GoldMining Discovers Gold and Copper Mineralization in Drilling 1 km from the São Jorge Deposit, Brazil
Designated News Release
Highlights include:
- The two most recent diamond drill holes successfully identified new gold and copper mineralization approximately 1 kilometre ("km") northwest of the São Jorge gold deposit (the "Deposit") in areas that had no previous drilling. Assay results include:
- Drill hole SJD-123-24:
- 10 m at 0.66 grams per tonne (g/t) gold (Au) from 93 metres (m) depth, including:
- 2 m at 1.65 g/t Au from 93 m depth.
- 10 m at 0.66 grams per tonne (g/t) gold (Au) from 93 metres (m) depth, including:
- Drill hole SJD-124-24:
- 28 m at 275 ppm (0.0275%) copper (Cu) from 28 m depth.
- Drill hole SJD-123-24:
- The ongoing shallow auger drilling program has returned very encouraging indications of new zones of primary gold mineralization at the William South target located approximately 2 km north of the Deposit. Several auger drill holes delivered high-grade intercepts within the top of weathered bedrock, directly underlying large high-tenor surface soil anomalies. Highlight drill intercepts include:
- 1 m at 17.14 g/t Au from 12 m depth
- 1 m at 8.01 g/t Au from 6 m depth
- 1 m at 3.78 g/t Au from 10 m depth
Alastair Still, Chief Executive Officer of GoldMining, commented: "The exploration program at São Jorge completed to date has significantly advanced our geological knowledge in the São Jorge district, including better defining the high-grade core of the São Jorge deposit. The recent step-out core drilling program has identified mineralization approximately 1 km away from the existing mineral resource in an area with no previous drilling. In addition, our team has assembled exciting evidence for potential additional corridors of mineralization on the regional scale property, which were diligently identified via gold-in-soil sampling and now have been confirmed through auger drilling to include a bedrock source containing high-grade gold."
São Jorge Drill Program Overview
The Company commenced drilling at São Jorge in
The diamond core drilling component of the program consisted of 1,077 m over five holes, and the ongoing 3,000 m auger drilling program is approximately two thirds complete, with assays received from approximately one third of the projected program. Assay results for the latest two diamond drill holes (SJD-123-24 and SJD-124-24) have been received, which combined with the previously released holes, SJD-120-24 to SJD-122-24 (see news releases dated
Ongoing auger drilling, focused in an area located approximately 2 km north of the São Jorge deposit to follow up on the large high tenor 'William South' gold-in-soil anomaly, has returned very encouraging indications of primary gold mineralization in bedrock which highlights that the large, regional-scale property has potential to host additional corridors of mineralization that can be further tested by core drilling.
São Jorge lies within the active and rapidly developing Tapajós
São Jorge is located immediately adjacent to paved Hwy BR-163 and a new 138 kV powerline corridor, which ties into the district electrical grid recently constructed for the
Diamond Core Drilling Program
Highlights of the confirmatory component of the drilling program included drill holes SJD-120-24 (see news release dated
SJD-123-24 and SJD-124-24 – new drilling reported in this release - comprised step-out drilling located approximately 1 km to the northwest of the Deposit, testing coincident geochemical and geophysical anomalies interpreted to form an extension of the São Jorge high-strain corridor (see Figure 2). SJD-123-24 and SJD-124-24 tested strong and broad gold- and copper-in-soil surface anomalies, respectively. See Tables 1 and 2 for further information regarding the diamond core drilling.
Gold mineralization encountered in SJD-123-24 is similar in style to that in the São Jorge deposit, comprising fracture-controlled sulphide ± quartz veins, with the sulphides consisting of dominant pyrite with lesser chalcopyrite. This helps support our geological model that gold mineralization may extend along a broad high-strain corridor co-incident locally with a contact between monzogranite and syenogranite The sheared contact between monzogranite and syenogranite, which at the Deposit forms the southern boundary of the São Jorge high-strain corridor, was not intersected in the shallow depth drilled in SJD-123-24, thus follow-up drilling is warranted both across and along strike (see Figure 3 for a cross-section of SJD-123-24 and SJD-124-24).
