## SPI® - A Decade Later - SGS

The MinnovEX SAG Power Index (SPI ®) test is celebrating its 10th year of industry use as a primary source of ore data for grinding circuit design, optimisation, or production forecasting. While having enjoyed extensive use and commercial success world-wide there are a number of questions that are frequently encountered. Notable among these are: • Why use a small scale SAG

More## SAG Power Index (SPI) Test SGS

Conducted in a bench-scale comminution mill, the SPI test measures the energy needed to perform a standard size reduction and is expressed as an index. It is a measure of the hardness of the ore from a SAG or AG milling perspective.

More## SAG Power Index (SPI) Test SGS South Africa

Conducted in a bench-scale comminution mill, the SPI test measures the energy needed to perform a standard size reduction and is expressed as an index. It is a measure of the hardness of the ore from a SAG or AG milling perspective.

More## Orway Mineral Consultants Canada Ltd. Mississauga, ON ...

The SAG Power Index (SPI) test (Starkey Dobby, 1996) uses a benchscale SAG mill test to - determine the specific energy of an industrial SAG mill. The test is operated in closed circuit and the time required to grind the material to a P

More## SAG Power Index (SPI) Test SGS Angola

Mining SAG Power Index (SPI) Test. You can trust SGS to provide you with unparalleled global expertise in the field of grinding circuit design, optimization and production forecasting using tools such as the SAG Power Index (SPI®) test. Conducted in a bench-scale comminution mill, the SPI test measures the energy needed to perform a standard size reduction and is expressed as an index

More## SAG Power Index (SPI) Test SGS India

Mining SAG Power Index (SPI) Test. You can trust SGS to provide you with unparalleled global expertise in the field of grinding circuit design, optimisation and production forecasting using tools such as the SAG Power Index (SPI®) test. Conducted in a bench-scale comminution mill, the SPI test measures the energy needed to perform a standard size reduction and is expressed as an index

More## The application of the sag power index to ore body ...

The SAG Power Index test (SPI) is a tool for forecasting autogenous mill performance. Much effort has been directed towards the development of the process models relating SPI to throughput estimates, but little has been directed towards ore body modeling. Blending studies are presented showing that the SPI is not additive, affecting the geostatistical procedures. A

More## The SAG Power index also known as the Starkey SAG Test ...

The SAG Power index also known as the Starkey SAG Test, also known as the SAG Grindability Index Test - CEEC (Coalition for Eco Efficient Comminution)

More## DESIGN OF THE KUBAKA GRINDNG CIRCUIT USING SPI AND BOND

The SAG Power Index (SPI) Test was then co-developed by Starkey and Minnovex Technologies Inc. of Toronto into a commercially acceptable way to measure required SAG energy by benchmarking SAG and AG mills in a large number of plants.

More## Power-based comminution calculations using Ausgrind

• The SAG Power Index (SPI) test was developed by Starkey and Dobby (Starkey and Dobby, 1996) as the AG/SAG equivalent to the work index test.

More## MANAGING COMPANY RISK BY INCORPORATING THE MINE

Production planning on a block-by-block basis throughout the resource model was never attempted. The development of the MinnovEX SAG Power Index Test (SPI) in 1994 made production planning on a block-by-block basis possible. The development of the CEET program made it a reality. The SPI test was based on using

More## GEOMETALLURGY APPLIED IN COMMINUTION TO MINIMIZE DESIGN RISKS

80thpercentile value of a key measure, such as the JK drop weight test Axb parameter (Napier-Munn el.al., 2005), the SMC Test®drop weight test index (DWI) (Morrell, 2004), the SAG power index (SPI®) (Starkey Dobby, 1996) and Bond ball mill

More## A Method of Calculating Autogenous/ Semi-Autogenous ...

Barratt (1989) described a method using Bond Indices than adding a single factor of 1.25 to arrive at the AG/SAG specific energy. In 1991 the Canadians developed the SAG Power Index (SPI), test using 2 kg of material in a 300 mm diameter mill. This test has been further developed by Starkey, Hindstrom and Orser (2006).

More## Index Laws Teaching Resources

23/08/2012 PPT covering most of the index laws up to and including negative indices. Was designed as an introduction to index laws for my year 9s. Read more. Free. Loading... Save for later. Preview and details Files included (4) pptx, 257 KB. Index Laws. pptx, 61 KB. Indices HL. fjsw, 14 KB. indices. Show all files. About this resource . Info. Created: Aug 23, 2012.

