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Ucore Completes Underground Mine Design for Bokan Project
http://www.marketwatch.com/story/ucore-completes-underground…
http://www.marketwatch.com/story/ucore-completes-underground…
https://estore.infomine.com/an-introduction-to-cut-off-grade…
An Introduction to Cut-off Grade Estimation
Does the material being mined have enough value to be worth processing? Should it be processed immediately or stockpiled? And if multiple processes are available, like heap leaching and milling, which one should be used?
A cut-off grade can provide the answers.
An Introduction to Cut-off Grade Estimation examines one of the most important calculations in the mining industry.
Cut-off grades are essential to determining the economic feasibility and mine life of a project. Increased cut-off grades can reduce political risks by ensuring higher financial returns over a shorter period of time. Conversely, lower cut-off grades may increase project life with longer economic benefits to shareowners, employees, and local communities.
Cut-off grades also impact reported reserves, which are closely monitored by stock exchanges and regulatory agencies.
Author Dr. Jean-Michel Rendu, an internationally recognized expert in the management, estimation, audit, and public reporting of mineral resources, provides practical insights into this critical variable.
You’ll learn about minimum cut-off grades, as well as those for deposits containing multiple valuable minerals.
Dr. Rendu explains which costs should be included in cut-off grade calculations and considerations when planning open pit, underground, and block and panel caving operations. He shows how to optimize a copper mining project by changing grind size, and demonstrates the relationship between deposit modeling, ore control, and cut-off grades.
An Introduction to Cut-off Grade Estimation includes dozens of charts, graphs, and mathematical formulas to explain basic concepts in a simple, step-by-step fashion.
It is a “must read” for mine managers, analysts, geologists, mining engineers, and public policymakers who want to stay on the leading edge of their profession.
Contents
•Introduction
•Minimum Cut-off Grades
•Cut-off Grade for Polymetallic Deposits
•Cut-off Grade and Optimization of Processing Plant Operations Conditions
•Cut-off Grade and Mine Planning—Open Pit and Underground Selective Mining
•Cut-off Grade and Mine Planning—Block and Panel Caving
•Which Costs Should Be Included in Cut-off Grade Calculations
•When Marginal Analysis No Longer Applies: A Gold Leaching Operation
•Mining Capacity and Cut-off Grade When Processing Capacity Is Fixed
•Mining Capacity and Cut-off Grade When Mining Capacity Is Fixed
•Mining and Processing Capacity and Cut-off Grade When Sales Volume Is Fixed
•Releasing Capacity Constraints: A Base Metal Example
•Relationship Between Mine Selectivity, Deposit Modeling, Ore Control, and Cut-off Grade
•Conclusions
By Jean-Michel Rendu. Published by SME in 2008. 112 pages.
PRICE: Can$91.00
An Introduction to Cut-off Grade Estimation
Does the material being mined have enough value to be worth processing? Should it be processed immediately or stockpiled? And if multiple processes are available, like heap leaching and milling, which one should be used?
A cut-off grade can provide the answers.
An Introduction to Cut-off Grade Estimation examines one of the most important calculations in the mining industry.
Cut-off grades are essential to determining the economic feasibility and mine life of a project. Increased cut-off grades can reduce political risks by ensuring higher financial returns over a shorter period of time. Conversely, lower cut-off grades may increase project life with longer economic benefits to shareowners, employees, and local communities.
Cut-off grades also impact reported reserves, which are closely monitored by stock exchanges and regulatory agencies.
Author Dr. Jean-Michel Rendu, an internationally recognized expert in the management, estimation, audit, and public reporting of mineral resources, provides practical insights into this critical variable.
You’ll learn about minimum cut-off grades, as well as those for deposits containing multiple valuable minerals.
Dr. Rendu explains which costs should be included in cut-off grade calculations and considerations when planning open pit, underground, and block and panel caving operations. He shows how to optimize a copper mining project by changing grind size, and demonstrates the relationship between deposit modeling, ore control, and cut-off grades.