The elevated copper encountered in SJD-124-24 is interpreted as a possible hydromorphic dispersion layer in saprolite, see Figure 3, formed from the in situ weathering of granitoid rock and the redistribution of mobile metals by ground water. It may form a horizontal blanket-shaped plume of elevated copper, concentrated between the base of complete oxidation ("BOCO") and top of fresh rock ("TOFR"), which is the typical location for hydromorphic mobilization of soluble metals in a lateritic weathering profile such as in the Tapajós district of the Brazilian Craton. The strongly anomalous Cu zone in SJD-124-24 contains approximately 20 times the typical background of copper levels normally found in granitoid rocks, and the location, continuity and tenor of the anomalous copper values may indicate an underlying bedrock source of copper mineralization in close proximity. Deeper sections of SJD-124-24 intersected thin discrete sulphide bearing veins with dominant pyrite and chalcopyrite, thus confirming a possible source of the elevated copper in bedrock. Hydromorphic dispersion halos may extend for 10s to 100s of meters from the source bedrock mineralization, therefore follow-up drilling is warranted to further explore and confirm the potential source, tenor and style of copper mineralization responsible for the broad halo of copper enrichment in the weathering profile.
Auger Geochemical Drilling Program
A power auger drilling program comprising an initial program of 3,000 meters for approximately 200 holes is underway at the Project. The auger program is initially targeting the high priority 'William South' area located approximately 2 km north of the São Jorge deposit. William South comprises a broad high-tenor zone of anomalous gold-in-soil (see Figures 2 and 4), measuring approximately 2 km x 2 km with soil assays peaking at 2,163 ppb Au (2.163 g/t Au).
To date assays have been received for 101 holes completed at the William South target. From the initial drill results, approximately 25% of all holes have returned assay results greater than 100 ppb (0.1 g/t) Au, confirming the presence of gold mineralization in weathered bedrock. Note that background gold values in both residual weathered bedrock and overlying transported soils, is expected to range from nil to 1-2 ppb Au, thus values of greater than 10 -25 ppb Au are considered to be 'elevated' and greater than 100 ppb Au to be 'highly anomalous'.
The auger drilling comprises a powered 20 centimetre diameter rotary drill head capable of penetrating to 15-20 m depth. A geologist or technician supervises the drilling to log the drill cuttings and distinguish transported overburden from in situ weathered bedrock. Sampling is conducted on 1 m intervals with assaying to 5 ppb Au detection. The drill method is open-hole, therefore contamination and/or dilution of precious metal grades by material from higher in the hole is possible. However, the low detection limit assay results, coupled with interpretation of the geological profile, provides a quick, cheap and effective direct mapping of the presence of gold mineralization in the uppermost portion of the residual weathered bedrock profile. This information can be used to guide follow-up exploration drilling using larger equipment such as reverse circulation (RC) or diamond core drilling. The auger drilling assay results received to date are illustrated in Figure 2, and details are provided in Tables 3 & 4.
Auger drilling at William South has to date returned very encouraging indications of primary gold mineralization in bedrock, which confirms an in situ source of the gold-in-soil anomaly and encourages more widespread application of auger drilling – a cheap and rapid sub-surface geochemical test – across other gold-in-soil anomalies within the Project. Furthermore, the confirmation of a bedrock gold source beneath the William South soil anomaly suggests that the large, regional-scale Project has potential to host additional corridors of mineralization that can be further tested by deeper RC or core drilling methods to define new bedrock gold discoveries. Several additional target areas are planned for auger drill testing over the coming months, see Figure 4.
