West Dome Underground Project
Greatland Gold plc (AIM: GGP)
E: info@greatlandgold.com
W: https://greatlandgold.com
: twitter.com/greatlandgold
NEWS RELEASE | 20 February 2025
West Dome Underground Project
Maiden underground drilling results below the Telfer West Dome Open Pit
confirm high grade near-mine underground opportunity
THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION AS STIPULATED UNDER THE UK MARKET ABUSE REGULATIONS. ON PUBLICATION OF THIS ANNOUNCEMENT VIA A REGULATORY INFORMATION SERVICE, THIS INFORMATION IS CONSIDERED TO BE IN THE PUBLIC DOMAIN.
Greatland Gold plc (AIM:GGP) (Greatland or the Company) is pleased to provide results from the maiden underground drilling campaign at the West Dome Underground target at Telfer.
Highlights
§ Maiden West Dome Underground diamond drilling program completed in December 2024 quarter with all results now returned and interpreted.
§ 16 of the 19 holes drilled in this program intercepted >50 gram-metres Au (gm), with the average down hole intercept from these 16 holes of 23.2m @ 2.95g/t Au and 1.07% Cu (4.23g/t AuEq1)
§ Exceptional results included:
‒ 14.3m @ 9.06 g/t Au and 8.57% Cu (19.34 g/t AuEq) from 290.4m
‒ 59.0m @ 2.83 g/t Au & 0.71% Cu (3.68 g/t AuEq) from 259.0m
§ Mineralisation identified over 700m of strike and remains open along strike and down dip
§ Drilling confirms high grade mineralisation in the West Dome Underground is associated with the same geological units seen at the active Main Dome Underground, which has produced more than 3.1Moz gold and 210kt copper to date
§ Existing infrastructure supports the economics of a potential West Dome Underground Project and would accelerate its development
§ Second phase drilling program planning underway
Greatland Managing Director, Shaun Day, commented:
"The exceptional drilling results from the maiden underground drilling campaign validate the exciting opportunity we identified at the West Dome Underground during our acquisition due diligence.
"The Main Dome Underground began production in mid 2006 and continues operating today, almost 20 years later, having produced more than 3 million ounces of gold to date. This underground drilling campaign is the first since driving across to gain access beneath the West Dome.
"The West Dome Underground drilling delivered high grades and equally importantly, excellent widths. They confirm that key geological units hosting the Main Dome Underground mineralisation are present in the West Dome Underground. Mineralisation remains open along strike and down dip, and we intend to increase our confidence of the initial body as well as continue to test extensions in our further work.
"A primary focus for us at Telfer is mine life extension, and these results confirm the West Dome Underground Project as a very high priority target for us. We are planning a second phase drilling program, including geotechnical and hydrogeological testing to support planned mine studies. If we continue to have exploration success, the ability to leverage the existing underground infrastructure at Telfer, including the haulage shaft, provides the opportunity to rapidly advance development of the West Dome Underground."
West Dome Underground Project
Overview
The first target tested from underground in the West Dome Underground Project is situated approximately 800m below the current West Dome Open Pit.
Figure 1: West Dome Underground Project location
The Main Dome Underground is situated below the Main Dome Open Pit, and to date has produced more than 75Mt for 3.1Moz gold and 210kt copper. In 2007, construction of an underground crusher and haulage shaft was completed, and has been in continuous use since then. Initially the Main Dome Underground mainly operated as a sub level cave, extracting on average 5Mtpa between 2008 to 2019. In 2018 long hole open stope production commenced, producing over 6.4Mt to date.
The West Dome Underground Project (WDU) emerged from the recognition that key geological structures hosting mineralisation in the Main Dome Open Pit repeat in the West Dome Open Pit, specifically the E Reefs and the Middle Vale Reef (MVR, refer Figure 1). Accordingly, it was proposed that the geological features that are key to mineralisation in the Main Dome Underground (refer Figure 1), may also repeat below the West Dome Open Pit.
This concept was drill tested from surface between 2009 - 2019, with a total of 16 diamond holes drilled along the 3km strike length of the concept target. This drilling confirmed the presence of the key geological features and identified the hinge zone of the Lower Limey Unit (LLU) (Figure 1), which has previously been referred to as the 'West Dome Deeps', as a highly prospective zone.
Following the successful outcome of internal mining studies of the WDU target, in 2019 an exploration drill drive from the Main Dome Underground across to the West Dome Underground was proposed and sporadically progressed (due to very limited budget approved by previous owner Newcrest Mining). Following Newmont Mining's acquisition of Newcrest Mining, budget was approved and completion of the drill drive achieved in late 2024, enabling a maiden underground drilling program comprising 19 holes for 7,473m to be completed in the December 2024 quarter.
Drill Results
Results from the maiden underground drill program have consistently intercepted high gold and copper grades and thicknesses (Figure 3). High grade mineralisation is predominantly hosted within the LLU which has produced more than 1.0Moz Au and 75kt Cu in the Main Dome Underground.
Drilling has now defined a strike of more than 700 metres of high grade LLU mineralisation, with an average down hole intercept of 23.2 meters at 2.95 g/t Au and 1.07% Cu (4.23 g/t AuEq) from the 16 drill holes (of 19) that intercepted >50gm Au.
High grade gold and copper mineralisation has been consistently intercepted within the LLU geological unit on the West Limb of the main anticlinal fold structure (Figure 2), while results returned from the East Limb are encouraging but less consistent.
Significant down hole intercepts within the LLU domain include:
§ WUC4550022 with 14.3m @ 9.06 g/t Au & 8.57% Cu (19.34 g/t AuEq) from 290.4m
§ WUC4550007 with 59.0m @ 2.83 g/t Au & 0.71% Cu (3.68 g/t AuEq) from 259.0m
§ WUC4550016 with 20.9m @ 4.27 g/t Au & 2.77% Cu (7.59 g/t AuEq) from 300.2m
§ WUC4550040 with 31.6m @ 3.09 g/t Au & 0.60% Cu (3.81 g/t AuEq) from 284.7m
§ WUC4550013 with 15.2m @ 3.31 g/t Au & 3.00% Cu (6.91 g/t AuEq) from 286.6m
§ WUC4550032 with 20.9m @ 4.07 g/t Au & 0.49% Cu (4.66 g/t AuEq) from 305.5m
§ WUC4550009A with 22.7m @ 2.71 g/t Au & 1.43% Cu (4.43 g/t AuEq) from 268.6m
§ WUC4550035 with 22.3m @ 2.41 g/t Au & 1.66% Cu (4.40 g/t AuEq) from 326.7m
§ WUC4550023 with 12.5m @ 5.08 g/t Au & 0.52% Cu (5.70 g/t AuEq) from 317.3m
§ WUC4550012 with 9.3m @ 5.44 g/t Au & 1.41% Cu (7.13 g/t AuEq) from 278.0m
§ WUC4550041 with 14.0m @ 2.55 g/t Au & 1.13% Cu (3.90 g/t AuEq) from 291.0m
Additionally, drilling has intercepted several broad zones of stockwork mineralisation within the core of the anticlinal hinge. These zones are interpreted to be similar in style to the large stockwork systems that formed part of the mineralisation targeted by the sub-level cave at the Main Dome Underground. Since these zones were not the primary focus of the initial drilling phase, they will be targeted in future drilling programs.
