Elementos is a tin focused exploration and development company
- Elementos owns 100% of the Cleveland Tin Project in Tasmania
- Located 80km southwest of Burnie in the mineral rich northwest region of Tasmania, Australia
- Excellent power, water and transport infrastructure in place
- Operated as an underground mine from 1908 – 1917 and more recently by Aberfoyle Resources from 1968 – 1986
- Total ore mined – 5.65mt @ 0.68% Sn & 0.28% Cu, producing 23,519t of Sn and 9,691t of Cu
- Mine closed in 1986 due to tin price collapse with hard rock JORC resources of 7.44mt @ 0.65% Sn & 0.25% Cu and 3.97mt @ 0.28% WO3 remaining
- Historical workings extend more than 400m below the surface
- Mechanised sub-level overhead benching mining method
- Conventional cassiterite recovery process of gravity followed by flotation
- Underground and surface infrastructure completely rehabilitated in1990
Cleveland Mill (early 20th century)
Cleveland Mine – 1980’s
- Cleveland consists of stratiform semi-massive sulphide replacement ore lenses within a carbonaceous sedimentary package, and a
- Quartz porphyry hosted tungsten bearing quartz-stockwork, greisen orebody below 350m
- Principle sulphide mineral is pyrrhotite (magnetic) with cassiterite and minor stannite and chalcopyrite
Cleveland Local Geology
Cleveland Exploration & Development
Elementos has a clearly defined development strategy for the Cleveland Tin Project.
Stage 1 – combined open pit mining and tailings re-treatment operation to produce tin and copper concentrates
Stage 2 – refurbishment and development of the underground mine to produce tin, copper and tungsten concentrates
Recent work has involved exploration targeting the physical limits of the potential open cut resource at Cleveland and refining the metallurgical processing flowsheet.
Recent exploration work has included a detailed ground magnetic survey followed by a 19 hole diamond drilling programme. The current exploration programme is focussed on updating the JORC resource following the completion of the diamond drilling programme.
Cleveland 2017-18 ground magnetic survey and diamond drilling plan
Cross Sections from Cleveland indicating recent drill results
A significant amount of testwork has been carried out on re-treating the significant tailings resource at Cleveland. Tailings recovery testwork to-date has developed a process to a 52% Sn concentrate with a 49% recovery.
Metallurgical testwork is being carried out on recently collected drill core hard rock lode samples to assess improvements in gravity and flotation processes since the underground mine last operated at Cleveland in 1986. The historical hard rock processing circuit produced a 55% Sn concentrate with a 55% recovery.
Cleveland proposed processing flowsheet
Enhanced Tin Processing
Elementos is investigating alternative methods to process low to medium grade tin ores, utilising existing technology to improve yield and project economics.
Laboratory scaled testwork by Elementos on the Cleveland tailings resource has shown a 50% improvement in the yield of tin to a low grade concentrate (~10% Sn).
Follow-up laboratory scaled testwork using conventional technology has been successful in producing a high value tin metal product.
Further work is ongoing to optimise this process.