An Introduction to Cut-off Grade Estimation includes dozens of charts, graphs, and mathematical formulas to explain basic concepts in a simple, step-by-step fashion.
It is a “must read” for mine managers, analysts, geologists, mining engineers, and public policymakers who want to stay on the leading edge of their profession.
Contents
•Introduction
•Minimum Cut-off Grades
•Cut-off Grade for Polymetallic Deposits
•Cut-off Grade and Optimization of Processing Plant Operations Conditions
•Cut-off Grade and Mine Planning—Open Pit and Underground Selective Mining
•Cut-off Grade and Mine Planning—Block and Panel Caving
•Which Costs Should Be Included in Cut-off Grade Calculations
•When Marginal Analysis No Longer Applies: A Gold Leaching Operation
•Mining Capacity and Cut-off Grade When Processing Capacity Is Fixed
•Mining Capacity and Cut-off Grade When Mining Capacity Is Fixed
•Mining and Processing Capacity and Cut-off Grade When Sales Volume Is Fixed
•Releasing Capacity Constraints: A Base Metal Example
•Relationship Between Mine Selectivity, Deposit Modeling, Ore Control, and Cut-off Grade
•Conclusions
By Jean-Michel Rendu. Published by SME in 2008. 112 pages.
PRICE: Can$91.00
Antwort auf Beitrag Nr.: 43.057.694 von FaxenClown am 18.04.12 23:03:05Nun, hier wird es demnächst nochmal rascheln und hoffentlicher etwas lauter als gestern. Stichwort "Preliminary Economic Assessment".
Zitat von Langstrumpf2: Hey, mal einige Bekannte hier. Mal sehen wir lang das haehlt.
.. ich würde es - in meinem Fall - mit "katzenartigem Interesse" umschreiben.
Alle schleichen auf Recherche herum ... und wenn es wo etwas lauter raschelt (wie heute bei Ucore), dann macht das neugierig.
Dann wird mal kurz reingeschnuppert - und wenn´s nimmer raschelt, geht man auch wieder. Aber ab und zu springen dabei auch mal ein paar Mäuse raus
MfG, FaxenClown
Hey, mal einige Bekannte hier. Mal sehen wir lang das haehlt.
Trading Spotlight
Zitat von 4now: das liest sich schon wesentlich besser als bei Stans,...
... naja, ich flechte mal die letzte News ein und dann sehen wir weiter:
540.000t Ore / a * 0,65% TREO * 94% Sort (und Mill?) Recovery
.... macht 3300t - unrepariertes REO-Conzentrat mit dem man in die SX geht (Recovery vom REO abhängig). Kommen also 3-3,3 ktpa Misch-REO und davon grob 1,1-1,3ktpa Misch-HREO bei rum, davon sind wiederrum 700-800t Yttrium, bleiben 450-500tpa "echte" Misch-HREO. Bei einer SX-Recovery von angenommenen 90-100%.
... ist zwar grob das 1,5- bis 2-fache an Output, was Stans beabsichtigt - aber die reine HREO-Menge ist in etwa vergleichbar (Ucore bekommt ca 20% mehr raus als Stans) , wenn man die grob 25% Yttrium bei beiden rausrechnet (also HREO-Y). Mit dem feinen Unterschied, dass bei Ucore das Misch-Konzentrat rauskommt und bei Stans (wahrscheinlich) separierte Oxide und/oder Metalle. Über den Wert von dem Rohmaterialien (Konzentrat) und die Wertsteigerung durch den Einsatz von Know How (also separierte REO, Metalle oder Downstream wie Alloys) unterhalten wir uns bei GWG ja genug, das lass ich mal aus.
Dazu kommt, dass Bokan eine reine Untergrund-Mine ist und Stans halt Open Pit ... je nach Strip-Ratio sind da die OPEX und CAPEX schon unterschiedlich.
Infrastruktur (Gas,Wasser, Schei*e ... und Transportwege) haben beide gleichermaßen - hier spar ich mir den Vergleich.
