Hemi confirms potential for major discovery
(firmenpresse) - 6 February 2020
- Substantial thick and high-grade gold mineralisation intersected on two sections 640m apart. Mineralisation open in all directions and at depth.
- Section A - 30m width (at) 3.7g/t - 7.5g/t defined to 100m depth.
- Section B - +60m width, all holes ended in mineralisation.
- 50 holes from current program awaiting assay results.
- Step out aircore drilling continues. RC and DD rigs being mobilised.
Section A - 30m wide to 100m depth (oxide and fresh). Open in all directions
24m (at) 7.5g/t Au from 126m in BWAC315, including 18m (at) 8.6g/t (EOH)
49m (at) 3.7g/t Au from 65m in BWAC309, including 18m (at) 6.6g/t
36m (at) 4.0g/t from 39m in BWAC245, including 11m (at) 8.9g/t
(BWAC245 is an updated intercept based on resampling on a 1m basis)
*Assays pending for 2 further holes on this immediate portion of Section A
Figure 1-Hemi Prospect - Section A
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Section B - +60m wide gold zone to 20m depth (oxide). Open in all directions.
24m (at) 4.2g/t Au from 36m in BWAC312, including 10m (at) 7.4g/t (EOH)
15m (at) 2.5g/t Au from 33m in BWAC313 (EOH)
21m (at) 2.5g/t from 36m in BWAC258 (EOH)
(BWAC258 is an updated intercept based on resampling on a 1m basis)
*All three holes finish in mineralisation
Figure 2-Hemi Prospect - Section B
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Andy Beckwith, Technical Director commented.
For an exploration geologist, these results are both satisfying and exciting. Hemis shallow high grade gold zones provide an excellent opportunity to increase resources and further derisk our path to production.
The individual assays down hole are very robust creating solid high grade gold zones over considerable thicknesses which we expect to continue at greater depth. On Section A, drilling has defined a subvertical to south dipping 30m wide gold zone hosted in sediments. Section B shows a potential +60m wide gold zone in an intrusive with drilling yet to be completed below the oxide zone.
We currently interpret the two 640m sections are structurally related, suggesting we could be drilling a major new gold discovery. Aircore drilling will continue to define the lateral extent, orientation and potential scale of the mineralised system. Follow-up RC and diamond drilling will commence shortly with a view to establishing an initial inferred resource.
De Grey Mining Limited (ASX: DEG, De Grey, Company) is pleased to advise outstanding initial results from follow up aircore drilling at the newly discovered Hemi Prospect (Figure 3). The aircore drilling program is aimed at better defining the recent high grade gold mineralisation (43m (at) 3.7g/t Au and 25m (at) 2.7g/t Au*), on the 640m spaced sections as well as infilling lines to establish 320m x 80m spaced drilling.
This report covers initial results from the first 7 holes completed on the two initial discovery Sections A and B. The aircore program remains ongoing with a total of 57 new holes (BWAC309 to BWAC365) completed for a total of 4709m to date. Further results remain pending for 50 holes including on the original Section A and step out lines along strike.
* ASX release New Gold Discoveries at Hemi and Antwerp, dated 17 December 2019
Figure 3-Mallina Gold Project showing main gold deposits and areas of discussion.
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Aircore Results
The 2020 aircore drilling program commenced in mid-January with initial drilling focused on deeper holes to refusal to determine the dip of the high grade gold mineralisation. Following this, additional infill and step out lines spaced at 320m x 80m commenced, including infilling the two existing lines to 80m spaced collars. Ongoing drilling continues, targeting 320m x 80m spaced holes along 2.5km of the prospective corridor at Hemi. Significant results (>2gm*m) are provided in Table 1.
Section A
On Section A (Figures 1, 4 and 5), infill aircore drilling has been completed with initial results received for priority holes BWAC309, 310 and 315. Additional 1m resampling has been completed on the original discovery hole BWAC245. Results for holes BWAC319-323 on this section are yet to be received.
The results to date define a substantial steeply south dipping zone of high grade gold mineralisation. All intercepts grade >3.7g/t over substantial intervals and define an apparent sectional width of approximately 30m. The true width definition requires further drilling to determine strike orientation. Importantly, the deepest hole BWAC315 has intersected the highest grade to date of +24m (at) 7.5g/t finishing within the gold zone. Significant results to date include:
24m (at) 7.5g/t Au from 126m in BWAC315, including 18m (at) 8.6g/t (EOH)
49m (at) 3.7g/t Au from 65m in BWAC309, including 18m (at) 6.6g/t
36m (at) 4.0g/t from 39m in BWAC245, including 11m (at) 8.9g/t
(BWAC245 is an updated intercept based on resampling on a 1m basis)
Geological logging indicates the gold mineralisation is hosted in a sequence of highly leached fine grained sediments with abundant disseminated sulphides and only minor quartz veining. The mineralisation occurs immediately beneath 30m of transported material. Weathering of the bedrock has produced an oxide horizon approximately 20m thick transitioning into fresh sulphides below. Drilling has defined the gold zone to approximately 130m below surface providing over 100m of vertical extent in bedrock. Mineralisation remains open along strike and is expected to continue at depth.