More## Rock Quality Designation (RQD) SGS

SAG Power Index (SPI) Test; Static Pressure Test (SPT) Triaxial and Uniaxial Tests; Back To Metallurgy and Process Design. Contact Us Send a Message. Get in Touch. SGS Headquarters 1 Place des Alpes P.O. Box 2152 1211 Geneva 1 Switzerland; t +41 22 739 91 11 ; SGS Offices Labs More locations. News. 29 September 2020. New Hybrid Geochemistry Lab Opens in

More## Minerals Engineering International Online - Comminution ...

He was instrumental in developing the SAG Power Index or SPI test, which has proven to be a reliable and relatively low cost tool that can be used to predict mill power, throughput and fineness of grind. He contributed the to the advancement of grinding technology through his work with MinnovEX from 1994 until 2001. John initiated the concept of using a small SAG mill for

More## SAG Power Index (SPI) Test SGS Australia

Mining SAG Power Index (SPI) Test. You can trust SGS to provide you with unparalleled global expertise in the field of grinding circuit design, optimisation and production forecasting using tools such as the SAG Power Index (SPI®) test. Conducted in a bench-scale comminution mill, the SPI test measures the energy needed to perform a standard size reduction and is expressed as an index. It is ...

More## The SAG Power index also known as the Starkey SAG Test ...

The SAG Power index also known as the Starkey SAG Test, also known as the SAG Grindability Index Test . Procemin 2013 In this paper, the authors undertake a critical review of the Starkey test and the publicly available infor- mation related to the test equipment, procedures, and scale-up methodology. The following recommendations are proposed to improve the test method: The test should be ...

More## MANAGING COMPANY RISK BY INCORPORATING THE MINE

The development of the MinnovEX SAG Power Index Test (SPI) in 1994 made production planning on a block-by-block basis possible. The development of the CEET program made it a reality. The SPI test was based on using . smaller but more frequent samples in order to better understand the power requirements within and across ore types for SAG milling (1). With SPI testing, a profile of ore

More## A Method of Calculating Autogenous/ Semi-Autogenous ...

In 1991 the Canadians developed the SAG Power Index (SPI), test using 2 kg of material in a 300 mm diameter mill. This test has been further developed by Starkey, Hindstrom and Orser(2006). This test now includes a Bond Ball mill work index test. The Macpherson test is still being offered by some testing facilities. This dry test requires at least 180 kg of material. Morrell (2004) formulated ...

More## SINGLE STAGE SAG/AG MILLING DESIGN

SPI or SAGDesign tests. Regardless of the test used each sample should be twinned with a Bond Ball Work Index or equivalent test to also define the low energy breakage characteristics. Piloting can be undertaken to confirm the circuit design derived from the initial design process. This tends to be the case for large projects where the reduction in the design contingency can result in ...

More## TESTWORK PROGRAMS THAT DELIVER MULTIPLE DATA SETS

Test Series Test Drill Core Composite Interval Desired Sample Weight Generic Resource Assay 1.5 m ¼ core over 1.5 metres Ai 45+ m 5 kg Point Load Index not applicable nil Flotation test charge 15 m 2 kg (several) Bond WiC 45+ m 20 kg WiRM 45+ m 15 kg WiBM 45+ m 10 kg JK SMC 15 m 20 kg DWT not applicable 100 kg Minnovex SPI CI 30 m (15 m × 2 ...

More## Minerals Engineering International Online - Comminution ...

He was instrumental in developing the SAG Power Index or SPI test, which has proven to be a reliable and relatively low cost tool that can be used to predict mill power, throughput and fineness of grind. He contributed the to the advancement of grinding technology through his work with MinnovEX from 1994 until 2001. John initiated the concept of using a small SAG mill for testing on drill core ...

More## Mineral processing design and operations : an introduction ...

Covers the theory and formulae for unit capacities and power requirements to help the designer develop the necessary equipment and flow-sheets to economically attain maximum yield and grade. This second edition describes theories and practices of design and operation of apparatus and equipment, including an additional chapter on magnetic, electrostatic, and conductivity modes of mineral ...

