Met Analysis

Identification

It make use of a particular property or class of

properties in order to different one from the other

Identification

It must depend on some fundamental characteristics which is always the same, independent of the mode of occurrence or the nature of the locality of the environment

Determination

The result of definitely ascertaining the position, nature, amount, etc. of any measurement, weighing, or counting.

Estimation

The result of approximately ascertaining numbers, quantities, magnitudes, etc. without actual enumeration, weighing, or measurement

Estimation

It uses limited means which are insufficient or unsuitable for producing accurate and reliable values

Estimation

For many purposes, it is sufficient but from its nature, it cannot be as positive as a determination

Sampling

It is the pre-requisite of effective analysis.

Sampling

The art of securing a small weight or fraction, that is representative of a relatively large mass or amount

Sampling

The operation of removing a part of the bulk material, so as to reduce quantity, with minimum alteration of all other characteristics

Definite Ratio

It must exist between the weight of the sample and the size of the ore particle

Sampling

It is a progressive process in which the original material is reduced in quantity to the final mass of sample convenient for analysis

Imperative

To reduce everything to smaller size and thorough mixing before taking the 1st cut for samples

Sampling

It is generally prone to a lot of errors

Perfect Sampling Technique

It is assumed to yield samples such that any deviation from complete representation of quality to be tested in the sample are ascribed to chance causes

Sampling

It works with a very large bulk of original material and numerous stages involved in the process

Theory of Probabilities

It can be said that reliable sampling technique is largely based on the?

Sampling Error

It is expressed as the overall sampling variance, is simply the sum of the variances obtained from the chosen increment mass and frequency.

Population

It is the total number of discrete units in a bulk (with distinct physical and chemical properties)

Parameter

It is numerical characteristics of the population

Statistics

selected samples which may be practically measured and examined and which give an estimate of the parameters of the whole universe or population

Arithmetic Mean

It measures the central tendency of a certain parameter.

Arithmetic Mean

It does not completely describe the distribution or spread of the parameter over the population.

Variance

It is the mean square deviation of the observed parameter from the mean.

Variance

It describes how possible values are spread around the expected value.

Confidence Intervals

It is the intervals within which the true mean has a certain probability of falling

Confidence Limits

It is the extreme values for these intervals

Tabulated Values

These are available from various confidence levels and sample sizes.

Continuous Automatic Sampling

It is preferable to manual sampling; intermittent manual sampling should be conducted in a random manner.

Manual Sampling

It is usually more expensive. Additionally, personal biases come into account

Grab Sampling

It is the simplest form of hand sampling. It also consists of taking small equal portions by scoop or shovel at random or at regular intervals.

Coning and Quartering

It is one of the oldest Hand Sampling methods. It is also the standard method used in US

Shovel Sampling

It is also known as Fractional Shoveling, or Fractional Selection. It is applied when ore is being loaded or unloaded, or when moved from one place to another by shovel

Trench Sampling

It consists of cutting trenches along a flattened cake of ore for the samples. The accuracy is dependent on the degree of mixing of the material

Pipe and Auger Sampling

It is the use of pipes with one sharpened end and handles in the other end.

Auger-shaped Pipes

It is used when material being sampled is packed hard.

Machine Sampling

Devices designed to substitute mechanical processes for the undesirable human element in hand sampling.

Stationary

It takes part of the stream all of the time

Moving

It takes all of the stream part of the time

Whistle-pipe Sampler

It is a vertical pipe with notched openings cut halfway through the pipe, each opening spaced 90 degrees horizontally from the preceding

Jones Riffle Sampler

Continuous diversion of ore using an even number of equally sized chutes, adjacent chutes discharging at opposite ends.

Vezin Sampler

Arc-type sampler which uses a rotating cone with two scoops to accommodate cuts through a stream

Snyder Sampler

Consists of a pan-shaped plate with one or more sample spouts for stream sample cuts from a feeding chute

Brunton Oscillating Sampler

It consists of a hopper which discharges ore through a chute to an oscillating deflector consisting of two reject-deflecting surfaces and a sample-deflecting surface separated by cutting edges

Umpire Sampler

It is used for cutting-down dry samples for assay. It consists of two counter-rotating buckets placed one over the other, each divided into 4 compartments with alternating openings