Die CAPEX fürs "reine Processing" spricht ein wenig für Bokan, weil Stans sich eine riesen Mill für bis zu 360Mio CAD (Lynas-Referenz = 36Mio$/120ktpa Ore) hinstellen muss und bei Ucore nur 80-100Mio für die Mill (nach 44% Ganggestein-Aussortierung, also 300ktpa Ore) ABER plus den Sortierer plus den Minenaufbau hinlegen muss - wieviel auch immer das sein könnte?!
Quelle für Recovery + Konzentrationsverhältnis des Sortierers (leider keine Kostenangaben):
http://ucore.com/ucore-confirms-effectiveness-of-xrt-ore-sor…
Bei beiden werden die Energiekosten auf die OPEX schlagen. Bei Stans halt für die energieaufwändige Mühle ... und bei Ucore für´s aufheizen beim leeching (150-300°C)
RARE EARTH RECOVERY FROM BOKAN MOUNTAIN, ALASKA.
By G.K. Green and D.D. Harbuck.
http://ucore.com/Green_%20Harbuck.pdf
Auf Grund der höheren Output-Menge von Bokan, sind dann die realen Umsätze und Gewinne in $ vielleicht höher als bei Stans (mit dem Unsicherheitsfaktor durch das minderwertige Mischprodukt), aber über ein höheres Verhältnis zwischen Aufwand und Ertrag bei Ucore würde ich nicht meine Finger ins Feuer legen - die Zahlen werden es irgendwann vielleicht zeigen, vielleicht irre ich mich ja auch mal.
... trotzdem schön, dass es (wenigstens hier) mal ein paar Zahlen gibt, auf die man bei Stans bereits lange wartet
MfG, FaxenClown
http://ucore.com/ucore-completes-underground-mine-design-for…
Ucore Completes Underground Mine Design for Bokan Project
April 18, 2012 – Halifax, Nova Scotia – Ucore Rare Metals Inc (TSX-V:UCU) (OTCQX:UURAF) (“Ucore” or “the Company”) is pleased to announce the receipt of an underground Mine Design (“MD”) study of the Bokan Heavy Rare Earth project on Prince of Wales Island in Alaska, USA (the “Project”). The MD was completed by Stantec, of Tempe, AZ.
The objective of the study was to recommend the most advantageous mining methodology from a range of alternatives, and estimate the capital and operating costs for the underground mine. The MD is an important component of Preliminary Economic Assessment (“PEA”) for Bokan, due in the near term. The responsibility for the overall PEA rests with Wardrop, A Tetra Tech Company (“Tetra Tech”).
The MD report recommends an appropriate mining methodology based on resource geometry and geotechnical considerations. Additional aspects of the study include the preparation of a conceptual mine plan and the estimation of the mine production rate and production schedule. The full Bokan MD report will be released on conjunction with the PEA, due in the near term.
“As our Preliminary Economic Assessment moves to completion, this underground mining study is an important component of logistical analysis”, said Jim McKenzie, President & CEO of Ucore. “The report affirms the mining potential at Bokan, and offers insight into the comprehensive PEA which is pending in the near term. The study sets out a crown pillar where the mineralisation outcrops at surface, resulting in a daylight expression that yields minimal environmental disturbance. The report also affirms that high grade content can be accessed close to mine mouth, with a prospective positive effect on initial construction cost and turnaround.”
“Further, the prospective minable resource size has been increased by 44% over prior estimates (from 3.7 million tonnes to 5.3 million tonnes)”, continued McKenzie, “due to a reduction of cutoff grade. The expected daily production rate for Bokan has also been increased by 50% over previous interim estimates (from 1000 to 1500 tpd), with a potentially material impact on rate of return. Our thanks to the engineering team that delivered this analysis on time and within budget.”
The MD report was based on the inferred mineral resource block model provided by Aurora Geosciences (Alaska) Ltd. and released by Ucore in March of 2011. After a review of the block model inventory at various TREO % cutoff grades, it was determined that 0.4% TREO would be utilized as an economic cutoff for the mine design. At this cut-off, the resource consists of 5.3 million tonnes of mineralization at an average grade of 0.65% TREO, of which 40% are HREO.
