Heron’s Drilling Delivers Massive Sulphide Intercepts at G2 and Lisa Lenses
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Sydney, New South Wales, April 19, 2018 (GLOBE NEWSWIRE) -- Heron Resources Ltd. (ASX:HRR “Heron” or the “Company”) is pleased to advise that it has intersected significant base-metal sulphide mineralisation at its wholly-owned Woodlawn Zinc-Copper Project, located 250km south-west of Sydney, New South Wales, Australia. The intercepts at both the G2 and Lisa Lens positions extend the limits of the mineralisation in these areas and will provide additional early stage production for the operation.
Diamond drilling program recently commenced targeting the G2 and Lisa Lens positions, 5 holes for 1,125m completed to date
G2 Lens (awaiting assays)
6.0m from 120.4m of high-grade (up to 30% Zn from handheld XRF1 readings) massive and stringer sphalerite+galena (high-grade G2 hanging wall zone) WNDD0138
5.0m from 138.3m of Zn stringer mineralisation (typical G2 main zone) WNDD0138
7.4m from 129.0m of Zn stringer mineralisation (typical G2 main zone) WNDD0139
Lisa Lens (awaiting assays)
11.0m of Cu-rich massive sulphide from 202.0m in upper centre of lens (approx. 4 to 5% Cu from averaged handheld XRF readings) providing further scope to extend Lisa up-dip WNDD0135
The drilling extends both the G2 and Lisa lenses. In particular, the intercepts at G2 extend the mineralised zone closer towards the mine portal providing potentially an additional shallow production source for the early stages of the mine. Further drilling will be undertaken over the next few weeks in this area to better define mineralisation limits
Commenting on the intercepts, Heron Resources Managing Director and CEO, Mr Wayne Taylor, said: “the results of the drilling program to date continue to build off the 2017 drilling and are very encouraging, providing extensions to both these lenses. The high grade G2 hanging-wall (G2HW) intercept in WNDD0138 appears to be one of the better intercepts into G2 hanging-wall position we have seen and has the potential to boost the early mine cash flow. The southern end of G2 Lens remains open and further drilling is being planned to better delineate this position. In addition, encouraging metallurgical test results have now been received for the G2 and G2HW Lenses. The program represents an important component of the early stages of the Woodlawn mine development schedule”
G2 Lens Drilling
The G2 Lens is located adjacent to the planned route of the decline at 120m to 150m below the surface and represents the first underground ore that would be processed through the plant. Initial metallurgical test work results on 3 composite samples (G2 Main, G2 Hanging Wall and G2 Copper) have been received and show encouraging recoveries and concentrate grades and will be the subject of a later market release following the receipt of the full test work program results.
Two diamond holes for 341m have been completed recently on the southern extent of the G2 Lens to better delineate this position which is open to the south of WNDD0133 (see Figures 1-3). Both holes intersected significant sulphide mineralisation:
6.0m from 120.4m of high-grade (up to 30% Zn from hand-held XRF readings) massive and stringer sphalerite/galena (high-grade G2HW), WNDD0138
5.0m from 138.3m of Zn stringer mineralisation (typical G2 main zone), WNDD0138
7.4m from 129.0m of Zn stringer mineralisation (typical G2 main zone), WNDD0139
These results are highly encouraging and extend the G2 Lens some 20m to the south and down-dip in this area. Importantly, the very high-grade G2 Hanging Wall (G2HW) position has been extending to the south beyond WNDD0116, although its continuity is expected to be variable. Assays are currently pending, and follow-up drilling is planned. With the expanding footprint, it is clear that G2 Lens is proving-up to be an important addition to the early mine inventory. The drill rig is currently drilling a geotechnical hole before recommencing at the G2 Lens.
Lisa Lens Drilling
The Lisa Lens is located adjacent to the I Lens in the upper-most horizon within the Woodlawn mineral system (Figure 4) approximately 80 meters from the planned decline route at 200-250m below the surface. The current program is designed to better delineate the lens position with a significant Cu-dominated intercept being received to date, located approximately 40m up dip from previous drilling:
11.0m of Cu rich massive sulphide from 202.0m in upper centre of lens (approx. 4 to 5% Cu from averaged hand-held XRF readings), WNDD0135
This intercept combined with results of an electromagnetic survey suggests the lens has a strike length of about 35-40m and extends down dip approximately 120m. The copper-rich intercept aligns with the Cu-dominated intercept in historic hole W145 (8.0m @ 1.9% Cu). Such copper zones typically occur on the southern edge of the Woodlawn lenses and it is likely polymetallic mineralisation occurs along strike to the north as noted in WNDD0104 (12.4m @ 20% ZnEq)2 and WNDD0015 (4.2m @ 28.5% ZnEq)2.
