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Auric Mining Limited (ASX: AWJ) (Auric or the Company) is pleased to announce that results have been returned for a small RC drilling program recently completed at the Fugitive Prospect, Spargoville Project, Western Australia.
HIGHLIGHTS
- Six-hole RC program completed at Fugitive Prospect.
- Scissor holes lead to geological reinterpretation.
- Results include 2m @ 3.82g/t Au, 3m @ 1.18g/t Au and 1m @ 6.08g/t Au within a broader mineralised zone.
- Mineralised zone represents highly prospective target for further drilling.
MANAGEMENT COMMENT
Mr. Mark English, Managing Director:
“The Fugitive Prospect is midway between two prominent, high-grade gold deposits; Wattle Dam and Spargos Reward at Spargoville. Our first-pass drilling has highlighted similarities with both deposits. We’re looking forward to the next phase when we will get the opportunity to test that model.”
Mr. John Utley, Technical Director:
“Historic drilling has outlined a zone of supergene gold mineralisation at Fugitive. Whilst there’s only sparse drilling below 50m vertical depth, we can see evidence for a plumbing system extending beneath the shallow mineralisation. It’s an enticing drill target, over almost 700 metres of strike length.”
RC drilling at the Fugitive Prospect
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AWJ:AU
Justinian Cu-Au Prospect Extended Over 3km with 5.3g/t Au and Cu to 16%
Augustus Minerals has received new assays from ongoing soil sampling and rock chip sampling programs conducted on the Justinian prospect and adjacent areas at the Ti- Tree Project, in Western Australia
- High grade rock chips assaying up to 16% copper and up to 5.32g/t gold have been identified from field work over a 3.3 x 1.1km area
- The copper and gold identified in rock chips supports the anomalous soil sampling results from the recent regional survey.
- The soil and rock chip results define areas of Cu and Au anomalism related to splays of the Ti-Tree Shear wrapping around the Crawford Granite.
- Other anomalous soils have identified areas for further mapping and rock chip sampling north and west of Crawford Bore, and west of Coo Creek Broken Hill Style target.
- Elevated copper and lead in soils identified on a NE trending shear at Howell’s Gap
- Strong base metal anomalism over the Moogooree carbonate hosted Zn-Pb target.
Mapping and field work is continuing to increase the definition and tenor of anomalies to drill targets for future programs.
The soil samples, sieved in the field to pass -80#, were scanned by Portable Spectral Services (PSS) at their West Perth office under controlled conditions. In the western Ti-Tree area, above background levels of Cu, Pb and Zn were returned which defined adjacent or frequently coincident trends (Figure 2). Figure 3 shows Cu-in-soils and copper in rock chips. The validity of the soil anomalies was validated by some overlap between historic sampling using traditional wet assay methods and the new pXRF data.
Gold-in-soils was determined by 50g Fire Assay at Intertek’s Perth laboratory.
Figure 1 Prospects and VTEM Survey areas
Table 1 Significant Rock Chips Justinian (>0.1% Cu, 0.1g/t Au or 0.1% Pb).
Justinian Prospect
Review of soil sampling data from the regional soil program has identified several new targets and/or extensions to existing prospects.
Previous rock chip sampling1 identified gold to 10.1g/t at Justinian (Figures 1 and 2). Further rock chips within the soil anomaly have returned assays to 5.32g/t Au (WA001301) and 16% Cu (WA001310) (Table 1).
Justinian also shows anomalous levels of lead and zinc (Figure 2).
The mineralisation is dominantly hosted within the Leake Springs Metamorphics, a complex package of pelitic schist and fine-grained often garnet rich psammite.
Figures 3 and 4 show Au and Cu respectively in soil (pXRF results) and rock chips (four acid digest or aqua regia digest) at the Justinian prospect. The validity of the soil anomalies was validated by some overlap between historic sampling using traditional wet assay methods and the new pXRF data.
The Justinian prospect has been extended to cover a 3.2km x 1.1km area containing several distinct soil anomalies which appear to be coincident with diffracted splays of the Ti-Tree Shear around the Crawford Granite intrusions. It is possible that the diffraction around the more rigid granite bodies is causing dilation where the Ti-Tree Shear splays penetrate the host Leake Springs Metamorphics.
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Prospective IOCG Target Identified at the Coober Pedy Copper Project, SA
- Magnetic and gravity responses highlight the potential for IOCG mineralisation.
- Limited historical drilling data provides evidence for an alteration footprint.
