Jervois 2021 Exploration Program & Results
only | ||
1 March 2022 | ||
∙ | Significant Induced Polarisation-Resistivity (IP) survey carried out over the J-Fold at | |
Jervois; | ||
use | ∙ | 10 holes drilled to test identified IP anomalies and provide basis for downhole |
electromagnetic (DHEM) surveys; | ||
∙ | DHEM surveys carried out in 16 holes; | |
∙ | Cox's South discovery identified though IP, with a chalcopyrite-bornite-bearing | |
mineralised zone encountered in drilling KJCD482: | ||
personal | 2.53m (Estimated True Width) @ 1.92% Cu and 14.7 g/t Ag from 523m | |
∙ | Subsequent DHEM from KJCD482 identified an associated large, low-conductance | |
program, and additional targets that required follow up drilling. All the hole locations and prospect names | ||
target; | ||
∙ | Geophysical methodology continues to be refined; | |
∙ | Several highly prospective exploration targets identified for follow up. | |
Summary | ||
The exploration program at Jervois was carried out in three defined phases: | ||
1. | IP Program | |
From June to September 2021 KGL undertook a large MIMDAS1 Induced polarisation-resistivity (IP) | ||
survey, aimed at filling in gaps and improving data over the predominant geological feature at Jervois - the | ||
J-Fold. Figure 1 below shows the IP Survey layout over the J Fold. | ||
2. | Exploration Drilling | |
During 2021 10 holes were drilled, totalling 4,769.1metres, to test anomalies identified during the 2021 IP | ||
For | are displayed on Figure 3 below. | |
3. | Downhole Electromagnetics (DHEM) Surveys | |
A total of 16 holes were surveyed utilising holes drilled in 2021, and previously where access was available. This program included 2 surveys at Rockface after encountering the massive sulphides in the Rockface North lens at depth.
This staged methodology has been used previously at Jervois, most notably in the exploration and definition of the Rockface deposit. Each deposit so far discovered displays differing responses to the various geophysical techniques and needs continual review and remodelling to identify locations for targeted drilling.
1 MIMDAS = MIM Distributed Acquisition System, which is an IP-Resitivity-Magnetotelluricssystem developed by Mount Isa Mines during the late 1990s and now operated by contractors GRS Pty Ltd
KGL Resources Limited | Exploration Results | Page 1 of 14 |
Jervois 2021 Exploration Program & Results
For personal use only
2021 IP Survey design and execution
In 2021 KGL undertook a MIMDAS IP survey consisting of 15.5km of true 3D IP and 64.2 km of 2D IP (Figure 1). The new survey covered 9 km of strike-length of the highly prospective Jervois J-fold which is a mega-structure hosting the Company's 3 principle mineral resources; Reward, Bellbird and Rockface, as well as numerous prospects, some of which are named in Figure 1.
The true 3D IP was designed to cover a highly prospective segment of the J-fold between the Rockface deposit and Cox's Find prospect, which is a substantial surface copper outcrop which had been drilled to shallow depth. North of Cox's Find, 8 lines of 2D were oriented NW-SE and covered ground previously not surveyed by modern IP. North of these lines the 2021 IP lines mostly interleaved with the earlier 2001 MIMDAS IP survey which refined the line spacing to approximately 200m, as well as some additional coverage to the east and west. This closer line spacing provided for more effective and accurate 3D inversion modelling of the IP data.
The choice of the MIMDAS method was based on a 2020 review of the historical geophysical data around Jervois. This highlighted that the Rockface Main lens, Bellbird lenses, Reward and Cox's deposits all produce strong chargeability anomalies. The absence of significant conductive overburden at Jervois enables MIMDAS a reach a deeper limit of investigation than is often available on other projects in Australia, and is used to define broad targets for further investigation.
Figure 1: Jervois Project IP survey layout. Magenta: 2021 3D MIMDAS IP, Red: 2021 2D MIMDAS IP, Blue: 2001 2D MIMDAS IP, Yellow dots 2014 Orion 3D IP.
Results of MIMDAS IP Survey
Figure 2 shows a depth slice at 250m below surface of the IP chargeability model. The model incorporates the historical MIMDAS data from 2001 and the new data from 2021. Also displayed is the same depth slice through the Orion model from 2014. The combined surveys now adequately cover 11km of strike length of the Jervois J-fold.
