Investigator Resources Limited (ASX:IVR) provides an update on the progress on metallurgical results carried out as part of the Pre-Feasibility Study ('PFS') on the Company's Paris Silver Project.The preliminary metallurgical results indicate that:
- Cyanide leach trials achieved weighted average silver recoveries around 74% with a range of 65% to 89% for the three main geometallurgical domains.
Additional scrubbing, flotation and mineralogical tests are continuing, aimed at recovering lead and more of the non-leaching silver.
These metallurgical results aim to enable the design and costing of a process flowsheet.
Investigator's Managing Director John Anderson said "The results reported by the metallur-gical consultants are consistent with 2013 testwork but require some further investigation to augment silver recovery and bring the processing options to a logical conclusion. This is expected to be reported in June 2018. The metallurgical performance of the Paris silver deposit is seminal in the decision to bring the Project into production and is worthy of the critical attention being applied to its' resolution."
The project lies within the Peterlumbo tenement on the northern Eyre Peninsula of South Australia (Figure1). The Paris silver deposit has an estimated Indicated and Inferred JORC Mineral Resource of 9.3 million tonnes at 139g/t silver and 0.6% lead (at a 50g/t silver cut-off) (Investigator ASX Release: 19 April 2017). The deposit occupies an area of about 400m by 1,600m with a shallow flat tabular geometry that is conceptually mineable by open-pit to 160m depth below the flat surface.
As announced previously (Investigator ASX Release: 21 October 2013), the results of initial standard metallurgical laboratory tests for the Paris Silver Project showed metallurgical performance in labora-tory trials conducive to conventional processing paths. The initial silver leach recoveries were in the range 65% to 75% for the samples of breccia mineralisation typical of most of the Paris deposit.
Metallurgical Investigations for the PFS
Following the release of the Paris Silver Mineral Resource estimate in April 2017, Investigator com-menced a phased PFS study with a central focus on metallurgical performance. An extended geomet-allurgical study of the geologically complex Paris deposit enabled the selection of four domains (Oxide; Breccia transitional - no Mg/Ca; Breccia transitional - Mg/Ca; and Dolomite) (Figure 2) for metallurgical testing of larger and more representative samples (Investigator ASX Release: 14 November 2017). The study is again being undertaken by the metallurgical testing and process engineering/flowsheet Company, Core Resources ("Core") in Brisbane.
Comminution testing showed that the Paris silver ore can be considered 'soft' and has relative low abrasive properties. This indicates potentially lower capital and power costs associated with the crushing and milling circuit (Investigator ASX Release: 14 November 2017).
In the 2018 study, Core has carried out flotation and leaching testwork, evaluating options for further improving silver recoveries, as well as identifying methods to recover lead/silver concentrate which was not examined in 2013.
Multiple mineralogical studies including scanning electron microscope work identified the main silver species as acanthite (silver sulphide - the most common globally mined silver mineral), chlorargy-rite/bromargyrite (silver chloride & bromide) and primary native silver. All species identified are gen-erally less than 30 microns in grainsize, and mostly less than 10 microns. The lead minerals are pre-dominantly galena (lead sulphide), laurionite (lead chloride) and coronadite (lead manganese oxide).
Grinding of the breccia ores to P80 of 53 microns (80% passing 53 microns) enabled 65% to 85% silver leach recoveries (Table A) by cyanide leaching with lead nitrate or hydrogen peroxide pre-condition-ing. The Dolomite domain returned 89% silver leach recoveries without pre-conditioning. The Oxide domain has performed poorly in leach trials thus far and, as this domain only hosts 5% of the resource it is discounted from the PFS. The balance of the silver that remained unleached is referred to as refractory silver. Ultra-fine grinding to 10 microns achieved improved silver recoveries in similar leach trials, but is unlikely to be an economic pathway.
Flotation and gravity tests were undertaken to assess the recovery of lead in concentrates along with some of the refractory silver in the Breccia Transitional (no Mg/Ca) domain. These tests produced concentrates with poor lead recoveries of approximately 8% in a flotation concentrate and 24% in a gravity (Knelson) concentrate. The unrecovered lead is attributed to the coronadite content and fine galena inclusions in quartz.
Additional scrubbing tests are being completed aimed at rejecting gangue minerals ahead of leaching. Additional flotation tests are investigating options for further upgrading of the silver and lead concen-trates.
Mineralogical studies have thus far identified very fine-grained native silver inclusions in quartz as one of the refractory silver species. On-going scanning electron microscopy is seeking further avenues to optimise the silver recovery.
Core will prepare a process flowsheet, mass and water balance/model, process description and a final process report for inclusion in the PFS in June 2018.
The Company is considering further testwork using CELP (CANMET Enhanced Leaching Process) tech-nology.
Other work towards the Paris Pre-Feasibility Study
Geotechnical, waste characterisation and infrastructure costing studies are on-going and will be re-ported as final reports are received. The completion of the metallurgical and geotechnical studies will enable the Company to make a decision on the future of the Project.
To view tables and figures, please visit:
http://abnnewswire.net/lnk/2M5L8G23
Mr John Anderson Managing Director Investigator Resources Limited info@investres.com.au Phone: 08 7325 2222 Mr Peter Taylor Investor Relations NWR Communications peter@nwrcommunications.com.au Phone: 041 203 6231
Speedcast International Limited (ASX:SDA) (FRA:7SC), the world's most trusted provider of remote communication and IT services, today announced the pricing of its US$425 million Senior Secured Credit Facility (the "Term Loan") in the US institutional Term Loan B market with participation by key global financial institutions. The Term Loan has a term of 7 years and a coupon of LIBOR + 2.50%. In addition, Speedcast has arranged a new 5-year US$100 million Senior Secured Revolving Credit Facility. 