Significant down hole intercepts within these zones include:
§ WUC4550019 with 42.0m @ 1.97 g/t Au & 0.49% Cu (2.56 g/t AuEq) from 294.0m
§ WUC4550020 with 18.4m @ 3.93 g/t Au & 0.92% Cu (5.03 g/t AuEq) from 330.6m
§ WUC4550023 with 36.1m @ 2.14 g/t Au & 0.21% Cu (2.39 g/t AuEq) from 365.9m
§ WUC4550022 with 31.7m @ 1.34 g/t Au & 0.35% Cu (1.76 g/t AuEq) from 366.0m
§ WUC4550030 with 23.3m @ 1.64 g/t Au & 0.54% Cu (2.39 g/t AuEq) from 341.0m
Figure 2: West Dome Underground Drilling Location
Figure 3: West Dome Underground "Western Limb" Long Section
Figure 4: West Dome Underground Geological Type Section
Next steps
Greatland plans to continue progressing the West Dome Underground Project, with the following planned activities:
§ Phase two drilling program design targeting both infill of the existing mineralisation and continued extensions along strike and down dip, to support definition of a maiden Mineral Resource estimate.
§ Geotechnical and hydrogeological test work to be incorporated in the phase two drilling program to inform planned mining studies.
Subject to positive outcomes from the above work, the existing infrastructure provides the opportunity to accelerate and support economics of the West Dome Underground Project:
§ 1.9km drill drive from the Main Dome Underground already in place, completed in 2024 prior to Greatland ownership.
§ Main Dome underground crusher and haulage shaft have significant surplus capacity that could be accessed by development of a ~ 1.5km haulage drive.
Table 1:West Dome Underground drill collars and significant down hole intercepts.
Note: Significant Intercepts are calculated using a minimum threshold of 0.5 g/t Au and allowing for up to 5m of internal dilution. Only intercepts exceeding 5gm AuEq are included in this report. (gm = gram metre, interval width multiplied by AuEq grade).
|
Drill Program |
Hole ID |
Hole Type |
Collar Details |
From |
To |
Width |
Au (g/t) |
Cu (%) |
AuEq1 |
AuEq (GM)2 |
|||||
|
East |
North |
RL |
Azimuth |
Dip |
Depth |
||||||||||
|
UG Ph1 |
WUC4550007 |
DD |
58771 |
13138 |
4421 |
303 |
6 |
380 |
107.0 |
109.2 |
2.2 |
2.00 |
0.43 |
2.52 |
5 |
|
UG Ph1 |
114.7 |
121.0 |
6.3 |
3.14 |
0.11 |
3.27 |
21 |
||||||||
|
UG Ph1 |
126.0 |
128.5 |
2.5 |
4.24 |
0.04 |
4.28 |
11 |
||||||||
|
UG Ph1 |
259.0 |
318.0 |
59.0 |
2.83 |
0.71 |
3.68 |
217 |
||||||||
|
UG Ph1 |
360.3 |
362.3 |
2.1 |
2.09 |
0.83 |
3.08 |
6 |
||||||||
|
UG Ph1 |
WUC4550008 |
DD |
58771 |
13138 |
4421 |
295.3 |
13 |
410 |
131.0 |
136.7 |
5.7 |
1.01 |
0.06 |
1.08 |
6 |
|
UG Ph1 |
266.0 |
276.0 |
10.0 |
0.64 |
0.05 |
0.70 |
7 |
||||||||
|
UG Ph1 |
311.0 |
319.0 |
8.0 |
0.60 |
0.07 |
0.69 |
5 |
||||||||
|
UG Ph1 |
328.0 |
334.4 |
6.4 |
3.87 |
0.05 |
3.93 |
25 |
||||||||
|
UG Ph1 |
WUC4550009A |
DD |
58771 |
13137 |
4421 |
289.2 |
-2 |
318 |
132.1 |
144.7 |
12.6 |
1.60 |
0.07 |
1.69 |
21 |
|
UG Ph1 |
151.0 |
188.0 |
37.0 |
1.27 |
0.05 |
1.33 |
49 |
||||||||
|
UG Ph1 |
268.6 |
291.3 |
22.7 |
2.71 |
1.43 |
4.43 |
101 |
||||||||
|
UG Ph1 |
WUC4550010 |
DD |
58772 |
13138 |
4421 |
312 |
12 |
400 |
102.6 |
109.5 |
6.8 |
6.88 |
0.39 |
7.35 |
50 |
|
UG Ph1 |
WUC4550012 |
DD |
58772 |
13138 |
4421 |
321.5 |
1.5 |
430 |
126.7 |
130.0 |
3.3 |
1.90 |
0.60 |
2.62 |
9 |
|
UG Ph1 |
278.0 |
287.3 |
9.3 |
5.44 |
1.41 |
7.13 |
66 |
||||||||
|
UG Ph1 |
341.0 |
353.3 |
12.3 |
3.17 |
0.83 |
4.16 |
51 |
||||||||
|
UG Ph1 |
Incl |
323.5 |
336.0 |
12.5 |
3.71 |
1.03 |
4.95 |
62 |
|||||||
|
UG Ph1 |
430 |
370.0 |
375.0 |
5.0 |
6.68 |
0.03 |
6.71 |
34 |
|||||||
|
UG Ph1 |
384.9 |
389.0 |
4.1 |
0.56 |
0.91 |
1.65 |
7 |
||||||||
|
UG Ph1 |
WUC4550013 |
DD |
58771 |
13136 |
4420 |
295.2 |
6 |
380 |
112.0 |
116.6 |
4.6 |
1.49 |
0.02 |
1.52 |
7 |
|
UG Ph1 |
286.6 |
301.8 |
15.2 |
3.31 |
3.00 |
6.91 |
105 |
||||||||
|
UG Ph1 |