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Jervois 2021 Exploration Program & Results
For personal use only
The IP modelling and interpretation define strong anomalies coincident with the known deposits of Reward, Rockface and Bellbird. Several other significant IP anomalies are evident, which were un-tested, or inadequately tested, by drilling. These anomalies include Cox's Find South, Reward North/Becana/Pioneer, Reward South, and Bellbird South.
Figure 2: IP Chargeability depth slice at 100m RL (approximately 250m below surface). Warmer colours indicate higher chargeability
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Jervois 2021 Exploration Program & Results
2021 Exploration Drilling Program
only | During 2021 10 exploration holes were drilled (see Figure 3): | |||||||||||||||||||||
∙ | Bellbird South - 4 holes | |||||||||||||||||||||
use | ∙ | Cox's Find vicinity - 4 holes | ||||||||||||||||||||
∙ | Reward South - 1 hole | |||||||||||||||||||||
∙ | Rocky Road - 1 hole | |||||||||||||||||||||
The following table lists exploration holes completed during the 2021 drilling program including the most | ||||||||||||||||||||||
significant assay results. The collar positions of the holes are shown in Figure 3. All holes listed were | ||||||||||||||||||||||
surveyed using DHEM. | ||||||||||||||||||||||
personal | Prospect | Hole ID | Depth (m) | Copper Intersections | ||||||||||||||||||
97.0 | 98.0 | 1.0 | 0.59 | |||||||||||||||||||
From (m) | To (m) | Drilled Width (m) | Cu (%) | |||||||||||||||||||
Reward South | KJCD423X | 429.7 | 395.0 | 397.0 | 2.0 | 1.45 | ||||||||||||||||
Bellbird South | KJD443 | 351.9 | 114.2 | 115.7 | 1.5 | 0.56 | ||||||||||||||||
Bellbird South | KJD445 | 360.7 | No significant intersection | |||||||||||||||||||
Cox's Find | *KJC461 | 310.0 | 234.0 | 235.0 | 1.0 | 1.54 | ||||||||||||||||
167.0 | 168.0 | 1.0 | 1.05 | |||||||||||||||||||
Cox's Find | *KJC462 | 328.0 | 260.0 | 262.0 | 2.0 | 1.62 | ||||||||||||||||
264.0 | 265.0 | 1.0 | 1.25 | |||||||||||||||||||
Cox's Find South | *KJCD482 | 784.2 | 523.0 | 526.0 | 3.0 | 1.92 | ||||||||||||||||
Cox's Find AZ | *KJCD483 | 691.2 | 234.1 | 235.3 | 1.1 | 2.53 | ||||||||||||||||
For | Bellbird South | KJCD484 | 490.2 | |||||||||||||||||||
254.8 | 255.5 | 0.7 | 1.44 | |||||||||||||||||||
Rocky Road | KJCD485 | 568.2 | No significant intersection | |||||||||||||||||||
Bellbird South | KJD486 | 455.0 | 140.6 | 141.6 | 1.0 | 0.56 | ||||||||||||||||
345.0 | 346.0 | 1.0 | 1.56 | |||||||||||||||||||
Table 1 Exploration holes and significant copper intersections for 2021 drilling program. (* results previously reported)
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Jervois 2021 Exploration Program & Results
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Downhole EM
A DHEM program was also completed during the latter part of 2021. A total of 16 holes were surveyed (Table 2). Significant DHEM conductors having known association with copper mineralisation, were detected at Cox's Find South IP anomaly, Rockface and Reward South Silver prospect.
personal use
Prospect Name
Reward South Silver
Cox's Find
Cox's South IP anomaly
Cox's Find AZ IP anomaly
Rockface
Rocky Road
Bellbird
Bellbird South
Holes Surveyed by DHEM
KJCD422*
KJCD423X*
KJCD424*
KJC461
KJC462
KJCD482*
KJCD483
KJCD481D3*
KJCD481D4*
KJCD485**
KJCD479
KJCD480
KJD443
KJD445
KJCD484
KJCD486
For
Table 2: List of holes surveyed by DHEM during 2021. *Significant DHEM conductors. **Detected Rockface conductors
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KGL Resources Limited published this content on 28 February 2022 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 01 March 2022 00:40:37 UTC.