Sampling Methods

1. CHIP SAMPLING

This method is used to take samples from an outcrop. The tools are used hammer and chisel. Samples taken at the surface fresh and clean. This method is used only in a preliminary investigation. The results are unrepresentative of the actual state of mineralization.

Chip sampling in underground mines:


 Samples taken at points that are designed according to specific patterns of exploration. See pictures a) and b).

On a) the pattern used - square

b) the pattern of use - rhomboid

2. GRAB SAMPLING

This method can be used on a stope after blasting at a mine car or in the transportation of ore. This work faster than chip sampling. Samples taken at random. This method also does not provide a thorough overview that can represent the existing ore deposits.

3. BULK SAMPLING

In bulk sampling, samples are taken in large quantities. Drill core samples may be large, or a certain amount of material taken from the trench by using a bulldozer.

4. CHANNEL SAMPLING

This method can be used in the sediment contained in the surface and also in an underground mine. For shallow sediments, this method is used in a test well. Groove (channel) is made on the side of the test wells. At a hydrothermal sediment mined by underground mining systems, channels made ​​from hanging wall to foot wall.

Application of existing methods must be accompanied by an appropriate design. Some examples of chip sampling and channel sampling in the field application are as follows:

4.a Channel sampling in test wells

Used for the sediment surface.



In Figure a well test is made to penetrate ore body that has positioned horizontally.

Image b) Position channel which vertical on wall of test wells.

To a precipitate surface who not homogeneous, then the channel is divided into several sub channels in accordance the condition of mineralization.



  Description: t = thick layer

K = grade ore

4.b. Channel sampling in underground mines

Channel sampling in the drift.

Channel divided by the complex geometry of the drift top. State homogeneous mineralization.




















Channel divided by the state of mineralization varying between A, B, C.


 















5. DRILLING

Drilling methods that can be used in the process of taking samples depends on a variety of factors, among others:

- Genesis sediment

- depth

- The type of rock

For alluvial deposits, withdrawals can be done with a drill samples Bangka (alluvial tin in Bangka, Billiton, and Singkep). Drilling is done manually and the sample is taken using the bailer.

For a primary precipitate that lies deep beneath the surface, the sampling is done by means of core drilling (diamond drilling). Sample obtained form the core (core) and sludge. Core as undisturbed samples contained in the core barrel; sludge collected at the surface in the sludge tank.

6. PREPARATION AND PROCESSING DATA CONTO

Samples were taken from the field in large numbers need to be processed in order of chemical analysis for the determination of levels.

The things you need to do is crushing, grinding, sieving, coning and quartering.























Coning and quartering

Part 1 and 4 were taken for chemical analysis, while sections 2 and 3 are stored as archives.

Chemical analysis data is then plotted on a graph (histogram sample). Sample histogram is very useful for the interpretation of mineralization in the ground state.





Graph deployment levels
 

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