323.0 |
324.0 |
1.0 |
7.87 |
0.65 |
8.65 |
9 |
||||||||
|
UG Ph1 |
354.5 |
377.4 |
22.9 |
0.65 |
0.11 |
0.79 |
18 |
||||||||
|
UG Ph1 |
WUC4550016 |
DD |
58770 |
13105 |
4420 |
341.2 |
4 |
354 |
152.3 |
161.0 |
8.7 |
0.75 |
0.05 |
0.81 |
7 |
|
UG Ph1 |
179.0 |
180.0 |
1.0 |
5.37 |
0.00 |
5.37 |
5 |
||||||||
|
UG Ph1 |
223.2 |
237.0 |
13.9 |
2.83 |
0.28 |
3.17 |
44 |
||||||||
|
UG Ph1 |
300.2 |
321.0 |
20.9 |
4.27 |
2.77 |
7.59 |
158 |
||||||||
|
UG Ph1 |
344.4 |
344.8 |
0.4 |
17.60 |
5.91 |
24.69 |
9 |
||||||||
|
UG Ph1 |
WUC4550017 |
DD |
58770 |
13105 |
4421 |
274.7 |
-1 |
155 |
drillhole failed to reach target |
||||||
|
UG Ph1 |
WUC4550018 |
DD |
58770 |
13105 |
4420 |
278.5 |
21 |
423 |
175.0 |
183.0 |
8.0 |
1.27 |
0.10 |
1.39 |
11 |
|
UG Ph1 |
198.0 |
206.5 |
8.5 |
0.63 |
0.60 |
1.35 |
11 |
||||||||
|
UG Ph1 |
294.0 |
325.0 |
31.0 |
1.18 |
0.38 |
1.63 |
51 |
||||||||
|
UG Ph1 |
376.0 |
382.5 |
6.5 |
1.05 |
0.25 |
1.35 |
9 |
||||||||
|
UG Ph1 |
WUC4550019 |
DD |
58770 |
13104 |
4420 |
281 |
11 |
390 |
269.0 |
287.1 |
18.1 |
1.53 |
0.08 |
1.63 |
30 |
|
UG Ph1 |
294.0 |
336.0 |
42.0 |
1.97 |
0.49 |
2.56 |
107 |
||||||||
|
UG Ph1 |
WUC4550020 |
DD |
58770 |
13105 |
4420 |
274.6 |
14 |
428 |
272.9 |
282.9 |
10.0 |
0.64 |
0.09 |
0.75 |
7 |
|
UG Ph1 |
305.8 |
315.0 |
9.2 |
2.01 |
0.15 |
2.19 |
20 |
||||||||
|
UG Ph1 |
330.6 |
349.0 |
18.4 |
3.93 |
0.92 |
5.03 |
93 |
||||||||
|
UG Ph1 |
WUC4550021 |
|
58771 |
13114 |
4420 |
274.6 |
14 |
429 |
113.7 |
121.0 |
7.3 |
0.55 |
0.47 |
1.11 |
8 |
|
UG Ph1 |
308.0 |
318.5 |
10.5 |
0.51 |
0.51 |
1.12 |
12 |
||||||||
|
UG Ph1 |
WUC4550022 |
DD |
58771 |
13113 |
4420 |
289.5 |
6.5 |
400 |
121.7 |
128.2 |
6.6 |
1.64 |
1.14 |
3.01 |
20 |
|
UG Ph1 |
159.9 |
161.3 |
1.4 |
7.16 |
0.07 |
7.24 |
10 |
||||||||
|
UG Ph1 |
228.7 |
234.0 |
5.3 |
0.87 |
0.09 |
0.98 |
5 |
||||||||
|
UG Ph1 |
290.4 |
304.7 |
14.3 |
9.06 |
8.57 |
19.34 |
277 |
||||||||
|
UG Ph1 |
347.5 |
352.6 |
5.1 |
1.39 |
1.18 |
2.81 |
14 |
||||||||
|
UG Ph1 |
366.0 |
397.7 |
31.7 |
1.34 |
0.35 |
1.76 |
56 |
||||||||
|
UG Ph1 |
WUC4550023 |
DD |
58784 |
13038 |
4422 |
248.5 |
11.5 |
516 |
53.0 |
54.0 |
1.0 |
11.40 |
0.13 |
11.56 |
12 |
|
UG Ph1 |
205.0 |
212.5 |
7.4 |
1.23 |
0.31 |
1.60 |
12 |
||||||||
|
UG Ph1 |
317.3 |
329.7 |
12.5 |
5.08 |
0.52 |
5.70 |
71 |
||||||||
|
UG Ph1 |
365.9 |
402.0 |
36.1 |
2.14 |
0.21 |
2.39 |
86 |
||||||||
|
UG Ph1 |
408.0 |
416.0 |
8.0 |
3.60 |
0.50 |
4.20 |
34 |
||||||||
|
UG Ph1 |
WUC4550030 |
DD |
58783 |
13063 |
4421 |
270.6 |
14 |
429 |
147.0 |
164.0 |
17.0 |
0.54 |
0.13 |
0.69 |
12 |
|
UG Ph1 |
182.8 |
188.7 |
5.9 |
1.04 |
0.61 |
1.77 |
11 |
||||||||
|
UG Ph1 |
319.0 |
325.0 |
6.0 |
1.02 |
0.01 |
1.03 |
6 |
||||||||
|
UG Ph1 |
341.0 |
364.3 |
23.3 |
1.64 |
0.54 |
2.29 |
53 |
||||||||
|
UG Ph1 |
370.0 |
381.8 |
11.8 |
2.09 |
0.15 |
2.27 |
27 |
||||||||
|
UG Ph1 |
WUC4550032 |
DD |
58783 |
13062 |
4422 |
267.4 |
9.8 |
425 |
117.0 |
118.0 |
1.0 |
27.30 |
0.02 |
27.32 |
27 |
|
UG Ph1 |
157.5 |
163.0 |
5.5 |
1.92 |
0.06 |
1.99 |
11 |
||||||||
|
UG Ph1 |
171.1 |
181.0 |
9.9 |
0.55 |
0.07 |
0.63 |
6 |
||||||||
|
UG Ph1 |
282.3 |
294.0 |
11.7 |
0.86 |
0.01 |
0.87 |
10 |
||||||||
|
UG Ph1 |
305.5 |
326.4 |
20.9 |
4.07 |
0.49 |
4.66 |
98 |
||||||||
|
UG Ph1 |
336.9 |
360.0 |
23.1 |
1.13 |
0.49 |
1.72 |
40 |
||||||||
|
UG Ph1 |
399.0 |
408.0 |
9.0 |
2.91 |
0.24 |
3.19 |
29 |
||||||||
|
UG Ph1 |
421.1 |
423.0 |
1.9 |
5.24 |
1.12 |
6.58 |
13 |
||||||||
|
UG Ph1 |
WUC4550035 |
DD |
58783 |
13062 |
4422 |
261 |
11.3 |
460 |
163.8 |
169.4 |
5.7 |
1.17 |
0.21 |
1.42 |
8 |
|
UG Ph1 |
213.5 |
221.0 |
7.5 |
0.73 |
0.04 |
0.78 |
6 |
||||||||
|
UG Ph1 |
246.0 |
246.5 |
0.5 |
28.80 |
0.02 |
28.82 |
16 |
||||||||
|
UG Ph1 |
266.0 |
286.0 |
20.0 |
2.47 |
0.03 |
2.50 |
50 |
||||||||
|
UG Ph1 |
326.7 |
349.0 |