More## Sag in transmission lines electricaleasy

Keeping the desired sag in overhead power lines is an important consideration. If the amount of sag is very low, the conductor is exposed to a higher mechanical tension which may break the conductor. Whereas, if the amount of sag is very high, the conductor may swing at higher amplitudes due to the wind and may contact with alongside conductors. Lower sag means tight conductor and higher ...

More## TECHNICAL NOTES 8 GRINDING R. P. King

LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the conical ends. ! c is the specific gravity of the ...

More## GEOMETALLURGY APPLIED IN COMMINUTION TO MINIMIZE DESIGN RISKS

2005), the SMC Test® drop weight test index (DWI) (Morrell, 2004), the SAG power index (SPI ®) ... milling power draw, the rock quality data (RQD ) and a function relating copper grade and drop weight index (DWI), and work index independently of ore domains. Freeport-McMoRan’s project Amelunxen et al. (2011) The trade-off economics of SAG mill and HPGR-based circuits were primarily ...

More## TESTWORK PROGRAMS THAT DELIVER MULTIPLE DATA SETS

Test Series Test Drill Core Composite Interval Desired Sample Weight Generic Resource Assay 1.5 m ¼ core over 1.5 metres Ai 45+ m 5 kg Point Load Index not applicable nil Flotation test charge 15 m 2 kg (several) Bond WiC 45+ m 20 kg WiRM 45+ m 15 kg WiBM 45+ m 10 kg JK SMC 15 m 20 kg DWT not applicable 100 kg Minnovex SPI CI 30 m (15 m × 2 ...

More## Knee examination - SlideShare

14/08/2017 Lachman test: Method: - More sensitive than drawer test - knee flexed at 20 degrees - with one hand grasping the lower thigh and the other the upper part of the leg - the joint surfaces are shifted backwards and forwards upon each other - Finding : If the knee is stable, there should be no gliding. Fig : Lachman test 22Knee Examination/ Sunil Baniya

More## Standardized Precipitation Evapotranspiration Index (SPEI ...

18/07/2015 The Standardized Precipitation Evapotranspiration Index (SPEI) is an extension of the widely used Standardized Precipitation Index (SPI). The SPEI is designed to take into account both precipitation and potential evapotranspiration (PET) in determining drought. Thus, unlike the SPI, the SPEI captures the main impact of increased temperatures on water demand. Like the SPI, the SPEI

More## What Can Go Wrong in Comminution Circuit Design?

• the Starkey Test, then the SPI Test (Starkey and Dobby, 1996); and • SAG Mill Design Test (Starkey, 2006). There are reasonable correlations between all the tests’ data that generally ...

More## TECHNICAL NOTES 8 GRINDING R. P. King

LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the conical ends. ! c is the specific gravity of the ...

More## Home SPI Health and Safety

SPI Health and Safety offers a wide range of training programs in the following areas of expertise: respiratory protection, confined space, machine safety, electrical safety, lockout, industrial hygiene, fall protection and prevention management.

More## Arduino Yun / SPI Problem / Power Measuring CS5463 - Page 3

11/03/2017 Arduino Yun / SPI Problem / Power Measuring CS5463 - Page 3. Arduino Forum > Products > Arduino Yún > Arduino Yun / SPI ... INTERVALO_TENSAO_SAG = 6, //tempo em que a tensão deve se manter baixa para ativar a detecção de falha de tensão NIVEL_TENSAO_SAG = 7, //valor mínimo de tensão para ativar a detecção de falha de tensão INTERVALO_CORRENTE_SAG

More## DisPulverizer Analysis - Test Item Analysis

Index Content About DisPulverizer Analysis. 17/12/2013 7 Comments DisPulverizer analysis is an extension of item analysis, using techniques that are similar to item difficulty and item discrimination. In disPulverizer analysis, however, we are no longer interested in how test takers select the correct answer, but how the distracters were able to function effectively by drawing the test takers away from ...

More## Ryzen 5600x on B450 MSI Global English Forum - Index

06/01/2021 Please post any questions you may have regarding the BIOS differences etc and ill answer or test whatever I can for you. Reactions: evaldasdeleka159602e1 and eqwebbie_with_PC. D. drhexukhere Active member. PRIVATE E-2. Joined Jul 16, 2020 Messages 275. Dec 26, 2020 #2 BIOS Images with old 1600af CPU, Notice no AMD Overclocking menu. I thought it was missing from the

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