For additional information regarding the São
Table 1 – São Jorge assay intercepts from the 2024 diamond core drilling program, received as of
Hole Number |
Interval From (m) |
Interval To (m) |
Core Length 1 (m) |
(g/t) |
Cu Grade (ppm) |
SJD-120-24 |
44.00 |
207.00 |
163.00 |
1.02 |
- |
SJD-120-24 |
44.00 |
64.00 |
20.00 |
1.37 |
- |
Including |
45.00 |
50.00 |
5.00 |
2.82 |
- |
Including |
45.00 |
46.00 |
1.00 |
7.25 |
- |
SJD-120-24 |
69.00 |
70.00 |
1.00 |
3.03 |
- |
SJD-120-24 |
74.00 |
75.00 |
1.00 |
5.05 |
- |
SJD-120-24 |
95.00 |
132.00 |
37.00 |
2.26 |
- |
Including |
97.00 |
98.00 |
1.00 |
11.47 |
- |
Including |
102.00 |
104.00 |
2.00 |
12.22 |
- |
SJD-120-24 |
148.00 |
159.00 |
11.00 |
1.00 |
- |
Including |
152.00 |
155.00 |
3.00 |
2.31 |
- |
SJD-120-24 |
166.00 |
179.00 |
13.00 |
1.35 |
- |
SJD-120-24 |
195.0 |
207.0 |
12.00 |
1.15 |
- |
including |
201.00 |
206.00 |
5.00 |
2.24 |
- |
Including |
205.00 |
206.00 |
1.00 |
7.29 |
- |
SJD-120-24 |
249.00 |
250.00 |
1.00 |
1.07 |
- |
SJD-120-24 |
259.00 |
260.00 |
1.00 |
1.27 |
- |
SJD-120-24 |
265.00 |
266.00 |
1.00 |
3.74 |
- |
SJD-121-24 |
49.00 |
52.00 |
3.00 |
1.31 |
- |
SJD-121-24 |
86.00 |
104.00 |
18.00 |
0.70 |
- |
Including |
88.00 |
96.00 |
8.00 |
1.14 |
- |
SJD-121-24 |
191.00 |
196.00 |
5.00 |
0.75 |
- |
SJD-122-24 |
32.00 |
35.00 |
3.00 |
0.80 |
- |
SJD-122-24 |
61.00 |
80.00 |
19.00 |
1.24 |
- |
Including |
68.00 |
75.00 |
7.00 |
2.98 |
- |
Including |
72.00 |
73.00 |
1.00 |
15.67 |
- |
SJD-122-24 |
110.00 |
114.00 |
4.00 |
0.47 |
- |
SJD-123-24 |
93.00 |
103.00 |
10.00 |
0.66 |
- |
Including |
93.00 |
95.00 |
2.00 |
1.65 |
- |
SJD-124-24 |
28.00 |
56.00 |
28.00 |
- |
275 |
Notes: |
|
|
|
1. |
True widths are estimated to be approximately 66% of downhole length, assuming primarily steeply dipping vein-hosted mineralization. |
Table 2 – São Jorge 2024 diamond core drill hole collar location coordinates.
Hole Number |
Easting Metres (UTM Zone 21S) |
Northing Metres (UTM Zone 21S) |
Elevation (m above sea level) |
Depth (m) |
Azimuth ( Degrees ) |
Dip ( Degrees ) |
Status |
SJD 120-24 |
657535 |
9282655 |
209.45 |
271.84 |
335 |
-50 |
All assays received |
SJD 121-24 |
656807 |
9283159 |
211.50 |
200.34 |
180 |
-50 |
All assays received |
SJD 122-24 |
656810 |
9283020 |
214.90 |
126.43 |
180 |
-50 |
All assays received |
SJD 123-24 |
656065 |
9283800 |
203.10 |
251.39 |
230 |
-50 |
All assays received |
SJD 124-24 |
656360 |
9284004 |
223.29 |
226.51 |
215 |
-50 |
All assays received |
Table 3 – São Jorge bedrock assay intercepts from the 2024 auger drilling program, received as of September 9, 2024
Hole Number |
Interval From (m) |
Interval To (m) |
Sample Length1 (m) |
Au Grade (g/t) |
SJTRD-047-24 to SJTRD-053-24 |
No Significant Result |
|||
SJTRD-054-24 |
9.00 |
10.00 |
1.00 |
0.22 |
SJTRD-055-24 |
10.00 |
11.00 |
1.00 |
0.96 |
SJTRD-056-24 to SJTRD-076-24 |
No Significant Result |
|||
SJTRD-077-24 |
7.00 |
9.00 |
1.00 |
3.05 |
SJTRD-078-24 |
No Significant Result |
|||
SJTRD-079-24 |
4.00 |
5.00 |
1.00 |
0.12 |
