Uranium Price Sensitivity
The table below outlines the project financials at both US$60/lb U3O8 and US$50/lb U3O8.
Table 5: Project Financials
Item |
Uranium Price |
US$60/lb U3O8 |
US$50/lb U3O8 |
|
|
Project cashflow total (pre-tax) |
US$351 M A$501 M |
US$261 M A$373 M |
|
|
|
Project cashflow - per annum (pre-tax) |
US$23.4 M A$33.4 M |
US$16.3 M A$23.3 M |
|
|
|
Project cashflow total (after-tax) |
US$289 M A$412.9 M |
US$204 M A$291.4 M |
|
|
|
Project cashflow - per annum (after-tax) |
US$19.2 M A$27.4 M |
US$13.6 M A$19.4 M |
|
|
|
NPV8 (including royalties, pre-tax) |
US$114 M A$162.9 M |
US$60.5 M A$86.4 M |
|
|
|
NPV8 (including royalties, after-tax) |
US$89.9 M A$128.4 M |
US$44.9 M A$64.1 M |
ECA Finance Status
As previously advised (see ASX Announcements, dated 30 January 2019 and 25 September 2019) Aura has been progressing a financing strategy for the Tiris project with the debt portion focussed around the low-interest coupon ECA finance. This process, through its London-based financial advisory firms, SD Capital Advisory Limited and GKB Ventures Limited, has continued and recently met with positive feedback.
At this stage seven Export Credit Agencies have expressed ongoing interest in reviewing the Tiris Finance Package and this included some of the major ECAs. A number of these agencies have indicated interest to act on a sole basis.
There was good interest and capacity in funding Mauritanian projects with some ECAs indicating ability to provide Direct Lending at OECD CIRR* rates and also indications they are able to provide guarantees covering 100% of the political risks and 100% for the commercial risks.
This ECA process was not a formal application process and none of the responses are a formal indication to provide financing support for the projects. The Company has not completed any formal agreement at this time with an ECA.
Water
Following a period of initial geophysical evaluation Aura has been conducting a significant and broad based round of water drilling for the Tiris uranium project since the middle of 2019 which has reported significant success. Of 5 targets tested to date, 2 have reported significant water flows, a strong validation of the geophysical program.
As previously reported (see ASX Announcement, dated 25 September 2019) the water program is testing targets generated from the geophysics and is focussing on targets within 30 km of the proposed Tiris plant site. The current drilling program will test 9 or 10 of the highest priority targets.
Target 22 yielded the following water, based on air-lift water flow measurement:
· 30-44m: 14,000 Lt/hr
Conductivity of this water was reported at 3200 µS/cm which indicates it is only moderately saline. For comparison, potable water is generally <2500 µS/cm while seawater is approximately 50,000 µS/cm. Water of this salinity is likely to be suitable for processing at Tiris, depending on precise water chemistry.
Target 10 has yielded a flow of ;
· 63m: 3000 Lt/hr
The drilling rig encountered mechanical problems at 69m and the hole is not yet complete.
Ironically the Sahara region has experienced unusually heavy rainfall in the last week making movement difficult and drilling has been temporarily suspended for approximately 10 days until access is again possible.
Aura believes the current results confirm its long held position that significant water exists within the Oued el Foule Depression as discovered in a number of the deeper drillholes during evaluation drilling into the Tiris uranium mineralisation.
Reserve Estimate
The Ore Reserve estimate was generated by Mining Plus. The overall project financial model was prepared by Aura using inputs from the mining schedule physicals and the cost model. Detailed processing, tailings disposal, power, water, camp infrastructure and logistics, and other costs were also developed as part of the Feasibility Study. Mining Plus reviewed the cash flow model with Aura to ensure that the project has a positive cash flow outcome, and this has been confirmed.
The declared Ore Reserve, at a 175 ppm U3O8 cut off is shown in Table 6.
Table 6: Ore Reserve (see ASX Announcement, dated 1 May 2018)
Description |
Mt |
U3O8 (ppm) |
U3O8 (Mlb) |
Lazare North |
Proved |
0.7 |
354 |
0.6 |
Probable |
4.4 |
332 |
3.2 |
Lazare South |
Proved |
1.5 |
342 |
1.1 |
Probable |
0.7 |
340 |
0.5 |
Hippolyte |
Proved |
1.9 |
331 |
1.4 |
Probable |
1.7 |
334 |
1.3 |
Total |
Proved |
4.1 |
339 |
3.1 |
Probable |
6.8 |
333 |
5.0 |
Total |
10.9 |
336 |
8.1 |
The Ore Reserve was generated from the Mineral Resource Estimate produced by H&S Consultants (Sydney) with the appropriate modifying factors to apply for mining dilution. This Resource model was used in an open pit optimisation process to produce a range of pit areas using operating costs and other inputs derived from previous studies. Mining costs were built up from estimates derived from equipment supplier and mining contractor submissions and applied to a detailed mine schedule.
