20 September 2017
NICKEL SULPHIDE EXPLORATION AT WINDSOR HIGHLIGHTS:-
High powered SAMSON EM survey at Windsor planned for later this month
+200,000 Siemens EM conductor will be prioritised for further drilling once SAMSON EM survey results are reviewed
- Very thick high-MgO ultramafic channel confirmed by previous drilling at Windsor including a 215m thick intersection of high-MgO ultramafic in drill hole WINRC016
- Magmatic nickel sulphide mineralisation identified in numerous drill holes including DRAC38 which intersected 30m @ 0.31%Ni from 108m, including 8m @ 0.44%Ni from 130m and 2m @ 0.62%Ni from 132m
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Basal contact of the ultramafic channel is largely unexplored and remains a priority target for massive nickel sulphide mineralisation
NICKEL SULPHIDE EXPLORATION AT WINDSOR
St George Mining Limited (ASX: SGQ) ('St George Mining' or 'the Company') is pleased to announce the upcoming exploration programme for the Windsor nickel sulphide prospect at its 100% owned East Laverton Project in Western Australia.
Drilling at the Windsor nickel sulphide prospect earlier this year focused on testing near surface EM (electromagnetic) conductors. Drill targets included EM plates modelled with a very high conductivity of
+200,000 Siemens.
These strong conductors are located within a thick ultramafic channel where drilling has already intersected high-MgO ultramafics and magmatic nickel sulphide mineralisation, indicating that the channel is a highly prospective setting for massive nickel sulphides.
A SAMSON EM survey is scheduled to commence at Windsor later this month. The SAMSON EM crew are currently at our Mt Alexander Project, and will mobilise to Windsor once the EM survey over the western extension of the Cathedrals Belt is completed.
The high powered SAMSON EM survey will search for deep conductors at the basal contact of the Windsor channel and will also provide additional EM data to further model the shallow EM targets at Windsor. A follow-up diamond drill programme will be scheduled for Windsor once survey results are reviewed and modelling of EM targets is completed.
St George Mining Executive Chairman, John Prineas said:"The identification of widespread magmatic nickel sulphides within the high-MgO Windsor ultramafic - together with multiple and still unexplained strong EM conductors - supports the prospectivity of the channel for massive nickel sulphide mineralisation.
"We are excited at this next phase of exploration at Windsor."
Figure 1 shows the area of the Windsor ultramafic channel that will initially be covered by the SAMSON EM survey, with additional EM loops to be planned on review of survey results. This initial survey area includes drill hole DRAC38, the discovery hole at Windsor which intersected 30m @ 0.31%Ni, including 6m
@ 0.48%Ni and 2m @ 0.62%Ni. DRAC38 was drilled by BHP in 2012.A petrographic examination of the nickel sulphides in DRAC38 confirmed that they were high tenor magmatic sulphides dominated by pentlandite.
Follow-up drilling in this area by St George continued to intersect very thick high-MgO ultramafic with widespread nickel sulphide mineralisation (see Table 1), including the following intersections:
WINRC004 - 89m @ 0.20%Ni from 52m including 2m @ 0.39%Ni from 122m
WINRC005 - 147m @ 0.25%Ni from 125m including 7m @ 0.34%Ni from 161m and 1m @ 0.40%Ni from 292m
WINRC007 - 47m @ 0.29%Ni from 242m including 1m @ 0.75%Ni from 286m
WINRC016 intersected a very thick high-MgO ultramafic with a 215m downhole intersection from 58m to 273m. Although significant nickel sulphides were not identified in WINRC016, it was the downhole EM (DHEM) survey in this drill hole that first detected the +200,000 Siemens EM conductor.
Figure 1 - the section of the Windsor ultramafic channel to be covered by the SAMSON EM survey.
Additional EM loops will be planned on review of survey results.
DHEM surveys in adjacent drill holes have also identified strong EM anomalies within the top 100m of the Windsor ultramafic. These conductors may be steeply dipping shoots associated with a larger accumulation of nickel sulphides at depth.
The SAMSON EM survey uses a high powered transmitter that has the capability to deliver greater EM depth penetration than can be achieved by conventional EM systems, and will more effectively search the basal contact at Windsor.