22.3 |
2.41 |
1.66 |
4.40 |
98 |
||||||||
|
UG Ph1 |
354.6 |
355.2 |
0.6 |
5.87 |
2.48 |
8.85 |
5 |
||||||||
|
UG Ph1 |
361.0 |
367.0 |
6.0 |
3.37 |
0.26 |
3.68 |
22 |
||||||||
|
UG Ph1 |
374.0 |
386.1 |
12.1 |
0.92 |
0.64 |
1.69 |
20 |
||||||||
|
UG Ph1 |
407.0 |
407.3 |
0.3 |
32.20 |
0.85 |
33.22 |
10 |
||||||||
|
UG Ph1 |
426.6 |
436.0 |
9.4 |
0.51 |
0.07 |
0.59 |
6 |
||||||||
|
UG Ph1 |
WUC4550040 |
DD |
58771 |
13104 |
4420 |
276 |
3.5 |
376 |
140.9 |
142.9 |
2.0 |
10.01 |
0.07 |
10.09 |
20 |
|
UG Ph1 |
203.0 |
230.0 |
27.0 |
0.70 |
0.22 |
0.96 |
26 |
||||||||
|
UG Ph1 |
268.0 |
279.0 |
11.0 |
1.72 |
0.86 |
2.75 |
30 |
||||||||
|
UG Ph1 |
284.7 |
316.3 |
31.6 |
3.09 |
0.60 |
3.81 |
120 |
||||||||
|
UG Ph1 |
WUC4550041 |
DD |
58771 |
13138 |
4421 |
299.4 |
2.5 |
370 |
114.0 |
122.4 |
8.4 |
1.23 |
0.07 |
1.32 |
11 |
|
UG Ph1 |
190.0 |
191.0 |
1.0 |
6.82 |
0.01 |
6.83 |
7 |
||||||||
|
UG Ph1 |
291.0 |
305.0 |
14.0 |
2.55 |
1.13 |
3.90 |
55 |
||||||||
|
UG Ph1 |
348.7 |
364.0 |
15.3 |
0.71 |
0.37 |
1.16 |
18 |
||||||||
|
Historic |
WRC34101 |
DD |
59013 |
13417 |
5519 |
229 |
77 |
1543 |
1497.0 |
1504.0 |
7.0 |
1.27 |
0.04 |
1.32 |
9 |
|
Historic |
WRC33404W1 |
DD |
58528 |
13351 |
5372 |
183.5 |
70.5 |
1243 |
903.8 |
915.7 |
11.9 |
1.50 |
0.01 |
1.51 |
18 |
|
Historic |
922 |
923.2 |
1.1 |
5.70 |
0.08 |
5.80 |
7 |
||||||||
|
Historic |
931.8 |
946 |
14.2 |
0.93 |
0.13 |
1.09 |
15 |
||||||||
|
Historic |
957.1 |
958.1 |
1.0 |
7.41 |
3.45 |
11.55 |
11 |
||||||||
|
Historic |
972.9 |
983 |
10.1 |
3.91 |
0.02 |
3.93 |
40 |
||||||||
|
Historic |
1076.7 |
1091 |
14.3 |
0.45 |
0.06 |
0.52 |
7 |
||||||||
|
Historic |
1152 |
1157.7 |
5.8 |
0.75 |
0.11 |
0.88 |
5 |
||||||||
|
Historic |
WRC32801A |
DD |
57649 |
13289 |
5512 |
94 |
80.5 |
1870 |
1156.7 |
1164.5 |
7.8 |
0.56 |
0.16 |
0.75 |
6 |
|
Historic |
1681.7 |
1689.1 |
7.4 |
1.38 |
1.60 |
3.30 |
25 |
||||||||
|
Historic |
1695.9 |
1702 |
6.2 |
0.58 |
0.50 |
1.18 |
7 |
||||||||
|
Historic |
1713.7 |
1721 |
7.3 |
0.71 |
0.78 |
1.64 |
12 |
||||||||
|
Historic |
1721.1 |
1722.4 |
1.3 |
8.96 |
4.39 |
14.23 |
18 |
||||||||
|
Historic |
1730.7 |
1734 |
3.3 |
1.96 |
0.10 |
2.08 |
7 |
||||||||
|
Historic |
1768 |
1787 |
19.0 |
0.70 |
0.61 |
1.43 |
27 |
||||||||
|
Historic |
1796.5 |
1810.5 |
14.0 |
1.17 |
0.28 |
1.51 |
21 |
||||||||
|
Historic |
1844.9 |
1867 |
22.1 |
1.06 |
0.08 |
1.15 |
25 |
||||||||
|
Historic |
WRC30582W1 |
DD |
58761 |
13037 |
5439 |
262 |
87 |
1679 |
883 |
884 |
1.0 |
13.60 |
1.46 |
15.35 |
15 |
|
Historic |
1611 |
1612 |
1.0 |
6.36 |
0.51 |
6.97 |
7 |
||||||||
|
Historic |
1390 |
1396.6 |
6.6 |
0.90 |
0.09 |
1.00 |
7 |
||||||||
|
Historic |
1252 |
1256 |
4.0 |
1.32 |
0.07 |
1.40 |
6 |
||||||||
|
Historic |
1362.5 |
1377 |
14.5 |
0.76 |
0.09 |
0.87 |
13 |
||||||||
|
Historic |
1546 |
1559 |
13.0 |
0.77 |
0.08 |
0.87 |
11 |
||||||||
|
Historic |
1420 |
1424 |
4.0 |
1.35 |
0.11 |
1.48 |
6 |
||||||||
|
Historic |
WRC28605B |
DD |
59234 |
12825 |
5521 |
262 |
72.1 |
1702 |
1357.5 |
1370 |
12.5 |
1.87 |
0.31 |
2.24 |
28 |
|
Historic |
1389 |
1417 |
28.0 |
0.29 |
0.09 |
0.40 |
11 |
||||||||
|
Historic |
1541 |
1551.3 |
10.3 |
0.37 |
0.18 |
0.59 |
6 |
||||||||
|
Historic |
1565 |
1577 |
12.0 |
1.18 |
0.59 |
1.89 |
23 |
||||||||
|
Historic |
1601.5 |
1609 |
7.5 |
1.25 |
0.10 |
1.37 |
10 |
||||||||
|
Historic |
WRC28048W4 |
DD |
59265 |
12799 |
5521 |
216.25 |
71.88 |
1776 |
1414 |
1415 |
1.0 |
15.67 |
0.03 |
15.71 |
16 |
|
Historic |
1499.8 |
1511.8 |
12.0 |
0.39 |
0.05 |
0.45 |
5 |
||||||||
|
Historic |
1636 |
1641.6 |
5.6 |
2.86 |
0.03 |
2.89 |
16 |
||||||||
|
Historic |
1657 |
1669.5 |
12.5 |
1.60 |
0.22 |
1.86 |
23 |
||||||||
|
Historic |
1753.7 |
1756 |
2.3 |
3.17 |
0.08 |
3.27 |
8 |
||||||||
|
Historic |
WRC28048W2 |
DD |
59265 |
12799 |
5521 |
216 |
70 |
1801 |