The Ore Reserve is based on information compiled by the following:
· Revenue prices, based on historical averages and forward estimates, based on Offtake Agreement with Curzon Resources provided by Aura (see ASX Announcement, dated 29 January 2019).
· Processing recoveries based on the geo-metallurgical model developed by Aura.
· Mineral Resource estimate, H&S Consultants, (see ASX Announcement, dated 1 May 2018)
· Pit optimisation and mine design completed by Mining Plus.
· Capital costs, Mining Plus, Mincore, Simulus Engineers, Adelaide Control Engineers (ACE) and Aura.
· Operating costs, Mining Plus, Mincore, Simulus Engineers, ACE and Aura.
Vanadium Potential
Vanadium occurs with uranium in carnotite, the host mineral for uranium in the Tiris Project as potassium uranium vanadate (K2(UO2)2(VO4)2·3H2O). Vanadium hosted with carnotite is leached alongside uranium in the Tiris extraction circuit. Aura has conducted preliminary evaluation on the feasibility of vanadium recovery from solution. The Tiris project value, which is driven by low operating and development capital costs, would benefit further with vanadium recovery which is considered technically achievable.
Vanadium occurs in the Tiris ore at a grade of 330 ppm V2O5 , a similar concentration to that of U3O8. Approximately half of this vanadium occurs within the uranium host mineral carnotite
Comparison with Scoping Study
In 2014, Aura released a Scoping Study on the Tiris Project (see ASX Announcement, dated 16 July 2014) and it was updated in 2017 (see ASX Announcement, dated 24 May 2017). In general, the results of the DFS support the ongoing confidence Aura has had in the project since 2014.
The comparison of the DFS capital cost estimate with the Scoping Study showed an increase of 21% from the 2014 escalated estimate. This is a good result given the greater detail in the DFS estimate. Importantly, the estimate for the main processing facility was within 3% between the studies.
Comparison of estimated OPEX demonstrated an overall reduction in operating costs between the Scoping Study and DFS of 14%. These reductions were predominantly achieved in optimisation of reagent consumption.
When compared with the August 2017 operating cost adjustment, the increase is largely attributed to the decision to utilise contract mining, rather than an owner operated fleet. This transferred expenditure from Capital to Operating costs and accounts for a significant proportion of the operating cost difference.
Table 7: Comparison of Scoping Study and DFS CAPEX estimate. 2014 Scoping Study costs escalated to 2019 values for comparison purposes.
Description |
Scoping Study 2014 |
Scoping Study esc to 2019 |
DFS 2019 |
|
US$/M |
US$/M |
US$/M |
Mining |
1.12 |
1.30 |
0.00 |
Process Plant |
22.07 |
25.59 |
25.01 |
Infrastructure |
9.03 |
10.47 |
17.88 |
EPCM |
3.19 |
3.70 |
4.45 |
Owner's cost |
1.58 |
1.83 |
10.02 |
Contingency |
8.05 |
9.33 |
5.57 |
Total Capital Cost |
45.04 |
52.21 |
62.94 |
Next Steps
Aura will now focus its attention to:
Primarily securing the funding package for the Tiris Uranium Project.
Further optimise elements of the Tiris DFS.
Complete the full water drilling program.
The Export Credit Agency finance process, as discussed, is beginning to create extensive interest for the funding of the project.
ECA finance allows national governments to provide support to development projects in a range of sectors and in return for that support, the project developer is required to source a significant proportion of a project's goods and services from the host country.
HÄGGÅN BATTERY METALS PROJECT, SWEDEN (AURA 100%)
With diamond drilling aimed at upgrading a substantial portion of the Häggån resource to Measured and Indicated status concluded in the March quarter work continued for the Häggån Resource Upgrade which was completed in the quarter.