HOLE ID | EASTING (m) | NORTHING (m) | DIP (deg) | AZM (deg) | DEPTH (m) | FROM (m) | TO (m) | WIDTH (m) | Ni (%) |
WINRC004 | 530710 | 6733650 | -60 | 60 | 264 | 60 | 145 | 85 | 0.21 |
Incl. | 88 | 91 | 3 | 0.33 | |||||
Incl. | 122 | 124 | 2 | 0.37 | |||||
WINRC005 | 530635 | 6733605 | -60 | 60 | 300 | 126 | 270 | 144 | 0.26 |
Incl. | 161 | 163 | 2 | 0.39 | |||||
Incl. | 165 | 168 | 3 | 0.36 | |||||
Incl. | 181 | 186 | 5 | 0.32 | |||||
Incl. | 197 | 201 | 4 | 0.32 | |||||
Incl. | 204 | 207 | 3 | 0.32 | |||||
Incl. | 260 | 263 | 3 | 0.33 | |||||
and | 279 | 297 | 18 | 0.20 | |||||
Incl. | 292 | 293 | 1 | 0.40 | |||||
WINRC006 | 530588 | 6733577 | -60 | 60 | 336 | 267 | 336 | 69 | 0.22 |
WINRC007 | 530650 | 6733500 | -60 | 60 | 380 | 177 | 198 | 21 | 0.27 |
Incl. | 180 | 181 | 1 | 0.36 | |||||
and | 214 | 224 | 10 | 0.21 | |||||
and | 227 | 302 | 75 | 0.24 | |||||
Incl. | 247 | 248 | 1 | 0.3 | |||||
Incl. | 280 | 284 | 4 | 0.41 | |||||
Incl. | 286 | 288 | 2 | 0.58 | |||||
Incl. | 286 | 287 | 1 | 0.75 | |||||
Incl. | 290 | 291 | 1 | 0.30 | |||||
and | 352 | 356 | 4 | 0.23 | |||||
WINRC008 | 530727 | 6733550 | -60 | 60 | 300 | 60 | 235 | 175 | 0.22 |
Incl. | 177 | 178 | 1 | 0.31 | |||||
Incl. | 180 | 182 | 2 | 0.31 | |||||
WINRC009 | 530740 | 6733432 | -60 | 60 | 300 | 55 | 101 | 46 | 0.23 |
and | 131 | 136 | 5 | 0.21 | |||||
and | 172 | 263 | 91 | 0.24 | |||||
Incl. | 201 | 202 | 1 | 0.39 | |||||
Incl. | 206 | 207 | 1 | 0.31 | |||||
Incl. | 227 | 229 | 2 | 0.31 | |||||
Incl. | 233 | 234 | 1 | 0.3 | |||||
Incl. | 247 | 249 | 2 | 0.31 | |||||
DRAC38 | 530786 | 6733696 | -60 | 250 | 298 | 108 | 138 | 30 | 0.31 |
Incl. | 132 | 134 | 2 | 0.62 | |||||
and | 152 | 164 | 12 | 0.26 | |||||
and | 172 | 180 | 8 | 0.26 | |||||
and | 186 | 190 | 4 | 0.26 | |||||
and | 194 | 196 | 2 | 0.25 | |||||
and | 204 | 208 | 4 | 0.27 |
Table 1 - Details of nickel intersected within the survey area. Cut-off grade of 0.20%Ni is used to illustrate high-MgO ultramafic. Mineralised nickel sulphide intercepts are >0.3% Ni and highlighted in yellow.
Figure 2 shows the location of the area to be surveyed along the Stella Range belt. Importantly, this area is within the intersection of the N-NW Stella Range belt and the E-NE transform fault known as the Churchill lineament. The intersection of these structures may be a control on the mineralisation at Windsor with potential for any significant deposits to be located proximal to the intersection.
Figure 2 - map of the Windsor nickel sulphide prospect (against RTP magnetics) within the tenement package of the East Laverton Project. The area to be surveyed by SAMSON EM is highlighted.
St George Mining Limited published this content on 20 September 2017 and is solely responsible for the information contained herein.
Distributed by Public, unedited and unaltered, on 19 September 2017 23:49:08 UTC.
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