Drill hole BWAC315 is the deepest hole drilled at Hemi to date and show strong mineralisation evident at 130m below surface. This depth is at the limit of penetration for the aircore rig, hence the hole finished within the gold zone. A handful of samples in the mineralised zone at the bottom of this hole are of lower volume due to water influx. Larger capacity RC drilling is now required to test deeper.
Figure 4 is a zoomed in portion of the drilling on Section A. This clearly shows the robust and consistent nature of the individual 1m gold assays throughout the zone. Encouragingly, there is an apparent higher grade margin (>5g/t) along the southern margin which provides added scope that typical underground mining methods maybe applicable at depth beyond an initial open pit.
Assay results for BWAC320 and 321 remain pending. Geological logging indicates similar style and intensity of alteration in both holes within the interpreted gold zone. Further encouragement is seen elsewhere with additional alteration zones logged in the wider spaced aircore drilling, with assay results pending.
Figure 4-Hemi Prospect - Section A (zoomed) showing individual gold assays and robust gold mineralization
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Figure 5-Hemi Prospect drilling plan showing new aircore holes and planned holes
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Section B
On Section B (Figures 2, 5 and 6), infill aircore drilling has been completed with initial results received for priority holes BWAC311 -314. Additional 1m resampling has been completed on the original discovery hole BWAC258. Significant results include:
24m (at) 4.2g/t Au from 36m in BWAC312, including 10m (at) 7.4g/t (EOH)
15m (at) 2.5g/t Au from 33m in BWAC313 (EOH)
21m (at) 2.5g/t from 36m in BWAC258 (EOH)
(BWAC258 is an updated intercept based on resampling on a 1m basis)
The results to date define a broad zone of gold mineralisation over at least 60m in apparent width in holes BWAC258, 312 and 313 with intercept grades ranging from 2.2g/t to 4.3g/t. The drilling defines a zone of oxide mineralisation approximately 20m thick immediately beneath 30m of transported cover. The aircore drilling could not penetrate any deeper as the intrusive is harder in fresh rock. Hence the gold zone remains untested and entirely open at depth and potentially to the SW (hanging wall) of hole BWAC313.
Geological logging indicates the broad zone of gold mineralisation is hosted in an altered intrusion with abundant sulphide development. The high grade, broad and robust nature of the gold mineralisation (Figure 6) provides scope to define a substantial resource with further drilling.
At this stage, the interpretation is that the two zones are structurally related and that Section A and Section B are linked. However several mineralised structures could exist.
Figure 6 is a zoomed in portion of the drilling on Section B. The robust nature and consistent high grades is also evident within the oxide zone.
Figure 6-Hemi Prospect - Section B (zoomed) showing individual gold assays and robust gold mineralisation
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DRILLING PROGRAM
De Greys regional and wide spaced aircore program aims to systematically test the various large prospective corridors throughout the project for new large scale gold deposits. The positive drill results at Hemi now provide a key focus for near term resource definition drilling. Accordingly, an RC and diamond rig are being mobilized to site to commence this deeper and more detailed drilling. This drilling will look to test deeper on the known sections and then step out on parallel sections 80m part.
Aircore drilling will continue to test along the Scooby to Antwerp Structural Trend (SAST) during the March quarter to define additional resource drilling targets. Phase 1 of this drilling is nearing completion and will provide 320m x 80m coverage over a 2.5km strike length at Hemi. The phase 2 aircore drilling program will then aim to extend this drilling a further 1.5km SW towards the Antwerp Prospect where other encouraging shallow gold mineralisation has been previously intersected.
This ASX report is authorised for release by the De Grey Board.
For further information:
Simon Lill (Executive Chairman) or
Andy Beckwith (Technical Director and Operations Manager)
De Grey Mining Ltd
Phone +61 8 6117 9328
admin(at)degreymining.com.au
Competent Person Statements
The information in this report that relates to exploration results is based on, and fairly represents information and supporting documentation prepared by Mr. Philip Tornatora, a Competent Person who is a member of The Australasian Institute of Mining and Metallurgy. Mr. Tornatora is an employee of De Grey Mining Limited. Mr. Tornatora has sufficient experience that is relevant to the style of mineralisation and type of deposit under consideration and 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, Mineral Resource and Ore Reserves. Mr. Tornatora consents to the inclusion in this report of the matters based on his information in the form and context in which it appears.
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