Related Document. Vancouver, BC - Cypress Development Corp.
DOE PROJECT MANAGEMENT NNSA Should Ensure Equal Consideration of Alternatives for Lithium Production. Why GAO Did This Study. An isotope of lithium is a key component of nuclear weapons and is. Lithium production strategy, also identifies various actions that it could take to. 17 Lithium Projects With Resource Estimates Teresa Matich - May 18th, 2016 The lithium market is booming, and more and more junior mining companies are jumping into the lithium space.
(TSX-V: ) (OTCQB: ) (Frankfurt: ) (“Cypress” or the “Company”) is pleased to announce it has filed a National Instrument (NI) 43-101 Technical Report on SEDAR titled “Resource Estimate Clayton Valley Lithium Project'. The Technical Report details the independent Mineral Resource Estimate for the Company’s 100%-owned lithium project in Nevada, as described in the Company’s press release of, 2018. Global Resource Engineering (GRE) of Denver, Colorado, prepared the Technical Report which is the first estimate of resources for Cypress’ property.
The report carries an Effective Date of May 1, 2018 and Issue Date of June 5, 2018. The report includes recommendations for further work including a Preliminary Economic Assessment (PEA) which GRE expects to complete in the next two months.
Todd Harvey, Hamid Samari, and J. Brown of GRE are the Qualified Persons for the report. Highlights:. Total Indicated Mineral Resource of 697 million tonnes at an average grade of 886 ppm Li, or 3.287 million tonnes of lithium carbonate equivalent (LCE). Total Inferred Mineral Resource of 643 million tonnes at an average grade of 852 ppm Li, or 2.916 million tonnes of LCE. The mineral resources are reported using a cut-off grade of 300 ppm Li and constrained to pit shell reflecting a $15/tonne operating cost, $10,000/tonne of LCE price and 80% net recovery to LCE.
Minor changes in the resource model occurred following the May 1, 2018 press release due to adjustments in model boundaries. The proportion of indicated to inferred tonnes increased somewhat while the net lithium tonnes in the model decreased slightly. The resources are broken down into five units which are distinguished by stratigraphic position and color (Table 1). The middle three units are higher grade and estimated to average greater than 950 ppm Li, whereas the uppermost and lowermost units average less than 700 ppm Li. GRE generated an initial pit outline capable of supporting several decades of mining at a production rate of 10,000 to 15,000 tpd (Table 2).
The initial pit contains an indicated resource of 191 million tonnes averaging 988 ppm Li (1.007 million tonnes LCE), and an inferred resource of 25 million tonnes at 1,047 ppm Li, (0.142 million tonnes LCE). Joely on flowvella youtube. Selective mining of higher grade material, i.e.
Targeting the middle three units, will be an option considered in the PEA. Metallurgical bench tests from three drill holes, two of which are within the initial pit area, indicate agitated tank leaching with sulfuric acid is a viable method for extracting lithium. Tests indicate leach times of under 8 hours with relatively low consumptions of acid and other reagents. Sulfuric acid is expected to be the major component in operating costs, and alternatives for acid supply will be considered in the PEA. Five to ten drill holes in the initial pit area are recommended by GRE to convert resources into higher confidence categories and to obtain material for further metallurgical testing. This drilling is not required for the PEA but recommended to advance the project quickly.
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GRE additionally recommends proceeding with collecting environmental baseline data, and conducting hydrogeology and geotechnical studies. Details of the Mineral Resource Estimate GRE estimated the Mineral Resource using a database of 23 drill holes for 1,891 metres, drilled by Cypress during 2017 and 2018. The resource was calculated using a 2.5-dimensional (2.5D) gridded model (common for layered sedimentary deposits) of six mineralized stratigraphic units, which includes a thin surficial gravel unit, and verified using a 3-dimensional (3D) block model. The mineralized intercepts in the drill holes and a 3D interpretation of the geology and intercepts were done by Terre Lane and J.J.
Brown of GRE, who are Qualified Persons under NI 43-101. Clayton Valley Lithium Project 3D Drill Hole View: All samples for the project were assayed at ALS Chemex or Bureau Veritas, both ISO-9000 certified laboratories.
The resulting assay intervals were composited for the entire sedimentary unit for the 2.5D gridded model and were composited to a 5m down-hole length for the 3D estimate. Grade capping of lithium values was not required. Model grades were interpolated in Techbase using an inverse distance squared algorithm. A tonnage factor of 1.7 tonnes per cubic meter was selected based upon general published values to represent the insitu density. Indicated Mineral Resources were defined as being within 300 meters of a drill hole, with the Inferred mineralization requiring 2 drill holes within a search ellipse of 1500 x 800 metres for each unit.
The major axis was orientated north-south along valley. The sedimentary units were truncated at the Angel Island volcanic package and claim boundaries. The mineral resources reported use a cut-off grade of 300 ppm Li, reflecting a $15/tonne operating cost for mining, processing and G&A. The costs reflect a 10,000 – 15,000 tonne per day mining operation in soft sedimentary material that does not require blasting. Cost assumptions for the cut-off grade include a delivered acid cost of $80/tonne and 100 kg acid per tonne of material processed.
An overall lithium recovery of 80% was employed for the mineral resource based on the results from laboratory testing and confirmation leach testing at Hazen in Golden, Colorado under direction of Dr. Todd Harvey, who is Qualified Person in Metallurgy under NI 43-101 from GRE. The preliminary metallurgical examinations indicate that the claystone responds well to conventional weak acid leaching with no upstream size reduction required. Initial results indicate that lithium extractions of greater than 80% can be achieved. Expected leach conditions of 2 – 8 hours of leaching with 5% sulfuric acid at temperatures ranging between 50 and 80 °C are anticipated.
Clayton Valley Lithium Project Leach Kinetics: The preliminary leach results indicate relatively high grade pregnant leach solution (PLS) can be produced containing Li, K, Na and limited deleterious elements and a conventional downstream lithium recovery circuit should be applicable to produce saleable lithium carbonate or lithium hydroxide. Clayton Valley Lithium Project Conceptual Production Flowsheet: GRE concludes Cypress’ Clayton Valley Lithium Project has the potential to be a major supplier of lithium products in the world, and additional work is warranted.