Based on a review of the geometry of the mineralized body, Stantec determined that blasthole stoping is the most appropriate mining methodology for the project. Blasthole stoping is a very productive and efficient underground mining method and is based on a designed mine production rate of 1500 tpd. The resultant production schedule forecasts 540,000 tonnes per annum. The MD report suggests the use of mill tailings as paste backfill to fill the mined out areas of the underground. This technique promises to minimize the need to store tailings in a management facility at surface.
The total required operating manpower of the underground mine is estimated at 118 persons, including mine administrative personnel. Mine personnel calculations are based solely on the underground portion of the mine, and are exclusive of personnel required for subsequent administration, surface operations and processing. Detailed capital and operating cost estimates will be released in conjunction with the PEA.
Srikant Annavarapu of Stantec Inc. is the Qualified Person with respect to this press release and has approved the disclosure of the technical information contained herein.
Ucore Completes Underground Mine Design for Bokan Project
April 18, 2012 – Halifax, Nova Scotia – Ucore Rare Metals Inc (TSX-V:UCU) (OTCQX:UURAF) (“Ucore” or “the Company”) is pleased to announce the receipt of an underground Mine Design (“MD”) study of the Bokan Heavy Rare Earth project on Prince of Wales Island in Alaska, USA (the “Project”). The MD was completed by Stantec, of Tempe, AZ.
The objective of the study was to recommend the most advantageous mining methodology from a range of alternatives, and estimate the capital and operating costs for the underground mine. The MD is an important component of Preliminary Economic Assessment (“PEA”) for Bokan, due in the near term. The responsibility for the overall PEA rests with Wardrop, A Tetra Tech Company (“Tetra Tech”).
The MD report recommends an appropriate mining methodology based on resource geometry and geotechnical considerations. Additional aspects of the study include the preparation of a conceptual mine plan and the estimation of the mine production rate and production schedule. The full Bokan MD report will be released on conjunction with the PEA, due in the near term.
“As our Preliminary Economic Assessment moves to completion, this underground mining study is an important component of logistical analysis”, said Jim McKenzie, President & CEO of Ucore. “The report affirms the mining potential at Bokan, and offers insight into the comprehensive PEA which is pending in the near term. The study sets out a crown pillar where the mineralisation outcrops at surface, resulting in a daylight expression that yields minimal environmental disturbance. The report also affirms that high grade content can be accessed close to mine mouth, with a prospective positive effect on initial construction cost and turnaround.”
“Further, the prospective minable resource size has been increased by 44% over prior estimates (from 3.7 million tonnes to 5.3 million tonnes)”, continued McKenzie, “due to a reduction of cutoff grade. The expected daily production rate for Bokan has also been increased by 50% over previous interim estimates (from 1000 to 1500 tpd), with a potentially material impact on rate of return. Our thanks to the engineering team that delivered this analysis on time and within budget.”
The MD report was based on the inferred mineral resource block model provided by Aurora Geosciences (Alaska) Ltd. and released by Ucore in March of 2011. After a review of the block model inventory at various TREO % cutoff grades, it was determined that 0.4% TREO would be utilized as an economic cutoff for the mine design. At this cut-off, the resource consists of 5.3 million tonnes of mineralization at an average grade of 0.65% TREO, of which 40% are HREO.
Based on a review of the geometry of the mineralized body, Stantec determined that blasthole stoping is the most appropriate mining methodology for the project. Blasthole stoping is a very productive and efficient underground mining method and is based on a designed mine production rate of 1500 tpd. The resultant production schedule forecasts 540,000 tonnes per annum. The MD report suggests the use of mill tailings as paste backfill to fill the mined out areas of the underground. This technique promises to minimize the need to store tailings in a management facility at surface.