SJTRD-080-24 |
5.00 |
6.00 |
1.00 |
0.18 |
SJTRD-081-24 |
4.00 |
5.00 |
1.00 |
0.32 |
SJTRD-082-24 |
8.00 |
9.00 |
1.00 |
2.03 |
And |
12.00 |
13.00 |
1.00 |
17.14 |
SJTRD-083-24 |
No Significant Result |
|||
SJTRD-084-24 |
17.00 |
18.00 |
1.00 |
0.92 |
SJTRD-085-24 |
No Significant Result |
|||
SJTRD-086-24 |
6.00 |
7.00 |
1.00 |
8.01 |
SJTRD-087-24 to SJTRD-089-24 |
No Significant Result |
|||
SJTRD-090-24 |
9.00 |
10.00 |
1.00 |
0.83 |
SJTRD-091-24 |
9.00 |
11.00 |
2.00 |
1.47 |
SJTRD-092-24 to SJTRD-095-24 |
No Significant Result |
|||
SJTRD-096-24 |
6.00 |
7.00 |
1.00 |
0.28 |
SJTRD-097-24 |
No Significant Result |
|||
SJTRD-098-24 |
6.00 |
8.00 |
2.00 |
0.38 |
SJTRD-099-24 to SJTRD-107-24 |
No Significant Result |
|||
SJTRD-108-24 |
10.00 |
11.00 |
1.00 |
0.10 |
SJTRD-109-24 |
9.00 |
10.00 |
1.00 |
0.11 |
SJTRD-110-24 |
7.00 |
8.00 |
1.00 |
0.21 |
SJTRD-111-24 |
No Significant Result |
|||
SJTRD-112-24 |
5.00 |
6.00 |
1.00 |
0.19 |
SJTRD-113-24 |
10.00 |
11.00 |
1.00 |
0.17 |
SJTRD-114-24 to SJTRD-120-24 |
No Significant Result |
|||
SJTRD-121-24 |
8.00 |
9.00 |
1.00 |
0.11 |
SJTRD-122-24 to SJTRD-123-24 |
No Significant Result |
|||
SJTRD-124-24 |
9.00 |
11.00 |
2.00 |
2.06 |
Including |
10.00 |
11.00 |
1.00 |
3.78 |
SJTRD-125-24 to SJTRD-127-24 |
No Significant Result |
|||
SJTRD-128-24 |
13.00 |
14.00 |
1.00 |
0.78 |
SJTRD-129-24 to SJTRD-142-24 |
No Significant Result |
Notes: |
|
|
|
1. |
True widths are unknown given the vertical hole angle and limited depth of drill penetration. |
Table 4 – São Jorge 2024 auger drill hole collar location coordinates.1
Hole Number |
Easting Metres (UTM Zone 21S) |
Northing Metres (UTM Zone 21S) |
Elevation (m above sea level) |
Depth (m) |
Status |
SJTRD-047-24 |
656598 |
9284613 |
210 |
20 |
All assays received |
SJTRD-048-24 |
656712 |
9284447 |
211 |
15 |
All assays received |
SJTRD-049-24 |
656709 |
9284505 |
214 |
14 |
All assays received |
SJTRD-052-24 |
656701 |
9284550 |
215 |
14 |
All assays received |
SJTRD-051-24 |
656651 |
9284700 |
215 |
8 |
All assays received |
SJTRD-050-24 |
656650 |
9284650 |
219 |
11 |
All assays received |
SJTRD-055-24 |
656650 |
9284600 |
218 |
13 |
All assays received |
SJTRD-054-24 |
656601 |
9284600 |
217 |
12 |
All assays received |
SJTRD-053-24 |
656601 |
9284650 |
221 |
10 |
All assays received |
SJTRD-056-24 |
656603 |
9284701 |
215 |
7 |
All assays received |
SJTRD-057-24 |
656401 |
9284500 |
219 |
14 |
All assays received |
SJTRD-058-24 |
656402 |
9284550 |
222 |
12 |
All assays received |
SJTRD-059-24 |
656402 |
9284600 |
223 |
11 |
All assays received |
SJTRD-060-24 |
656401 |
9284635 |
219 |
10 |
All assays received |
SJTRD-061-24 |
656350 |
9284600 |
218 |
9 |
All assays received |
SJTRD-062-24 |
656351 |
9284550 |
220 |
13 |
All assays received |
SJTRD-063-24 |
656357 |
9284500 |
207 |
14 |
All assays received |
SJTRD-064-24 |
656361 |
9284445 |
225 |
13 |
All assays received |
SJTRD-065-24 |
656602 |
9284559 |
216 |
14 |
All assays received |
SJTRD-066-24 |
656603 |
9284568 |
226 |
13 |
All assays received |