1286 |
1286.5 |
0.5 |
11.64 |
0.06 |
11.71 |
6 |
|
Historic |
1592 |
1602.0 |
10.0 |
1.37 |
0.32 |
1.75 |
18 |
||||||||
|
Historic |
1614.6 |
1621.3 |
6.7 |
1.45 |
0.26 |
1.77 |
12 |
||||||||
|
Historic |
1645.9 |
1653 |
7.1 |
2.97 |
0.25 |
3.27 |
23 |
||||||||
|
Historic |
WRC28048W1 |
DD |
59265 |
12799 |
5521 |
216 |
70 |
1670 |
1626 |
1648 |
22.0 |
0.38 |
0.05 |
0.44 |
10 |
|
Historic |
859 |
860 |
1.0 |
5.62 |
0.02 |
5.64 |
6 |
||||||||
|
Historic |
1130.6 |
1136.8 |
6.2 |
1.48 |
0.03 |
1.51 |
9 |
||||||||
|
Historic |
1321 |
1329 |
8.0 |
16.03 |
0.23 |
16.31 |
130 |
||||||||
|
Historic |
1335 |
1336 |
1.0 |
5.70 |
0.05 |
5.76 |
6 |
||||||||
|
Historic |
1353.6 |
1356 |
2.4 |
1.98 |
0.09 |
2.09 |
5 |
||||||||
|
Historic |
1390.7 |
1400 |
9.3 |
0.54 |
0.28 |
0.88 |
8 |
||||||||
|
Historic |
1528 |
1531 |
3.0 |
1.73 |
0.08 |
1.83 |
5 |
||||||||
|
Historic |
WRC31558 |
DD |
58150 |
13150 |
5517 |
90 |
85 |
1850 |
1195.2 |
1228 |
32.8 |
2.05 |
0.48 |
2.63 |
86 |
|
Historic |
1274.0 |
1287.9 |
13.9 |
0.90 |
0.57 |
1.58 |
22 |
||||||||
|
Historic |
1299.7 |
1307 |
7.3 |
0.54 |
0.91 |
1.63 |
12 |
||||||||
|
Historic |
1404.8 |
1407.8 |
3.0 |
1.64 |
0.42 |
2.14 |
6 |
||||||||
|
Historic |
1519.2 |
1523.3 |
4.0 |
4.89 |
0.74 |
5.78 |
23 |
||||||||
|
Historic |
1542.4 |
1549.5 |
7.1 |
0.58 |
0.16 |
0.77 |
5 |
||||||||
|
Historic |
1595.8 |
1596.5 |
0.8 |
7.20 |
0.73 |
8.08 |
6 |
||||||||
|
Historic |
1669.6 |
1679 |
9.4 |
1.33 |
0.25 |
1.63 |
15 |
||||||||
|
Historic |
WRC33901 |
DD |
58118 |
13394 |
5517 |
89 |
75.5 |
1330 |
1050.3 |
1060.1 |
9.8 |
1.57 |
0.18 |
1.79 |
17 |
|
Historic |
1050.3 |
1060.1 |
9.8 |
1.57 |
0.18 |
1.79 |
17 |
||||||||
|
Historic |
1090.3 |
1111 |
20.8 |
0.65 |
0.13 |
0.81 |
17 |
||||||||
|
Historic |
1090.3 |
1111 |
20.8 |
0.65 |
0.13 |
0.81 |
17 |
||||||||
|
Historic |
1119 |
1129.1 |
10.1 |
0.73 |
0.27 |
1.05 |
11 |
||||||||
|
Historic |
1119 |
1129.1 |
10.1 |
0.73 |
0.27 |
1.05 |
11 |
||||||||
|
Historic |
1216 |
1235.3 |
19.3 |
2.03 |
0.06 |
2.10 |
41 |
||||||||
|
Historic |
1216 |
1235.3 |
19.3 |
2.03 |
0.06 |
2.10 |
41 |
||||||||
|
Historic |
WRC31561 |
DD |
58831 |
13150 |
5485 |
270 |
-70 |
1713 |
1170.4 |
1175.3 |
4.9 |
1.56 |
1.36 |
3.19 |
16 |
|
Historic |
1190 |
1200 |
10.0 |
0.90 |
0.28 |
1.24 |
12 |
||||||||
|
Historic |
1266.1 |
1269 |
2.9 |
1.46 |
0.28 |
1.80 |
5 |
||||||||
|
Historic |
1290.2 |
1290.7 |
0.6 |
58.50 |
0.08 |
58.60 |
32 |
||||||||
|
Historic |
WRC34081 |
DD |
58068 |
13422 |
5515 |
90 |
85 |
1519 |
891 |
908 |
17.0 |
1.08 |
0.05 |
1.14 |
19 |
|
Historic |
1182 |
1189 |
7.0 |
0.97 |
0.04 |
1.02 |
7 |
||||||||
|
Historic |
1216 |
1219.1 |
3.1 |
0.96 |
1.67 |
2.96 |
9 |
||||||||
|
Historic |
1225.7 |
1246.1 |
20.4 |
5.17 |
0.39 |
5.64 |
115 |
||||||||
|
Historic |
1482 |
1489 |
7.0 |
1.57 |
0.04 |
1.62 |
11 |
||||||||
|
Historic |
W32736W1 |
DD |
57952 |
13254 |
5524 |
90 |
85 |
1411 |
762 |
764 |
2.0 |
4.29 |
0.13 |
4.45 |
9 |
|
Historic |
771 |
781 |
10.0 |
0.94 |
0.14 |
1.11 |
11 |
||||||||
|
Historic |
941.9 |
949 |
7.1 |
0.88 |
0.04 |
0.93 |
7 |
||||||||
|
Historic |
1231 |
1238 |
7.0 |
1.82 |
0.22 |
2.08 |
15 |
||||||||
|
Historic |
1256 |
1283.1 |
27.1 |
1.31 |
0.76 |
2.22 |
60 |
||||||||
|
Historic |
1291.4 |
1293 |
1.6 |
1.56 |
1.81 |
3.73 |
6 |
||||||||
|
Historic |
W27563W1 |
DD |
57964 |
12751 |
5528 |
80 |
-85.33 |
1479 |
1091 |
1109.1 |
18.1 |
0.78 |
0.01 |
0.79 |
14 |
|
Historic |
1285 |
1301.2 |
16.2 |
1.52 |
0.16 |
1.71 |
28 |
||||||||
|
Historic |
1318 |
1346 |
28.0 |
0.96 |
0.16 |
1.15 |
32 |
||||||||
|
Historic |
WRC30070 |
DD |
57965 |
13044 |
5512 |
94 |
-85 |
1509 |
694.3 |
699.6 |
5.3 |
13.48 |
0.14 |
13.65 |
72 |
|
Historic |
718.9 |
736 |
17.0 |
2.05 |
0.31 |
2.42 |
41 |
||||||||
|
Historic |
744.7 |
749.2 |
4.6 |
0.96 |
0.66 |
1.75 |
8 |
