Heron Resources (HER-T) Confirms B Lens & Shallow Extensions to G Lens at Woodlawn
Sept 6, '16 - NR
Heron Resources is pleased to provide initial results from the drilling program completed at its wholly-owned Woodlawn Project, located 250km south-west of Sydney, New South Wales, Australia. A total of eight diamond core holes were completed for 2,527m.
This drilling program comprised:
1) Step out testing of the B Lens to the north where previous drilling on this high priority target had been hampered by drill pad access, due to an evaporation dam.
2) Shallow holes in the G Lens system to probe for extensions to lenses, that may add resources which would further support the early stages of the underground mine schedule.
Commenting on these latest results, Heron Managing Director and CEO, Mr Wayne Taylor, said:
“The completion of the Woodlawn Feasibility Study has provided Heron with the opportunity to pursue a number of prospective targets in and around Woodlawn that could extend the resource and optimise the mine schedule. The initial results have been extremely encouraging and support our view that this mineralised system has much more to deliver. The G2 Lens and a possible new lens in the hanging wall of G2 are very close to surface, providing an excellent opportunity to add to the early production from the underground while the B Lens north and adjacent Cowley Hills prospect both represent significant potential additions to the medium term schedule.”
Eight diamond holes totalling 2,527m
Assays received to-date are only for two holes in this program and recorded a very significant intercept in the shallow G2 Lens position (potential additions to the Mineral Resource statement):
11m @ 11% ZnEq[1] from 133m (6.3% Zn, 0.5% Cu, 3.3% Pb, 0.1g/t Au, 10g/t Ag) - WNDD0106
Other significant base metal sulphide intersections logged geologically, assays pending, include:
4m of polymetallic sulphides from 552m (B Lens extension) - WNDD0108
7m of polymetallic and Cu stringer sulphides from 570m (B Lens extension) - WNDD0108
0m of Zn stringer and polymetallic sulphides from 109m (G2 hanging wall) - WNDD0110
1m of Zn stringer sulphides from 140m (G2 Lens extension) - WNDD0110
75m of massive Cu-rich sulphides from 178m (G2 Lens extension) - WNDD0111
From Cowley Hills, positioned 2 km to the north of Woodlawn in the same prolific host rocks:
6m of Cu and Zn stringer and semi-massive sulphides from 205m (Cowley Hills) - CHDD0001
Significant DHEM conductors from drill hole WNDD0105 indicating potential for B Lens continuity to the north
Significant DHEM conductor from the down-hole survey in the Cowley Hills prospect showing potential for continuity of mineralisation to 170m vertical depth below old workings
[1] ZnEq% used in this release refers to the calculated Zn equivalent grade based on the Zn, Cu, Pb, Au and Ag grades, the formula for which is provide in Appendix 2 at the end of this report.
B Lens North Drilling
As reported in Heron’s June quarterly report, the first hole (WNDD0105) of the current program intersected a zone of polymetallic sulphides over 1.2m in width within a broader 4.5m of stringer sulphides from 538m depth. This intercept confirms the extension of the B Lens horizon in this northerly direction and represents a step-out of over 100m from existing drilled mineralisation. Three thinner (10-30cm) zones of polymetallic massive sulphides were intersected at 516m, 526m and 547m depth often with faulted contacts indicating the possible presence of relatively broad zones of sulphide mineralisation with the volcanic package. Assay results were as follows (details are provided in Appendix 1):
5m @ 5.8% ZnEq from 538m (2.3% Zn, 0.8% Cu, 0.5% Pb, 0.2g/t Au, 13.1g/t Ag) - WNDD0105
A down hole electromagnetic (DHEM) survey on WNDD0105 resulted in three plates being modelled (Figure 1):
Plate 1 is related to the in-hole mineralisation and measures approximately 70m x 70m with a conductance of 25S.
Plates 2 and 3 relate to a broad off-hole response and measure approximately 250m x 150m with a conductance of 50S.
The modelling indicates that the bulk of the conductivity is south of the hole, towards the mined B Lens position and with Plate 2 being in part related to the known mineralisation of B Lens.
