(PDF) Ore Grade Reconciliation Techniques -A Review

The use of reconciliation factors (mine call . factors). 5.1. Depletion by Mining . The availability of grade control and produ ction data . from a definable part of the o rebody makes it possible ...

Mastering the Mineral Matrix: MRM's Blueprint for Mining …

Mine Call Factor Development: Illuminating Operational Efficiency. The concept of Mine Call Factor (MCF) emerges as a critical metric within MRM, reflecting the efficiency of mineral recovery and ...

Reporting information

Mine Call Factor : The ratio expressed as a percentage which the specific product accounted for in "recovery plus residue" bears to the corresponding product "called for" by the mine's measuring and evaluation methods. Mineral Reserve (Reserve) The economically mineable material derived from a measured and/or indicated Mineral ...

Variable components of the Mine Call Factor from a …

1.1 Mine Call Factor and its significance The Institute of mine surveyors of South Africa, defines the MCF as the ratio, expressed as a percentage, which the specific product …

The Mine Call Factor

The theory of the Mine Call Factor (MCF) is well-known but not yet fully understood. The definition implies that if the process of sampling, assaying, tonnage measurements in a mine and plant are ...

(PDF) Monitoring ore loss and dilution for mine-to-mill …

The purpose of this study is to understand how ore loss and dilution affect the mine call factor, with the aim of subsequently improving the quality of ore mined and fed to the mill. It was ...

The Mine Call Factor---conditional bias at its worst

This poster presentation will illustrate the problems of declining Mine Call Factors (MCFs) particularly in the Wits gold mines. The significant increase in "gold losses" in many mines over the last few years can often be explained by updating the "regression corrections" first introduced by krige in the 1950s. The regression effect (or conditional bias) is a well …

Review of gold reef sampling and its impact on the mine call factor

Sampling practice and its impact on the mine call factor on Witwatersrand gold mines: lessons learned. Journal of the Institute of Mine Surveyors of South Africa, vol. XXXI, no. 7. pp. 202-216. ...

The tracking of metal content on a surface mine: A digital …

Mine call factor theory. Storrar (1981) defined MCF as a fraction (expressed as a percentage) of the specific product accounted for in recovery plus residue, to the …

Monitoring ore loss and dilution ... preview & related info

The study revealed that fragmentation, underground accumulation of ore, and dilution have a significant influence on the mine call factor and mine output. It was difficult to quantify the total ore loss due to the time lag between mining and milling, which is extremely variable, when estimating the mine process inventory.

Review of gold reef sampling and its impact on …

Keywords: sampling, error, bias, mine call factor. Introduction. Two types of 'sampling' are distinguished, namely sampling of particulate materials (broken ores) and sampling of solid, unbroken in situ mineralized reef. …

Standardising the Reconciliation Factors Required in

For example the 'mine call factor' is commonly defined as the variance between the estimation of what grade control predicted would be sent to the mill against

Reconciliation along the mining value chain

An example of such an analysis, based on the data in Figure 4, is illustrated in Figure 5, which shows the 90% confidence limits on the variability of the mine call factor. The example chosen illustrates an extreme case, which is actually a diamond operation. Assess mass measurement

INVESTIGATION OF THE FACTORS THAT INFLUENCE …

The Mine Call Factor (MCF) will be in a perfect mining environment. This is when no gold loss occurs throughout the mining process from the in situ gold blasted on the stope face through to the processing plant and the estimation of the gold produced (called for) is perfect. Ya Rona shaft, part of the Driefontein Operation, showed a downward

Monitoring ore loss and dilution for mine-to-mill integration …

The purpose of this study is to understand how ore loss and dilution affect the mine call factor, with the aim of subsequently improving the quality of ore mined and fed to the mill. It was necessary to know the relationship between ore mined and delivered for processing in order for the mine to operate efficiently. A review of the literature ...

Mine call factor issues at Iduapriem mine: working towards …

The theory of Mine Call Factor (MCF) compares the sum of metal produced in recovery plus residue to the metal called for by the mines evaluation method expressed as a percentage. This MCF concept is well known in underground scenarios and therefore this report highlights the MCF issues and the variable components affecting it from a surface …

[PDF] The analysis of the mine call factor in gold mining, with

The ultimate gold mining efficiency is the Mine Call Factor (MCF). It is the ratio, expressed as a percentage, which is the specific product accounted for in recovery plus residues …

Review of gold reef sampling and its impact on …

Gold mining efficiency is measured by the Mine Call Factor (MCF) a ratio, expressed as a percentage, of the gold 'accounted for' divided by the gold 'called for' by the mine's measuring methods. The 'unaccounted for' gold …

Implementing an Ore Reconciliation System Supported …

Within the mining industry it is a common practice to use the above information to produce factors, sometimes known as Mine Call Factors (MCF). These factors are used to evaluate the performance of the long range model, short range model, grade control model, and dilution and ore losses that occur from mining. These factors …

Monitoring ore loss and dilution for mine-to-mill integration …

Sibanye Gold, Welkom, South Africa. SYNOPSIS. The purpose of this study is to understand how ore loss and dilution affect the mine call factor, with the aim of …

The tracking of metal content on a surface mine: A digital mining …

2. Mine call factor theory. Storrar (1981) defined MCF as a fraction (expressed as a percentage) of the specific product accounted for in recovery plus residue, to the corresponding product called for by the mine's measuring method. The mathematical expression is: M C F = m e t a l p r o d u c e d i n r e c o v e r y p l u s r e s i d u e m e t a …

Poor sampling, grade distribution, and financial …

In South Africa the way in which sampling of in situ gold-bearing reefs affects the mine call factor has been an ongoing study since the disparity between the estimation of gold in the reef and the actual gold bullion …

Investigation of the factors that influence the mine call factor …

The Mine Call Factor (MCF) will be in a perfect mining environment. This is when no gold loss occurs throughout the mining process from the in situ gold blasted on the stope face through to the processing plant and the estimation of the gold produced (called for) is perfect. Ya Rona shaft, part of the Driefontein Operation, showed a downward trend in …

FREDDIES MINE MINE CALL FACTOR

MINE CALL FACTOR -f- 6T0Pt£ GRADE (g/t) GRADE (g/t) Author De Jager E J Name of thesis The analysis of the mine call factor in gold mining with specific reference to Western Holdings Mine 1997 PUBLISHER: University of the Witwatersrand, Johannesburg ©2013 LEGAL NOTICES:

The mine planning process for an open-pit diamond mining …

Mining dilution and mining recovery factors are applied in Whittle to develop an appropriate mine call factor for converting a geological block model into a mining model. Mining dilution refers to the proportion of waste that is taken to the processing plant, while mining recovery refers to the ore not selectively mined but taken to waste ...

THE ANALYSIS OF THE MINE CALL FACTOR IN GOLD …

highest Mine Call Factor was 93 percent while the low^-t to date, 58 percent, occurred in April 1995

QUANTIFICATION OF PLATINUM GROUP METAL …

The Mine Call Factor reports the discrepancy between metals called for and metals accounted for and this includes the losses associated with fines produced during blasting. Over a period of time metal accounting of the ore flow stream and grade comparison along the route should verify where the losses occur and the extent ...