Aura advised the results from its 100% owned Häggån Battery Metals Project, Sweden resource resulted in a new Global Resource of 2 Billion tonnes at an average grade of 0.3% V2O5, containing 13.3 Billion lbs V2O5, at a 0.2% V2O5 cut-off, which includes 320 million lbs V2O5 as Indicated Resource (see ASX Announcement, 18 August 2019 and 10 October 2019).
Importantly, the infill drilling and modelling work has confirmed 42 million tonnes at 0.35% V2O5 at 0.2% V2O5 cut-off as Indicated Resource in a coherent near-surface zone.
Häggån is a large poly-metallic deposit containing economically significant levels of V (vanadium), Ni (nickel), Zn (zinc), Mo (molybdenum) and other metals. Resource estimates have previously been conducted and reported on the Häggån Project in 2010, 2011, 2012 and 2018 and since then additional infill drilling has been carried out.
In summary, the new Resource Estimate at Häggån, at a range of V2O5 cut-offs, is presented in Table 1. The 0.2% V2O5 cut-off is used to report the Häggån Resource Estimate.
At a higher cut-off grade of 0.4% V2O5, the resource contains approximately 113 million tonnes at an average grade of 0.43% V2O5, containing 1.1 billion lbs of V2O5.
Of particular interest within this global resource, is the definition as Indicated Resource of a coherent zone of mineralisation of 42 million tonnes at +0.35% vanadium pentoxide commencing at surface and extending to +100 metres below surface. This is referred to as the Northwest High-Grade zone.
The Resource Estimate is based on 16,500m of diamond drilling in 91 drillholes. The Indicated Resource is based on 3,530m in 25 diamond drillholes.
The high-grade V2O5 zone defined as Indicated Resource is open in all horizontal directions. More drilling will be required to define the limits of the high-grade resource.
Project Location
The Häggån Project is located in central Sweden in a rural area, approximately one hour by car from the city of Östersund in the province of Jämtland. Östersund is well served by national and international air services, by rail and by road.
Häggån Tenements
Through its 100% owned Swedish subsidiary Vanadis Battery Metals AB, Aura holds five exploration permits, totalling 57.6 km2 over and around the Häggån resource. The entire Häggån resource lies within one of these, Häggån nr1 which covers 18.3 km2. The Häggån nr1 permit is currently in its final period of tenure which expires on 28 August 2022. After this the area can be retained as a mining licence.
Geology
The Häggån polymetallic mineralisation lies within a Cambrian to Lower Ordovician age geological unit known as the Alum Shale Formation. The Alum Shale was laid down within an ancient ocean which formed when what is now Greenland rifted apart from Scandinavia. The shallow marine waters coupled with prolonged stability resulted in the deposition of highly bituminous shales. This shale facies is generally between 10 and 60 metres thick and extends sporadically in Scandinavia from northern Norway to southern Sweden. The Alum Shale contains elevated but variable levels of a number of metals, principally vanadium, nickel, molybdenum, zinc, cobalt and in places copper and uranium. These metals are believed to have been derived by weathering of granitic rocks in the adjoining Fennoscandian Shield and transported to the Iapetus Sea where the extreme anoxic conditions allowed the metals to precipitate or chelate with organic matter during sedimentation.
During the mid-Palaeozoic the former sea closed due to the collision of the Laurencia (Greenland) continental plate with the Baltica plate (Scandinavia). This collision resulted in thrusting of the lower Palaeozoic sequences, including the Alum Shale, from the west to the east over older basement rocks of the Fennoscandian shield. Together with slices of older basement, the sedimentary rocks were thrust several hundred kilometres eastwards over the edge of the Fennoscandian Shield in several large sub-horizontal thrust sheets c. 400 Ma ago.
Häggån lies close to the eastern edge of this sedimentary thrust-sheet package. (Refer to Figure 4 in the full RNS version).
Mineralisation
The mineralisation in the Alum Shale in the area investigated by Aura is enriched in various elements, principally:
· Vanadium
· Nickel
· Molybdenum
· Cobalt
· Zinc
Vanadium occurs within the lattice of the mineral roscoelite, a variety of mica. Nickel, molybdenum, cobalt and zinc are present as sulphides. All minerals, with the exception of recrystallised carbonates, are very fine grained, typically around 10 microns in grain size.
The highest metal concentrations generally occur in the upper parts of the Alum Shale, and the highest vanadium grades in the Aura licences appear to occur in the upper thrust sheet.
The NWHG Zone here extends approximately 1 kilometre in both north-south and east-west directions. The coherence of this zone is shown in both cross-sections and plan in Figures 7 and 8 in the full RNS version.