As shown in Figure 1, there is potential for a substantial volume of mineralisation in the zone defined by the DHEM plates to the north of B Lens with historic hole, W151, and current hole, WNDD0105, interpreted to be close to the current outer limits.
WNDD0108 was drilled to intersect towards the northern edge of the modelled EM plates (Figure 1) and returned two significant intercepts:
4m of massive polymetallic sulphides from 552m - WNDD0108
7m of massive polymetallic and Cu stringer sulphides from 570m (incl. 3m internal waste) - WNDD0108
The upper mineralisation is expected to grade well and may represent the edge of a previously unrecognised lens in the hanging wall to B Lens. The 10.7m lower intercept is the main B Lens and demonstrates the potential for a substantial tonnage in this zone and confirms the extension of B Lens to the north.
Figure 1: Oblique long-section (looking approximately east) for the northern end of the B Lens position, showing location of WNDD0105, DHEM plates and earlier drilling. http://www.globenewswire.com/NewsRoom/AttachmentNg/3c451ca3-0128-4dbb-bba4-3f9544755d49
G2 Lens Drilling
Five holes (Figure 2) have been completed on the G2 Lens position targeting shallow extensions to known mineralisation. A very significant intercept was returned in WNDD0106 located 50m down dip from the Mineral Reserve:
11m @ 11% ZnEq from 133m (6.3% Zn, 0.5% Cu, 3.3%Pb, 0.1g/t Au, 10g/t Ag) - WNDD0106
Other sulphide intersections where assays are pending include:
6m of pyritic sulphides with minor Zn/Cu from 148m - WNDD0107
0m of weak Zn stringer sulphides from 130m - WNDD0109
0m of Zn stringer and massive polymetallic sulphides from 109m (potential new lens) - WNDD0109
1m of Zn stringer sulphides from 140m - WNDD0110
75m of massive Cu-rich sulphides from 178m - WNDD0111
The massive sulphides intersected at 109m in WNDD0110 are very significant, visually appear to be very high grade, and may be related to a new lens position in the hanging wall to the G2 Lens.
The lower intercept at 140m in WNDD0110 is a more typical G2 Lens intercept consisting of 1-10cm wide zinc sulphide stringers (sphalerite) with pyrite and lesser Pb and Cu sulphides above a chloritically altered footwall with finer sulphide stringers. A weaker zone of Cu and Zn sulphide stringers also exists at 200m in this hole.
The G2 Lens (Figures 2 and 3) is open down-dip, with very little drilling having been undertaken on the zone previously. Given the shallow position of the lens, it is potentially an important contributor in the early years of the operation. Metallurgical test work is currently being performed on the sphalerite stringer material and recoveries are expected to be in line with or better than other Woodlawn massive sulphides given the generally coarser grained nature of this style of mineralisation.
Drill core photos of the WNDD0106 mineralisation are provided in Appendix 2.
Figure 2: G2 Lens long-section showing existing lens shape and recent drilling. http://www.globenewswire.com/NewsRoom/AttachmentNg/ec2b57cf-b9ae-455a-ab2b-ec4b19f6a65b
Figure 3: G2 Lens Cross Section, showing result in WNDD0106 and surrounding holes. http://www.globenewswire.com/NewsRoom/AttachmentNg/82295e75-5bfa-4f49-b86d-3d7c307dde30
Cowley Hills DHEM Target
The Cowley Hills prospect is located 2km north of Woodlawn and consists of a Woodlawn-style VMS deposit that was partially mined from underground in 1990 (35,000t extracted). A single historical hole drilled in 1985, W158, was surveyed with high powered DHEM as part of the current program and resulted in the modelling of a 60m x 80m sized plate located in the down-dip position of the known mineralisation (Figure 4).
Combining the DHEM, historical drilling and known limits of mined stopes there is potential at Cowley Hills for a zone of mineralisation measuring 80m along strike and 170m down dip. Given the similarities with the Woodlawn mineralisation there is potential to extend this further; however, the controls on the lens have not been well established.