||||||||
|
Historic |
847.5 |
851 |
3.5 |
3.01 |
0.26 |
3.32 |
11 |
||||||||
|
Historic |
980.9 |
992 |
11.1 |
1.02 |
0.04 |
1.07 |
12 |
||||||||
|
Historic |
1024.3 |
1033.4 |
9.0 |
3.65 |
0.03 |
3.69 |
33 |
||||||||
|
Historic |
1041.9 |
1073 |
31.1 |
0.85 |
0.03 |
0.89 |
28 |
||||||||
|
Historic |
1093 |
1104 |
11.0 |
0.50 |
0.03 |
0.54 |
6 |
||||||||
|
Historic |
1291 |
1326 |
35.0 |
3.30 |
0.24 |
3.59 |
126 |
||||||||
|
Historic |
1334 |
1342 |
8.0 |
0.54 |
0.10 |
0.66 |
5 |
||||||||
|
Historic |
1375 |
1377.9 |
2.9 |
0.76 |
1.06 |
2.03 |
6 |
||||||||
|
Historic |
1403 |
1413.6 |
10.6 |
1.93 |
0.95 |
3.07 |
32 |
||||||||
|
Historic |
1441.8 |
1454 |
12.2 |
1.47 |
0.13 |
1.63 |
20 |
||||||||
|
Historic |
1481.3 |
1487 |
5.8 |
2.14 |
0.15 |
2.32 |
13 |
||||||||
|
Historic |
W30070W1 |
DD |
57965 |
13044 |
5512 |
94 |
-85 |
1520 |
844 |
854.4 |
10.4 |
0.86 |
0.06 |
0.93 |
10 |
|
Historic |
877 |
879 |
2.0 |
3.49 |
0.01 |
3.50 |
7 |
||||||||
|
Historic |
889 |
892 |
3.0 |
1.74 |
0.01 |
1.75 |
5 |
||||||||
|
Historic |
983.1 |
993 |
9.9 |
0.78 |
0.06 |
0.85 |
8 |
||||||||
|
Historic |
1024 |
1055.4 |
31.4 |
0.85 |
0.02 |
0.87 |
27 |
||||||||
|
Historic |
1109 |
1114.9 |
5.9 |
1.16 |
0.05 |
1.22 |
7 |
||||||||
|
Historic |
1190.4 |
1191.4 |
0.9 |
12.52 |
0.01 |
12.53 |
12 |
||||||||
|
Historic |
1261 |
1274 |
13.0 |
2.06 |
0.67 |
2.86 |
37 |
||||||||
|
Historic |
1284.3 |
1305 |
20.7 |
1.65 |
0.49 |
2.24 |
46 |
||||||||
|
Historic |
W31567W1 |
DD |
57944 |
13158 |
5524 |
90 |
-85 |
1639 |
975 |
983 |
8.0 |
0.97 |
0.01 |
0.98 |
8 |
|
Historic |
988.6 |
998 |
9.4 |
0.60 |
0.00 |
0.60 |
6 |
||||||||
|
Historic |
1050.7 |
1082 |
31.3 |
4.43 |
0.03 |
4.47 |
140 |
||||||||
|
Historic |
1214.0 |
1221 |
7.0 |
0.94 |
0.17 |
1.14 |
8 |
||||||||
|
Historic |
1306.1 |
1331 |
24.9 |
2.24 |
0.49 |
2.83 |
70 |
||||||||
|
Historic |
1353 |
1362.8 |
9.8 |
0.53 |
0.21 |
0.78 |
8 |
||||||||
|
Historic |
1390.8 |
1426 |
35.2 |
2.21 |
0.71 |
3.06 |
108 |
||||||||
|
Historic |
1433 |
1453 |
20.0 |
0.52 |
0.16 |
0.71 |
14 |
||||||||
|
Historic |
1472.2 |
1475 |
2.8 |
0.69 |
1.96 |
3.04 |
9 |
||||||||
|
Historic |
1533.9 |
1537 |
3.1 |
9.58 |
1.02 |
10.80 |
33 |
||||||||
|
Historic |
1553.8 |
1558 |
4.2 |
0.88 |
0.81 |
1.85 |
8 |
||||||||
|
Historic |
1575.6 |
1590 |
14.4 |
1.73 |
0.18 |
1.95 |
28 |
||||||||
|
Historic |
WRC29044 |
DD |
57964 |
12904 |
5530 |
90 |
-85 |
1550 |
1100 |
1101 |
1.0 |
5.59 |
0.00 |
5.59 |
6 |
|
Historic |
1100 |
1110 |
10.0 |
1.06 |
0.01 |
1.07 |
11 |
||||||||
|
Historic |
1119 |
1142 |
22.6 |
0.93 |
0.00 |
0.93 |
21 |
||||||||
|
Historic |
1177 |
1230 |
53.0 |
1.32 |
0.06 |
1.39 |
74 |
||||||||
|
Historic |
1200 |
1201 |
1.0 |
5.98 |
0.04 |
6.03 |
6 |
||||||||
|
Historic |
1212 |
1214 |
2.0 |
15.08 |
0.16 |
15.27 |
31 |
||||||||
|
Historic |
1226.9 |
1228 |
1.2 |
5.42 |
0.14 |
5.59 |
6 |
||||||||
|
Historic |
1292 |
1297 |
5.0 |
1.59 |
0.04 |
1.64 |
8 |
||||||||
|
Historic |
1319.7 |
1321 |
1.4 |
21.56 |
0.10 |
21.68 |
29 |
||||||||
|
Historic |
1319.7 |
1332 |
12.4 |
11.08 |
0.32 |
11.46 |
142 |
||||||||
|
Historic |
1322 |
1324 |
2.0 |
16.18 |
0.17 |
16.38 |
33 |
||||||||
|
Historic |
1325 |
1326.7 |
1.7 |
26.89 |
0.71 |
27.74 |
46 |
||||||||
|
Historic |
1327 |
1328 |
1.0 |
7.73 |
0.35 |
8.15 |
8 |
||||||||
|
Historic |
1331 |
1332 |
1.0 |
14.51 |
0.14 |
14.68 |
15 |
||||||||
Footnotes:
1 The gold equivalent (AuEq) is based on assumed prices of AUD$3,150/oz Au and AUD$5.30/lb Cu and metallurgical recoveries based on block metal grade, reporting approximately at 85% for Au and 90% for Cu which equates to a formula of approximately AuEq = Au (g/t) + 1.2* Cu (%). It is the company's opinion that all the elements included in the metal equivalents calculation have a reasonable potential to be recovered and sold.
