XXI. Types of Sampling Flashcards
a specimen is picked up from a portion of mineralized outcrop/ore body. The samples are taken and analyzed to obtain a preliminary idea about the nature and grade of whole deposit and to know appreciate metal content
Grab Sampling
suitable method for bedded, banded and vein type of deposits, this method consist of cutting channels across the face of exposed ore and collecting resulting chips, fragments and dust from each channels to make a sample
Channel/Groove/Trench Sampling
used for hard or uniform ores where it is difficult to cut channels; the samples are collected by taking a small series of chips of rocks on a regular grid pattern from the working face in regular intervals; The blasted, broken material are sampled. The shape of grid is adopted to the morphology and structure of deposit. The main advantage of this sampling is its high productivity.
Chip or Point Sampling
Involves cutting of pieces of ore and rock from exposed faces
of ore and waste. The faces may be natural outcrops or faces exposed in surface trenches and pits or in the backs, walls, and floors of development openings and stopes.
Face or Muck or Lump Sampling
This type of sampling method is used in checking of the reliability of other types of samples and sometimes may be taken to determine a correction factor for use in an estimate
based on samples of other types.
Bulk Sampling
The samples are taken by blasting down drift blocks or a section in a stope or otherwise obtaining a sample of several tons to several hundred or even thousands of tons, either from trench, pit, channel or from the run-of-mine, where the entire lot is milled separately.
Bulk Sampling
Collection and analysis of silt, sand, mud, clay in a stream or river bed, either dry or wet.
Stream Sediment Sampling
This method is more convenient for the determination of the deposit’s boundaries. Here, samples consists of the cuttings from drill holes.
Drill Hole Sampling
There are mainly two types of sampling errors:
Random and Systematic errors