The total required operating manpower of the underground mine is estimated at 118 persons, including mine administrative personnel. Mine personnel calculations are based solely on the underground portion of the mine, and are exclusive of personnel required for subsequent administration, surface operations and processing. Detailed capital and operating cost estimates will be released in conjunction with the PEA.
Srikant Annavarapu of Stantec Inc. is the Qualified Person with respect to this press release and has approved the disclosure of the technical information contained herein.
Antwort auf Beitrag Nr.: 43.044.749 von Langstrumpf2 am 16.04.12 16:39:38das liest sich schon wesentlich besser als bei Stans,...
Here is a response from Mark McDonald:
Nice to hear from you again.
We are expecting to release the mine scoping study, the metallurgy flowsheet and then the PEA in that order. In the Herald article by John Demont he mentions that the PEA was expected in 'the coming months'. The Demont article was written after a long and detailed discussion with Jim McKenzie and myself pertaining mostly to macro economic issues around the WTO complaint about Chinese REE export policy.
The very specific timing of these releases is difficult to forecast. That being said as per our communications this year we are targeting April to have these individual reports, from our partners, completed. Since the 'mine scoping' and metallurgy reports feed the PEA they will precede that release. The reports are complex and need to be distilled for the public and specifically our investors. Press releases authored by our administration team are then reviewed by our technical team and approved by the executive and importantly, an independent 'Qualified Person'. This process is sometimes protracted.
We are very pleased with the quality of these reports so far. The Mine Scoping Study by Stantec Engineering is complete and we are currently finishing the final technical reviews so that we can release its conclusions very soon. The management team are impatient as are most investors that I deal with. Notwithstanding we can not afford to rush these releases as they include vital information that will be studied very closely. Our investors and partners have come to expect a high level of quality across our communications suite including our press releases, newspaper and magazine articles, website, social media, apps, corporate presentations and the Ucore TV videos that we release regularly. We will not sacrifice quality for timing.
John Demont understands the nature of the business and may have given us more elbow room than we need to deliver the expected releases.
We at Ucore in partnership with Knight Piesold, Hazen Research, Stantec Engineering, Lintek Engineering, Wardrop (TetraTec) Engineering, Aurora Geosciences and Acculabs under the direction of Ken Collison are working diligently to get the above mentioned partner generated reports delivered this month and the information released to the public forthwith.
Best regards,
Mark
Nice to hear from you again.
We are expecting to release the mine scoping study, the metallurgy flowsheet and then the PEA in that order. In the Herald article by John Demont he mentions that the PEA was expected in 'the coming months'. The Demont article was written after a long and detailed discussion with Jim McKenzie and myself pertaining mostly to macro economic issues around the WTO complaint about Chinese REE export policy.
The very specific timing of these releases is difficult to forecast. That being said as per our communications this year we are targeting April to have these individual reports, from our partners, completed. Since the 'mine scoping' and metallurgy reports feed the PEA they will precede that release. The reports are complex and need to be distilled for the public and specifically our investors. Press releases authored by our administration team are then reviewed by our technical team and approved by the executive and importantly, an independent 'Qualified Person'. This process is sometimes protracted.
We are very pleased with the quality of these reports so far. The Mine Scoping Study by Stantec Engineering is complete and we are currently finishing the final technical reviews so that we can release its conclusions very soon. The management team are impatient as are most investors that I deal with. Notwithstanding we can not afford to rush these releases as they include vital information that will be studied very closely. Our investors and partners have come to expect a high level of quality across our communications suite including our press releases, newspaper and magazine articles, website, social media, apps, corporate presentations and the Ucore TV videos that we release regularly. We will not sacrifice quality for timing.
John Demont understands the nature of the business and may have given us more elbow room than we need to deliver the expected releases.
We at Ucore in partnership with Knight Piesold, Hazen Research, Stantec Engineering, Lintek Engineering, Wardrop (TetraTec) Engineering, Aurora Geosciences and Acculabs under the direction of Ken Collison are working diligently to get the above mentioned partner generated reports delivered this month and the information released to the public forthwith.
Best regards,
Mark
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