2 Gold equivalent Gram metres (AuEq GM) are calculated by multiplying the intercept width by the gold equivalent grade.
Contact
For further information, please contact:
Greatland Gold plc
Shaun Day, Managing Director | Rowan Krasnoff, Head of Business Development
info@greatlandgold.com
Nominated Advisor
SPARK Advisory Partners
Andrew Emmott / James Keeshan / Neil Baldwin | +44 203 368 3550
Corporate Brokers
Canaccord Genuity | James Asensio / George Grainger | +44 207 523 8000
SI Capital Limited | Nick Emerson / Sam Lomanto | +44 148 341 3500
Media Relations
Australia - Fivemark Partners | Michael Vaughan | +61 422 602 720
UK - Gracechurch Group | Harry Chathli / Alexis Gore / Henry Gamble | +44 204 582 3500
About Greatland
Greatland is a gold and copper mining company listed on the London Stock Exchange's AIM Market (LSE:GGP) and operates its business from Western Australia.
The Greatland portfolio includes the 100% owned Telfer gold-copper mine, the adjacent 100% owned world class Havieron gold-copper project (under development), and a significant exploration portfolio within the surrounding region. The combination of Telfer and Havieron provides for a substantial and long life gold-copper operation in the Paterson Province of Western Australia.
Greatland is targeting a cross listing on the ASX in the June quarter 2025.
Forward Looking Statements
This document includes forward looking statements and forward looking information within the meaning of securities laws of applicable jurisdictions. Forward looking statements can generally be identified by the use of words such as "may", "will", "expect", "intend", "plan", "estimate", "anticipate", "believe", "continue", "objectives", "targets", "outlook" and "guidance", or other similar words and may include, without limitation, statements regarding estimated reserves and resources, certain plans, strategies, aspirations and objectives of management, anticipated production, study or construction dates, expected costs, cash flow or production outputs and anticipated productive lives of projects and mines.
These forward looking statements involve known and unknown risks, uncertainties and other factors that may cause actual results, performance and achievements or industry results to differ materially from any future results, performance or achievements, or industry results, expressed or implied by these forward-looking statements. Relevant factors may include, but are not limited to, changes in commodity prices, foreign exchange fluctuations and general economic conditions, increased costs and demand for production inputs, the speculative nature of exploration and project development, including the risks of obtaining necessary licences and permits and diminishing quantities or grades of reserves, political and social risks, changes to the regulatory framework within which Greatland operates or may in the future operate, environmental conditions including extreme weather conditions, recruitment and retention of personnel, industrial relations issues and litigation.
Forward looking statements are based on assumptions as to the financial, market, regulatory and other relevant environments that will exist and affect Greatland's business and operations in the future. Greatland does not give any assurance that the assumptions will prove to be correct. There may be other factors that could cause actual results or events not to be as anticipated, and many events are beyond the reasonable control of Greatland. Forward looking statements in this document speak only at the date of issue. Greatland does not undertake any obligation to update or revise any of the forward looking statements or to advise of any change in assumptions on which any such statement is based.
Competent Persons Statement
Information in this announcement has been reviewed and approved by Mr Michael Thomson, a Member of the Australian Institute of Geoscientists (AIG), who has more than 20 years relevant industry experience. Mr Thomson, an employee of the Company, has sufficient experience relevant to the style of mineralisation, type of deposit under consideration, and to the activity which he is undertaking to qualify as a Competent Person as defined by the 2012 Edition of the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (the JORC Code) and under the AIM Rules - Note for Mining and Oil & Gas Companies, which outline standards of disclosure for mineral projects. Mr Thomson consents to the inclusion in this announcement of the matters based on this information in the form and context in which it appears.
JORC 2012 - Table 1
Section 1 - Sampling Techniques and Data
|
Criteria |
Commentary |
|
Sampling techniques |
Drilling for resource definition and grade control typically includes a combination of surface reverse circulation (RC) and surface and underground diamond (DD) drilling. These activities are conducted periodically throughout the mine's history. Core sizes for resource definition drilling usually range from NQ to PQ, while grade control drilling is generally carried out with smaller core sizes, such as NQ or LTK60. Diamond drilling samples are collected based on lithological units, with sample lengths ranging from a maximum of 1.2 meters to a minimum of 0.2 meters, although 1-meter intervals are most common. NQ and larger cores are typically cut and half-sampled (with half retained), while smaller cores are often sampled whole. RC drilling samples are usually collected at 1-meter intervals and split using a riffle or cone splitter attached to the drill rig cyclone, producing a 2 to 5 kg primary sample. The bulk reject from splitting is retained in numbered bags for temporary storage and logging. In some cases, RC samples are collected as 2-meter composites, while earlier procedures or specific reef zones reduced the sample interval to 0.5 meters. Rock chip samples are gathered manually using hand tools, such as geo-picks, from exposed development faces. These samples are typically collected perpendicular to bedding and include all relevant domains, such as reef, hanging wall, and footwall. Samples are around 2-3 kg and stored in pre-numbered bags.
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Drilling techniques |
The drilling methods used included various core diameters, with a focus on HQ/HQ3, NQ/NQ2, and LTK60, along with limited use of PQ and BQ core. There is also limited amount of RC drilling, mainly in the upper parts of the mine. All drilling within the West Dome underground has been completed with diamond drilling
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Drill sample recovery |
Core recovery data from diamond drilling is systematically recorded by comparing drillers' depth blocks in core trays with database records. Between January 1, 2018, and June 30, 2019, a total of 605 diamond drill holes (including four with RC tails) were completed. Detailed core recovery data is available for 346 drill holes (57%). Additionally, recovery data is not recorded for RC drilling. Recovery data was collected for all recent drill holes into the West Dome Underground.
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Logging |
Geological logging is conducted on all diamond and reverse circulation drill holes, covering lithology, alteration, mineralisation, veining, and structure (for diamond core). All drill core is photographed before sampling. The database contains over 1,000 km of logged geology, representing around 80% of total drilling. Rock Quality Designation (RQD) is routinely logged, with approximately 900 diamond holes geotechnically assessed. The level of detail is appropriate for resource estimation and related studies.