- Project located at northern end of the world-class Olympic Dam IOCG Province.
AusQuest’s Managing Director, Graeme Drew, said the Company was encouraged by the results of the survey, which confirmed the potential for large-scale copper-gold discoveries within a Tier-1 mineral province.
“The recent gravity survey has provided support for the occurrence of IOCG-style mineralisation within our Coober Pedy Project, which is located at the northern end of a world-class IOCG Province which already hosts several major copper-(gold) deposits, including Olympic Dam, Carrapateena and Prominent Hill, as shown in Figure 1,” he said.
Figure 1: Coober Pedy Project Location Plan showing major deposits in the area.
A detailed gravity survey was completed by Daishsat Geodetic Surveyors (400m x 100m grid with selected in-fill lines at 200m) outlining possible targets for drilling. A residual gravity image is provided below showing two anomalous areas within a broader gravity response (~5km x 2km), that are associated with historic drill-holes that were found to contain potassic alteration (Figure 2).
Correlation with available aeromagnetic data shows that the gravity anomalies are offset from the stronger magnetic responses, suggesting the possibility of hematite rather than magnetite as a possible cause for the gravity anomalies (Figure 3).
Figure 2: Residual Gravity Image showing location of gravity stations and historic drill-holes (Vale 2015) containing potassic alteration
Figure 3: First Vertical Derivative magnetic image plus residual gravity contours showing the location of historic drill-holes relative to the magnetic and gravity anomalies.
Analysis of available geochemical data contained within historical company reports provided by Government (PIRSA)*, was used to highlight the presence of potassic alteration within both drill-holes (GAW_RC01 and RC02), and the presence of additional proximity indicator elements, including an enrichment in iron (Fe) within drill-hole GAW_RC01, that suggests the possibility of a nearby IOCG system.
The close association of hematite and magnetite with IOCG mineralisation is well known in the IOCG Province of South Australia, which hosts the world-class deposits of Olympic Dam, Carrapateena and Prominent Hill, and is the main reason why magnetic and gravity surveys are commonly used to identify targets for drilling in these areas.
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Deep Diamond Drilling Commences on Large Copper-Mo Porphyry System
- Diamond Drilling has commenced to target a large copper-molybdenum porphyry system at Minnie Springs.
- The deeper diamond drilling is designed to target beneath a 3km long by 1km wide copper molybdenum soil anomaly.
- Previous drilling at Minnie Springs intersected mineralisation, geology and an alteration halo consistent with the zoning of a large porphyry copper / molybdenum system.
- The drilling is supported by a co-funded drilling grant of up to $110,000 for 700m deep diamond drill holes under the WA Government’s Exploration Incentive Scheme (EIS) for the Minnie Springs prospect.
Andrew Ford, GM Exploration
“The commencement of the diamond drilling marks an exciting time for Augustus, with the first hole testing below the existing molybdenum mineralised zone and targeting a high- grade copper core of a porphyry system”
The diamond program scheduled for completion mid-November.
Minnie Springs
Minnie Springs hosts porphyry related Copper - Mo mineralisation that was previously drilled by Equatorial Mining and Catalyst Metals. A molybdenum Exploration Target has previously been defined by SRK Consulting for the historic drilling area as outlined below (Table 1)1.
Alteration mapping suggests a potential tilting of the Minnie Springs system to the northeast, with untested potential for higher grade Copper - Mo mineralisation below existing drilling within the potassic altered zone (Figure 1).
Table 1. Exploration target size estimate for Minnie Springs Molybdenum depositNote: Based on ~300 ppm Mo cut-off at 100% recovery.
Clarifying Statement: The potential quantity and grade of the exploration target is conceptual in nature, there has been insufficient exploration to estimate a Mineral Resources, and it is uncertain if further exploration will result in the estimation of a Mineral Resource.
Figure 1. Schematic cross section looking northwest showing porphyry copper-molybdenum deposit model (Pour and Hashim 2012 – inset at right) rotated 90 degrees and superimposed on existing and planned drilling2.
The program is supported by the WA Government’s Exploration Incentive Scheme (EIS) drilling grant of up to $110,000 for two 700m deep diamond drill holes at the Minnie Springs prospect.
The drilling is designed to provide a 550m deep, geological/geochemical/structural cross- section through the large 3km long by 1km wide copper molybdenum porphyry system.
Previous drilling at Minnie Springs intersected mineralisation, geology and alteration halo consistent with the zoning of a porphyry copper / moly system.