A single hole was drilled to test this lower zone of mineralisation and provide a sample for metallurgical test work. A significant sulphide intersection was returned:
6m of Cu and Zn stringer and semi-massive sulphides from 205m - CHDD0001
The intercept consisted of fine-grained pyrite and base-metal sulphides hosted in a strongly chlorite altered basalt unit with a sharp footwall contact marked by an intrusive dolerite unit.
The potential for a Mineral Resource at Cowley Hills is being assessed including the possibility of accessing the ore from an open-pit position which would have the potential to supply production feed during the early years of the Woodlawn operation.
Figure 4: Cowley Hills Prospect, long-section looking east showing existing mine workings, drilling and location of the DHEM plate. http://www.globenewswire.com/NewsRoom/AttachmentNg/31c8483e-e72a-49f2-b608-724fa156bbc1
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. In addition, the Company holds a significant high quality, gold and base metal tenement holding in New South Wales and Western 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 Limited 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 reviewed this press release and consents to the inclusion in this report of the information in the form and context in which it appears.
Appendix 1 http://www.globenewswire.com/NewsRoom/AttachmentNg/c8b44a34-7f7e-42a5-b352-259f7912bbe6
Drill core photos from WNDD0106: Zn%, Cu%, Pb% grades are shown and have been derived from a hand-held XRF Niton device that provides approximate metal grades for a particular point of the core. The grades shown are indicative only and are not in any way meant to provide average grades for specific intervals. The actual grade for the broader interval (as reported above) was 11m @ 6.3% Zn, 0.5% Cu, 3.3%Pb, 0.1g/t Au, 10g/t Ag (11% ZnEq) from 133m. The rocks consist of strongly altered, moderately foliated dacitic volcanic derived mudstones (light colours) and chloritic schist (dark green/black) with stringers of semi-massive sphalerite (reddish) and pyritic (golden) sulphides.
Appendix 2
Drill hole details for diamond drill holes completed as part of the Phase III drill campaign.
| Hole No. | WMG
East (m) | WMG
North (m) | WMG
RL (m) | Surface
Dip | WMG Surface
Azimuth | EOH
Depth (m) | Target | | WNDD0105 | 8973 | 19718 | 2786 | -70 | 076 | 633.7 | Northern B Lens horizon | | WNDD0106 | 9187 | 19202 | 2795 | -60 | 115 | 167.0 | G2 Lens down plunge | | WNDD0107 | 9187 | 19202 | 2795 | -67 | 088 | 170.0 | G2 Lens down plunge | | WNDD0108 | 8974 | 19720 | 2786 | -75 | 090 | 633.8 | B Lens south WNDD0105 | | WNDD0109 | 9153 | 19217 | 2791 | -68 | 132 | 255.7 | G2 Lens down-dip WwwwWWWNDD0106 | | WNDD0110 | 9175 | 19206 | 2795 | -72 | 105 | 222.7 | G2 Lens down-dip | | WNDD0111 | 9170 | 19211 | 2795 | -72 | 83 | 205.1 | G2 Lens down-dip WNDD0110 | | CHDD0001 | 10541 | 21967 | 2825 | -60 | 80 | 238.8 | Targeting EM plate |
Notes: WMG = Woodlawn Mine Grid
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.
| Hole No | From (m) | To (m) | Downhole Width (m) | Estimated True Width (m) | ZnEq% | Zn (%) | Cu (%) | Pb (% | Au (g/t) | Ag (g/t) | | | | | WNDD0105 | 526.0 | 527.5 | 1.5 | 1.2 | 5.2 | 3 | 0.2 | 1.1 | 0.1 | 18.2 | | | WNDD0105 | 537.7 | 542.2 | 4.5 | 3.6 | 5.8 | 2.3 | 0.8 | 0.5 | 0.2 | 13.1 | | | WNDD0106 | 132.7 | 143.6 | 10.9 | 8.7 | 11 | 6.3 | 3.3 | 0.5 | 0.1 | 10.4 | |
Notes: True width is an estimate of the actual thickness of the intercept based on interpreted lens orientation (approximately 80% to 90% of downhole width, with 80% used in this table as a general guide); 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.
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
Tel: +61 2 8298 6100
jon.snowball@fticonsulting.com
Canada:
Tel: +1 647-862-1157 (Toronto) |