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Sub-sampling techniques and sample preparation |
Sampling and quality control protocols are appropriate for the material being sampled. Diamond core is cut and sampled as specified, while RC sampling is typically conducted on dry samples, with condition recorded. Since 2015, RC samples have been split using cone splitters instead of riffle splitters. Field duplicates are collected at a rate of 1 in 20 samples. Sample preparation and assay processes have varied over time. From 2000 to 2003, samples were sent to Perth for processing. Since 2003, most samples have been processed at the Telfer laboratory using drying, crushing, and pulverizing techniques, with standards improving over the years. Due to new requirements and capacity constraints, commercial labs are predominately used for samples that will inform a mineral resource estimate while the Telfer lab remained focused on grade control drilling and face samples. |
|
Quality of assay data and laboratory tests |
Assay processes at Telfer have been conducted to industry standards (at the time), with samples analysed at both the Telfer laboratory and commercial laboratories. Prior to 1998, assay quality control followed industry standards of that time, with no significant quality concerns identified. Since then, protocols have been updated to align with industry advancements. Samples are typically prepared at the Telfer lab and sent to external laboratories for analysis.. Gold is primarily analysed via fire assay, while multi-element analysis (Ag, As, Bi, Cu, Fe, Ni, Pb, S, Zn) is performed using ICPMS/AES following aqua-regia or four-acid digestion. Since 1998, quality control procedures have included the use of Certified Reference Materials (CRMs), blanks, and duplicates, as well as sample resubmission and laboratory inspections. Matrix-matched CRMs have been in use since 1999, with a shift toward multi-client CRMs since 2018. QAQC results are assessed continuously, with investigations and re-assaying conducted when necessary. Overall, assay techniques and QAQC protocols are considered appropriate for use in a Mineral Resource estimate, with data accuracy and precision maintained throughout the process
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Verification of sampling and assaying |
Significant intersections have been verified by company personnel and the competent person. Drill hole data is securely stored in an acQuire database, with strict controls in place to prevent errors or duplication. Automated validation checks are performed, and data integrity is overseen by senior geologists. Data entry methods have evolved with technology, from paper templates and Excel spreadsheets to direct digital entry into acQuire. Internal reviews by site teams and resource personnel ensure data quality before resource estimation, complemented by external reviews. The Telfer Lab undergoes monthly audits, while commercial laboratories are audited quarterly. |
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Location of data points |
Greatland Golds Telfer Gold Mine reports periodically to the WA Department of Industry and Resources (DOIR), using the MGA94/AHD coordinate system for all maps and digital data. However, mining operations use the Telfer Mine Grid (TMG) and Telfer Height Datum (THD). Topographic control is maintained through surface and aerial surveys, with routine pit and underground surveys. Drill hole collars are surveyed upon hole completion. Downhole survey methods have evolved over time, from single-shot Eastman cameras before 2004 to electronic single-shot tools from 2006 and multi-shot tools from 2009. Currently, drill holes are surveyed at 30m intervals during drilling, with detailed multi-shot surveys taken every 6m post-completion using a Reflex EZ-Trac tool. |
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Data spacing and distribution |
The drill spacing applied to specific mineralised domains within the overall resource is variable and is considered suitable for the style of mineralisation and mineral resource estimation requirements. Within the West Dome Underground drilling spacing varies from 50m to >200m. |
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Orientation of data in relation to geological structure |
The Telfer mine site features two large asymmetric dome structures: Main Dome in the southeast and West Dome in the northwest. Both structures have steeply dipping axial planes, with shallow to moderate western limbs and moderate to steep eastern limbs. Main Dome extends approximately 3 km north-south and 2 km east-west before plunging under cover, while West Dome has similar dimensions. Surface drilling is designed to achieve optimal intersection angles with the reefs, while underground drilling is planned within the constraints of available collar locations. No orientation bias has been identified in the drilling data.
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Sample security |
Sample security is maintained through a tracking system from the drill rig to the database. Historically, RC and diamond core drill hole samples were barcoded by drill hole, but this practice has been discontinued. Currently, resource development and underground drilling samples are collected in pre-numbered calico bags. All sample movements are recorded in a database, including dispatch dates, Hole ID, sample ranges, and requested analytical tests. Any discrepancies identified upon receipt at the laboratory are validated to ensure data integrity. |
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Audits or reviews |
In-house reviews of data, QAQC results, sampling protocols and compliance with corporate and site protocols are carried out at various frequencies by company employees. Procedure audits and reviews are carried out by corporate employees during site visits. |
Section 2 - Reporting of Exploration Results
|
Criteria |
Commentary |
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Mineral tenement and land tenure status |
Mining and ore processing at Telfer are conducted under granted leases and licenses covering all key infrastructure. The Telfer Main Dome Underground Mineral Resource is within mining leases M45/6 and M45/8, while the West Dome Underground target, located about 3 km northwest of the Main Dome open pit, lies within mining leases M45/7 and M45/33. All these leases are currently under renewal. An Indigenous Land Use Agreement (ILUA) has been in place since December 2015, and the site remains compliant with the Mining Rehabilitation Fund (MRF) levy
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Exploration done by other parties |
The Telfer district was first geologically mapped by the Bureau of Mineral Resources in 1959, though no gold or copper mineralization was identified. In 1971, Day Dawn Minerals NL conducted regional sampling, detecting anomalous copper and gold at Main Dome. From 1972 to 1975, Newmont Pty Ltd carried out extensive exploration and drilling, defining an open pit reserve primarily in the Middle Vale Reef. In 1975, BHP Gold acquired a 30% stake due to foreign ownership regulations, and in 1990, Newmont and BHP Gold merged their Australian assets to form Newcrest Mining Limited. Newcrest led significant exploration and resource drilling for over 30 years until its acquisition by Newmont Corp on November 6, 2023. Newmont subsequently divested Telfer and sold to Greatland Gold on the 4th December 2024. |
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Geology |
Telfer is located within the northwestern Paterson Orogen and is hosted by the Yeneena Supergroup, a 9 km thick sequence of marine sedimentary rocks. Gold and copper mineralization occurs in stratiform reefs and stockworks within the Malu Formation of the Lamil Group, controlled by both structure and lithology. Mineralization styles include high-grade narrow reefs, reef stockwork corridors, sheeted vein sets, and extensive low-grade stockwork, which forms most of the sulphide resource. Sulphide mineralization consists mainly of pyrite and chalcopyrite, with copper minerals including chalcopyrite, chalcocite, and bornite. Gold is primarily free-grained or associated with sulphides and quartz/dolomite gangue, with a correlation between vein density and gold grade. The highest gold and copper grades occur within bedding sub-parallel reef systems, including multiple reef structures in Main Dome, such as E-Reefs, MVR, M10-M70 reefs, A-Reef, and B-Reefs (notably B30). Additional mineralization occurs in northwest-trending and north-dipping veins. Stockwork mineralization, found in open pits, Telfer Deeps, and the Vertical Stockwork Corridor (VSC), is best developed in the axial zones of Main Dome and West Dome, often extending over large areas (0.1 km to 1.5 km). It can include brecciated zones filled with quartz, carbonate, and sulphides
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Drill hole Information |
As provided in table 1 of this announcement. |
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Data aggregation methods |
Significant assay intercepts are reported as (A) length-weighted averages, Intercepts are calculated using a minimum threshold of 0.5 g/t Au, allowing for up to 5m of internal dilution. Only intercepts exceeding 5 gold gram metres are reported. |
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Relationship between mineralisation widths and intercept lengths |
Significant assay intervals reported represent apparent widths. Drilling is not always perpendicular to the dip of mineralisation and true widths are less than downhole widths. Estimates of true widths will only be possible when all results are received, and final geological interpretations have been completed. |
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Diagrams |
As provided. |
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Balanced reporting |
Earlier results of exploration programmes conducted by Newcrest, Newmont and Greatland Gold have previously been reported. Further drilling at telfer is continuing with material results to be reported in subsequent announcements. |
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Other substantive exploration data |
Nil |
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Further work |
Further work is planned to evaluate exploration opportunities that extend the known mineralisation and to improve confidence of the model. |
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