SJTRD-067-24 |
656603 |
9284578 |
201 |
14 |
All assays received |
SJTRD-068-24 |
656604 |
9284588 |
209 |
13 |
All assays received |
SJTRD-069-24 |
656607 |
9284598 |
230 |
14 |
All assays received |
SJTRD-070-24 |
656618 |
9284600 |
203 |
12 |
All assays received |
SJTRD-071-24 |
656599 |
9284624 |
205 |
16 |
All assays received |
SJTRD-072-24 |
656598 |
9284631 |
207 |
18 |
All assays received |
SJTRD-073-24 |
656595 |
9284643 |
206 |
18 |
All assays received |
SJTRD-074-24 |
656596 |
9284660 |
206 |
16 |
All assays received |
SJTRD-075-24 |
656596 |
9284676 |
204 |
18 |
All assays received |
SJTRD-076-24 |
656599 |
9284652 |
205 |
18 |
All assays received |
SJTRD-077-24 |
656801 |
9284637 |
212 |
15 |
All assays received |
SJTRD-078-24 |
656558 |
9284652 |
205 |
18 |
All assays received |
SJTRD-079-24 |
656567 |
9284653 |
206 |
18 |
All assays received |
SJTRD-080-24 |
656578 |
9284653 |
205 |
18 |
All assays received |
SJTRD-081-24 |
656588 |
9284649 |
205 |
18 |
All assays received |
SJTRD-082-24 |
656604 |
9284655 |
221 |
16 |
All assays received |
SJTRD-083-24 |
656614 |
9284655 |
221 |
18 |
All assays received |
SJTRD-084-24 |
656624 |
9284654 |
221 |
18 |
All assays received |
SJTRD-085-24 |
656634 |
9284654 |
220 |
18 |
All assays received |
SJTRD-086-24 |
656648 |
9284654 |
220 |
18 |
All assays received |
SJTRD-087-24 |
656645 |
9284625 |
209 |
15 |
All assays received |
SJTRD-088-24 |
656625 |
9284600 |
208 |
15 |
All assays received |
SJTRD-089-24 |
656634 |
9284599 |
208 |
15 |
All assays received |
SJTRD-090-24 |
656588 |
9284596 |
211 |
15 |
All assays received |
SJTRD-091-24 |
656577 |
9284597 |
212 |
15 |
All assays received |
SJTRD-092-24 |
656568 |
9284602 |
223 |
15 |
All assays received |
SJTRD-093-24 |
656556 |
9284597 |
209 |
15 |
All assays received |
SJTRD-094-24 |
656711 |
9284454 |
218 |
15 |
All assays received |
SJTRD-095-24 |
656733 |
9284452 |
219 |
15 |
All assays received |
SJTRD-096-24 |
656772 |
9284449 |
220 |
15 |
All assays received |
SJTRD-097-24 |
656797 |
9284441 |
214 |
15 |
All assays received |
SJTRD-098-24 |
656826 |
9284430 |
209 |
15 |
All assays received |
SJTRD-099-24 |
656744 |
9284621 |
196 |
15 |
All assays received |
SJTRD-100-24 |
656702 |
9284607 |
203 |
15 |
All assays received |
SJTRD-101-24 |
656506 |
9284656 |
209 |
15 |
All assays received |
SJTRD-102-24 |
656451 |
9284645 |
210 |
15 |
All assays received |
SJTRD-103-24 |
656452 |
9284600 |
212 |
15 |
All assays received |
SJTRD-104-24 |
656507 |
9284600 |
210 |
15 |
All assays received |
SJTRD-105-24 |
656553 |
9284579 |
236 |
15 |
All assays received |
SJTRD-106-24 |
656496 |
9284557 |
235 |
15 |
All assays received |
SJTRD-107-24 |
656451 |
9284545 |
223 |
15 |
All assays received |
SJTRD-108-24 |
656860 |
9284396 |
220 |
15 |
All assays received |
SJTRD-109-24 |
656849 |
9284447 |
211 |
15 |
All assays received |
SJTRD-110-24 |
656808 |
9284432 |
215 |
15 |
All assays received |
SJTRD-111-24 |
656798 |
9284438 |
218 |
15 |
All assays received |
SJTRD-112-24 |
656794 |
9284467 |