Potential to Expand Measured/Indicated Resources
The 2018/19 resource upgrade drilling program was designed for cost reasons to upgrade approximately 70% of the resource on which a scoping study will be based into measured/indicated categories. However, the recent infill drilling has not defined the limits of the high grade (+0.4% V2O5) mineralisation. There is therefore excellent potential to expand the Indicated Resource on high grade mineralisation.
TASIAST SOUTH GOLD PROJECT, MAURITANIA (AURA 100%)
During the quarter Aura commenced field activities and data review on its granted exploration licences for its gold, base and battery metal tenements in Mauritania (see ASX Announcements 3 April 2019 and 17 October 2019).
The work included field inspections, geological mapping of structures and the review and confirmation of previous drill data for both the gold projects and the nickel cobalt projects.
The tenements of 435 km2 are in a highly prospective area lying on two lightly explored mineralised greenstone belts in Mauritania (See Figure 9 in full RNS). The areas lie along strike from Kinross' giant +20 Moz Tasiast Gold Mine, where Franco Nevada own a royalty, and from Algold's Tijirit gold deposits. Importantly, Kinross has also recently announced that it will expand gold production at Tasiast to 530,000 ounces per year.
Aura maintains that these tenements, with the single large Tasiast gold mine along strike, and strong base and battery metal results from limited previous exploration, represent some of the best under-explored greenstone belt targets in the world.
Aura recently commenced field activities with initial field inspection to locate artisanal mining sites, determine the extent of outcrop and assess access to enable planning of further evaluation activities.
Additionally, ongoing compilation and re-interpretation of data gathered from previous exploration campaigns has highlighted the following important aspects;
1. Additional gold intersections on the Ghassariat prospect some 1.5 kms from the previous mineralised section indicating potential for a large mineralised gold system
2. Existence of a large untested magnetic anomaly on the Bella prospect interpreted to reflect an unusually large ultramafic complex prospective for nickel and cobalt. This has been tested so far only by a single line of bedrock drilling near its southern margin and this yielded strong nickel and cobalt values
3. This complex within Bella has 5 additional lines of previously proposed drilling across magnetic highs which have not yet been executed
4. Strong, previously unreported, nickel/cobalt/copper values on the Taet permit
5. The Taet intercepts include strong copper values which may indicate the presence of nickel sulphides
Two artisanal pit locations were recorded, both small. As much of the Aura permit areas are under shallow cover or laterite the area is not generally attractive to artisanal miners.
Additional gold intersections on the Ghassariat prospect
Air-core drilling to bedrock by the previous explorer located several anomalous gold zones, up to eight kilometres in length (See Figure 10 in full RNS). Of particular interest is the Ghassariat Zone, which has 1-3 g/t gold values on three of the four air-core traverses drilled. This anomaly extends over about eight kilometres parallel to the strike of the greenstone belt.
The Ghassariat Prospect intersections occur in strongly sulphidic and quartz-veined mafic volcanics and have marked similarities with some of the ore zones and near-ore alteration zones at the neighbouring Kinross Tasiast Mine (See Figure 9 in full RNS).
Drilling to date has been principally shallow vertical air-core to sample the bedrock beneath shallow cover, with limited deeper RC testing below the air core drilling. A small number of RC holes have provided good results, however, the density of drilling is very low averaging approximately one hole per 20 km2. A systematic program to ensure both deeper drilling under existing drill results and further shallow drilling on new targets is being planned.
Intersections in the Ghassariat Zone (see ASX Announcement Drake Resources Ltd 28 August 2012), confirmed by Aura's review of the drilling and assay data (refer Figures 11 and 12 in full RNS.
TGRC 022: 71m @ 0.3 g/t Au including:
· 5m @ 1.2 g/t Au,
· 3m @ 1.0 g/t Au
· 11m @ 0.5 g/t Au
TGRC 007: 38m @ 0.4 g/t Au including:
· 1m @ 6.1 g/t Au
· 10m @ 0.5 g/t Au
· 3m @ 0.9 g/t Au
Aura is encouraged by the fact that these intersections occur within broad mineralised intervals, indicating a substantial mineralised system, as opposed to narrow quartz veins. It should be noted that the nearest RC drill sections to these 2 holes are 1.5km away.