Figure 1: Long section of the G2 Main Lens showing interpreted lens shape, previous drilling and the two recent drill intercepts. View to northeast.
http://www.heronresources.com/tsximages/20180419/190418_fig1.jpg
Figure 2: Long section of the G2 Hanging Wall Lens showing interpreted lens shape, previous drilling and the recent drill intercept in WNDD0138. View to northeast.
http://www.heronresources.com/tsximages/20180419/190418_fig2.jpg
Figure 3: Massive sphalerite rich drill core intersection from WNDD0138 in the G2 Hanging Wall position. Handheld Niton XRF analysis of these sphalerite rich massive sulphide zones returned an average of approximately 30% Zn (some 25 readings taken) over the interval 120.4 to 126.4m. The average zinc grade, however, is expected to be slightly lower than this as the handheld XRF reading does not take into account some internal gangue and other dilution. The interval shown here is approximately 80cm long.
http://www.heronresources.com/tsximages/20180419/190418_fig3.jpg
Figure 4: Long section of the Lisa Lens showing interpreted lens shape, the location of previous drill intercepts and this program’s proposed infill holes. View to northeast.
http://www.heronresources.com/tsximages/20180419/190418_fig4.jpg
About Heron Resources Limited:
Heron’s primary focus is the development of its 100% owned, high grade Woodlawn Zinc-Copper Project located 250km southwest of Sydney, New South Wales, Australia.
Compliance Statement (JORC 2012 and NI43-101)
The technical information in this report relating to the exploration results is based on information 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 Ltd. and has sufficient experience, which is 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 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 approved the scientific and technical disclosure in the news release.
Zinc equivalent calculation
The zinc equivalent ZnEq calculation takes into account, mining costs, milling costs, recoveries, payability (including transport and refining charges) and metal prices in generating a Zinc equivalent value for Au, Ag, Cu, Pb and Zn. ZnEq = Zn%+Cu%*3.12+Pb%*0.81+*Au g/t*0.86+Ag g/t*0.03. Metal prices used in the calculation are: Zn US$2,300/t, Pb US$ 2,050/t, Cu US$6,600/t, Au US$1,250/oz and Ag US$18/oz. It is Heron’s view that all the metals within this formula are expected to be recovered and sold. Metallurgical metal recoveries used for the formula are 88% Zn, 70% Pb, 70% Cu, 33% Au and 82% Ag; these are based on historical recoveries at Woodlawn and supported by metallurgical test work undertaken during the 2015-16 feasibility study.
Appendix 1
Drill hole details for diamond drill holes completed as part of the Phase V drill campaign.
Hole No. | WMG East (m) | WMG North (m) | WMG RL (m) | Surface Dip | WMG Surface Azimuth | EOH Depth (m) | Target |
WNDD0134 | 9074.3 | 19544.1 | 2795 | -74 | 65.0 | 239.7 | Lisa Lens |
WNDD0135 | 9074.3 | 19544.1 | 2795 | -73 | 92.0 | 242.3 | Lisa Lens |
WNDD0137W1 | 9074.3 | 19544.1 | 2795 | -70 | 110.0 | 242.8 | Lisa Lens |
WNDD0138 | 9157.8 | 19165.8 | 2794 | -68 | 99.0 | 170.9 | G2HW and G2 Lenses |
WNDD0139 | 9157.8 | 19165.8 | 2794 | -59 | 125.0 | 170.8 | G2HW and G2 Lenses |
Notes: WMG = Woodlawn Mine Grid
1 See Table 1 at the end of this report for details of the hand-held XRF device used
2 WNDD0104: 12.4m @ 20.5 ZnEq (12% Zn, 1.6% Cu, 2.0% Pb, 0.7g/t Au, 23g/t Ag); WNDD0015: 4.2m @ 28.5% ZnEq (17.7% Zn, 1.6% Cu, 5.0% Pb, 28g/t Ag, 1.1g/t Au)
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 |
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Drilling techniques |
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Drill sample recovery |
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Logging |
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Sub-sampling techniques and sample preparation |
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Quality of assay data and laboratory tests |
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Verification of sampling and assaying |
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Location of data points |
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Data spacing and distribution |
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Orientation of data in relation to geological structure |
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Sample security |
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Audits or reviews |
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Section 2 Reporting of Exploration Results
(Criteria listed in the preceding section also apply to this section.)
Criteria | JORC Code explanation | Commentary |
Mineral tenement and land tenure status |
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Exploration done by other parties |
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Geology |
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Drill hole Information |
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Data aggregation methods |
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Relationship between mineralization widths and intercept lengths |
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Diagrams |
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Balanced reporting |
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Other substantive exploration data |
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Further work |
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For further information, please visit www.heronresources.com.au or contact:
Australia:
Mr Wayne Taylor
Managing Director and Chief Executive Officer
Tel: +61 2 9119 8111 or +61 8 6500 9200
Email: heron@heronresources.com.au
Jon Snowball
FTI Consulting
+61 2 8298 6100
jon.snowball@fticonsulting.com