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High-grade REE & P2O5 Trench Results Returned from Tundulu to Assist with Metallurgy
Highlights:
- A total of 63 metallurgical samples were collected from 37 sample locations along high-grade historic trench (TUTR10) at Tundulu
- Sampling results returned up to a high of 3.35% TREO and 27.5% P2O5 over the sampled 83m length of trench TUTR10:
- an exciting component of the sampling results is the average HREO, being 13% of the TREO basket
- undetectable to very low levels of deleterious elements including mercury, lead and cadmium in the phosphorus (P) rich rocks confirms the exceptional grade quality of the phosphate at Tundulu; and
- the sampling is representative of the mineralised Bastnaesite and Apatite carbonatite rock types exposed within the trench
- Selected samples are being collected to form a 150kg composite to be sent for metallurgical analysis
- 5 bioavailability composite samples were also taken across various historical trenches at Tundulu, targeting phosphate-rich rocks, to determine the solubility of phosphate in the samples and understand its potential for direct fertilization
- Majority of samples showed excellent P solubility (using 2% citric acid) of over 40%, with one returning solubility of 81%. This is above the industry threshold of 9.4% P2O5 solubility using Citric Acid as the reagent in the acid leach process
- 9 samples representing predominant lithologies at Tundulu have been collected and will also be sent to RSC Australia for petrographic examination to validate the historical mineralogical and rock composition
- Samples from the Company’s recent reconnaissance soil and rock chip program at the Ngala Hill PGE, Cu & Ni Project have been submitted to SGS South Africa for analysis, with results expected towards the end of the month
Tundulu REE Project
Tundulu is formed of several hills in a ring around a central vent called Nathace Hill where the majority of the historic surface sampling and drilling was undertaken. The predominant geology at Nathace Hill is REE apatite hosting carbonatites and feldspathic breccia and comprises a large inner agglomerate vent. Mineral rich carbonatite also occurs at Tundulu Hill east of Nathace and Makhanga Hill west of Nathace and is previously unexplored and prospective for REEs and niobium mineralisation.
REE mineralisation remains open towards southern and western directions of Nathace Hill and potentially extends beyond the boundaries of the previously established mineralised area over Tundulu Hill. Initial indications of mineralisation appear to be high in valuable MREEs and low measurable radioactive uranium
(U) and thorium (Th). This compares favourably to Lynas Rare Earths’ Mount Weld Central Lanthanide Deposit where Th and U concentrations in the ore are approximately 660 ppm and 25 ppm respectively.1
Figure 1. Map of Tundulu license area (EL0731)
A total of 63 metallurgical samples were collected from 37 sample locations along high-grade historic trench (TUTR10) at Tundulu.
Sampling results returned up to a high of 3.35% TREO and 27.5% P2O5 (average of 0.85% TREO and 8.26% P2O5) over the sampled 83m length of trench TUTR10. The average HREO component of the TREO basket was 13%, with high-value heavy rare earth elements Dy & Tb contributing 2.5%. Undetectable to very low levels of deleterious elements including mercury, lead and cadmium in the P-rich rocks confirms the exceptional grade quality of the phosphate at Tundulu.
The sampling is representative of the mineralised Bastnaesite and Apatite carbonatite rock types exposed within the trench. Select samples are being collected to form a 150kg composite to be sent to for metallurgical analysis.
5 bioavailability composite samples were also taken across various historical trenches at Tundulu, targeting phosphate rich rocks. ‘Bioavailability’ is used for analysis on phosphorous rock sources to determine the solubility of phosphate in soils. This analysis is useful in determining whether a particular phosphate rock type is suitable for direct fertiliser applications where the phosphate would be applied directly to the soil for uptake.
The analysis has been undertaken at Nagrom metallurgical and analytical laboratory in Kelmscott, Western Australia under standard atmospheric conditions using 2% citric acid. The majority of samples showed excellent phosphorus (P) solubility of over 40%, with one returning solubility of 81%. The exceptional quality of the phosphate-rich rocks at Tundulu is manifested by their undetectable to very low levels of deleterious elements including mercury, lead and cadmium.
The metallurgical test work will aim to evaluate historical studies undertaken at Tundulu and assess the findings from a 2017 metallurgical report, completed by the previous operators of the licence. The test work will initially focus on validating the beneficiation results achieved by the previous laboratory.
Conducting test work at this early stage enables the Company to ascertain the preliminary viability of producing two product streams: namely a REE commercially saleable concentrate and a mixed phosphate concentrate containing rare earths.
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