SIST ISO 6139:2000 PDF

Name: SIST ISO 6139:2000 — Aluminium ores -- Experimental determination of the heterogeneity of distribution of a lot
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Aluminium ores -- Experimental determination of the heterogeneity of distribution of a lot

Название (английский):

SIST ISO 6139:2000

Aluminium ores -- Experimental determination of the heterogeneity of distribution of a lot

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 1 июня 2000 г.
ICS:: 73.060.40
Технический комитет:: IRUD - Mining

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Описание (английский):

The heterogeneity of distribution is characterized by the distribution variance and is determined by experimentally measuring the sampling variance. Because both the composition variance and distribution variance contribute to the measured sampling variance, it is necessary to separate these two components. Two methods of data analysis are permitted: Visman's theory of sampling which uses classical statistics and the variogram method which gives a better estimate because of taking into account serial correlation between adjacent increments.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 6139:1993 - "Aluminium ores - Experimental determination of the heterogeneity of distribution of a lot" specifies experimental procedures to quantify how aluminium ore is spatially distributed within a lot. The standard defines the distribution variance (heterogeneity of distribution) and prescribes how to separate it from composition variance by measuring sampling variance at two increment masses. It supports sound design of sampling schemes and determination of the minimum number and mass of primary increments.

Key topics and requirements

Objective: Evaluate heterogeneity of distribution to determine the minimum number of primary increments and an effective sampling scheme.

Data collection:

Determine the minimum increment mass per ISO 8685.
Collect a minimum of 30 increments (preferably at the intended sampling interval).
Analyze each increment separately.
Repeat with a substantially larger increment mass (e.g., increase by a factor of 10).

Variance components: The measured sampling variance includes both composition variance and distribution variance. The standard requires subtracting sample preparation and analysis variance (per ISO 10277) from measured variances.

Permitted analysis methods:

Visman’s theory of sampling (classical statistics): Produces conservative estimates of sampling and distribution variances.
Variogram method: Accounts for serial correlation between adjacent increments and their spacing, giving a more realistic estimate and better basis for optimizing sampling schemes.

Calculations: From two increment-mass datasets, derive composition variance and distribution variance; then compute sampling variance for any increment mass and estimate the number of increments needed to achieve a target sampling error.

Practical recommendations: Compute corrected experimental variograms for lags (recommended t = 1 to 20), estimate intercept and slope, and use these to compute sampling variance for systematic sampling.

Applications and users

ISO 6139 is practical for:

Mining companies and sampling engineers designing ore-sampling programs for production and reserve estimation.

Quality assurance and control teams specifying sampling frequencies and increment masses.

Metallurgists, mineral statisticians, and consultants optimizing sampling strategy to meet required sampling error limits.

Laboratories and auditors validating sampling precision and variance partitioning.

Key outputs include distribution variance, recommended number of increments, and a validated sampling scheme minimizing sampling error for aluminium ores.

Related standards

ISO 8685:1992 - Aluminium ores - Sampling procedures.

ISO 10277 - Aluminium ores - Sample preparation and analysis; methods for checking precision of sampling.

Keywords: ISO 6139:1993, aluminium ores, heterogeneity of distribution, distribution variance, sampling variance, Visman’s theory, variogram method, sampling scheme, increment mass.

SIST ISO 6139:2000 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

Технические детали

ISO 6139:1993

Aluminium ores — Experimental determination of the heterogeneity of distribution of a lot

ISO 8685:1992

Aluminium ores — Sampling procedures

ISO 10277:1995

Aluminium ores — Experimental methods for checking the precision of sampling