Rumble Resources Ltd (ASX:RTR) ("Rumble" or "the Company") is pleased to provide an update on the scheduled drill program at the Munarra Gully Cu-Au Project (with Ni - Co potential) ("Munarra Gully") some 50km NNE of the town of Cue within the Murchison Goldfields. 
Emerging Australian lithium developer, Core Exploration Ltd (ASX:CXO) ("Core" or the "Company") is pleased to announce that it has entered into a binding Subscription Agreement with Ya Hua International Investment and Development Co. Ltd ("Yahua"), which is wholly owned by Sichuan Yahua Industrial Group Co. Ltd ("Yahua Group"), one of China's largest lithium hydroxide and carbonate producers, for a placement of $1.4 million to Yahua ("Placement"). This Placement is in addition to the initial $2.0 million placement to Yahua announced on 29 August 2017 and further demonstrates Yahua's support for Core's lithium projects. 
Altech Chemicals Ltd (ASX:ATC) provide the latest Company Presentation.
Speedcast International Limited (ASX:SDA) (FRA:7SC), the world's most trusted provider of remote communication and IT services, and Plug and Play, the world's largest global innovation platform and startup accelerator, announced a strategic partnership focused on the advancement of technology within the communication and IT services sector. 
Envirosuite Limited (ASX:EVS)(FRA:57P) is pleased to provide an update on its progress with the UK-based water utilities group Thames Water, the UK's largest water and wastewater services company. Thames Water has now committed to an Envirosuite subscription at a fourth site. 
Blackham Resources Limited (ASX:BLK) (OTCMKTS:BKHRF), (Blackham or the Company) is pleased to present an update on successful initial drill results from the Wiluna free milling deposits. During March'18 and April'18, Blackham's exploration team drilled 130 RC holes (11,446m) focused on delineating further free milling open pit reserves over the 3.7km's of strike at the Wiluna Mine. Wiluna Mine drilling is expected to conclude in mid-May and resources will be re-estimated at that time. 
Intermin Resources Limited (ASX:IRC) ("Intermin" or the "Company") and JV partner AXF are pleased to announce positive initial metallurgical testwork results from the Lilyvale prospect area, part of the Richmond vanadium project. The project is located in northwest Queensland and lies on the Flinders Highway and Great Northern railway, 500km west of the Townsville port and 250km east of Mt Isa (see Figure 1 in link below). The project comprises four main prospects (see Figure 2 in link below) in the Richmond and Julia Creek districts covering an area of 1,520km2 with a total Mineral Resource of 2,579Mt grading 0.32% V2O5 at a 0.29% cut-off grade (see Note 4 below). 
Sayona Mining Limited (ASX:SYA) (OTCMKTS:DMNXF) ("Sayona" or "Company") has today sent letters to eligible and ineligible shareholders respectively, in accordance with the ASX Listing Rules. 
Investigator Resources Ltd (ASX:IVR) provides the Company's latest Presentation at RIU Sydney Resources Roundup Conference. 
Emmerson Resources Limited (ASX:ERM) (OTCMKTS:EMMRF) provides the opportunity to view a video interview by ProactiveInvestors Stocktube with Rob Bills, Managing Director. 
Blackham Resources Ltd (ASX:BLK) (OTCMKTS:BKHRF) provides the Company's latest presentation titled "A Dominant Position in Australia's Largest Gold Belt". 
Core Exploration Ltd (ASX:CXO) ("Core" or the "Company") is pleased to announce a Resource upgrade for its Grants Lithium Deposit at the Finniss Lithium Project in the Northern Territory which has more than doubled the size of the Indicated Resource and substantially increased the Resource confidence ahead of Feasibility studies to be completed in 2018. 
Broken Hill Prospecting Ltd (ASX:BPL) (OTCMKTS:BPLNF) announces the Company now holds the largest Mineral Sands tenement position in World-Class Murray Basin. 
Environmental Clean Technologies Limited (ASX:ESI) (ECT or Company) is pleased to provide the following statement regarding provisions within the Federal Budget that impact the business. 
Core Exploration Limited (ASX:CXO) is pleased to announce that it has issued 26,415,094 fully paid ordinary shares as announced on 7 May 2018. The Company has issued the Shares to Ya Hua International Investment and Development Co. Ltd under a share placement raising $1,400,000 (before costs). 
Cryptocurrency Exchange Binance.com (CRYPTO:BNB) advise that BCN/BNB (CRYPTO:BCN), BCN/BTC and BCN/ETH trading pairs are now available on Binance for trading. You can start depositing and trading BCN now. 
Kingston Resources Limited (ASX:KSN) (Kingston or the Company) is pleased to announce that drilling has commenced at the Misima Gold Project. The major diamond drilling campaign is targeting extensions to the existing 2.8Moz gold resource and drill-testing of newly discovered exploration targets at Umuna East Side. Kingston anticipates drilling 10,000m this year. This will be the first gold exploration drilling on Misima for more than 15 years. The arrival of freight barge MV Sea Swallow at Misima in late April was an historic event welcomed by the local community. 
MMJ PhytoTech Ltd (ASX:MMJ) provides the Company's latest presentation. 