231 |
15 |
All assays received |
SJTRD-113-24 |
656777 |
9284434 |
212 |
15 |
All assays received |
SJTRD-114-24 |
656744 |
9284432 |
221 |
15 |
All assays received |
SJTRD-115-24 |
656757 |
9284469 |
219 |
15 |
All assays received |
SJTRD-116-24 |
656741 |
9284469 |
204 |
15 |
All assays received |
SJTRD-117-24 |
656727 |
9284431 |
218 |
15 |
All assays received |
SJTRD-118-24 |
656682 |
9284440 |
214 |
15 |
All assays received |
SJTRD-119-24 |
656689 |
9284464 |
213 |
15 |
All assays received |
SJTRD-120-24 |
656660 |
9284452 |
208 |
15 |
All assays received |
SJTRD-121-24 |
656664 |
9284475 |
206 |
15 |
All assays received |
SJTRD-122-24 |
656661 |
9284500 |
230 |
15 |
All assays received |
SJTRD-123-24 |
656665 |
9284541 |
206 |
15 |
All assays received |
SJTRD-124-24 |
656612 |
9284539 |
210 |
15 |
All assays received |
SJTRD-125-24 |
656606 |
9284501 |
213 |
15 |
All assays received |
SJTRD-126-24 |
656612 |
9284449 |
218 |
15 |
All assays received |
SJTRD-127-24 |
656609 |
9284401 |
227 |
15 |
All assays received |
SJTRD-128-24 |
656611 |
9284346 |
213 |
15 |
All assays received |
SJTRD-129-24 |
656606 |
9284296 |
219 |
15 |
All assays received |
SJTRD-130-24 |
656558 |
9284298 |
234 |
15 |
All assays received |
SJTRD-131-24 |
656510 |
9284301 |
229 |
15 |
All assays received |
SJTRD-132-24 |
656463 |
9284291 |
219 |
15 |
All assays received |
SJTRD-133-24 |
656406 |
9284297 |
223 |
15 |
All assays received |
SJTRD-134-24 |
656359 |
9284294 |
224 |
15 |
All assays received |
SJTRD-135-24 |
656311 |
9284297 |
215 |
15 |
All assays received |
SJTRD-136-24 |
656257 |
9284301 |
265 |
15 |
All assays received |
SJTRD-137-24 |
656214 |
9284291 |
216 |
15 |
All assays received |
SJTRD-138-24 |
656659 |
9284298 |
249 |
15 |
All assays received |
SJTRD-139-24 |
656754 |
9284300 |
220 |
15 |
All assays received |
SJTRD-140-24 |
656802 |
9284300 |
208 |
15 |
All assays received |
SJTRD-141-24 |
656835 |
9284295 |
194 |
15 |
All assays received |
SJTRD-142-24 |
656848 |
9284349 |
217 |
12 |
All assays received |
Notes: |
|
|
|
1. |
All holes are collared at a vertical hole angle. |
Qualified Person
Data Verification
For this drill core sampling program, samples were taken from the NQ/HQ core by sawing the drill core in half, with one-half sent to SGS Geosol Laboratórios Ltda. ("SGS") in
SGS is a certified commercial laboratory located in Vespasiano,
About
Notice to Readers
Technical disclosure regarding
São Jorge
has been prepared by the Company in accordance with NI 43-101. NI 43-101 is a rule of the Canadian Securities Administrators which establishes standards for all public disclosure an issuer makes of scientific and technical information concerning mineral projects. These standards differ from the requirements of the
Cautionary Statement on Forward-looking Statements
Certain of the information contained in this news release constitutes "forward-looking information" and "forward-looking statements" within the meaning of applicable Canadian and
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