Aura's head of Geology, Neil Clifford commented "prior exploration here has been a first pass program directly along strike from the giant Tasiast gold deposit aimed at locating similar major deposits. The Ghassariat Zone, with existing RC holes on sections kilometres apart, could in fact be part of such a mineralised system. Interestingly, the Tasiast gold deposit is in Archean greenstones with strong similarities in terms of rock types, structure and mineralisation style with the great gold provinces in the Archean greenstone belts of Australia and Canada in which there have been many hundreds of gold mines. In the Tasiast district there is currently only one, reflecting how little explored this belt is. Clearly the potential for additional and substantial discoveries in the Tasiast district is very high", Mr Clifford said. "The Archean greenstone belts in Western Australia and Canada also contain many nickel deposits, and the early indications of this style of mineralisation on Aura's Tasiast properties are very promising", he continued.
Existence of a major untested magnetic anomaly on the Bella prospect
On a single line of shallow vertical aircore drilling on Bella permit, with holes spaced 100m apart, aimed at sampling bedrock, very strong nickel values were encountered over entire 1.6 km drill line with every hole that went deep enough intersecting nickel values between 0.5% and 1.0% nickel. (See Figure 13 in full RNS).
As indicated in Figure 14 in full RNS, the Bella Prospect is a major untested magnetic anomaly interpreted to reflect a large ultramafic complex. The location of the drill line in Figure 13 in full RNS within this ultramafic complex is shown in this figure.
It is notable that apart from this single line of sampling near its southern margin, this complex is untested. As shown by the blue lines in Figure 14 (see full RNS), the previous explorer had proposed five additional lines of bedrock drilling across magnetic highs which have not yet been executed.
Strong, previously unreported, nickel/cobalt/copper values on the Taet permit
On the Taet permit in the Tasiast Greenstone Belt, two reconnaissance lines of bedrock sampling for gold located strongly anomalous nickel values associated in places with strong cobalt and anomalous copper (See Figure 15 of full RNS). These occur within a complex of ultramafic rocks, interpreted to be komatiites (ultramafic lavas).
A number of major nickel (+cobalt, copper) sulphide orebodies in better explored Archean greenstone belts occur in this type of rock (e.g. Kambalda in Western Australia). Of interest on the Taet targets is the existence of anomalous copper in some of the aircore drillholes as elsewhere, this can be indicative of the presence of nickel/copper sulphides.
The previous drilling has tested only a small portion of this ultramafic complex and there has been no follow-up on the high Ni, Co values located. Additionally, the 100m drill spacing to date is very broad for the detection of nickel sulphide zones which can be narrow.
High grade cobalt drill intersections were obtained on both the 1.6 km long drill line at Bella and on the Taet permits. Although sampling by the previous explorer for cobalt was sporadic with only approximately 1 in 10 samples assayed, 14 samples exceeded 0.1% Co, 6 samples > 0.25% Co and 3 samples > 0.5% Co.
Gold program funding
Aura believes these projects, where +$3m has already been spent with considerable initial success in locating gold, nickel and cobalt, are valuable assets deserving substantial expenditure to achieve their full potential. The current price for gold and battery metals further enhances the value of the assets.
Aura has commenced the following process;
1. Approaches to several of the world's leading royalty companies
2. Engagement with several companies regarding listed shells to utilise for its gold assets
3. Review of a separate IPO
Aura expects that with the separate listing of the gold assets, similar to the proposed Häggån (Sweden) IPO, significant value will be attributed to Aura.
Aura will continue to progress this process but only conclude a transaction should a suitable value proposition be achieved. Aura welcomes any additional interested parties to the process.
Future Work Program and Other Opportunities
Next technical steps envisaged at Tasiast South are:
· Ground electrical geophysics to locate the strongest zones of disseminated sulphide development to assist drill targeting for both gold and nickel targets
· Systematic drilling and systematic drill testing (RC and DD) of targets already defined
· Airborne magnetic surveying of the Nomads JV area to better define geology and favourable structural zones.
· Additional bedrock sampling by air-core or auger-drilling to better define the high nickel ultramafic rocks and zones of copper/nickel for follow up drilling
CORPORATE
Appointment of New AIM Market (LSE) Nomad
During the quarter Aura concluded the appointment of SP Angel Corporate Finance LLP ("SP Angel") as Nomad for its UK AIM listing.
WH Ireland, the companies former Nomad, has been retained as a Joint Broker to the company.
Funding
Aura completed an R&D Loan Financing facility for $250,000 and received approximately $77,000 from subscribers to the loyalty options.