (Reduced Level -
elevation above sea level in metres) of the
drill hole collar
o dip and azimuth of the hole
o down hole length and interception depth
o hole length.
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A table detailing the drill hole information is given in the body of the report.
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Data
aggregation methods
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In reporting Exploration Results, weighting averaging techniques, maximum and/or
minimum grade truncations (eg cutting of high
grades) and cut-off grades are usually
Material and should be stated.
Where aggregate intercepts incorporate short lengths of high grade results and longer lengths of low grade results, the procedure used for such aggregation should be stated and some typical examples of such aggregations should be shown in detail.
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The reported assays are weighted for their assay interval width. The majority of the assay interval
widths are 1 metre, but this weighting does take into
account the non 1 metre intervals and weights the average assay results accordingly.
For the results reported here no weighting was included for specific gravity (SG) measurements that have been taken for all sample intervals as the samples within the intervals are of a similar SG.
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Relationship between
mineralization
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These relationships are particularly important in the reporting of Exploration Results.
If the geometry of the mineralisation with
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The massive sulphide zone intercepted in the drilling to date is at an angle to the drill axis and therefore
the true width is estimated to be some 0.8 of down-
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Criteria
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JORC Code explanation
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Commentary
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widths and intercept lengths
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respect to the drill hole angle is known, its nature should be reported.
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hole width. That is, a down-hole intercept of 16m equates to a true width of 12m. This is only an approximation at this stage and will be better estimated as the orientation of the lenses is better defined.
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Diagrams
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Appropriate maps and sections (with scales) and tabulations of intercepts should be included for any significant discovery being
reported These should include, but not be limited to a plan view of drill hole collar
locations and appropriate sectional views.
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A long-section showing the hole positions relevant for current phase of exploration is included in the
release. Other maps and diagrams showing the location of the Woodlawn Project are included in other recent Company releases.
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Balanced
reporting
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Where comprehensive reporting of all
Exploration Results is not practicable, representative reporting of both low and high grades and/or widths should be practiced to
avoid misleading reporting of Exploration
Results.
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The reporting is considered to be balanced and all relevant results have been disclosed for this current
phase of exploration.
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Other
substantive exploration data
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Other exploration data, if meaningful and material, should be reported including (but not limited to): geological observations;
geophysical survey results; geochemical
survey results; bulk samples - size and method of treatment; metallurgical test results; bulk density, groundwater, geotechnical and rock characteristics; potential deleterious or contaminating substances.
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There is no other substantive exploration data that has been generated for inclusion in this report.
The drill holes are being cased with either 40 or 50 millimetre PVC tubing for down-hole EM surveying.
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Further work
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The nature and scale of planned further work (eg tests for lateral extensions or depth extensions or large-scale step-out drilling).
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The drilling program at Woodlawn is designed to provide input into a revised Mineral Resource estimate for the project. The First Phase of the program is coming to a conclusion. Pending the
results of the Preliminary Economic Assessment, a
further program of in-fill drilling may be undertaken to provide inputs into future feasibility studies.
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